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Pastimes : Car Nut Corner: All About Cars
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To: c.r. earle who wrote (153)12/11/1998 12:02:00 PM
From: Greg from Edmonton  Read Replies (1) of 5787
 
Did either service station perform a leak-down test?

A leak-down test is a static pressure test of a cylinder, where a compression test is a dynamic test which can involve other factors.

A leak-down test for each cylinder is far more accurate than a compression test because it does not rely on the battery condition, engine cranking time, or cam profile.

When properly done, a mechanic can diognose wether any sealing problems are caused by worn piston rings, intake valves, or exhaust valves. If air leakage can be heard in the engine intake or exhaust during a leak-down test, then the leakage is occuring at the valves. If air leakage is present but not heard at intake or exhaust valves then it's likely worn piston rings.
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