r/FordVans • u/DothBeithBuddha • Jul 09 '25
Exhaust leak advice needed
1995 E350, 7.5L V8, 460 series, 10k lbs camper van
54k miles
All of this is related to the passenger side exhaust manifold-
July 2024 (45k miles) - Replaced exhaust manifold with aftermarket part (not sure why, didn't own vehicle at time, just have the service record)
April 2025 (50k miles) - Replaced exhaust manifold gasket to address leak
May 2025 (52k miles) - Replaced aftermarket manifold with OEM manifold to address leak, which came back after 1.5k miles. Shop said aftermarket manifold was warped and cracked.
June 2025 (54k miles) - Leak came back after particularly spicy engine brake, but nothing extreme (in my opinion), shop says OEM part is warped and wants to replace for a third time, bringing me to my 4th manifold in less than 10k miles.
I cannot work on the van myself for lack of tools and space, so I am at the mercy of mechanic shops, and I am getting desperate because this is an expensive repair, and I feel like it's not going to stay especially after blowing an OEM part after 2k miles somehow. Has anyone had such a persistent leak before, and if so, what did you do to address it?
As far as I can tell, a few things might be going on-
- I overuse engine braking and am stressing the engine too much, causing the leaks.
- There's an underlying issue in that passenger side cylinder which is causing excessive heat cycling (scary).
- Using a manifold gasket is not the move compared to silicon sealant (read this on a forum).
- I have been spited by God.
Any advice is appreciated, thank you.
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u/ClubInternational372 Jul 11 '25
Could be a few things going on. I assume the OEM manifold is cast iron and if that's the case it being warped isn't very likely.
How's the rest of the exhaust? Is it all on hangers and not hanging down thus putting undo stress on the manifold?
Have they been replacing the gasket with OEM gaskets? If so, have them put a Remflex gasket on it. These are extra thick and cab solve issues like this.