Century Ac Motor Serial Number Lookup

A Century part number consists only of digits and is in the form of“x-xxxxxx-xx”. Extract the middle six digits from that part number and enter it into our search engine for an exact result. A motor model number of any of these varieties can be entered into INYO's product search engine and an exact match can be found. Century O.S.E Switch End Bell 203 Bearing: SCN-509: SCN-509: Century O/S Terminal Board Cover: SCN-515: SCN-515: Century Rotating Switch Single Speed: SCN-435-36: SCN-435-36: Century Shaft End Bell Round Body 304 Bearing: SCN-510: SCN-510: Generic Motor Thru Bolts 10-32 x 12' Long x 2' Thread: 16285680: 35-125-2097: Generic Motor Thru.

  1. Century Ac Motor Serial Number Lookup
  2. Rheem Ac Serial Number Lookup
  3. Century Ac Motor Serial Number Lookup 1-800
  4. Trane Ac Serial Number Lookup

I.D. Letters.

With apologies for the poor quality, we have reproduced this list directly from the original manuals. As this is an important source of information we hope you find it useful. As an added feature I have retyped a table supplied by Ian Talmage, based on the original info, I hope it might be easier to read and maybe have extra info available. When I am satisfied all my gremlins are out of it and I have added as much as I can, I might delete the first one, but at the moment I leave both, as the first one came direct from the horses mouth, so to speak, British Seagull.

Scan right down to the bottom of the page for the latest edition. I think these tables are about as correct as I can get them, I will remove the originals at some time, when I'm sure!

John SOS

In 1980 Electronic ignitions were installed, engines having the E prefix from that date.

In the numbers below, for early years, some of the numbers do not appear to make sense. For instance in 1933 the numbers appear to run backwards, or should 300 be 800?

In 1934 the Super model OF the use of a ')' symbol appears. As I have seen this motor and it has the number 'O' instead, it looks as if a typist simply pressed the ')' instead of the '0', by hitting shift at the same time. The use of the number '0' in all the previous models tends to bear this out. There may well be other typo's in these numbers, but they are as good as it gets folks!

I have just had a little snippet from Charles Palfreeman in Poole. his research has added another letter to a few of the motors. August 06.

The FVP and FV motors had the factory option for a while, of a lifting or pivoting tiller. the engine was suffixed with a 'T' and a bent bracket fixed to the crankcase, to pivot the tiller on. the for runner to the casting! Well Found Charles. I have checked and yes, the two I have confirm it!

The Little Forty models. There is the model LM missing from the letter codes, fore runner to the SJM I believe. See the Little Forty's page for more. March 2007, I have had it confirmed that the 'F' did exist, I have seen one, thanks to Mike Williams for showing it to me!

The use of the letter 'W' in the dating codes.

For a long time I suspected it was not a 'W' but in fact an inverted 'M', and yes I have seen a few, but new light has dawned, from Frank Arnold. It seems they did in the early 1970's fit a number of 102's with 'Wipac' ignitions and they had the letter 'W' added with the year.. they did not do it for long as it was not a very useful exercise, after all you could see the darn thing had a wipac if you looked at it and you did not know what month it was built.. I have found several of these now and had a dozen or more reported to me, but recently I turned up another upside down 'M' so you have to look carefuly!

The Marston Seagulls start here:-

Below the letters and numbers for the Little Forty models. the 'F' was used, have seen one now and also there was an 'LM'.

Below is the updated list.

My grateful thanks to Ian for the time taken in sorting this out and donating it to the site for all to read.

John SOS

Engine - Letter Code - for Month/Year Manufactured

Model Identification - Month & Year Defined

From 1963 a letter and number code is used at the end of the engine number to denote the month and year of manufacture.

The letter indicates the month and the number the year of manufacture, i.e. A3 = January 1963, B3 = February 1963, etc., and M3 = December 1963 (the letter L is not used in this code sequence).

From 1973 two letters were used in the code to indicate the month, i.e. AA3 = January 1973, BB3 = February 1973, and MM3 = December 1973. Therefore identification of a model and date of manufacture can be found as follows: WSPCL 1734 BB3.

