Advice Wanted!

[Moys1.9 0]

At the mo my 1.9 is stripped right down to the liners. as can be seen in my earlier posts compression test results were:

no4 was 0 bar

no3 was 6 bar

no2 was 6 bar

no1 was 10 bar

 

We put a tea-spoon of oil in and retested but there was no change (to test if prob was piston rings).

 

We've now stripped the engine all the way to the block and removed no4 piston. the piston ring recesses were full of carbon build up and oil (should have been cleaned up as mech said he'd replaced the rings). The O ring on no4's wet liner is completely perished.

 

Also really stupid question but I'm gonna ask anyway to make sure: On top of all the pistons is a marking which reads dist and then an arrow. Currently the arrows are pointing away from the dizzy? does this sound right? couldn't find anything in the Haynes joke book.

[Moys1.9 0]

Just checked the search function and understand the markings dist on the pistons. Still need advice for other stuff please.

[pugrallye 0]

whats this o ring on a piston???? do you mean the oil seal? if sticking oil into chamber to diagnose poor compression, non cure would normally indicate a problem other than piston rings, so rings and piston being covered in cr** is not a surprise. and quantities of oil entering piston chamber through leakage would bust through any piston ring pretty easily over time, obviosly dependent on level of leak. To get 0 bar you have to have a pretty serious leak!

Edited April 7, 2006 by pugrallye

[Moys1.9 0]

As I originally said The O ring on no4's wet liner is completely perished. Not the piston. We did have a serious leak coming from the sump gasket which we've also removed. The sump gasket was also supposed to have been replaced.

On the subject of the sump, the sump bolts where replaced in a random order. There were 4 allan key headed bolts, the remaining ones are hex headed. The haynes manual says they have to be replaced in reverse order of removal. Anyone know the correct order ?

Edited April 8, 2006 by Moys1.9

[jack biscuit 0]

Not a clue, i've just pulled all mine out of the 1.9er willy nilly, just torque them up evenly similar to head gasket.. i can't see what the problem is.

 

Bollocks to haynes, cut and paste merchants!

[sorr 0]

No compression would indicate the cam timing being completely out or bent valves. Unless you had vistually no piston rings you would still get some compression.

 

I would look at the head for the problem. The liner seal would not affect compression it is there to stop the water in the head mixing with the oil in the sump.

[Moys1.9 0]

There's an engineering place in Blackburn who do almost everything with heads. Think I'll send the head to them and also get them to re-seat the valves as its only a few quid per valve. Does that sound like the best step to take next?

[rjw205 8 3 Cars]

As you've got the thing in bits.. you may as well get them to service the head.. as this will remove one aspect of the problem for you. valves not seating could well be the cause of the problem. They only have to be a fraction out to create a gas leak.

 

Rich

[jonah 1]

Take the cam out so that the valves are shut (or should be). Turn the head upside down and put a spoonful of meths or similar in each combustion chamber. If the level falls then the valves are leaking.

 

Was the head gasket sealing properly? Were the fire rings evenly compressed? Any lumps or gouges in the head or liner tops that would have caused it to leak?