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  1. 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...
  2. 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...
  3. 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...
  4. 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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