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Exhaust manifold on the fhead 4
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In the last message I mentioned the excellent phone support from Rustoleum concerning their high temperature paint, where they wanted to make a paint job work, but causing a domestic issue with use of the home oven for car work. was not recommended.
I "got to looking" at the manifold, and noticed that the surfaces that faces the engine,? where the gaskets cover up the sins, were pretty corroded/rusted, and on cyl #4 the manifold had eroded away enough to make the gasket surfaces quite narrow, with pitted
areas elsewhere.?? A friend suggested taping sandpaper to the workbench and going at it to renew the surface.? YouTube provided someone that used 60 grit 3M wet/dry? paper,? (amazed to find it at True Value)? 3 pieces, attached with two sided tape top and
bottom to a flat surface for the work.? Sanded wet; I wore out three sheets, bought some more paper, sanded another hour,? and called it good.? My expert adviser said I needed to be within .020" of an inch compared to flat; I measured .010".? I think I sanded
off over 1/8".? #4 is now nearly as wide as original, mostly it looks like a new surface, pits and rust gone,? a big improvement.?? I spent a few minutes today sanding out the scratches with 220 grit paper.
It is now possible to get new manifolds for this engine, but who knows how good they are, etc.?
Good project for arm exercise on a very rainy day.?
Dan
-- Dan 53 2wd Wagon Eugene, OR |
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That's the sort of thing your local machine shop could have done for you, but the exercise was good for you. ;o)
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On 5/8/2024 7:41 PM, Dan M wrote:
... --
John <jkohnen@...> We don't stop playing because we grow old; we grow old because we stop playing. (George Bernard Shaw) |
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Dan,
It's good to hear you repaired your old manifold yourself.? I had the same problem with an exhaust casting (just one side for some reason) on our '76 F250 with the huge 460 engine.? The casting had warped markedly as apparently many do.? Of course, the life of an exhaust manifold contains more torture than can be suffered at the hands/mouths of relatives... and for a longer time in many cases!? I know what it's like repeatedly getting hot under the collar and cooling off...? If you have to remove about 1/8" on the next example you encounter, what about using a belt sander first and finishing up "by hand" as you did.? It is becoming difficult to find shops that will take on this type of work at a reasonable price, or at all, especially if you live in a big city. Pavel up North. ps: talking about city auto shops... I needed to get the antifreeze/coolant replaced on our old Volvo and so took it to a Toyota dealership only 2 city blocks from where we live here in Vancouver.? Imo, this is not a difficult job.? Their sign boldly states "All Make Service".? The service manager said they couldn't do the job.? Looking at the car he said, "Why bring it here?? Why not take it to a BMW dealer?"? It was my fault of course, being lazy never pays and perhaps Toyota uses different coolant from Volvo - did the job myself and even got a hug from the Mrs. |
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Pavel,
A belt sander would be great for this, I think.? The one I have is too short to reach the ends of the manifold, and in the "don't really screw it up" department, hand sanding allowed me to keep things flat, and to not remove too much material.?
Dan
From: [email protected] <[email protected]> on behalf of willyswagon230 <pavelb@...>
Sent: Friday, May 10, 2024 9:03 AM To: [email protected] <[email protected]> Subject: Re: [WillysTech] Exhaust manifold on the fhead 4 ?
Dan,
It's good to hear you repaired your old manifold yourself.? I had the same problem with an exhaust casting (just one side for some reason) on our '76 F250 with the huge 460 engine.? The casting had warped markedly as apparently many do.? Of course, the life of an exhaust manifold contains more torture than can be suffered at the hands/mouths of relatives... and for a longer time in many cases!? I know what it's like repeatedly getting hot under the collar and cooling off...? If you have to remove about 1/8" on the next example you encounter, what about using a belt sander first and finishing up "by hand" as you did.? It is becoming difficult to find shops that will take on this type of work at a reasonable price, or at all, especially if you live in a big city. Pavel up North. ps: talking about city auto shops... I needed to get the antifreeze/coolant replaced on our old Volvo and so took it to a Toyota dealership only 2 city blocks from where we live here in Vancouver.? Imo, this is not a difficult job.? Their sign boldly states "All Make Service".? The service manager said they couldn't do the job.? Looking at the car he said, "Why bring it here?? Why not take it to a BMW dealer?"? It was my fault of course, being lazy never pays and perhaps Toyota uses different coolant from Volvo - did the job myself and even got a hug from the Mrs. -- Dan 53 2wd Wagon Eugene, OR |
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