Camshaft Profiles

Just won a Service Parts List book on the Bay. When it arrives I am hoping that it might have something on engine numbers and dates.

David, agreed that the 'S' in Chris' engine number refers to power steering. Found a cross reference on one of the C-Series engined cars.
Nick

My BMC Service Part List arrived this morning. Anyone who has one of these will know how much useful information there is inside. Mine is a 1969 edition that covers the 1800 MkI & II, the MkII 'S' and the 18/85. It doesn't cover the 18/85 MkII so it is pre May '69.

To return to David's original title in starting this post I had a look at the camshaft parts and which engines they applied to. Don't think this is going to solve anything but for the record here they are. (I'm listing HC engines only to make it easier)

first 18AMW...101 to 27522
second 27523 to 97273
third 97274 to 115738; also Sb (PAS) 94032 to 104900; also 18WB/SB 101 to 8509

the third version also featured in 18H197...104901 to 115600

These are all MkI so can we assume the 18H numbering series came out before the end of MkI production and that all MkIIs are 18H only - I think so ??

My 1970 car has engine number 18H305BHnnnn. I thought the later ones didn't have a much meaning but the parts list has a translator for all the three digit codes

18H - 1.8 litre tranverse (easy bit)
305 - Mechanical Petrol Pump, Lucas C40 Dynamo, Power steering, Cable control all synchro gearbox
B - Positive crankcase ventilation
H - High compression
nnnn - serial number (made this anonymous)

It matches the original spec of a manual 18/85 MkII so it could be the original power unit.

I also have a Glass's Guide Car check book for 1968-77 which dealers used for checking what vehicles they were looking at. The Wolseley MkI and MkII overlap each other by two months and from my more recent motor industry experience I know that this is not unique. It is likely therefore that some of the numbers on cars and engines could overlap too. I feel sorry for those who had to compile the workshop manuals.

I guess that factory records is probably the only way of knowing the years of manufacture for sure but it looks like the 18AMW series finished some time before MkII production started in 1968.

All good fun, I have enjoyed digging into this.
Nick

David,
Those camshaft part numbers:

First is 12H 1294 (up to H27522
second is 12H 34 (H27522 to H97273)
third is 12H 2435 (the rest of the AMW series, 18WB & 18H197)

1800 MkII is 12H 2436
1800 'S' is 12H 2746
These last two may change after the date of my listings, who knows.

Found another date point for you
Sept. 1967 Power steering is optional for Austin & Morris versions from engine 94032. Source - Glass's Car Check Book.

Nick

Nick

Thanks again! With Chris (thanks also) confirming that his 1964 parts list shows the cam as 12H1294 I think this means the following

UK (excluding automatics etc)

18AMW 101- 27522 CAM 12H1294 5,45,51,21 0.312 valve lift
18AMW 27523- 97273 CAM 12H34 TDC,50,35,15 0.355 valve lift
18AMW 97274-115738 CAM 12H2435 5,45,40,10 0.353 valve lift
18H197 Mk11 CAM 12H2436 5,45,40,10 0.353 valve lift

1800S CAM 12H2476 16,56,51,21 ? valve lift

(Valve lift figures vary a few thou between w/s manual editions)

It looks as though the cam difference between late Mk1 and MK11/111cars is the addition of the lobes for the mechanical fuel pump. The 1800S and MGB cams differ only in this respect too I believe.

The early Mk1 has a little hotter cam but less valve lift, the intermediate Mk1 cam was virtually the same as on later cars but retarded to give more low down and less high end running.

I now have more info on Australian cams and it appears that the 12H2435 was fitted to their first engines and then changed to the same as for the UK for engines 18AMW27523-97273. There were two further changes in Australian cams but I don't have the details yet.

My Mk1 was produced in 1967 but ran the original 12H1294 cam and the engine number accorded with the log book.

Nearly there!

Thanks again


David

MGB 5 bearing engine seems to have 88G 303Z as the standard cam across all models........?

Chris.

Sorry Dave, I promised you details on a mk 1 1800. Sadly, I just can't find the BMIHT certificate. I'll let you know if I find it.

Anyway, the car was a mk 1 Austin 1800, registed in Norway on June 2nd 1968. The engine number is 18 AMW-U-H113157. I've still got the engine. The car was scrapped, as it was seriously rusty..

Regards, Tommy:-)