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  1. fastempo

    RPM too high at WOT

    Re: RPM too high at WOT Thank you all for all the input and advise. Presently the boat is bundled up and wrapped for the long trip to MO/ARK, which I'm embarking on in a couple of days, so I can not take it out on the water for further testing until I arrive my destination and unpack. And I...
  2. fastempo

    RPM too high at WOT

    I have a '73, 3.0- 140 motor in my Silverline Comoro 17T, which is running real well, but at WOT and trimmed out it is developing 5400 RPM, which is abt. 800 RPM more than the recommended max. Presently, I have a 15-1/2" diam., 19"pitch prop. , giving me a top speed of abt. 30 mph (gps). I have...
  3. fastempo

    replacing fan belt on 3.0- 140 engine

    Unless I'm missing something, there is no escaping separating engine from forward motor mount when installing a new fan belt on '73 3.0- 140 mercruiser engine. This will of course require the engine to be temp. supported some way, so fan belt can be slipped past this joint. Is it better suspend...
  4. fastempo

    Tri-Hull Club...Yes? No? Maybe?

    Re: Tri-Hull Club...Yes? No? Maybe? Here is my entry, '73 Silverline Comoto 17T w/ 3.0L 140HP GM I/O, Named "Blew-By-you", presently under-going a major restoration : transom, stringers, deck, interior, engine overhaul, kicker motor addition, wind shield, instruments, sound system etc...
  5. fastempo

    Which spark plug number?

    I have a GM 140 4-cyl, ser no. 3463059. The manual calls for AC-CR44N, so I looked up the NGK conversion and bought NGK-BR6ES, but they have too large a hex-head, as you can't fit a 13/16"-socket in the spark plug slot on the engine. The previous plugs that were in the engine were NGK-YR5, and...
  6. fastempo

    oil change

    I am new to this. Just bought 1973, 140hp mercruiser I/O. How do I change oil without spilling it all inside bilge, with crank-case drain plug so close to bottom of boat. there is no room to place drain bucket under?
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