WSPCL indicates this is a long shaft Silver Century Plus. 1734 is the production number and BB3 indicates that it was manufactured in February 1973.

1963 to 19721973 to 1982
LetterMonthLetterMonth
AJanuaryAAJanuary
BFebruaryBBFebruary
CMarchCCMarch
DAprilDDApril
EMayEEMay
FJuneFFJune
GJulyGGJuly
HAugustHHAugust
JSeptemberJJSeptember
KOctoberKKOctober
MNovemberMMNovember
NDecemberNNDecember

The above table is still not 100% as the letters N were not used every year, December being M, so one can assume another letter was used somewhere. As it was not supposed to be 'L', that only leaves 'I'. However I have never seen one stamped with 'I' or 'II', looks too much like a numeral.. Need to look through a few hundred crankcases to figure this one out..

John

Model Identification - Letter Definitions

Some of the letters in the engine lettering code stand for different parts of the particular models. Below is a list of some of the letter meanings:

LetterMeaning
AAmal 400 series Carb
EElectronic Ignition Wipac Mk3 or 4
GBing Carb
LLong Shaft. This letter code was added after all the engine number pre ’63 and as a suffix to the code letters after ’63.
RReconditioned. used as a suffix. There is no record of when some engines were factory reconditioned, others seem to have the year code after the ‘R’
SSilver models/ Sealed Gearbox (90 grade Oil)
Wused on some motors as a suffix to denote Wipac ignition fitted. Notably 102 models
TTwist Grip fitted at factory. Could be retro-fitted on many models
TAs a suffix on the early FV and FVP for Tiller on bracket!

Engine - Letter Code - for Early Models, including the Marston Seagulls.

Year ManufacturedEngine Lettering CodeEngine No.Engine Size (cc) /NameSeries
1931OA178Standard
1933OA387/300?78Standard
1934OA800/868?78Standard
1934OA483/0/20078Standard
1934OE513/0/100178Hi Duty
1934OF511/0/50178Super: Neutral & Reverse
1935OA483/4/20078Standard
1935OE513/3/104778Hi Duty
1935OF511/3/50078Super: Neutral & Reverse
1935OG533/0/100102Super: Neutral & Reverse
1935OH534/0/101102High Power: Neutral & Reverse
1936OK552/0/101102Super: Neutral & Reverse
1933OBFew models made for Salmon Fisheries
1936OJ551/0/101102Short Water Jacket - Direct Drive
1937-41OP101102Short Water Jacket - Direct Drive
1937-41ON101102Short Water Jacket - Clutch Drive
1942SN1102Short Water Jacket - Clutch Drive
1942SNP1102Short Water Jacket - Direct Drive
1942-46SD102Short Water Jacket - Clutch Drive
1942-46SDP102Short Water Jacket - Direct Drive
1946HSD102 PlusShort Water Jacket - Clutch Drive
1946HC102 PlusLong Water Jacket - Clutch Drive
1946C102Long Water Jacket - Clutch Drive
1946D102Long Water Jacket - Direct Drive
1946-47AC102Long Water Jacket - Clutch Drive
1946AHC102 PlusLong Water Jacket - Clutch Drive
1946-47AD102Long Water Jacket - Direct Drive
ED102Direct Drive
EC102Direct Drive
EHC102 PlusClutch Drive

The question Marks mean the numbers either were missing or do not make sense. For instance the 1933 engine numbers seem to indicate just a few motors were made, or is the 3 really an 8? Which would make sense. However what happened to 1932? Lumped in with 1933 maybe? No one will tell me, no one seems to know. I hope shortly to get a definitive list of Early British Seagull Models, from the first Model 'A' to the first British Seagull 102's. I will create a special page just for the Marstons and transfer all the info on them to it. As far as we can gather, from the motors surviving, not many were indeed made, maybe as few as 1,000. John

The 1949 to 50's Model 'F' was doubted for a while, but in March 2007 I had pics of one sent in by Mike Williams. I was right not to doubt the British Seagull info! John

