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Thanks for the input so far. Liquorice, yeah the Name BMC also made me think of British Motor Company, also the apearance reminds me of the British Lehman engines of old.
celenoglu and Bellatrix1965 changing to a dual pully system is a good suggestion, but it doubles my pully problems for right now. I would have to change the crank/waterpump/and the Alternator pully.
The engine is in a Yorktown39CC, and was built by the Yorktown factory in Long Beach California. They also sold owner completed boats, but this one was a sailaway boat. It sold in 1980.
I Appologize for not listing the boat in my original message. The other thing I would prefer a single pully over a dual is the clearance of the forward bulkhead, it's very tight right now. The engine room is quite large, but the access to the front of the engine is real tight, and you have to be a contortionist to service the front of the engine.
I know someone is going to suggest repower but this engine runs smooth, fairly quiet, doesn't smoke after a warm up, and has very low hours for such a old engine. (All that and I'm a tightwad).
According to the owners manual, the engine was sold by a company in Long Beach Calif. and I tried to call them, but all I get is a busy signal. I think I will try to do an online search for the company.
Again, thanks for your thoughts, If anyone has any ideas, I would appreciate it.