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| | | | Joined: Jun 2008 Posts: 325 'Bolter | | 'Bolter Joined: Jun 2008 Posts: 325 | What do you suppose would cause no compression at all? Compression is #1 - 100, #2 - 105, #3 - 102, #4 - 0, #5 - 112, #6 - 105.
From the vacuum gauge I noticed one of the cylinders didn't seem to be firing so I ran a compression test. This seems like a big problem to me. Would it be a broken ring?
The engine is a 216 rebuilt with maybe 1000 miles. The temperature gauge suddenly spiked going up a hill, and then seemed to lack a bit of power. | | | | | Joined: May 2017 Posts: 100 'Bolter | | 'Bolter Joined: May 2017 Posts: 100 | Could be a valve problem,bent push rod, check the valve train out/ You may find the problem fast
!956 Gmc Napco 4x4 Factory line built .
| | | | | Joined: Aug 2012 Posts: 1,214 Shop Shark | | Shop Shark Joined: Aug 2012 Posts: 1,214 | I'll 2nd a valve problem. Either the intake or exhaust valve isn't closing all the way. The valve could be bent and sticking, burnt and not sealing or has some carbon or other material keeping it from closing or adjusted too tight.
Remove the valve cover and go through the valve adjusting procedure on cyl #4.
If that doesn't correct it then do a leak down test on cyl #4 and listen to the exhaust and intake to determine where the air is leaking out.
Good luck
Dave | | | | | Joined: Dec 2003 Posts: 1,061 'Bolter | | 'Bolter Joined: Dec 2003 Posts: 1,061 | Do a dry/wet compression test. If you have the same reading on #4 when it is checked wet, it is your valve. Is there water in the oil? if so it is either a blown head gasket or cracked head.
1946 1-ton Panel
1952 1-ton Comml. W/Grain Body
| | | | | Joined: Feb 2004 Posts: 29,792 Kettle Custodian (pot stirrer) | | Kettle Custodian (pot stirrer) Joined: Feb 2004 Posts: 29,792 | Broken rings usually won't drop the compression all the way to zero. That takes a badly burned or stuck valve, or maybe a hole in a piston. Air pressure at the spark plug hole with the piston near top dead center on the compression stroke will pinpoint the source of the leak. Put the transmission in gear and set the parking brake, or clamp the flywheel to keep the air from turning the crankshaft.
Jerry
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| | | | | Joined: Jun 2008 Posts: 325 'Bolter | | 'Bolter Joined: Jun 2008 Posts: 325 | The exhaust valve was waaaay too tight. Maybe someone accidentally adjusted the exhaust valve to intake specs.
Thanks, problem solved! | | |
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