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EA82T compression problem(before pic of head added)
Posted 10 May 2004 - 09:46 PM
I was only getting one pulse from the crank angle sensor to the computer,
instead of four.
Checked all, and I mean all the wiring, and found the
open circuit in the harness before it goes into the firewall.
Car will start and run if you keep the revs up, will not idle.
Hell, it’s pretty impressive for a 2 ½ cylinder car.
Now a new problem has arisen that is taking all the fun out of this rebuild.
Compression check wet and dry gives me cylinder #3 at 50lb. and cylinder #1 at 25lbs.
Car was timed correctly. I did a leak down test on
both the cylinders with the cam case removed and timing belt off passengers’ side,
exhaust manifolds off and the throttle plate open.
When I charged the cylinders with compressed air (150lb) it resulted in the piston turning to its lowest position,
no leaks from int or exh.,
and a very slow hiss from the oil passages leading to the pan.
Both cylinders leak past the rings slowly at about 5lbs in 15 seconds.
I don’t think this is excessive enough to cause the low compression by bad rings.
Test was done on a cold engine.
I had the heads gone through, three angle valve job, new seals, and pressure checked before they were installed.
Pulled the head and the headgasket does not show any signs of leaking, Looks like it did when I put it on the car (47 lbs.).
Heads off the car and fill the intake passages up with fluid, no leaks. Same results with the exhaust side.
Mounted the cam case with the cam(Delta) and checked open/close and the valve seats, it’s all good.
The lash adjusters are suspect. When I pulled them while rebuilding they spent most of the time sitting on the bench upright.
They got knocked over a few times.
Soaked them for a while and attempted to pump them up submerged in oil,
but they would not compress.
Could bad lash adjusters cause the low compression by holding the valves open?
I’ve got 10 days to find this problem and fix it and I am at a loss.
Carlisle is coming up and a stock 2002 Legacy is not my ride of choice.
. I've got pictures of everything I did when I put this engine back together.
I've looked for the Wiley Coyote sign that says something was wrong and I'm not seeing it.
You want to see something to get an idea of wear and tear or what I've done, let me know.
Looking for educated guesses
BTW, If you have taken the time to read this post,
reply with your suggestions. what can it hurt and
you might lead me to the culprit. thanks again, J
Posted 10 May 2004 - 10:52 PM
Posted 10 May 2004 - 10:55 PM
Posted 10 May 2004 - 11:03 PM
Posted 10 May 2004 - 11:07 PM
Posted 11 May 2004 - 08:10 AM
Posted 11 May 2004 - 01:13 PM
the hydros would collapse if they were bad, so, that shouldnt have anything to do with your problem.
Posted 11 May 2004 - 05:55 PM
I have another set of lash adjusters that only have 21K on them,
so they are going in once I get the head pressure checked again.
Did the compression check on a hot(wet)and cold(dry) engine.
Same #'s both times. A bit lower on the cold test.
Did the leak down test on cold only.
Thought it would be worse.
Unfortunately, before I started this rebuild,
I didn't check compression and ASSumed because
the engine was running
so well that everything as far as rings was up to snuff.
Now I definately wish I would have done it. At least to take it out of the equation now.
rings on # 3? But blowby wouldn't explain #1. See how pretty!
Posted 11 May 2004 - 09:44 PM
Posted 11 May 2004 - 10:43 PM
Posted 12 May 2004 - 09:54 PM
Machine shop looked at the heads today and they check out OK. Need to check valve spring tomorrow.
May send the cam back to Delta to verify OK. Going to reassemble with new lash adjusters and factory cam to see how it does.
If it doesn't run correctly, I'm going to rebuild the bottom end of the other turbo motor I have and start from there.
At this rate, I probably won't make Carlisle with it. damn.
Posted 12 May 2004 - 09:59 PM
Posted 13 May 2004 - 01:24 AM
If I understand correctly I would give you three things. most have been covered already.
first- the cam timing off has to be the most obvious. make sure you have it correct. I have messed it up more than once.
second- the lifter issue. but you would have heard a lot of lifter noise if that was the case.
third- blown head head gasket. improper torque method? over torqued?
if you are running delta cams you will have lower compression readings as well. just keep that in mind.
what was wrong with the motor originaly? I may have missed that part.
Posted 13 May 2004 - 08:00 AM
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