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  1. Scott06

    Is my coupler off ? looks like it and drive won't go back in ..

    You need an alignment tool to determine if the alignment is off Cant tell from photos. put grease on the tool, put it into the coupler , the coupler will leave witness marks or marks in the grease to allow you to tell if it is centered. If you google mercruiser alignment tool you can find them...
  2. Scott06

    Conversion

    I'm assuming you have a newer replacement block that doesn't have a provision for a mechanical fuel pump? you need to wire it up through a oil pressure switch. If you follow the merc wiring diagram you can see how to properly wire it up. The merc pumps are made by airtex which is available at...
  3. Scott06

    Mercruiser 4.3 Vortec Backfire and no start

    Yes you have a TB V shown in your photos attached to exhaust elbow
  4. Scott06

    Merc 4.3 Vortec Conversion

    https://www.summitracing.com/parts/edl-1478 would think this kit would work.
  5. Scott06

    Mercruiser 4.3 Vortec Backfire and no start

    Yes you need to put it in base mode to set the timing. As others have said the compression is good enough that the engine should run. It does seem to cough and with no backfire clearly timing should be closer. Agree with NOLA timing or firing order must still be off… can you post a video of...
  6. Scott06

    Mercruiser 3.7 / 470 Holley EFI Sniper.

    Perfect. On the harden one they have a couple small holes on either side of oxygen sensor for cooling, and they claim their anodizing resists the corrosion sometimes seen with aluminum on the raw water side, but may e you can find a way to keep this on the closed side of the cooling
  7. Scott06

    Mercruiser 3.7 / 470 Holley EFI Sniper.

    If you need to stab an o2 sensor in you will need something like this https://www.michiganmotorz.com/o2-spacer-stock-mercury-riser-wet-joint i just bought one to sanity check the jetting on my boat With my air fuel ratio meter. One thing the AFR meter companies mention is for marine...
  8. Scott06

    Thinking of buying a Maxum 2400 SCR. Thoughts?

    I think you will a bigger engine than a 5.0 with 220 hp in a 24 ft
  9. Scott06

    Mercruiser 4.3 Vortec Backfire and no start

    Number on cylinder on tdc of compression stroke & rotor pointed at number one cylinder is all you need to worry about, get it running then set timing with light, idle speed and mixture.
  10. Scott06

    Mercruiser 4.3 Vortec Backfire and no start

    Not flywheel on the balancer don’t worry about where dist is now you will be pulling it out to retime anyways You are 180 degrees out being on exhaust stroke so #1 will have to move
  11. Scott06

    Mercruiser 4.3 Vortec Backfire and no start

    Yes needs to be on compression stroke . If you cant see your rockers to verify both valves are closed put your thumb over the spark plug hole. It will only build pressure coming up on compression stroke not exhaust. if you time it on tdc of the exhaust stroke it will back fire as ignition will...
  12. Scott06

    Mercruiser 4.3 Vortec Backfire and no start

    What he said … leave the hold down loose if it doesn’t fire twist distributor while cranking to find a spot where it will run enough to set timing
  13. Scott06

    3.0 mercrusier runs badly after it warms

    If you take the coil wire off and dont ground it the energy for the spark needs to go somewhere so it will arc off the coil to where ever it can find a ground. All this say to me is you have a good spark coming off coil As bondo said did you strip and clean the carb internally ? Have you tried...
  14. Scott06

    Sea Ray 21SPX Electrical Issue

    My Sea Ray has a stereo fuse in the harness back by the battery. Did it get shorted when you replaced the battery. Some boats have several hot leads for accessories - did they all get hooked up? Blower motor could have died, strange coincidence but electrical components work until they dont...
  15. Scott06

    Twin Mercruiser L6's '74 165's now 292

    Like a broken clock we may be right twice a day ...
  16. Scott06

    Twin Mercruiser L6's '74 165's now 292

    Yes only gaskets u need marine are head gaskets
  17. Scott06

    1990 Sea Ray 160, Mercruiser 3.0 with Alpha one gen 1

    Might be worth verifying your tach is ok before ordering props. Would likely anticipate gain of 200 rpm for each inch of pitch you drop So 4” drop to a 17” three blade would likely get you to 4700 rpm at wot
  18. Scott06

    Exhaust Manifold bolts

    Barr is very good I bought manifolds and elbows they came with bolts. Their gaskets are good too
  19. Scott06

    Temp sending unit

    As long as the penetration depth gets to where it is hot and the ohm rating on them is the same ( matches ohm range of guage) then yes. at room temp check ohms between terminal thread and body on both at room temp and both heated in boiling water. Ohms should change with temp .
  20. Scott06

    Can run a 4.3 Merc without the alternator belt?

    Wouldn’t do it either they are are normal flare fittings merc sells a fitting that is a coupling goes from supply to return side flare fittings (they are different sizes) off the steering cylinder. This is how they ship their bobtail engines. all you need to do is take a female flare fitting off...
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