FORTY SERIES
Year ManufacturedEngine Lettering CodeEngine No
The ‘Little Forty’ Series
1949-50F100
1949-50VF1325
1950-51F1326
1950-51FV4342
1951-52FV4343
1951-52FVP8042
1952-53FVP8042
1952-53FV11364
1953-54FV11365
1953-54LS17828
T As a suffixOn the FV and FVP for 'Tiller on bracket'! (As opposed to fixed tiller on crankcase.) Well done Charles Palfreeman for researching this snippet.
The LM modelThis is missing from the tables? Not sure why it does not appear, but it appears to have run alongside the LS..
The later ‘Forty’ series and some ‘Little Forty models.
1954-55LS17829
1954-55LS27084
1955-56LS27085
1955-56LS35003
1955-56SJM10
1955-56SJP586L
1956-57LS35004
1956-57LS38324
(The LS was made till the end of 1957)(In my little collection I now have acquired SJP 1 from 1955 Awaits restoration!)
1956-57SJP587
1956-57SJM3903
1957-58LS38325
1957-58LS38344
1957-58SJM3904
1957-58SJP9772
1958-59SJP9773
1958-59SJP15997
1959-60SJP15998
1959-60SJP23561
1960-61SJP23562
1960-61SJP32604
1961-62SJP32605
1961-62SJM39823
1962-63SJP39824
1962-63SJP56054

Throughout the years above various codes were used during each year, ie F, FV, FVP, LM, LS, SJM, SJP. The years codes start with the first motor of whatever sort, that was made. Obviously the FV and FVP ceased in about 1953, the LS in !957. Strangely the LS and the SJP overlapped for 2 years. but then the 102 production went on till 1977, alongside the Centuries..

CENTURY SERIES
Year ManufacturedEngine Lettering CodeEngine No
1956-57LLS1200
1956-57LLS2410 L
1957-58LLS2411
1957-58LLS5933
1958-59CP5934
1958-59LLS9987
1959-60LLS9988
1959-60LLS14438 L
1960-61LLS14439
1960-61LLS22094
1961-62LLS22095 L
1961-62LLS29368
1962-63CP29369 L
1962-63CPC35548 L

Throughout the years above all the codes were used each year, ie LLS, CP, CPC. The years codes start with the first motor of whatever sort, that was made.

Somehow the following table became very confused. Ian has given me a template here in which to hang the numbers, but sadly mine were all muddled, I have redone this table several times. Hopefully it is now correct. The Model codes AC AD, TD, TC, etc, all seemed to run together. Whichever motor type was the first out of the factory in any year, is the code seen as the start number and code for the year. The numbers just keep on adding up as the years go by, till they were getting unwieldy, thus the introduction of the date system in 1963. Recently research by others has revealed all sorts of anomalies that I had wondered about. Seems British Seagulls made quite a lot of other motors that did not appear in the official lists. We are slowly getting more info on them, but of course it is conflicting.. John

102 SERIES
Year ManufacturedStarts with Eng No.Ends with Eng No.
1945-46SD11484 L SDP 12263
1946-47SDP12264AC694
1947-48AC695AC4000
1948-49AD4001AC8204
1949-50AD8205AD12866
1950-51AC12867AC20340
1951-52AHC20341AD26920
1952-53AD26921AD32585
1953-54AC32586AD37815
1954-55AD37816AC43350 L
1955-56AC43351 LAC49253
1956-57AC49254TD55203
1957-58TD55204TC60415
1958-59TC60416TC65216
1959-60TC65217THC71069 L
1960-61THC71070TD77178 L
1961-62TD77179 LTD81365
1962-63TD81366TD85043

(The Model 102 carried on in production till 1977 at least, I have proof that they were making 'one off batches' into the 1980's, with electronic ignitions! when I sort all those numbers, I will add them.) 'EDL'was one of the numbers found

