Low compression on my eclipse

[Hydecotsi]

Okay well for the past few weeks I have been working on my eclipse. Me and my buddy who is very good with the dsms. It started as a oil leak. Well we chased that down and it was the oil pump gasket. We pulled it apart and fixed that problem, we put everything back together and left the timing cover off to make sure the leak was fixed. Well after hitting boost a few times (would not leak idleing) we found that oil was coming from right above the oil pump in between the head and the block. My question is has anyone see oil leak from their head gasket before on the turbo dsms? Also, we followed up with a compression test and the results were cylinder 4 has 140. Cylinder 3 was 110. Cylinder 2 was 82 and cylinder 1 was 110....is this indicating bad rings or the head gasket? Their is no coolant leak, exhaust steam,oil in coolant and or water pushing out of the over flow. ik I shouldn't have got this dsm

 

[jayson427]

It might be your front case is cracked. You bought a 90 gsx it's going to have problems but these cars can be the most reliable car ever if done right. Depending on how bad it is you might be able to get away with new rings but who knows till its all apart.

 

[BogusSVO]

There is no oil feed or return on a 4g63 engine in the area you describe.

Now there are 2 oil galley plugs behind the cam gears, not tight enough it can leak.

Bad cam seal, or bad valve cover gasket, or a cracked valve cover could leak down behind the timing cover

 

[Hydecotsi]

I have another motor to go in it just got to get some small thing to finish it up. By front case do you man like a crank in the block? Or head? The oil pump housing looked great no cranks at all. Yes ik it's a 90 I expect problems but I drove it to times and I'm gonna have to pull the motor on the dang thing.

 

[Hydecotsi]

Oil pump case was great nothing wrong or cracked torqued them to spec and everything with my snapon trq wrench. The oil galley plugs behind the cam gears are tight. Also the cam seals have not residue on them at all it coming from right between the head above the water pump in between the head and block.

Also valve cover gasket is new and valve cover has no cracks we can find anything wrong but yet this oil in that area not any higher or any lower.

 

[jayson427]

Can you post a couple pictures? That might help a little. Oil leaks are a pain to fix. If you have low compression and your going to pull the motor just keep filling it with oil.

 

[BogusSVO]

The front case is the chunk of aluminum on the front bottom of the engine, the cank passes through it and the oil pump is built into it.

In your post, you said the oil leak was from the oil pump gasket, you had the front case off to replace the gasket.

Doubtfull you have a cracked head or block into an oil passage.

Now does this engine have a BSE done? If yes, the bolt that holds the small BS belt tenstioner pulley, is it sealed? also is the plug sealed for the block off for the front BS?

Now if you still have the BS set up, there us a small spacer on the front BS. if you do not have this behind the gear, the oil seal will have nothing to seal too and cause a leak.

 

[Hydecotsi]

The balance shaft is gone and yes they are sealed the oil pump housing or front case had no cracks at all or anything. I can get some pics soon and I'm not driving it because it's not my dd and I would rather fix it than to be blowing oil,all over the car I want to fix it right I'm just stumped....the oil is running down the top,of the water pump hitting the timing belt and slinging it everywhere.

 

[4wsaddict]

Ive only had the problem with either a bad head gaskets or stretched factory head bolts. That is as long as i understood where the oil leak is now since you say the front cover and oil pump area is now sealed. the stretched head bolts also may show no signs except low compression and low oil pressure at idle and and high under boost due to cylinder leakage.

 

[Hydecotsi]

Ive only had the problem with either a bad head gaskets or stretched factory head bolts. That is as long as i understood where the oil leak is now since you say the front cover and oil pump area is now sealed. the stretched head bolts also may show no signs except low compression and low oil pressure at idle and and high under boost due to cylinder leakage.

It is possible that the head bolts are toast....I just got the car and who knows what has be done. I'm really scared to mess with it with that low of compression. But if most of u think its cause by the head gasket and not the rings I will fell much better about it.

 

[jayson427]

It's probably a combination of both. I think a leak down test would help you narrow down the ring or head gasket issue.

 

[Hydecotsi]

Ok well I'm gonna try the oil in the plug hole tomorrow to see if it raises the compression any.