1956 OMC 15HP Crank Seal

This topic has 14 replies, 5 voices, and was last updated 2 years, 7 months ago by olcah.

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February 16, 2023 at 11:54 pm #272811
dave-bernard
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wouldn’t there be a leak between the sleave and crank. just asking.
February 17, 2023 at 6:07 am #272812
olcah
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Dave,

Yes, although the sleeve fit can be fairly tight. With some OMC sealant and the usual oily gloop from the running the motor it may be sealed. I am more concerned with the welding. Don’t know what the crank material is – nodular iron? Would that weld ok to plain steel?
February 17, 2023 at 10:42 am #272816
dave-bernard
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maybe J-B Weld would be better. I don’t know.

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olcah
February 17, 2023 at 3:20 pm #272829
frankr
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How about another suggestions How about finding a seal that will fit directly on the reduced crankshaft diameter? You could fabricate a press-fit spacer ring of aluminum to go between the seal and crankcase bore, if necessary.

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olcah
April 3, 2023 at 10:03 pm #274765
olcah
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A Pine Tree member provided me with another 15 HP powerhead and it has the factory ring in the lower seal area. It is still in place and must be stainless steel as it is still shiny. I will use that crankshaft and hope the ring remains in place as it has since 1956. Notice the photo shows the interface between the factory ring and the crankshaft.
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