Year ManufacturedEngine Lettering CodeModelSeries
1955-67SJMFortyMinus
1967-76FFortyFeatherweight
1977-78GFFortyFeatherweight/Bing Carb
1978-79FSFortyFeatherweight
1978-79GFSFortyFeatherweight/Bing Carb
1979-84EFSFortyFeatherweight/Model 45
1956-67SJPFortyPlus
1967-79FPFortyPlus Mark II
1976-79GFPFortyPlus Mark II
1978-79FPCFortyPlus clutch drive
1978-79GFPCFortyPlus clutch drive
Bing Carb
1979-89EFPCFortyPlus clutch drive/ Model 55
For a couple of years the G prefix denoted the Bing Carb, instead of the more normal Villiers, I have heard conflicting reasons for this, suffice to say they went back to Villiers till they replace it with the Amal 416, motors had an 'A' prefix then!
Year ManufacturedEngine Lettering CodeModelSeries
1956-67LLSCentury100
1967-73WCentury100
1957-67CPCenturyPlus fixed drive
1967-69WPCenturyPlus fixed drive
1959-67CPCCenturyPlus clutch drive
1967-73WPCCenturyPlus clutch drive
The Villiers Carb was used on all the models above. the same carb on 102 cc and 64cc, no difference? How that works no one has ever explained, but it does make it easier to swop carbs about! John
Year ManufacturedEngine Lettering CodeModelSeries
1966-69SSilver Century
1969-79WSSilver Century
1978-79WSCSilver Centuryclutch drive
1979-*ESCSilver Centuryclutch drive/ Model 75
1966-69SPSilver CenturyPlus fixed drive
1966-69SPCSilver CenturyPlus clutch drive
1969-79WSPCSilver CenturyPlus clutch drive
1979-*ESPCSilver CenturyPlus clutch drive/ Model 80/
1979-1996EFNRSilver Century Model 110/ Model 90
* Current production models (as of 1989?) Some of these models carried on till the early 1990's, the EFNR till the end in 1996.

The Amal 416 carb was used on some WSC and WSPC models, all ESC, ESPC and EFNR models. john

Year ManufacturedEngine Lettering CodeModelSeries
1946-56AC102clutch drive
1956-66TC102clutch drive
1967-73WC102clutch drive
1946-56AD102fixed drive
1956-67TD102fixed drive
1967-73WD102fixed drive
1946-56AHC102Plus - clutch standard
1956-67THC102Plus - clutch standard
1967-73WHC102Plus - clutch standard
The 102 used the Amal 2 jet carb exclusively. However, the replacement if it failed, in later years, was the 416, so some may have been changed. Strangely enough that carb will run reasonably happily on 10:1, which older, pre 1968, motors should run on. John
Year ManufacturedEngine Lettering CodeModelSeriesGear Oil
1983 to dateGEFFortyFeatherweight/Bing carbSAE140
AFFortyFeatherweight/Amal 416SAE140
EFFortyFeatherweight/Villiers carb ('E' for Electronic ignition, CD)SAE140
SEFFortyFeatherweight/sealed boxSAE140? 90 if box sealed
TSEFFortyFeatherweight/Twistgrip/sealed box.SAE140? 90 if box sealed
AFPWFortyPlus - direct drive/Amal 416SAE140
EFPWFortyPlus - direct drive/CD ign.SAE140
EFPCFortyPlus - clutch drive/CD ign.SAE 90
SEFPCFortyPlus - clutch drive/CD ign./sealed boxSAE 90
TSEFPCFortyPlus - clutch drive/ Twistgrip/CD ign/sealed boxSAE 90
ESC75CD ign/clutchSAE 90
ESCL75dittoSAE 90
EFNR90FNR box/CD ignSAE 90
EFNRL90dittoSAE 90
CSCurlewClutch/CD ign/sealed boxSAE 90
CLCurlewdittoSAE 90
CSTCurlewditto plus TwistgripSAE 90
CSTLCurlew dittoSAE 90
OSOsprey CD ign/FNRSAE 90
OLOsprey dittoSAE 90
OSROspreyditto/Roller bearing big endSAE 90
OLROspreyditto/roller bearing big endSAE 90
TOSOspreyCD ign/ FNR/TwistgripSAE 90
TOLOspreydittoSAE 90
KKingfisherCD ign/FNRSAE 90
KSKingfisherdittoSAE 90
KLKingfisherdittoSAE 90
KSRKingfisherCD ign FNR/Roller big endSAE 90
KLRKingfisherdittoSAE 90
TKSKingfisherTwistgrip/CD ign/FNRSAE 90
TKLKingfisherdittoSAE 90
Note a 'L' after the lettering part of the sequence denotes a long shaft model. 7 = 1987, 8 = 1988, 9 = 1989, 0 = 1990, 1 = 1991, etc.

