The Ford Barn - View Single Post - Compression Problem Revisited - Update

RichPA · 03-10-2012, 10:41 PM

Leak down tests should be done with the piston at top dead center at the top of the compression stroke for that cylinder.The rotor should be pointing at that plug wire terminal, if not turn it one revolution. The valves will be nowhere near opening and exact TDC will prevent the air from pushing the piston down.Since cylinder bores wear at the top this is the best position to see if the rings leak.

03-10-2012, 10:41 PM	#7
RichPA Senior Member Join Date: Sep 2010 Location: rowland PA Posts: 186	Re: Compression Problem Revisited Leak down tests should be done with the piston at top dead center at the top of the compression stroke for that cylinder.The rotor should be pointing at that plug wire terminal, if not turn it one revolution. The valves will be nowhere near opening and exact TDC will prevent the air from pushing the piston down.Since cylinder bores wear at the top this is the best position to see if the rings leak.