If you used a compression tester to find no compression on #2, and you don't have a leak down tester, or availability, as Jeff answered, then do a wet compression test. You did a dry test to find no compression. Now put about a tablespoon of oil into #2 and retest compression. If compression improves significantly, then the piston rings were causing compression loss. If compression does not improve with wet test, then it was a valve causing compression loss. The oil will temporarily seal the rings from compression loss-that is the idea.
Jeff's suggestion of a leak down test is just more accurate than a compression test, but if no tester or can't afford the test, then the wet compression test is next best solution.
Thank you, everyone. I did do a "wet test" with 0 improvement. I have removed valve cover, everything "looks fine" and is working, as I turned motor over by hand. Gonna the compressed air test. But if leaky valve is problem as suspected, now what? Pull rocker and inspect further?
I think it would be time to pull the head off and repair the valve/ valve train, by then, eric. You will need some valve work done. I found an independent machine shop last year to do some cylinder head work. Poor guy was swamped with work, but after a month he got to my work, and with pressure testing included, the head work was less than $200, only added new stem seals, but had it all apart and cleaned and all, I thought that was very reasonable. Your head would not need a whole lot more, maybe you could find as good a shop. Look for independents with known recommendations.
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You put compressed air into the cylinder an listen for the air escaping , if coming out of the throttle plate ,burnt intake valve . If you hear air coming out of exhaust pipe , burnt exhaust valve . If you hear air coming out dip stick tube bad rings or piston damage. How To Perform Leak Down Test EricTheCarGuy
Jeff. Thank you. Intake valve definitely open. Everything looks like its working mechanically, can't tell if valve travel is correct, no way to measure or gap. But its def not closing, need way to determine. Guess its decision time. Pull springs or and hope. Or pull head.
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If you have the head off, turn it upside down and put some diesel oil in the recess where the valves are. If they are leaking, the oil will drain out.
SOURCE: I have an 2002 Jeep Liberty that keeps throwing
yeah it needs a new cylinder I see this all the time. The valve stem guide in the head drops and sticks the valve open the rocker and cam lose tension and thats why the rocker keeps breaking. Take the valve cover off the head that your have problems with. remove the rocker put a socket over the valve spring. gently tap the spring down without loosening the keepers. You will notice that the valve will not return to the closed position. I garuntee this is the problem u r have I hate to give u the bad news.
SOURCE: one cylinder has zero compression. took head off
OK!... did you do a cylinder 'leak down test'?.. .if not, do it! If any 'unacceptable' leakage, have the head REDONE! NOW!.. you must BE SURE the valve timing is accurate!... Go to www.hmaservice.com and register( Vehicle by VIN). Afterward, you have access to shop manuals, service bulletins, wiring diagrams, etc. about your vehicle.
SOURCE: Size of valve springs fo 289 ford engine with 302 heads
its not that easy here are some of the things u need to know
* solid or hyd cam
* roller or flat tappet
* valve installed hieght
* rocker ratio
* cam lift
this is just a few things go to a head shop and they will choose the right ones
SOURCE: I have a 2002 Jeep Grand Cherokee, 6 cyl. no reverse
if you cant rebuild then off to the tranny shop
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Thanks bro. Head not off..... Yet. Looking that way though.
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