Valve guides
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Senior User
Joined: Jul 2003
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From: Saskatchewan, Canada
Valve guides
I just bought a 76 F150 with a 460 and it burns oil real badly. It has good compression and there is no smoke when it idles so i am almost sure that the oil is splashing up through the valve guides. My question is what is involved in replacing the guides, and how much will it cost? Or am I totaly off base and it is something else?
Thanx JJ
Thanx JJ
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From: Indiana
jj292
It could be the guides. They will cause oil consumption if they are worn out. The heads will need to come off and be taken to a competent machine shop to fix them. A good valve job, guides, stem seals, hardened exhaust seats, will cost in the area of $350.00.
But it could be the piston rings also.
Do a compression test.
It could be the guides. They will cause oil consumption if they are worn out. The heads will need to come off and be taken to a competent machine shop to fix them. A good valve job, guides, stem seals, hardened exhaust seats, will cost in the area of $350.00.
But it could be the piston rings also.
Do a compression test.
Cargo Master
Joined: May 2001
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The 76 heads will have the hardened valve seats. I would check the rings while I had it down the 460's I have dealt with all had ring problems when they got to using a lot of oil and I mean as high as a quart every 60 miles and neither one would smoke at idle the only time they smoked was when you let off the gas to shift.
Cargo Master
Joined: Dec 2003
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From: Redford, Mi.
When you take the valve covers off see if there are any seals left to prevent the oil from going down the guides. Some new seals might buy you some time, big block 385's will run forever burning oil or not.
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Senior User
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From: Saskatchewan, Canada
The reason I suspect valve guides is that I had the same oil problem with my 292 only much worse about a quart per gallon! The engine ran great had good balanced compression and always started on the first try. But it burned oil bad but not when idaling only when you reved it.
JJ
JJ
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Cargo Master
Joined: Dec 2003
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From: Redford, Mi.
What happens is on decel you get such high vacume it sucks the oil down the guides when there loose. You can take a screwdriver and give them a little pry against the spring and if they are bad you will see a lot of movement.
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jj292
With a motor of that age, it could just as easily be the oil rings are bad ( worn out, stuck, broken ) and the compression rings are still fairly decent. This will let it burn oil like crazy and still have decent compression. I had this same issue on the 400 that was in my 82. It carried great vacuum, had good compression, and burned a quart of oil every 200 miles, and did not smoke for nothing. I did the whole head thing, stem seals and guides, and all I did was waste my time and money. It had some oil rings broken.
But the valve guides in an engine of that age are more than likely shot also.
It probably needs torn down and went through.
With a motor of that age, it could just as easily be the oil rings are bad ( worn out, stuck, broken ) and the compression rings are still fairly decent. This will let it burn oil like crazy and still have decent compression. I had this same issue on the 400 that was in my 82. It carried great vacuum, had good compression, and burned a quart of oil every 200 miles, and did not smoke for nothing. I did the whole head thing, stem seals and guides, and all I did was waste my time and money. It had some oil rings broken.
But the valve guides in an engine of that age are more than likely shot also.
It probably needs torn down and went through.
Last edited by Superdave; Jan 5, 2004 at 02:09 AM.
