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Oyaji_Jon
Roll Me Over


Reged: 11/01/01
Posts: 3269
Loc: Pebble Beach, CA
Re: Cylinder Leak Down Test
      05/19/10 10:38 PM

I did a cold system pressure test following the tester directions and pressurized the system to about 16 psi (the preset test point on the gauge) for a 13 psi system. I dropped about 1/2 psi over a 2 minute time period and repeated the test with the same results 5 times. I started up the truck and let it warm up to normal operating temperature and charged the system to 16 psi again. The instructions said that, if there was a combustion chamber leak, there would be a jumping gauge. There wasn't, and I dropped about 1/2 psi over a 4 minute period with the truck warm. I think this indicates that I have a slow leak between the water jacket and oil galley at the head since I can't find any external leaks. It also makes sense that the leak would slow when warm since the metal of the block and head are expanding and increasing clamping pressure on the gasket.

Does my reasoning make sense? I wonder if I can retorque the head and try to test it again. Thoughts?

Thanks.

--------------------
73
-Jon
KJ6GVM

As seen on Expedition with TX plates: VEGETARIAN - An old Indian word for poor hunter

Grampa's Trooper
1974 FJ40
1987 FJ60

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Entire topic
Subject Posted by Posted on
* Cylinder Leak Down Test Oyaji_Jon 05/14/10 11:15 PM
. * * Re: Cylinder Leak Down Test 52degreesModerator   05/15/10 11:17 AM
. * * Re: Cylinder Leak Down Test fasteddy   05/15/10 11:37 AM
. * * Re: Cylinder Leak Down Test 52degreesModerator   05/15/10 01:41 PM
. * * Re: Cylinder Leak Down Test Oyaji_Jon   05/15/10 09:53 PM
. * * Re: Cylinder Leak Down Test 52degreesModerator   05/15/10 11:28 PM
. * * Re: Cylinder Leak Down Test Oyaji_Jon   05/16/10 12:58 AM
. * * Re: Cylinder Leak Down Test engnbldr   05/16/10 10:34 AM
. * * Re: Cylinder Leak Down Test Oyaji_Jon   05/16/10 12:27 PM
. * * Re: Cylinder Leak Down Test fasteddy   05/16/10 06:04 PM
. * * Re: Cylinder Leak Down Test Oyaji_Jon   05/16/10 09:57 PM
. * * Re: Cylinder Leak Down Test fasteddy   05/17/10 12:12 AM
. * * Re: Cylinder Leak Down Test justice   05/17/10 12:01 PM
. * * Re: Cylinder Leak Down Test Oyaji_Jon   05/17/10 12:48 PM
. * * Re: Cylinder Leak Down Test justice   05/17/10 01:52 PM
. * * Re: Cylinder Leak Down Test Oyaji_Jon   05/19/10 02:48 AM
. * * Re: Cylinder Leak Down Test kewlynxModerator   05/19/10 03:20 AM
. * * Re: Cylinder Leak Down Test Oyaji_Jon   05/19/10 10:22 AM
. * * Re: Cylinder Leak Down Test Grasscat   05/19/10 01:47 PM
. * * Re: Cylinder Leak Down Test Oyaji_Jon   05/19/10 04:11 PM
. * * Re: Cylinder Leak Down Test JohnnyBfromPeoria   05/19/10 04:43 PM
. * * Re: Cylinder Leak Down Test 52degreesModerator   05/19/10 04:29 PM
. * * Re: Cylinder Leak Down Test Oyaji_Jon   05/19/10 05:43 PM
. * * Re: Cylinder Leak Down Test Oyaji_Jon   05/19/10 10:38 PM
. * * Re: Cylinder Leak Down Test 52degreesModerator   05/20/10 03:52 PM
. * * Re: Cylinder Leak Down Test Oyaji_Jon   05/20/10 05:11 PM
. * * Re: Cylinder Leak Down Test fasteddy   05/20/10 11:37 PM
. * * Re: Cylinder Leak Down Test Oyaji_Jon   05/21/10 12:51 AM
. * * Re: Cylinder Leak Down Test fasteddy   05/21/10 11:35 AM
. * * Re: Cylinder Leak Down Test 52degreesModerator   05/21/10 01:59 PM
. * * Re: Cylinder Leak Down Test fasteddy   05/21/10 10:06 PM
. * * Re: Cylinder Leak Down Test Oyaji_Jon   05/22/10 12:38 AM
. * * Re: Cylinder Leak Down Test Oyaji_Jon   05/23/10 01:23 AM
. * * Re: Cylinder Leak Down Test kewlynxModerator   05/23/10 10:38 PM
. * * Re: Cylinder Leak Down Test Adam FModerator   05/23/10 10:55 PM
. * * Re: Cylinder Leak Down Test Oyaji_Jon   05/24/10 01:01 AM
. * * Re: Cylinder Leak Down Test fasteddy   05/24/10 01:06 AM
. * * Re: Cylinder Leak Down Test Oyaji_Jon   05/24/10 01:14 AM
. * * Re: Cylinder Leak Down Test Oyaji_Jon   05/28/10 08:17 PM
. * * Re: Cylinder Leak Down Test JohnnyBfromPeoria   05/19/10 02:15 PM
. * * Re: Cylinder Leak Down Test fasteddy   05/19/10 03:12 PM
. * * Re: Cylinder Leak Down Test Adam FModerator   05/19/10 12:34 PM
. * * Re: Cylinder Leak Down Test StockRaider   05/15/10 02:05 AM

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