Re: 9.9/15HP T-stat gasket PN? Not on M.E.

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March 23, 2018 at 8:51 pm #72922
Don
Participant

    US Member

    OK, Dan pointed out that I said everything but answer the question posted…
    So
    The gasket on the left, which is the second generation design is: 321387
    The gasket in the middle, which is the third generation design: 329920
    The gasket on the right, which is the first generation (74-76 models) is: 318917
    Again, the 321387 supercedes to the newer gasket: 329920 You can simply trim the little bit of gasket with the extra hole in it back after reassembling the thermostat cover if you like. The main problem on these second generation head/covers is that the lower/port side of the cover is not supported/clamped very well and is subject to leakage, especially after removing/cleaning/resurfacing the parts during thermostat replacement….D