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Repair & Maintenance Tutorials (DIY) This sub forum is to help newbies or veterans on basic repairs and maintenances. If you have repair tutorials please post them here.

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Old 06-23-2010, 02:11 PM
Bighen Bighen is offline
Join Date: Jun 2010
Location: Flint Mi USA
Posts: 2
Default how do you repair a cylinder with low compression

can someone send me a diagram on a cylinder head for a 91 ls 400. How can you repair a cylinder with low compression?

Last edited by JBrady; 01-16-2011 at 11:37 AM.
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Old 12-04-2010, 01:49 PM
XR8tt's Avatar
XR8tt XR8tt is offline
Join Date: Jul 2007
Location: Sydney Australia
Posts: 2,760

You've got a combustion leak..
It's either a leaking head gasket.. Or through the valves.. One way to check if it's down through the rings, is to squirt about 5 or 6 cc [teaspoon] through spark plug hole. Turn engine over a couple of times.. Then check compression.. If it rises alot it's leaking down through rings..
Check to see there is a tight valve clearance holding the valve open ??
Check clearance when lobe on the cylinder is facing up...
When capacity isn't enough?
Forced induction....
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Old 02-13-2011, 02:34 AM
sideshow sideshow is offline
Join Date: Aug 2003
Location: Qld
Posts: 2,404

goto your local auto parts shop and buy a can of compression
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Old 02-13-2011, 04:48 AM
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samsdad samsdad is offline
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Join Date: Aug 2008
Location: Perth WA
Posts: 557

Originally Posted by sideshow View Post
goto your local auto parts shop and buy a can of compression

I sent the work experience boy off once for a tin of compressed air.. He came back with a Truck air tank. Later sent the same guy out for a long weight. He went across the road to the pub and won $700 on the pokies and took us all out for dinner. I later suggested to the boss that we should see if he could get a skyhook. My workmate got all upset as he knew someone that did get one (a sky hook). That person that got one was me and my boss (at the time) was not too impressed with the big bill from Sikorsky Helicopters.. I got him a hook from a Sky Crane helicopter...10K USD thank you at the time..

On subject you either have a burnt valve or rings gone.. Time to freshen the motor up
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