my home made leak down test tool
Thread Starter
Drifting
Joined: Aug 2011
Posts: 1,861
Likes: 1
From: panama panama
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hitmanpty, read your FSM concerning compression test. no cylinder below 100, or less that 70% of the highest. your engine is within guidelines, per my 91 FSM, so what is your problem, exactly? you need to show it or describe it so we understand.
if you already have decided that number one is "dead" what does that mean? plug fouled? is it the correct plug?
these important questions have been asked before, with no response -or maybe I missed it.
is it possible that number one plug wire is damaged? have you been puncturing it to check timing? etc.
if the cylinder has been showing compression -finger test, whatever- it isn't dead. maybe not ideal, but may be normal for an old engine.
before I tore an engine apart I would be certain what the problem was that I intended to solve. as you said, it has been over a year, and you are back to the same issues.
add: I agree: forget the leak down test, and start a new thread
hitmanpty, read your FSM concerning compression test. no cylinder below 100, or less that 70% of the highest. your engine is within guidelines, per my 91 FSM, so what is your problem, exactly? you need to show it or describe it so we understand.
if you already have decided that number one is "dead" what does that mean? plug fouled? is it the correct plug?
these important questions have been asked before, with no response -or maybe I missed it.
is it possible that number one plug wire is damaged? have you been puncturing it to check timing? etc.
if the cylinder has been showing compression -finger test, whatever- it isn't dead. maybe not ideal, but may be normal for an old engine.
before I tore an engine apart I would be certain what the problem was that I intended to solve. as you said, it has been over a year, and you are back to the same issues.
add: I agree: forget the leak down test, and start a new thread
number one cylinder is not working. if i disconect the fuel injector wire it make no diferance on the engine. thsis cylinder is not working for sure.
I have good spark. new spark plug same that i use in the rest of the cylinder. and work ok in the other cylinder. and yes those are the correct spark plugs. i already cover this in other post.
new spark plugs. 2 week old. i change because i was covering the basic.
timing ok everything is ok. compreasinon test on that cylinder is low in my opinion,
all the ignition systen is almost new spark plugs , wires, distributor componets, injectors are good, good volt on injectors wires. good spark on spark plug.
Thread Starter
Drifting
Joined: Aug 2011
Posts: 1,861
Likes: 1
From: panama panama
new development.
since i dont have the leak down test tool. and I just dont have the butget to get one at this time. I decided to open the cylinder head this afternoon.
I just finish opening up the right side head. I can confirm I have a leak on exhaust valve on cylinder one. I did the water test and that valve is leaking all over.
test the other and look ok no leak.
to bad I dont have pictures since i give my phone to my son. to go to the movies.
any way. I can confirm number one cylinder exhaust valve have a leak.
the piston walls look ok i use my finger and is very smoth. intake valve also look ok also did the water test. the only valve leaking is the one i mention above.
will open a new post with pictures as soon as I can.
since i dont have the leak down test tool. and I just dont have the butget to get one at this time. I decided to open the cylinder head this afternoon.
I just finish opening up the right side head. I can confirm I have a leak on exhaust valve on cylinder one. I did the water test and that valve is leaking all over.
test the other and look ok no leak.
to bad I dont have pictures since i give my phone to my son. to go to the movies.
any way. I can confirm number one cylinder exhaust valve have a leak.
the piston walls look ok i use my finger and is very smoth. intake valve also look ok also did the water test. the only valve leaking is the one i mention above.
will open a new post with pictures as soon as I can.
Team Owner
Joined: Aug 2004
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From: Park City Utah
Advanced
Joined: Oct 2012
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If I had one or more cylinders showing low compression I would add some oil to those cylinders and test it again. If the readings are higher then most likely the rings are worn. Either way I would have the heads tested and/ or rebuilt as well.