Sealed box British Seagulls can be recognised by an extra screw in the gear box casing just above the top gearbox cap screw. This screw secures the bearing assembly.

Year ManufacturedEngine Lettering CodeModelSeriesHP*
1979-84EFSFortyFeatherweight/CD ign1-2
1984-85AFFortyFeatherweight/Amal carb/CD ign1-2
1985-89EFFortyFeatherweight/CD ign1-2
1989-90SEFFortyFeatherweight/Sealed box/CD ign1-2
1990-TSEFFortyFeatherweight/Twistgrip/CD ign/sealed box1-2
1983-84AFPWFortyPlus - direct drive/Amal carb/CD ign.2-3
1983-88EFPWFortyPlus - direct drive/CD ign2-3
1979-89EFPCFortyPlus - clutch drive/CD ign2-3
1989-90SEFPCFortyPlus - clutch drive/sealed box/CD ign2-3
1990-TSEFPCFortyPlus - clutch drive/Twistgrip/sealed box/CD ign2-3
1979-90ESC75Clutch/CD ign/sealed box4
1979-91EFNR90FNR/CD ign/sealed box5
1987-90CCurlewClutch/CD ign/sealed box4
1987-90CSCurlewditto4
1990-93TCSCurlewditto plus twistgrip4
1987-90OOspreyFNR/CD ign sealed box5
1987-90OSOspreyditto5
1990-92OSROspreyditto but roller big end5
1987-90KKingfisherFNR/CD ign sealed box6
1987-90KSKingfisherditto6
1990-93KSRKingfisherditto but roller big end6
1982-87EN170FNR/CD ign/Sealed box/weak big end!(Approx 7.5)
1984-86ENC125Clutch/CD ign/sealed box/weak big end!?
*HP represent the manufacturers HP model number. Since British Seagulls are rated in foot pounds the actual horse power rating may not be entirely accurate to the numbers listed. (33 foot pounds = 1 HP) Sealed box British Seagulls can be recognised by an extra screw in the gear box casing just above the top gearbox cap screw. This screw secures the bearing assembly. I have spent hours adding to this table, but if you can see one I have missed, please contact me! Note! The Hp ratings are very approximate! Later investigations proved they were wildly inaccurate, and the thrust at the prop became more important and was the figure used to denote models, ie the Featherweight become the 45, the EFNR the 90. John, SOS Note a 'L' after the lettering part of the sequence denotes a long shaft model. 7 = 1987, 8 = 1988, etc.

Below is a table featuring the Forty and Century models, with hp, approx and type of gearbox oil. this must be used with caution as there is no guarantee that your British Seagull has not been altered over the years..

Give away for the sealed gearboxes is an extra screw just above the cap screws, this secures the bevel bearing and seal.

