SR LEAKDOWN TEST

[wangan_cruiser]

ok i did a leakdown test just now and i didnt hear any hissing sound coming out from nowhere.

heres how i did it.

i set my compressor to 80psi i think the fsm says 90 psi. so i tested it it out even at 80psi i should get any leak even with 10 psi difference. i grab my compression tester hose and screwed it in to the sparkplug hole then i connected the air compressor to the compression tester hose. i left it there and let it sit for 2 mins and i didnt hear any hiss. then i went to check the outlet pressure gauge of the air compressor it stayed in 80psi for all cylinders.

QUESTION IS DID I DO IT RIGHT? ANYONE CAN SHOW ME THE RIGHT WAY?

thanks

[Rucca]

I can't really understand you. Anyway, you are referring to a compression tester? You mean leakdown I guess. Here is how you do it:

Warm up the car set compressor to 90psiStart at cylinder #1 - it needs to be TDC on compression. Verify by looking at the dist rotor pointing at cyl 1 and harmonic balancer on 0. This is important that you are on compression and also at the very top of the stroke. If not, when you apply air to the cylinder it will force the piston down and the test won't work.Install the spark plug adapter hoseHook the leakdown tester to the air compressorAdjust the knob on the leakdown tester to zero it outNow, hook the leakdown tester to the spark plug adapter hoseAt this point you'll either hear whoosh and you have to find TDC again or you did it correctlyAssuming you did it correctly #1 record the leakdown percentage. You want under 10% leakdown. You will always be able to listen into the dipstick and crankcase and hear a hissing. This is normal blow by. Listen at the radiator cap and look for bubbles here: these would indicate headgasket problems or cracks in head/block. Listen at exhaust pipe: hissing hear indicates burnt non seating exhaust valves. Listen at the throttle body: hissing hear indicates intake valves not properly seating.

Now do the rest of the cylinders in firing order. That assures that the next one to rise is on compression