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  1. Eric 3.7LX Alpha 1

    Sterndrive

    Usually vibration like what you are describing is from worn u-joints. Too much grease on the splines can make putting the drive back on difficult also.. and don't use grease on the two O rings on the shaft that seal inside the gimbal bearing, light oil on them instead or they will hold you up...
  2. Eric 3.7LX Alpha 1

    Quicksilver ?

    How does it feel if you stick your fingers inside it and turn it by hand? does it feel rough at all or silky smooth?
  3. Eric 3.7LX Alpha 1

    Shifting very difficult

    Here is picture of the splined shaft on the lower half of the drive. The intermediate shift shaft is on the upper half of the drive, and is splined inside to drop over the splines on the lower half of the drive.
  4. Eric 3.7LX Alpha 1

    Help understanding vacuum test

    Adjust the timing light knob so the timing mark on the balancer is at zero, then read where the knob is pointing at which will be your timing.
  5. Eric 3.7LX Alpha 1

    Mercruiser 5.7 ?

    There's a search feature. It looks like a magnifying glass. You can type your question there and see if has been asked before. Looks like between 235 and 265 HP depending on the model engine. There are 6...
  6. Eric 3.7LX Alpha 1

    early 70's Mercruiser 165hp inline 6 w/ MC-1 drive not going into gear (sometimes)

    Here is a link from the Adults Only sticky at the beginning of the forum that may help: HOW TO: How the Shift Interrupt system works and this one also: Mercruiser Alpha Shift cable adjustment
  7. Eric 3.7LX Alpha 1

    early 70's Mercruiser 165hp inline 6 w/ MC-1 drive not going into gear (sometimes)

    That's your shifter you have at the helm.
  8. Eric 3.7LX Alpha 1

    89 centry palimino with a 3.7 mercruser charging issue.

    I did the replacement voltage regulator once. When mine went it was overcharging, both times. The 2nd time I switched to a Delco 10si belt driven alternator. There was a guy on here last year that converted the vr to one for a Harley. Here's the link to the old thread...
  9. Eric 3.7LX Alpha 1

    Drive stuck in forward position

    When the two halves of the drive are split and being put back together, they must both be in forward the whole time, to do that, you have to keep pressure on the prop CCW while rotating the splined shift shaft CW on the lower half until it locks in gear. Pressure on the prop CCW the whole time...
  10. Eric 3.7LX Alpha 1

    Fuel pressure

    Engine running, for a carb, that's a little too high. I'd be trying for 4-5 psi.
  11. Eric 3.7LX Alpha 1

    4.3 L exhaust 90 degree drain cracked in manifold

    You might be able to use a rubber expansion type plug to pressure test the engine. They make different sizes... I wouldn't know what size you'd need. Something like these: Rubber expansion wing nut plug
  12. Eric 3.7LX Alpha 1

    4.3 merc . spring starup

    quick guess.. possible valve stuck open on 4.
  13. Eric 3.7LX Alpha 1

    Engine wont shut off with key

    You can put a diode inline on the excite wire to the alt and stop the back feed. The diode only allows current to travel one way, into the alternator. Painless performance sells a kit # 30720, comes with a couple of heat shrinks, butt splice and a diode to stop that back feed...
  14. Eric 3.7LX Alpha 1

    Mercruiser 170 Rough Idle on Start and High Oil Pressure

    I agree with Mike. Here is a diagram of the coolant flow for the engine, which shows where the coolant bottle connects to. I also have a TSB attached showing timing was lowered down to 4 degrees.
  15. Eric 3.7LX Alpha 1

    Analog to Digital

    So guys, with this NMEA 2000 signal converter, you keep the existing sensors in the engine? Oil pressure, water temp... etc.. very slick indeed. I just picked up a Raymarine Axiom 9 to replace my 25 year old grey scale Garmin plotter & fishfinder, I'm going to go this route also. Does the...
  16. Eric 3.7LX Alpha 1

    Dual battery shut off wiring

    What Achris mentioned is called an automatic charging relay. I have a couple made by Blue Sea Systems # 7611. Blue Sea charging relay I also have one in my work truck under the hood. We have added a 2nd battery and inverter by the back of the truck. With it, with the truck off, the two...
  17. Eric 3.7LX Alpha 1

    Starter issue, possibly water related

    Was the starter under water?
  18. Eric 3.7LX Alpha 1

    Recommend a dwell meter

    I was given a Craftsman engine analyzer with the box and all cables to do multiple tests, including dwell. Just like this one here: Vintage Sears Engine Anazyzer
  19. Eric 3.7LX Alpha 1

    5.0 mpi backfiring through exhaust. Won’t start

    Are the spark plug wires on correctly? Are you sure your #1 plug is connected to the the #1 cylinder on the cap? You should verify the location of #1 on the cap. The previous owner may have pulled all the wires off at once and didn't get it correct. Pull the spark plugs out, leaving the wires...
  20. Eric 3.7LX Alpha 1

    Mysterious part in bilge - what is it??

    Yup, part of a rotor from under the distributor cap.
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