1098 Engine modifications

[bmcecosse]

Depends if it was run for any significant time with the gasket blown. It can scour the block - or indeed create a crack . A scour could be machined out with a skim (but if significant the pistons may also need skimming down) - a crack = scrapped block....

[John.n]

unfortunatly it looked cracked between cylinders...not sure it the other parts would be worth saving like the crankshaft, cam shaft pistons conrods, head, ect.
Regards,
John

[bmcecosse]

Yes - if the price is right. The cam is an excellent upgrade for a 948 engine - the head also (assuming 202) but will need 60 thou skim for use on a 948. With both in place a 948 will generate same power as a 1098 - but at 10% higher revs of course!

[John.n]

just been having a look at new oil pumps and have seen that they are described as pattern parts modified to fit. this dosent strike me as high quality for such a critical engine part. any thoughts?
Regards,
John

[bmcecosse]

Dunno where you are seeing 'modified to fit' oil pumps.... You said earlier an MG Metro cam - so this is the pump you need.
http://www.ebay.co.uk/itm/MINI-OIL-PUMP ... 2a0094f364

[John.n]

the modified oil pumps are one one of the well known supplier's websites, it was a pump for the standard camshaft.
how do I open up the original to chack for wear? is it just the one flat head screw?

Regards,
John

[bmcecosse]

Yes indeed. So - no MG Metro cam now?? This pump then... http://www.ebay.co.uk/itm/Austin-Morris ... 27ce8db030

[John.n]

not sure on the cam yet... might get an mg one if it comes at the right price.
would I need to replace the cam followers if I used a cam with wider lobes?
Regards,
John

[bmcecosse]

If you change cam you should considerr new followers anyway. What do the followers in your negine look like right now? And you didn't show us a picture of the metal rod you found?

[John.n]

I took the camshaft back out and it was the pin drive for the pump. lucky it fell out through one of the holes for the cam followers or I would have never known...until I started the engine. could have been expensive. looks like a bit of poor design to me. nothing to stop the pin falling out when the oil pump is removed.
Regards,
John

[bmcecosse]

It should be peened in there - not able to fall out. And it doesn't have 'flats' on it... When the cam is in place it can't escape becuase of the bearing - but equally it should not be able to slide side to side and rub on the bearing either. You need to fix this properly....

[John.n]

looked like it had never been peened in originally. guess it has either been replaced or missed when new

[bmcecosse]

Certainly not right - get it fixed properly - the consequences of a failure would be disaster for the engine.

[les]

I imagine you have put the camshaft in now but in case it's still on the bench, you need to put a centre punch mark near the end of the pin, that will make it tighter when tapped in place.

[John.n]

I will take the cam back out and sort the pin out as required.
does anyone know where I can get a new locking tab for the oil pump? hine has sheared off and can't be reused.
Regards,
John

[bmcecosse]

I always use split washers under the bolt heads. BTW - make sure you don't do what an idiot on a Mini forum did recently....and shear the bolt off in the block....

[John.n]

what is the right torque for the pump bolts? dont fancy shearing off the bolts worse would be stripping the threads though. helicoils are not that cheap!
Regards,
John

[bmcecosse]

8 ft lbf I believe - but honestly - common sense tells you - torque wrenches are not much use at such low settings - unless of course you buy a miniature one..... On the cam pin - I can say that I have really struggled to remove one of these pins in the past - so it really must be SECURE in the end of the cam, and not able to slide out at all. I rather think the pin you describe at 20mm long with two flats - is not the correct/original pin....

[John.n]

Some more bits have arived for the engine!
got a crankshaft damper and a 1275 rocker assmebly.
standard pushrods will fit the 1275 rockers wont they?
Regards,
John

[bmcecosse]

Yes!