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  1. Scott06

    Exhaust Bellow

    Yes the exhaust bellow is just below the u joint bellows. Absolutely no issue if it it’s torn or not there. It is open to the water at the propeller. Might be a little louder exhaust note that’s all.
  2. Scott06

    Pistons on Ford 302 / Mercruiser 188

    If you can get a scope camera put it in the spark plug holes You may find an over bore size and piston part number in the piston face. recently I was looking at buying a Pontiac V8 for my GTO, it was previously rebuilt, had seller take pics of the piston tops, and it revealed a part number for a...
  3. Scott06

    Pistons on Ford 302 / Mercruiser 188

    I would think this was a recent rebuild prior to being put away given how carbon less it looks especially on the pistons. Not sure if ford painted them blue then delivered them to merc or if you have a 302 from any vintage in the last 50 years...
  4. Scott06

    Motor knocking. Mercruiser 3.0 alpha 1

    Good point about the fuel pump. That is probably the most likely.
  5. Scott06

    Mercruiser Vacuum Gauge

    Depth might be useful. You can live without the trim and speedo....
  6. Scott06

    Motor knocking. Mercruiser 3.0 alpha 1

    They are not the quietest engine around. I think it is coming from the front but would also pull the drive to rule out drive gimbal etc. Also run it without the belt on to see if the water pump is bad. Im thinking the noise may be valvetrain or timing gear related. Might look to see if there...
  7. Scott06

    Need ideas on problem with 5.7L Mercruiser shutting down

    If it didn't turn over I would suspect you dropped 12v to that engine would start with cleaning and tighten both positive and negative battery connections. IF it happens again try and jump the starter solenoid to confirm if issue is wiring up to helm or is in engine harness. Would also remove...
  8. Scott06

    1986 Mercruiser 470/170hp/3.7L Carb backfire, low vacuum, other weird issues

    I would look at the rubbing block on dist to see if there is uneven wear. would try another set of points and condenser to see if that is why the dwell is so inconsistent. Have never seen a dwell bounce that much.
  9. Scott06

    4.3 GL-C - Distributor clamp bolt

    Those tamper proof Allen head wrenches or tools are available at most home stores and Amazon if u know the size
  10. Scott06

    OMC vs Volvo drives

    Modern Volvo sx drives are robust and durable. Most of what you are metioning was a hangover of issues OMC had with the introduction of the cobra outdrive. Although the drives look similar to the omc cobra Volvo heavily modified them post acquisition. Have several neighbors at the lake with VP...
  11. Scott06

    Bravo 3 loss of lube oil - slowly then rapidly x2

    You need to pull the boat before you get water in drive. When u say lower unit was replaced you you mean the lower half or the complete outdrive
  12. Scott06

    Propeller Pitch Selection

    Agreed he has to have more gear reduction. Have you tried a Rev 4 vs the enertia? The "effort to turn down low" is almost too much for my 5.0/1.81 drive. The grip on these props (incl enertia is insane)
  13. Scott06

    Fuel Pump Wiring

    Purple wire to pressure switch off the switch have a splice/T one leg to starter other leg to fuel pump. This way the fuel pump gets powered either by starter when starting or thru the Switch when ignition is on (12 v to Purple wire
  14. Scott06

    MerCruiser 4.3lx shortblock compatibility?

    I dont think the heads in as left GM condition can take anywhere close to .500” lift i think vortec may be limited to .430” with machine work
  15. Scott06

    Engine fogging

    No issue With carb at all.
  16. Scott06

    MerCruiser 4.3lx shortblock compatibility?

    Missed that. Then yes rebuild the junk yard 4.3 vortec... unless it has good compression. if so might get away with just changing head gaskets and core plugs
  17. Scott06

    MerCruiser 4.3lx shortblock compatibility?

    You can re jet your weber carb for the vortec heads. The weber carb is essentially the same as the edlebrock 1409. There are a few threads here where guys lay out the jetting needed to work on a vortec 4.3 If there is nothing wrong with your current short block take the donors heads to a shop...
  18. Scott06

    1986 Mercruiser 470/170hp/3.7L Carb backfire, low vacuum, other weird issues

    Ok if cooling system holds pressure head gasket is ok, look elsewhere for low compression rings or valves. Rule out dwell and timing.
  19. Scott06

    1986 Mercruiser 470/170hp/3.7L Carb backfire, low vacuum, other weird issues

    You said the AF side of the cooling system did not hold pressure, correct? if so there is a leak somewhere could be heat exch. Would do a poor mans leakdown test or rent a leakdown tester to see if valves are leaking by and verify dwell timing and Scott recommended. Hard to say from the...
  20. Scott06

    1986 Mercruiser 470/170hp/3.7L Carb backfire, low vacuum, other weird issues

    Find out if you have a valve leaking past seat that would be my inclination with low compression and backfire
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