maybe I can cut it myself. where can I buy this type of nitrile sheet?My recommendation is to use a new gasket of you open it up. Why risk reusing th old one? The gasket is probably a piece of 1/16" nitrile sheet ( also called Buna-N) which you can easily cut yourself.
If the sealing surfaces are smooth, no sealant is necessary. Use Permatex aviation sealant if you must.
This is my personal preference - you will get lots of differing recommendations!
BTW, I agree with opening up the heat exchanger.
Thanks. neoprene does offer some low cost options. egNitrile, aka Buna-n, aka NBR is a good quality material to use for gaskets that are asked to resist oil or ethylene glycol at reasonable temperatures. If you want to step up in performance look to Viton or Teflon.
In this application you are sealing raw (salt, polluted) water at low temperatures and pressures. Neoprene, or cork/rubber sheet would work just fine.
Fel-Pro makes a number of suitable gasket materials that should be readly available on Amazon or ebay.
If you just have to have NBR (nothing wrong with that) Mcmaster Carr may be a reasonable source.
You can´t make a neat hole through rubber (nitrile) sheet with a drill. You should use a gasket punch. A larger hole can be made by hand with an X-acto knife if you are careful. For 3/8 bolt, make a 3/8 hole (the material is flexible).What size drill bit should be used to make the center hole in the gasket?
Thanks. I have sent the pictures of the HE to Sen-Dure for confirmation.The small rubber washer is called a gum washer. Have a look at the lower right corner of page 5 of the Sen-Dure link in Post #19.
It is likely a Sen-Dure cooler.
If you use anything metal like a gun cleaning rod, coat hanger, welding rod, etc, you risk damaging the tubes. Wooden dowels swell up and are difficult to use. Best is a plastic ros slightly smaller than the id of the tube. McMaster-Carr has 3 foot lengths that are perfect. Don't remember the diameter but they're cheap enough that you can order several to get the right fit.There will be more elegant solutions but rodding with a length of wire cut from a simple wire clothes hanger should help.
Brian and American Diesel should be able to help you with replacement gaskets. We just ordered some for our 1992 GC 35 with Lehman 135s. 804-435-3107I removed both end caps. The gasket on the forward side is already warped. Is it due for replacement?
The part no of the gasket is 2d25, where can I purchase it?
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The aft gasket is still flat.
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Here is the inside of the forward cap.
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The aft cap
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The manual says to use 3/16 wood dowel to clean the tubes with twisting actions. But some holes are already plugged partially by calcium so the dowel may not fit in. How to clean these tubes?