Oil pump removal

Post by **Onne** » Wed Aug 30, 2006 5:06 pm

Hello all

I am trying to remove the oilpump from my low compression austin 948 engine.

Flywheel is off
Backplate is off
Bolts are removed (3 holding it in, 2 holding the cover on)

But the **** thing won't budge. Not with cold chisel, or whacking it with a big hammer.

Has anyone got any bright ideas? (And I do know it SHOULD come off without any hassle)

Onne

Post by **bmcecosse** » Wed Aug 30, 2006 8:16 pm

Yep - should just fall off! You could gently whack the camshaft through from the front (take the dizzy drive shaft out first) to 'encourage' it to fall off.

Post by **chrisd87** » Wed Aug 30, 2006 8:18 pm

Or just take the cam out entirely and give the end of the pump a good clout. That's what I did with the 1098 I dismantled.

Post by **bmcecosse** » Wed Aug 30, 2006 8:26 pm

Yes - but take care not to damage the camshaft bearing - only in the front section on a 948 (1098 has all three running in proper bearings) - but it will be ok with an AEA 630 cam - just don't use super heavy valve springs.

Post by **Onne** » Wed Aug 30, 2006 10:39 pm

So I do need to remove the timing chain cover. Might as well change the chain and the cam when I'm there.
Do I need to remove anything else? Or do I just remove the rockershaft to replace the cam?

Post by **Packedup** » Thu Aug 31, 2006 12:10 am

Rocker shaft, pushrods (which can be very stubborn to withdraw if there's a buildup of crud in the holes), tappet chest covers off and cam followers out (as you're fitting a different cam use the followers that go with it, and keep them in the right order), timing chain cover, chain and cam out.

I wonder if a drift made from a load of ratchet extension bars might be a handy way of shifting the pump?

Post by **bmcecosse** » Thu Aug 31, 2006 7:26 am

Yes - as pup says - use the followers that ran with the other cam - but do inspect them carefully and reject any that show pitting or cracking on the wear surface.

Post by **Onne** » Thu Aug 31, 2006 8:36 am

That would be a problem. I don't have the old followers. I will inspect the ones in the block and use those.

Post by **bmcecosse** » Thu Aug 31, 2006 10:10 am

Hmm - I thought you were taking the cam etc from your old 1098 engine? I have never had any problems mixing and matching followers - but others usually jump down my throat (shurely not on the Minor board!!) when I suggest something like that. New followers don't cost the earth - if there is any doubt about the old ones - then it would be better to renew.

Post by **Packedup** » Thu Aug 31, 2006 4:47 pm

Yeah, you're not supposed to use used followers with a different cam, or even get them mixed up when refitting, but to be honest if they're not worn out then I can't see the problem. I know they're meant to mysticalyl wear to suit each other, but I'm sure I must have mixed them up the odd time I've stripped and rebuilt an engine to that exgtent, and I've never noticed a problem from it

Post by **Onne** » Fri Sep 01, 2006 11:48 am

I have finally managed to remove the oil pump

Removed the head, all looks very nice, then I removed the pushrods, keeping them in order of course.

Out came the cam, and a lenght of wood helped the oilpump make up its mind

New timing chain and sprockets on (how tight should the chain be)

Onne

Post by **bmcecosse** » Fri Sep 01, 2006 2:52 pm

Just snug - there is no adjustment. If the sprockets are not perfectly aligned (check with steel rule) it can make the cahin feel 'tight' - then you should sort it out with shims - or recently I had to machine 40 thou off the camshaft sprocket rear face to get the camshaft endfloat correct. Seems this is not unusual (according to the Mini board) although first time I have come across it.

Post by **Onne** » Fri Sep 01, 2006 5:30 pm

they look nicely aligned. Have changed to the 1098 cam btw

Post by **bmcecosse** » Fri Sep 01, 2006 7:05 pm

You will notice the difference - even more so once you get the 202 head on there as well.

Post by **Onne** » Sat Sep 02, 2006 12:45 pm

Rockers etc all the same? I have got a recently rebuilt 202 head.

Post by **RogerRust** » Sat Sep 02, 2006 12:58 pm

Onne you are getting ahead of me!

Actually I started from behind. I've got sort of stuck at the do I rebuild the suspension then respray or................

Its time I stopped worrying and got on with it. I've collected a 12g940 head and a 1.5 inch carb and MG manifold. Chris87 has a 1098 cam for me. So it should be all go soon.

By the way have you got your interior kit yet? I ordered mine from Bullmotif last week along with the other bits and pieces to get it finished.

Post by **Onne** » Sun Sep 03, 2006 11:10 am

I haven't got my interior kit yet. It is starting to really really annoy me actually, since I ordered it last december.

They say they can't get the colour. I have already paid for it of course

Post by **bmcecosse** » Sun Sep 03, 2006 6:59 pm

Rockers are the same - but you would need to get the 202 head skimmed by 60 thou to keep your compression ratio up.

Post by **Onne** » Sun Sep 03, 2006 11:09 pm

I'll stick to my standard head then, I can't afford any skimming at the moment.

So the choice:
Standard 12G202 (been skimmed a bit maybe 20 thou)
Standard 948 head

Post by **bmcecosse** » Mon Sep 04, 2006 1:15 pm

Stick with the 948 head then - and save up for the skimming. You can check the 202 head by measuring the thickness - all standard heads start life at 2.750". Anything less than this is what has been skimmed off over the years. Or - go the 12G940 route - as several seem to be now doing. To be honest - if the car is just a run-around and not expected to pass everything in sight - just stick with the standard head and upgrade to the 202 when you can.