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  1. M

    Prop Assy Spacing

    1974 Mercruiser 140 s/n 388xxx Late Model I Sterndrive s/n 390xxx Cleaned up my prop assy again. My son's old enough to work the helm now, so for the first time I got to watch the prop while he shifted (drive on earmuffs). When in neutral, lots of cooling water runs through the prop hub...
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    Swappable Engines & Drives

    Is anyone else interested in a thread for the Adults Only section that would list what engines can be swapped and what sterndrives (or drive shaft housings and gear housings) can be swapped? It seems to be a fairly common question. For example, I'm not currently looking to replace anything...
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    Latest Thoughts on Globe Blue Impellers?

    What are your latest thoughts on these? Why did the price of the Model # 1000 double?
  4. M

    Firing Order - 90 deg from manual?

    1974 Mercruiser 140 engine s/n 388xxxx Mercruiser "Late Model I" Stern Drive s/n 390xxxx I'm curious about this... The manual for my engine is Mercruiser Service Manual Number 2. Under "models covered in this manual" it includes "Mercruiser Stern Drive Engines", "MCM 140 s/n 3771645 -...
  5. M

    Spring Tab on Flywheel Housing Cover Plate?

    1974 Mercruiser 140 Late Model I sterndrive (120/140 s/n 390xxxx) What is this spring tab thing on my flywheel housing cover plate p/n 358641? It protrudes aft toward the inner portion of the flywheel, right next to the rear mounting disk portion of the crankshaft. The edge of the spring tab...
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    Model I Sterndrive Basic Questions

    I believe my 1974 Mercruiser sterndrive, serial number 390xxxx, is a "Late Model I". I have a few probably dumb questions: 1. Can the top cover be removed without messing up the preload on the vertical drive shaft? 2. In the parts diagrams, I don't see a gasket for the top cover; is there...
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    U-Joint Coupling Yoke--Toast?

    GM Engine 140 HP 4-cyl 181 cu.in. Mercruiser "Late Model I" Stern Drive This is my U-Joint Yoke - Coupler End 39385A 1, do you agree that the splines are toast? or click here and then click on the picture for a close up. How hard is it to change out the yoke? I've read the manual, and I...
  8. M

    THUMP THUMP... Spun Coupler? Sterndrive Shot?

    1974 Mercruiser 140 I/O GM Engine 140 HP 4-cyl 181 cu.in. not sure if this is related to the problem i had with the starter not disengaging... thread here. Got the starter disengaged, backed out gently, then into forward and a little throttle... thump thump... very little forward power, no...
  9. M

    Mercruiser 140 keeps running, starter engaged?

    On vacation with the kids, this just happened about an hour ago, sure hope you guys can shed some light on it. 1974 Mercruiser 140 I/O GM Engine 140 HP 4-cyl 181 cu.in. As discussed in my prior thread on a new starter, I got this starter: Mercruiser 3.0 Marine Starter Long-Short Mount 6563...
  10. M

    Oil Pressure - Mercruiser 140 hp

    1974 GM Engine 140 HP 4-cyl 181 cu.in. Mercruiser "Late Model I" Stern Drive Engine starts easily. Oil pressure takes a while to come up--it takes maybe 10 seconds to climb up out of the red arc. At idle it is down near the red arc, maybe 22 psi. As the rpm increases the oil pressure...
  11. M

    Starter for Mercruiser 140

    1974 GM Engine 140 HP 4-cyl 181 cu.in. Mercruiser "Late Model I" Stern Drive I have very quickly gone through two Arco 30460 starters, the 1st bought in June 2007 and the 2nd in June 2008. I've had some issues with water in my bilge. I've replaced the rubber boots but I still had some problems...
  12. M

    Engine Coupler Problem?

    Hello - I have a 1970's Mercruiser 140 hp with a Mercruiser I (or maybe I-R) outdrive. After starting for the frist time since winterization last fall, the drive wouldn't shift into forward or reverse, there was a thumping noise from the rear of the engine, and the engine temp started climbing...
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