1098 Engine modifications

[John.n]

just been to try and pein the oil pump drive in the cam shaft and have found it is a very loose fit. pushes about half way past where it should fit. any suggestions?
Regards,
John

[bmcecosse]

I am sure it is NOT the correct drive pin..

[les]

Take a picture of this pin, and end of camshaft.

[John.n]

can new pins be bought?
Ill take a pic when I get chance. it wont fall out once the pump is fitted due to the shape. it is most strange though. I think someone has had the engine apart before me as it had more than its fair share of gasket sealant on everything.
Regards,
John

[les]

It has to be an interference fit, you need to be sure of that!

[bmcecosse]

It is a v important pin.... and if too short could perhaps come out one end -leading to a smash up with the oil pump drive and an almost instantly seized engine. I'm sure a new pin could be made from the plain shank of (say) a longish Allen screw or something similar - or a bit of silver steel, something like that.

[John.n]

I have found the pin does have a taper on it as it only fits into the crank one way. is it possible that crank is not a standard one?
how do I identify a what type it is?
Regards,
John

[bmcecosse]

I hope you are fitting it in the CAMshaft.... I'm not aware of it being tapered.

[John.n]

that was a bit of an epic typo...I mean camshaft.
I could just get round the problem with a different camshaft? does a 1275 cam work nicely? might bite the bullet and fit the mg metro cam.
I havent had chance to get near the car much recently
Regards,
John

[bmcecosse]

Any (A series) cam will fit - the MG will give an advantage of course - a 'standard' 1275 cam no advantage at all, although it will have wider lobes and very slightly advanced timing. Either of course will require a different spade drive oil pump........

[John.n]

given up with the whole oil pump pin drive problem and got an MG metro camshaft. sames me worrying about the pin, makes me fit a new oil pump and improves performance! seems good all round.
Ill have to see what it looks like when it gets here though.
Regards,
John

[bmcecosse]

Just make sure it really IS an MG cam....

[John.n]

how do I make sure?
what markings should be on there?
Regards,
John

[bmcecosse]

A 1/4" wide groove cast in the shank beteen the 1st two lobes........

[John.n]

like this one?
http://www.ebay.co.uk/itm/MG-METRO-CAM- ... 7675.l2557

[bmcecosse]

Yes! That's the one!!

[John.n]

thats good news then, hopefully it will arrive soon!

[John.n]

bit of an update.
Got an MG metro camshaft! looks in reasonable nick, no flats on the high points or scoring
a 12g940 head. still need to sink the valves into the head.
1275 rockers to fit.
a crankshaft damper.
on order:
tounge drive oil pump.
1275 copper head gasket.

does it sound like im missing anything? any other suggestions?

Regards,
John

[bmcecosse]

Sounds good. Have you measured the head to check the clearance from valve face to head face for the exhaust valves?

[MarkyB]

New cam followers?
I believe it's considered good practice to replace them when changing the cam shaft.