Manifold Leak?
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5th Wheeling
Joined: Mar 2018
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Manifold Leak?
My ‘78 F-150 has exhaust manifold leaks on both sides, and I know this for certain. My question is, when the truck is in park or neutral and revved, it sounds nice and smooth, but when the engine is under load and going down the road, I hear a “putt” noise. Would leaky exhaust manifold gaskets be more noticeable under load or am I looking at another issue?
More Turbo
Joined: Jun 2015
Posts: 581
Likes: 113
From: New Hampshire
My ‘78 F-150 has exhaust manifold leaks on both sides, and I know this for certain. My question is, when the truck is in park or neutral and revved, it sounds nice and smooth, but when the engine is under load and going down the road, I hear a “putt” noise. Would leaky exhaust manifold gaskets be more noticeable under load or am I looking at another issue?
And yes the leaks will be more pronounced under load.
remove your manifolds and have them resurfaced FLAT at a machine shop. Cost me $20 and it was worth it. Machine shop did it in 30 minutes while I waited.
buy the Remflex gaskets for your truck. Was like $35 on line.
buy new exhaust donuts. Another $15. Make sure your exhaust pipes are flanged properly and sleeved to accept the donut and match up to your manifolds.
reinstall the manifold with the Remflex gaskets and DO NOT over tighten. You can go back daily for the first week and slightly retighten.
enjoy the sound of no exhaust leak.
tbruz
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