 Cylinder leakdown tester, Simple question |
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| Cevan |
 Jul 1 2008, 12:50 PM
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#1
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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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| Cevan |
Jul 3 2008, 04:37 PM
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#2
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Senior Member Group: Members Posts: 1,079 Joined: 11-December 06 From: Western Massachusetts Member No.: 7,351 |
Quick update: I noticed that the leakdown gauge was getting pegged (0% leakdown) when I had only 15 psi into the cylinder. So I replaced the leakdown gauge with a regular 100 psi gauge. I tested the gauge by putting 100 psi to the gauge and both needles swept to max together.
So I warmed up the motor, connected the gauge, added 100 psi to the cylinder and the leakdown gauge read 97 psi. The other three cylinders read 97, 96, and 95. Now I know that's not a race motor sitting in there, so I think I'm still without useful data on this motor. Maybe the PO before the guy I bought it from had just rebuilt the motor and it's got no miles on it. (IMG:style_emoticons/default/confused24.gif) |
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| VaccaRabite |
Jul 3 2008, 05:45 PM
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En Garde! Group: Admin Posts: 13,765 Joined: 15-December 03 From: Dallastown, PA Member No.: 1,435 Region Association: MidAtlantic Region 
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QUOTE(Cevan @ Jul 3 2008, 06:37 PM)  So I warmed up the motor, connected the gauge, added 100 psi to the cylinder and the leakdown gauge read 97 psi. The other three cylinders read 97, 96, and 95. Now I know that's not a race motor sitting in there, so I think I'm still without useful data on this motor. Are you sure it said 97 PSI? The leak down dial is a percentage, as in 97% leak (goal being under 20%). In general, 0 = no leak at all. 100 means there is no seal at all. If you really have leak numbers in the high 90s, and the gauge is not broken, then there are issues. I have to think that the gauge is wrong, as I don't even thing the engine would run with that high amount of leak... If the leak gauge is reading 97 PSI, that tells you nothing. Zach |
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| Cevan |
Jul 3 2008, 06:12 PM
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#4
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Senior Member Group: Members Posts: 1,079 Joined: 11-December 06 From: Western Massachusetts Member No.: 7,351 |
QUOTE(Vacca Rabite @ Jul 3 2008, 07:45 PM) QUOTE(Cevan @ Jul 3 2008, 06:37 PM) So I warmed up the motor, connected the gauge, added 100 psi to the cylinder and the leakdown gauge read 97 psi. The other three cylinders read 97, 96, and 95. Now I know that's not a race motor sitting in there, so I think I'm still without useful data on this motor. Are you sure it said 97 PSI? The leak down dial is a percentage, as in 97% leak (goal being under 20%). In general, 0 = no leak at all. 100 means there is no seal at all. If you really have leak numbers in the high 90s, and the gauge is not broken, then there are issues. I have to think that the gauge is wrong, as I don't even thing the engine would run with that high amount of leak... If the leak gauge is reading 97 PSI, that tells you nothing. Zach The leakdown gauge has a range from 0 to 100 psi gauge. It read 97 psi, so with 100 psi on the left gauge, that would be a 3% leakdown. It's my understanding that 3% leakdown is extremely low, something you'd find in a race motor. |
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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 Vacca Rabite Neither of the HF units I had worked that way, but... Jul 3 2008, 06:17 PM SLITS What he said is that he replaced the % leakdown ga... Jul 3 2008, 06:32 PM Cevan
What he said is that he replaced the % leakdown g... Jul 3 2008, 06:38 PM ArtechnikA
Is 3% to 5% realistic on a '74 2.0 of unknown... Jul 3 2008, 06:53 PM Vacca Rabite
What he said is that he replaced the % leakdown g... Jul 3 2008, 09:37 PM |
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