 Leak down testing help |
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| tornik550 |
 Sep 13 2010, 08:12 PM
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Senior Member  Group: Members Posts: 1,248 Joined: 29-January 07 From: Ohio Member No.: 7,486 Region Association: None  |
My engine was recently rebuilt and had about 250 miles on it. I was having some issues with cylinder number 3 and I needed to remove the engine.
My buddy gave me a harbor freight leak down tester and I decided to play with it. I do not have the head on cyl 3,4 so I played with cyl 1,2. I have never used a leak down tester. I realize that the engine should be warm however I cannot warm the engine since the other half is out of the car and I cannot wait to play with my new toy until the engine is back in. Here is what I did and the results (I should mention that I was getting good compression numbers from cyl 1,2,4 prior to pulling the engine)- I set cyl 2 at TDC (also had the rockers removed so TDC probably doesn't matter). Hooked up the hose to the spark plug hole Hooked up the gauge section of the tester to the air hose, turned the gauge until the leakage gauge reads 0% (the other gauge read at around 10 psi?) Then I hooked the coupler up to the hose from the spark plug hole Read the gauge- 35% Did the same thing with cyl 1- same results 35% Just to play around, I decided to leave one of the valves open. I thought it would read 100% leakage- it read 35%- WTF. It seems that I am not doing something right. Is this simply because the engine is cold? ALso- Bonus question- How can I tell if my cylinders are glazed? I figure that now is a good time to find out so I can get them honed if necessary. THanks!!!! |
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| tornik550 |
Sep 14 2010, 08:33 PM
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#2
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Senior Member Group: Members Posts: 1,248 Joined: 29-January 07 From: Ohio Member No.: 7,486 Region Association: None |
After reading a bit online about leak down testers and specifically the HF leak down tester. It appears that the leak down tester from harbor freight is made incorrectly. The leakage gauge is only setup to do a compression test between 10-15psi- even though the box and pressure gauge says 100 psi. So bottom line- worthless. I was able to fix it though. I had a 100 psi gauge laying around. I unhooked the leakage gauge and hooked up a 100 psi gauge. It now works perfectly.
I redid the leak down test with my new setup. I got 7 psi leakage from cyl 1 and 2. Much better. |
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Posts in this topic
tornik550 Leak down testing help Sep 13 2010, 08:12 PM
messix glaze??
look for galling, long scuff marks from ... Sep 13 2010, 09:06 PM john rogers There are lots of things that can affect leakdown ... Sep 13 2010, 11:28 PM messix i really don't think you can trust a leak down... Sep 13 2010, 11:44 PM tornik550 I think that my results are not very useful since ... Sep 14 2010, 07:00 AM SLITS I have one ... never seems to read correctly I gue... Sep 14 2010, 07:35 AM Vacca Rabite I owned a HF leak tester for about a week. It was... Sep 14 2010, 09:13 AM
tornik550
I owned a HF leak tester for about a week. It wa... Sep 14 2010, 09:23 AM Vacca Rabite Nope just the big knob.
10PSI is not enough press... Sep 14 2010, 09:27 AM tornik550
Nope just the big knob.
10PSI is not enough pres... Sep 14 2010, 09:35 AM Vacca Rabite
Nope just the big knob.
10PSI is not enough pre... Sep 14 2010, 10:40 AM Vacca Rabite Check this out:
http://cgi.ebay.com/ebaymotors/DUA... Sep 14 2010, 10:45 AM Vacca Rabite Good on you!
Now, what did Cyl 3 say?
Zach Sep 15 2010, 07:35 AM tornik550
Good on you!
Now, what did Cyl 3 say?
Zach
... Sep 15 2010, 07:49 AM Vacca Rabite D'oh!
Zach Sep 15 2010, 07:54 AM |
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