I’ve had my heat exchanger serviced for my MDL4 Onan generator and now it’s time to reinstall. I was given the gaskets that are necessary between the block and the exchange (4 of them), as well as the gasket between the heat exchanger and the riser. The original gasket between the block and the heat exchanger was a metal crush gasket. The new one is fiber. Is it ok to use the fiber gasket or should I search for the original crush gaskets? There was no sealant on the crush gasket. If it’s ok to use the fiber gasket what, if any, sealant should I put on them. I have the same question for the gasket between the heat exchanger and the riser. Thanks for your input.IMG_2835.jpgIMG_2834.jpgIMG_2832.jpg
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01-16-2024 11:02 AM #1Senior Member
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Onan Exhaust Manifold Gasket Sealant
1987 63' CPMY - Jubilee
Tampa, FL
All who wander are not lost.
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Re: Onan Exhaust Manifold Gasket Sealant
The new gaskets will work great, maybe better than the original set.
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01-17-2024 09:16 AM #3Senior Member
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Re: Onan Exhaust Manifold Gasket Sealant
None. Just a clean flat mating surface.
Just a lil drop of anti-size on the screw and bolt threads.
One issue I have with anti-size is the folk who apply it.
Seems to get brushed on, all over the hardware, the engine, the boat and themselves.
I wish it came in a syringe and not a bottle & brush.Last edited by Captain Ralph; 01-17-2024 at 09:32 AM.
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01-17-2024 05:24 PM #5Senior Member
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Re: Onan Exhaust Manifold Gasket Sealant
Can you share a source for the Onan manifold to block gaskets? Same job about to happen on my forward genset…
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01-17-2024 09:06 PM #6Senior Member
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01-17-2024 09:14 PM #7Senior Member
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Re: Onan Exhaust Manifold Gasket Sealant
I had my heat exchanger serviced by Yachts & Diesels out of Ft Lauderdale. It was a very unpleasant experience. I would not recommend them. PM if you want more specific information. Having said that, I believe they "produced" the gaskets in house (ie they cut the gaskets out with some sort of laser type machine).
1987 63' CPMY - Jubilee
Tampa, FL
All who wander are not lost.
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01-18-2024 06:25 PM #9Senior Member
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