Engine Work

[trackman 0]

My engine is coming out this weekend whilst I'm waiting for my rollcage. The plan is to change the timing chain/adjusters and water pump (leaking) and generally give it a good going over.

Someone has advised me to check the compression and oil pressure before taking it out, just in case the internals need any attention. Probably a good idea while it's out and easily accessible.

I need to know what compression I should have from a 2.8 AAA engine and what the oil pressure should read at what rpm?

Also, can anyone recommend any other procedures whilst it's out. The engine has supposedly done 115k but I have my doubts because of steering wheel wear.

Any help appreciated.

[six appeal 53]

With that mileage, it definately worth changing the timing chain and runners as you have it out! Particuarly given what you have in mind for the lump!

[acf8181 0]

on a new engine - 145-189psi (10-13 bar)

wear limit - 109psi (7.5 bar)

max difference between cylinders - 44 psi (3 bar)

[ Edited Thu Feb 03 2005, 08:30PM ]

[trackman 0]

Thanks for the figures acf8181.

A mate of a mate is lending me his compression tester tomorrow night. Don't suppose you know what the oil pressure should read?

[ Edited Thu Feb 03 2005, 08:39PM ]

[acf8181 0]

engine fully warm (oil temp at least 80 deg C/176 deg F), @2000rpm at least 2.0bar (29psi), at higher engine speeds 7.0bar (101psi)

...these are straight from the bentley manual by the way.

[antera309 3]

Here is a very useful thread on Timing chain replacement:

http://forums.vwvortex.com/zerothread?id=1264409&page=1

It includes a detailed procedure, the part numbers for all the bits you'll need and things to look out for.

The procedure assumes you have already removed the engine from the car, and taken off the gearbox, clutch and flywheel. Good luck!!

[trackman 0]

Thanks gents.

I think I'll have to get one of those Bentley Manuals.

There's one in the classifieds section for £35.

Sounds like it might come in useful.

Rich