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Location:
Brisbane
Registered:
October 2002
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how to tell if valve guides are FUBAR'd
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Mon, 01 December 2003 12:33
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hot can i tell when i have the head off, is there a lateral movement test
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Location:
Lost in the K hole
Registered:
May 2002
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Re: how to tell if valve guides are FUBAR'd
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Mon, 01 December 2003 13:16
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yes, in the manual, there should be a tolerance for total lateral mvt of the stem when the valve is at full lift.
alternatively, take it to any machinist, and they can measure the internal valve guide dia with a ball gauge, and check it against wear of the vlave stem - yielding total clearance specs.
fwiw: the toyota guide material is VERY durable, and the allowable tolerance limits are very forgiving. only after maojr trauma or milions of miles should they be so far outta spec that they need replacing.
my 7m, for eg, was within FACTORY tolerances at 220000km, let alone any wear limit. my head builder also said pretty much the same.
cheers
ed
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I supported Toymods
Location:
Australia
Registered:
November 2003
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Re: how to tell if valve guides are FUBAR'd
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Mon, 01 December 2003 13:36
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Don't forget there are external factory that can cause premature wear.
I'm sure overheating, over revving, running low on oil can't help it.
According to the place that did my head, the exhaust guides were gone (I never asked how much, or whatever, in hindsight I should have)
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Location:
Fl
Registered:
February 2003
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Re: how to tell if valve guides are FUBAR'd
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Tue, 02 December 2003 02:50
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If you have the head off and can afford them change the guides for bronze guides. Better for performance and cooling.
Greg
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Location:
Brisbane
Registered:
October 2002
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