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Location:
northern beaches
Registered:
June 2002
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4age compression check
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Wed, 01 January 2003 07:10
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Hey guys - I was wondering if any of you have taken the engine oil filler cap off when the car is idling. My car seems to have a shit load of air coming from there, and oil leaks around the rocker cover seal. I know this is probably from the blow by gases but it seems excessive. I did a compression check and the first 2 cylinders were 225Psi each and the second 2, 200 psi each. The first 2 are above what the manual suggests (carbon build up??). Do these motors have a tendancy to blow headgaskets?
Thanks
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Club Member
Location:
sydney
Registered:
May 2002
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Re: 4age compression check
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Wed, 01 January 2003 07:20
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Generally they dont blow a head gasket unless they have been badly neglected or abused, the 4A is quite a strong package, however oil leaks around the rocker cover are fairly common and can be easily fixed by replacing the rubber seals.
The 4AG's do get quite a bit of blow by as they age although youre compression does seem a bit higher than the norm, just make sure theres no signs of a blown gasket or gas leak to the radiator and that the oil is regularly changed..if youre not having any problems and the cars running fine then I wouldnt worry too much about the high numbers.
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Location:
Tasmania
Registered:
May 2002
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Re: 4age compression check
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Wed, 01 January 2003 10:50
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Realisticaly, alot of engines have about 150psi or 1000Kpa. If all 4 are that value, its a good motor. Your text book may say about 170psi for a new motor, and minimum of 145psi for a old motor. Many motors will run happy at 120psi, as long as all cylinders are worn evenly.
It is unusual to get a reading higher than the manual says, unless you have rebuilt with higher static compression. Check your gauge again.
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I supported Toymods
Banned User
Location:
Brisbane
Registered:
May 2002
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Re: 4age compression check
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Wed, 01 January 2003 12:45
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A little off topic but what is a compression tester worth? Can you use them on engines that have the spark plugs down long tubes? Like the 2T and late model 3S?
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Location:
Tasmania
Registered:
May 2002
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Re: 4age compression check
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Wed, 01 January 2003 13:50
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My Kinchrome tester was about $95, and came in a case with adapters to fit down any plug tube. I had to have the gauge replaced a few times under warrantee. A compression test is the quickest way to determine how much a job is going to cost the customer, and should be included in every "tune up". Every mechanic needs one.
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I supported Toymods
Banned User
Location:
Brisbane
Registered:
May 2002
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Re: 4age compression check
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Thu, 02 January 2003 00:23
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I just wanted one to give the engine in the halfcut i'm getting a quick test!
Dont happen to have the part number for that one you have do you?
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