Year ManufacturedEngine Lettering CodeModelSeriesHPIgnitionGear Oil
1955 to 1967SJMFortyMinus1-2Mk 1SAE 140
1967 to 1976FFortyFeatherweight1-2Mk 2SAE 140
1977 to 1978GFFortyFeatherweight1-2Mk 2SAE 140
1978 to 1979FSFortyFeatherweight1-2Mk 2SAE 90
1978 to 1979GFSFortyFeatherweight1-2Mk 2SAE 90
1979 to *EFSFortyFeatherweight1-2Mk 3SAE 90
1982 to 1984EGF451-2Mk 3SAE 90
1984 to 1985AF451-2Mk 3SAE 90
1985 to *EF451-2Mk 3SAE 90
1989 to 1990SEF451-2SAE 90
1990 to *TSEF451-2SAE 90
* Current production models (as of 1989?) Some of these models carried on till the early 1990's, the EFNR till the end in 1996.
Year ManufacturedEngine Lettering CodeModelSeriesHPIgnitionGear Oil
1956 to 1967SJPFortyPlus2-3Mk 1SAE 140
1967 to 1979FPFortyPlus2-3Mk 2SAE 140
1976 to 1979GFPFortyPlus2-3Mk 2SAE 140
1983 to *EFPW602-3Mk 3SAE 90
1983 to 1984EGFPW602-3Mk 3SAE 90
1978 to 1979FPCFortyPlus - Clutch drive2-3Mk 3SAE 90
1978 to 1979GFPCFortyPlus - Clutch drive2-3Mk 3SAE 90
1979 to 1989EFPCForty/55Plus - Clutch drive2-3Mk 3SAE 90
1983 to 1984AFPC552-3Mk 3SAE 90
* Current production models (as of 1989?) Some of these models carried on till the early 1990's, the EFNR till the end in 1996.
Year ManufacturedEngine Lettering CodeModelSeriesHPIgnitionGear Oil
1956 to 1967LLSCentury1004Mk 1SAE 140
1967 to 1973WCentury1004Mk 2SAE 140
1957 to 1967CPCenturyPlus - Fixed drive4-4.5Mk 1SAE 140
1967 to 1969CPCCenturyPlus - Clutch drive4-4.5Mk 2SAE 140
1959 to 1967WPCenturyPlus - Clutch drive4-4.5Mk 1SAE 140
1967 to 1973WPCCenturyPlus - Clutch drive4-4.5Mk 2SAE 140
Year ManufacturedEngine Lettering CodeModelSeriesHPIgnitionGear Oil
1966 to 1969SSilver Century4.5Mk 1SAE 140
1969 to 1979WSSilver Century4.5Mk 2SAE 140
1978 to 1979WSCSilver CenturyClutch drive4.5Mk 2SAE 90
1978 to *ESCSilver CenturyClutch drive/ Model 754.5Mk 3SAE 90
1966 to 1969SPSilver CenturyPlus - Clutch drive4.5Mk 1SAE 140
1966 to 1969SPCSilver CenturyPlus - Clutch drive4.5Mk 1SAE 140
1969 to 1979WSPCSilver CenturyPlus - Clutch drive5Mk 2SAE 140
1979 to *ESPCSilver CenturyPlus - Clutch drive/ Model 804.5Mk 2SAE 90
1979 to *EFNRSilver CenturyModel 110/90 with Reverse5Mk 3SAE 90
* Current production models (as of 1989?) Some of these models carried on till the early 1990's, the EFNR till the end in 1996.

There has been much argument about power output, these figures are as close to the claimed truth as I can make them! The real truth is the power heads produced a lot less, but the gearing gave the thrust equivalent to motors of the claimed power! See the note about the Trade's Description Act! John

Engine - Approx. Weights

ModelWeight (lbs)Weight (Kilos)
Forty Featherweight/ 452612
Forty Plus2813
Century 1003515
Century Plus/ Century Sliver Plus3817
Note: Weight based on 'dry weight' - tank dry, bracket stripped for carrying. Add approximately 4 pound for long shaft models.

Engine - Boat Type and Size Recommendations

HPModelVessel Type/ Size
1-2Forty Minus/ Forty Featherweight/ 45This engine is for 6-9 foot dinghies with low transom and in the category 1-2 hp. An easy motor to handle.
2-3Forty Plus/ 55/ 60/The ideal engine for 10-14 foot dinghies, rowing boats and as stand by power for smaller sail boats. Can be seen on larger craft too, up to 18ft!
4Century/ Century Plus/ 75/ Curlew/As a second motor for a motorboat or on 14 to 19 foot heavy dinghies.
5Century Silver/ 90/ OspreyHeavy work boats 14 to 19 feet, as an auxiliary for boats of 2 to 3 tons, full bodied boats, fishing boats, to 24 feet and as an auxiliary for boats 3 to five tons. This tonnage may be Thames, certainly not displacement!
6KingfisherYachts up to about 24ft, standby on motorboats of similar size. Have seen used on 30 ft boats!

