There's been a lot of posts that I've read over the time that says: Do a leakdown Test and get back to us.
Compression test tell you how high compression will go hopefully 90 psi are above is good after 120 psi and above there can be problem valve train like compression release this is notice when reading around 160 are above.
Leakdown test to see how well engine hold pressure by using aircompressor leakdown tool have orfis so incoming air be about same as normal ring gap leakby.
Two gauges one measure incoming air pressure other how much leak off the persent shouldbe no more than 30% off incoming air you hear are see a leak above 20% like coming out muffler that exhaust valve coming in carb that intake valve leaking are from head gasket leak to outside are bubbles in coolant if water cooled. Crankcase venting to much air ring or piston leaking.
0 to 20 % give you life range for engine like 18% you got one more season with that engine then overhaul are trade time.
I use compression testor and 3 of my 5 sences to tell me how read parts on teardown. Leakdown test just reverse of compression test so why not use faster compression tester.
Which leakdown tester to buy start out one harbour freight unless in engine rebuilting business then get one with better guages and valves so be lifer. If do warranty work you need leakdown tester if don't you don't.
Some people helping other on internet beenfit with leakdown test report. Greem zone is 0 to 20%
Compression test tell you how high compression will go hopefully 90 psi are above is good after 120 psi and above there can be problem valve train like compression release this is notice when reading around 160 are above.
Leakdown test to see how well engine hold pressure by using aircompressor leakdown tool have orfis so incoming air be about same as normal ring gap leakby.
Two gauges one measure incoming air pressure other how much leak off the persent shouldbe no more than 30% off incoming air you hear are see a leak above 20% like coming out muffler that exhaust valve coming in carb that intake valve leaking are from head gasket leak to outside are bubbles in coolant if water cooled. Crankcase venting to much air ring or piston leaking.
0 to 20 % give you life range for engine like 18% you got one more season with that engine then overhaul are trade time.
I use compression testor and 3 of my 5 sences to tell me how read parts on teardown. Leakdown test just reverse of compression test so why not use faster compression tester.
Which leakdown tester to buy start out one harbour freight unless in engine rebuilting business then get one with better guages and valves so be lifer. If do warranty work you need leakdown tester if don't you don't.
Some people helping other on internet beenfit with leakdown test report. Greem zone is 0 to 20%
