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Registered:
May 2002
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Location:
Terrigal
Registered:
May 2002
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Re: What is a Compression and leak down test
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Tue, 12 April 2005 23:06
 
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Compression test is just that, tests the compression of the engine. So how well the rings/valves are sealing the combustion chamber.
Leak down test is handy if you have low compression. You can tell if its the rings or valves that is allowing the engine to loose compression.
Most mechanic workshops should be able to do it, can't imagine it being more than $50.
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Registered:
May 2002
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Re: What is a Compression and leak down test
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Tue, 12 April 2005 23:17
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Cool thanks mate
apparently lube mobiel do it too !
how long would it generally take?
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Location:
Adelaide
Registered:
September 2003
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Re: What is a Compression and leak down test
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Wed, 13 April 2005 00:05
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for 40 bucks you could buy a compression tester. and do it yourself, if you have low compression in a cylinder after doing a test you can find out if it is the rings or valves by putting in a small amount of oil.
anyway method is
buy compression tester.
pull sparkplugs out (keep them in the same spot so you can examine if the sparkplugs are alright for the cylinders)
disconnect ignitoin so it doesn't spark unwantedly everywhere.
put compression tester in cylinder
open throttle wide open
crank engine over for about 5 or so seconds
let go of throrrtle, check reading on guage.
repeat for other cylinders, and they should all be within about 5% of each other.
if one is low then pour about a teaspoon of oil in the cylinder and re run the compression, if it significantly goes up then rings are on way out, if it is still low then valves are the issue.
go on buy one, you know you want to.
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Location:
Adelaide
Registered:
September 2003
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Re: What is a Compression and leak down test
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Wed, 13 April 2005 00:07
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and if a group of cylinders is lower than some other cylinders then it might be head gasket related
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Registered:
May 2002
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Re: What is a Compression and leak down test
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Wed, 13 April 2005 01:20
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$70 down the road .. save me the hassle
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What is a Compression and leak down test
