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TK in LA · 06-13-2010, 05:54 PM

According to my 1942 Motors Manual, the motor should be at normal operating temperature to allow all the parts to expand to normal running friction. Remove all plugs. With the choke open and the throttle open crank as many times as needed untill the gauge no longer rises. Repeat on the rest of the cylinders. They specify a 5 to 10 lb. variation as suspicious. Two adjacent cylinder with low compression could indicate a blown head gasket. Also if the compression is low in one cylinder, squirt some oil into the cylinder and see if the compression improves. If it does it is probably rings. If it doesn't it's probably valves. Hope this helps?

06-13-2010, 05:54 PM	#3
TK in LA Senior Member Join Date: May 2010 Location: La Verne, Ca. Posts: 826	Re: Compression check procedure? According to my 1942 Motors Manual, the motor should be at normal operating temperature to allow all the parts to expand to normal running friction. Remove all plugs. With the choke open and the throttle open crank as many times as needed untill the gauge no longer rises. Repeat on the rest of the cylinders. They specify a 5 to 10 lb. variation as suspicious. Two adjacent cylinder with low compression could indicate a blown head gasket. Also if the compression is low in one cylinder, squirt some oil into the cylinder and see if the compression improves. If it does it is probably rings. If it doesn't it's probably valves. Hope this helps?