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#22101 02/28/2002 5:39 PM | Joined: Mar 2001 Posts: 20 Junior Member | | Junior Member Joined: Mar 2001 Posts: 20 | My 52 chevy pu has been my daily driver for the past eight years and I have never had a problem with the engine until recently. I did a compression check of the engine last night and all the cylinders checked out except the secound from the rear of the engine. It had zero compression. The engine starts fine and runs well. What could be the problem? It is a 57 model, 235. | | |
#22102 02/28/2002 6:31 PM | Joined: Feb 2002 Posts: 121 Shop Shark | | Shop Shark Joined: Feb 2002 Posts: 121 | Muzzeloader, put that cylender at top dead center on the compression stroke. Then apply air to the sparkplug hole. listien for air comming out of carb , tailpipe, and crankcase- crankcase will have some no mater what, but if you are not getting any compression it should be alot. other places should have very little or none. this could be a stuck valve. BUT YOU SAY IT RUNS SMOOTH? HMMMMM. CHECK YOUR COMPRESSION GUAGE. could be bad valve. not keeping pressure. | | |
#22103 03/01/2002 5:16 AM | Joined: Oct 2001 Posts: 428 Shop Shark | | Shop Shark Joined: Oct 2001 Posts: 428 | Muzzleloader,
My guess would be a stuck valve also. I don't think it is your gauge, if it was it would show bad readings on more than just one cylinder. You say that the engine runs good, but it may not be as good as you think. I had a 350 in my C10 and it also ran good, or at least that is what I thought until it started giving me trouble. Did a complete engine check and found bad rings, burnt valves, plenty on "slop" in the timing chain and gears (don't know how it ever stayed in time) and oil pump screen was almost totally blocked with junk. I installed a new engine recently and I can't believe how I ever thought the old engine was ok. Just my 2 cents. | | |
#22104 03/01/2002 6:23 AM | Joined: Mar 2001 Posts: 20 Junior Member | | Junior Member Joined: Mar 2001 Posts: 20 | Perhaps I should clarify the condition of the engine. It starts as easily as always, though it does run a little rougher than normal. That is why I did the compression check. I did the body work on my truck and much of the mechanical work, but I have no experience tearing into the motor. Is a valve job dificult to do on the 235? Any idea as to the possible problem and what should be done will be greately appreciated.
Bill | | |
#22105 03/01/2002 8:43 AM | Joined: Sep 2001 Posts: 272 Shop Shark | | Shop Shark Joined: Sep 2001 Posts: 272 | Bill
Did you do a "wet" compression test? That will help determine whether rings or valves. Redo the compression test and put about 5 cc of trans fluid in the spark plug hole before taking your reading. Use the same amount in every cylinder for uniform readings
Bad valves will not increase the PSI value. Worn rings will increase PSI Values. You will get a 5-10 PSI increase with good rings and 30-40 or more with bad rings.
Try the local drugstore for a syringe like many use for their kids liquid medicine.
CAUTION USING MORE FLUID OR HEAVIER WEIGHT FLUID CAN CAUSE SERIOUS ENGINE DAMAGE!
Brad | | |
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