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| | | | Joined: Jul 2012 Posts: 59 Wrench Fetcher | | Wrench Fetcher Joined: Jul 2012 Posts: 59 | I did a compression check on my chevy 235. I found that number 4 didn't have any compression. So I took the head off and found this- [IMG] http://i24.photobucket.com/albums/c33/hotrodfink47/2012-07-26172006.jpg[/IMG] My question is if this is caused by the rings not seating correctly? I took the piston out to get new rings but the Head of the piston says .06. I think this is pretty much maxing out the cylinder. I went by some auto parts stores and they don't carry any rings that size. Has anyone else had this problem?
Last edited by berts53; 07/28/2012 6:29 PM.
| | | | | Joined: Jul 2012 Posts: 59 Wrench Fetcher | | Wrench Fetcher Joined: Jul 2012 Posts: 59 | yeah they don't have anything either.
Last edited by berts53; 07/28/2012 7:14 PM.
| | | | | Joined: Sep 2001 Posts: 29,269 Bubba - Curmudgeon | | Bubba - Curmudgeon Joined: Sep 2001 Posts: 29,269 | What year 235 do you have?
| | | | | Joined: Nov 2005 Posts: 6,100 'Bolter | | 'Bolter Joined: Nov 2005 Posts: 6,100 | Hy berts53, I have never seen zero compression caused by rings, burned or stuck valves, but not rings, please check the head as well, hope that helps. | | | | | Joined: Sep 2009 Posts: 123 'Bolter | | 'Bolter Joined: Sep 2009 Posts: 123 | | | | | | Joined: Jul 2012 Posts: 59 Wrench Fetcher | | Wrench Fetcher Joined: Jul 2012 Posts: 59 | | | | | | Joined: Sep 2011 Posts: 1,453 'Bolter | | 'Bolter Joined: Sep 2011 Posts: 1,453 | Hy berts53, I have never seen zero compression caused by rings, burned or stuck valves, but not rings, please check the head as well, hope that helps. X2. To have Zero compression you should be able to see past the rings into the oil pan! Roll the head over, fill the combustion chamber with a thin liquid and watch it run past a valve.
Last edited by BC59; 07/29/2012 2:22 AM.
BC
1960 Chevy C10 driver 261 T5 4.10 dana 44 power loc
1949 GMC 250 project in waiting
1960 C60 pasture art
Retired GM dealer tech. 1980 - 2022
| | | | | Joined: Sep 2001 Posts: 29,269 Bubba - Curmudgeon | | Bubba - Curmudgeon Joined: Sep 2001 Posts: 29,269 | Wait for this to load. Also, NAPA on-line says you have to call a local dealer and they will check availability at the factory. Their website can be difficult to navigate. Earlier today I found single-piston set of rings, but now I can only find full set of rings. Did you call a NAPA dealer? | | | | | Joined: Feb 2004 Posts: 29,769 Kettle Custodian (pot stirrer) | | Kettle Custodian (pot stirrer) Joined: Feb 2004 Posts: 29,769 | This situation is a good reason to do a "cylinder leakdown check" before tearing the engine down. With the piston at top dead center with both valves closed and the crankshaft locked by either putting the transmission in gear and setting the brake or locking the flywheel with a set of vise grips, put air pressure into the cylinder through the spark plug hole. Repeat for all the cylinders. Listen for leakage at the carburetor (intake valve), the tailpipe (exhaust valve), or the oil filler cap (piston rings) Bubbles in the radiator indicate a cracked head or a blown head gasket.
Jerry
"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
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| | | | | Joined: Jul 2012 Posts: 59 Wrench Fetcher | | Wrench Fetcher Joined: Jul 2012 Posts: 59 | Thanks for the help. I'm a newbie and all the help is greatly appreciated. | | | | | Joined: Jul 2012 Posts: 59 Wrench Fetcher | | Wrench Fetcher Joined: Jul 2012 Posts: 59 | I had a cracked head. I had a crack coming from the intake to the exhaust valve on the number 4 cylinder. | | |
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