 Cylinder leakdown tester, Simple question |
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| Cevan |
 Jul 1 2008, 12:50 PM
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Senior Member  Group: Members Posts: 1,079 Joined: 11-December 06 From: Western Massachusetts Member No.: 7,351  |
I recently acquired another 'teener. See video here.
I have a leakdown tester like the one pictured below. The included instructions are pretty worthless. There is a hose extension that screws into the spark plug hole in the head. The other end connects to the gauge. My question is, do I add air from my compressor and use the regulator on the tool to set the leakdown gauge (on the right) to 0% and then connect it to the piece of hose, or do I assembly everything together and then add air? I tried the latter method and used the regulator to adjust the leakdown gauge to 0% and then it never went down.  |
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| SLITS |
Jul 3 2008, 06:32 PM
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"This Utah shit is HARSH!" Group: Benefactors Posts: 13,602 Joined: 22-February 04 From: SoCal Mountains ... Member No.: 1,696 Region Association: None  |
What he said is that he replaced the % leakdown gauge with a regular 100 psi gauge.
So 100 in, 97 left = 3% leak down ... damn good number. |
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| Cevan |
Jul 3 2008, 06:38 PM
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Senior Member Group: Members Posts: 1,079 Joined: 11-December 06 From: Western Massachusetts Member No.: 7,351 |
QUOTE(SLITS @ Jul 3 2008, 08:32 PM)  What he said is that he replaced the % leakdown gauge with a regular 100 psi gauge. So 100 in, 97 left = 3% leak down ... damn good number. Is 3% to 5% realistic on a '74 2.0 of unknown condition? |
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| ArtechnikA |
Jul 3 2008, 06:53 PM
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#4
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rich herzog Group: Members Posts: 7,390 Joined: 4-April 03 From: Salted Roads, PA Member No.: 513 Region Association: None |
QUOTE(Cevan @ Jul 3 2008, 08:38 PM) Is 3% to 5% realistic on a '74 2.0 of unknown condition? yes - because it is unknown. OTOH, now that you have ~4% it is no longer unknown, and therefore suspect (IMG:style_emoticons/default/smile.gif) Seriously - it is but ONE bit of information. The compression-gauge number is another data point. An engine can have excellent leakdown but bad compression and still be undesirable as a street engine. (One possibility being a high-overlap race cam.) An engine can have good leakdown and -still- need a rebuild if the cam is flat because the lifters went bad. Or - you could have good leakdown because the rings are rusted in place :-) We'll assume that't not the case. (Call it) 4% is good. Take your miracles one at a time and be happy. Put it this way - you're either going to tear the engine down or you're not. I think you'd be silly to tear down a 2,0 914 engine without running it first but be aware there is an argument to be made that the only appropriate thing to be done is tear it down and be sure. That course of action is more work and money, but it does not risk as many broken parts. You roll the dice and live with the consequences. |
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Posts in this topic
Cevan Cylinder leakdown tester Jul 1 2008, 12:50 PM
Racer Chris Make sure the cylinder you are testing is at TDC c... Jul 1 2008, 12:54 PM SLITS That's the $39.00 setup from Harbor Freig... Jul 1 2008, 06:25 PM Jake Raby Ensure the engine is warm and test each cylinder a... Jul 1 2008, 08:25 PM Racer Chris Oh, make sure the crank can't rotate while you... Jul 2 2008, 06:52 AM Vacca Rabite
I have a leakdown tester like the one pictured be... Jul 2 2008, 08:18 AM
Jake Raby
I have a leakdown tester like the one pictured b... Jul 2 2008, 12:12 PM Cevan I know that the HF stuff is not high quality, or e... Jul 2 2008, 12:35 PM ArtechnikA
I figured that if I bought a good one online for ... Jul 2 2008, 05:58 PM vsg914
You can buy a $50 drill press or a $50... Jul 2 2008, 06:34 PM Cevan Quick update: I noticed that the leakdown gauge wa... Jul 3 2008, 04:37 PM Vacca Rabite
So I warmed up the motor, connected the gauge, a... Jul 3 2008, 05:45 PM Cevan
So I warmed up the motor, connected the gauge, ... Jul 3 2008, 06:12 PM Vacca Rabite Neither of the HF units I had worked that way, but... Jul 3 2008, 06:17 PM Vacca Rabite
What he said is that he replaced the % leakdown g... Jul 3 2008, 09:37 PM |
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