vaccum test
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Mountain Pass
Joined: Jan 2001
Posts: 130
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From: Ozark Arkansas
vaccum test
i did a vacuum test on my truck today. it had a rapid vibration and the book said it could be worn valve guides if it smoked to. but the truck only smokes when you hammer down on it. so could that be the guides if it is how hard are they to replace. can you do it yourself?
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Joined: Nov 2000
Posts: 2,557
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From: Texas
vaccum test
Does it smoke a little when you start in in the mornings? That's an obvious sign of valve guides.
Is the smoke black or grey/white when you mash the gas?
Grey/white is oil and your rings are worn.
Black is a rich carb.
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Is the smoke black or grey/white when you mash the gas?
Grey/white is oil and your rings are worn.
Black is a rich carb.
Krosati
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Postmaster
Joined: Nov 2001
Posts: 3,351
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From: Escondido, CA
vaccum test
Valve guides are best left to a mchine shop. Unless you have access to a head machine or a really really good mill. Besides the machine shop can warranty their work or modify the heads while your having the guides replaced.
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Mountain Pass
Joined: Jan 2001
Posts: 130
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From: Ozark Arkansas
vaccum test
[updated:LAST EDITED ON 19-Jan-02 AT 10:00 PM (EST)]ill do a commpression test when i go back to votech monday. i wondering my number 6 cyl is dead i can pull the wire off of the can and it doesnt change the idle any. the engine is a 351w
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Joined: Apr 2001
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vaccum test
If the compression test is good.150 psi.Then recheck the firing order.It could be wired for a 302.Theres a slight differance in the firing order between the two engines.Post back
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Mountain Pass
Joined: Jan 2001
Posts: 130
Likes: 0
From: Ozark Arkansas
vaccum test
if it was wired for the 302 firing order i didnt think it would run at all. i checked it though it is 13726548.
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Joined: Apr 2001
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vaccum test
The firing order you wrote is for a 351.I didn't even know if you had a v-8 when I responed to your post.I would verify then #1 postion of rotor/cam/piston 1st,then do firing order for whatever engine you have.That would possibly explain why your engine smokes....maybe???I have gotten engines to run with firing orders all jacked up and distribters put in wrong..