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  1. 04fxdwgi25

    Tie down caliper mounting bracket

    HeliCoils. Usually stronger than the original threads. $10 in parts and a 1/2 hour of your time.
  2. 04fxdwgi25

    5.7 coil issues

    I would get a good service manual, probably the Mercruiser ones for the engine and Alpha drive unit. Short check. On stbd side exhaust riser is a "shift plate" where the shift cable(s) merge. One is from the console shifter and the other goes down to the drive. There is also a micro switch with...
  3. 04fxdwgi25

    Mercruiser exhaust question

    No. With drive tilted up, it is easily reached at the top of leading edge of the lower unit. A yellow connector.
  4. 04fxdwgi25

    Mercruiser exhaust question

    Common overlooked item is plugging the pitot tube back into the lower drive on assembly
  5. 04fxdwgi25

    Outdrive gear ratio.

    My last boat was a Chapparal 2550 SX Sport w/ 7.4 and B1 drive and same weight as yours at around 5080 lbs dry and an 82 gal gas tank.. That was a 1.5:1 ratio and would run 53 mph all day long. I'll see if I can find the old prop size spec it had.
  6. 04fxdwgi25

    Problem Replacing old incandescent NAV lights with LED lights

    According to the pic you provided, the bulbs are bi-pin, so rotating 180 will change polarity. I believe what you are chasing is a wiring / switch problem, especially since it is a boat over 60 years old. I would bet even money, the wiring has been "repaired" form time to time by a shade tree...
  7. 04fxdwgi25

    Problem Replacing old incandescent NAV lights with LED lights

    Just curious why the lights are in series? If you have a 12V battery, and they are in series, the bulbs need to be rated at 6VDC each if they are the same bulbs, (each bulb would drop 6VDC x 2 for a total of 12VDC) for them to be at rated lumens. All 12VDC systems bulbs are connected in...
  8. 04fxdwgi25

    5.7 coil issues

    Have you checked the ignition cut out switch on the shift linkage?
  9. 04fxdwgi25

    Does anyone know what the 2 pin sealed connectors Mercruiser uses on their wiring harnesses are?

    These? https://www.amazon.com/Connector-Connectors-Automotive-Accessory-Motorcycle/dp/B09S3N51GM
  10. 04fxdwgi25

    2002 5,7 Mercruiser exhaust manifold keeps cracking - 5 times this summer

    Have you put a diagnostic tool on it, like a Rinda, that can log / chart what is going on? There may be sensors gone flakey to tell the ECM to do odd things, since the problem didn't move when you swapped ECMs. That kinda rules out the ECM. All that's left is standard mechanical testing like...
  11. 04fxdwgi25

    2002 5,7 Mercruiser exhaust manifold keeps cracking - 5 times this summer

    6 bad manifolds, I would be raising Kain with the manufacturer.
  12. 04fxdwgi25

    Not getting water to crank pumps-Bravo1

    how well do the muffs seal to OD? If muffs are old and stiff the seal may not be good enough to prime.
  13. 04fxdwgi25

    Electric nightmare

    ^^^^^ And that right there is why the question won't be answered properly
  14. 04fxdwgi25

    What does HEI / D.U.I. replace

    Pretty sure that would be an Alpha drive. Check to make sure the ignition cutout switch and it's wiring on the shift cable plate are all good. Have seen a few of those switches go South or act all weird.
  15. 04fxdwgi25

    2002 5,7 Mercruiser exhaust manifold keeps cracking - 5 times this summer

    Personally, I would be leaning toward head / fuel delivery / head gasket, myself. Other 3 manifolds not doing it. This one has done it 3 times in close succession in the exact same spot. Just makes no sense. If water flow is good and correct risers are there and NOT leaking, then it needs to be...
  16. 04fxdwgi25

    What does HEI / D.U.I. replace

    Thunderbolt module is the ignition control model, controlling spark and timing, with TB5 having knock sensor
  17. 04fxdwgi25

    2002 5,7 Mercruiser exhaust manifold keeps cracking - 5 times this summer

    Are you 100% sure the manifolds are actually cracking?
  18. 04fxdwgi25

    MC Chevy V8 Bravo 1 Crankshaft water pickup pump issues

    If impeller was trashed, means it ran with out water. Those pumps are more reliable than the Alpha, pump more water and are much easier to change / maintain. Are there thru hulls for water pickups? Sometimes they get added when when a Bravo drive water passage corrodes and blocks up and the...
  19. 04fxdwgi25

    TZ Trim Tabs

    Sorry, but can't offer any thing to help. Have spent nearly 45 minutes searching and find absolutely nothing about TZ tabs anywhere on the net.
  20. 04fxdwgi25

    TZ Trim Tabs

    Wish I could help, have never seen that brand before, never mind heard of them. Can find zero info on them on the web. Are they on some exotic high speed boat? What make / year boat are they on. Bennett and Lenco are the common go to electric or hydraulic trim tab guys for us commoners. Those...
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