Engine - Fuel Mixture Ratios

Year ManufacturedRatio1 gal. unleaded2 gal. unleaded5 gal. unleaded
1931 to 197810:112.8 oz. oil (3/4 pint)25.6 oz. oil (1 & 1/2 pints)64 oz. oil ( 3 & 3/4 pints)
1978 on (plus older converted models*)25:15.12 oz. oil (1/3rd pint)10.24 oz. oil (2/3rd pint)25.6 oz. oil (1 &2.3 pint)
Roller bearing models ONLY (25:1 recommended)This model left the factory, with a 50:1 oil mix. It was lethal. Use 25:1 if yours has survived!
* Current production models (as of 1989?) Some of these models carried on till the early 1990's, the EFNR till the end in 1996.

Century Ac Motor Serial Number Lookup

In the very early years there were motors running on 8:1, 10:1 and even 16:1, as has been found on tank decals of these old motors. These are the 'oddballs' though, the vast majority of the 3 million motors made ran on 10:1 mix.

The following should be considered when determining the right fuel mixture ratio for your engine: (information reproduced from a 1991 service manual No. 27)

Grade of Oil to be used. Only use two stroke oil for outboards. It must be for outboards, not lawn mowers or chainsaw, motor bikes or snow cats! Use TCW 2 or 3 grade. This is important as the oil is designed to lubricate at the low temperatures that British Seagull run at.

25:1 PETROL/OIL RATIO

All motors manufactured from January 1978 are designed to operate on a 25:1 petrol (gas)/oil ratio.

Motors manufactured from 1968 to January 1978 can satisfactorily use this ratio, providing the following modifications can be made. Prior to 1968 a shorter bearing was used in the crankcase and it is unsuitable for too lean an oil mix. See FAQ page! The Amal 2 jet needs the main jet changing to a No. 40. The Villiers needs a replacement needle, No.2, sadly these are no longer generally available.

August 06, I have 25:1 needles in stock again!! (they have now no number on them at all!)

See the FAQ page for other ways of reducing the oil mix on villiers carbs.

John Williams,

Century Ac Motor Serial Number Lookup

SOS


All 'Nailheads' '57 - '66

225, 300, 340
For 215 V8:

The engine number is stamped on the engine forward of the right cylinder head.
The production code number is stamped upside down next to vehicle number.

For 300, 340 V8s:

The engine serial number is stamped on the left front face of the crankcase, just below the rocker arm cover. On cars equipped with power steering it will be necessary to remove the power steering pump bracket to view the complete number.
The production code number is stamped on the right side of the crankcase and can be viewed between the middle branches of the right exhaust manifold.

For 198 V6:

The engine number is stamped on the engine forward of the right cylinder head.
The V6 engine production # is on the front of the block below the LH cyl. head gasket.

For 225 V6:


The engine serial number is stamped on the left front face of the crankcase, just below the head gasket. On cars equipped with power steering it will be necessary to remove the power steering pump bracket to view the complete number.
The production code number can be found on the crankcase between the front and middle branches of the right exhaust manifold.


350 inch until 1971
The engine serial number is stamped on the front of the left cylinder bank. The production code number is between the left exhaust manifold and the two front spark plugs.

Rheem Ac Serial Number Lookup


400 and 430 inch, 1967
The engine production code number is between the two forward branches of the right exhaust manifold, and the engine serial number is between the two rear branches.

Century Ac Motor Serial Number Lookup 1-800


L 250 inch from 1968
The engine serial number and the production code number are on the right side of the engine, to the rear of the distributor.

400, 430, 455 inch, 1968 on
The engine serial number is between the two front spark plugs and the left exhaust manifold, and the production code number is between the two rear plugs and the exhaust manifold, also on the left.

Trane Ac Serial Number Lookup


400, 430, 455 inch, all have the actual cubic inch that the block was cast for in the transmission mount saddle above the casting number.
In this case it is a 430.
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