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Picked a $40 HF compression tester over renting the AutoZone one for my '72 Dart, and the cheap one actually held pressure
Took the Dart out to a buddy's garage in Mesa to chase down a miss, and the parts store rental leaked so bad I couldn't get a real number, while the $40 one from Harbor Freight sealed up first try and showed me cylinder 6 was down 30 psi, so has anyone else had a rental tool burn a whole Saturday?
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sarahpatel11d ago
That Harbor Freight tester has one thing going for it that nobody talks about, which is the o-ring on the hose end. The rental ones get beat to death by every dude in a 50 mile radius cranking them into hot plug holes with a 3 foot breaker bar. By the time you rent it the seal is chewed up and hard as a rock, so of course it leaks. The trick with the cheap HF unit is to put a dab of grease on that o-ring before you thread it in and don't gorilla it, just snug. Mine held 150 psi on a 302 with 200k on it and matched what my machinist's Snap-On gauge read within 5 psi. 30 psi down on cylinder 6 on a 318 or 225 though, that's worth a leakdown test before you pull the head, could just be a burnt valve and not rings.
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