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  1. 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
  2. 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...
  3. 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...
  4. Scott06

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

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

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

    Yes only gaskets u need marine are head gaskets
  6. 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
  7. Scott06

    Exhaust Manifold bolts

    Barr is very good I bought manifolds and elbows they came with bolts. Their gaskets are good too
  8. 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 .
  9. 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...
  10. Scott06

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

    Yes early 70 s was 140 hp Rating . My 1991 boat(1990 engine build date)lx was 135 hp not sure if the diff was prop vs flywheel that the 140 was. There was no 2.5 in 1990 ( per Don S last year was 89) the 115 or 120 hp 3.0 ( non lx ) i belive had the 3.0 block with the smaller port older design...
  11. Scott06

    Mercruiser B4S Conversion

    I would love to try it just cant afford the buy in. Neighbors at the lake have a 24 ft mastercraft, beautiful boat but outta my league $ wise ive had fun with my kids and their friends wake boarding, which for a 50 yr old guy is painful. Added a tower, which helps to pull up large mamals, but...
  12. Scott06

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

    Agreed my sea ray was a 170 i think (1991) i ran both a 3 blade 17” black max and the 4 blade 16” voretx, cannot imagine going lower in pitch as either of those loaded would hit 4800 easily . there were a couple different 3.0 s offered i think one at 115 hp and the lx at 135 Hp…
  13. Scott06

    Mercruiser 4.3 removing oil from bores?

    That is too fancy I just twisted them together. Either way throw the leads in your tool box on the boat if you ever have an issue out on the water with key or dash you can hot wire it...
  14. Scott06

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

    I had the exact same boat for 20 years. Year 21" is too much pitch for your engine I used a 18" 4 blade michigan wheel votex for tubing/cruising I used a 16" 4 blade michigan wheel vortex for skiing Both worked very well and were relatively inexpensive being aluminum Also make sure you...
  15. Scott06

    Connecting a electric fuel pump to 5.7LX

    No I'm thinking of the mercruiser wiring diagram a posted and how it powers an electric fuel pump …
  16. Scott06

    Mercruiser 4.3 removing oil from bores?

    5/6/7 are the wires . 6 red purple is 12 v + to dash 5 purple is ignition 7 yellow /red is to engage starter solenoid and thus starter i took two pieces of 14 gauge stranded wire , twisted two ends together and put them in 6. Stick one of the other ends in 5 for maintained power to ignition...
  17. Scott06

    Connecting a electric fuel pump to 5.7LX

    No the purple wire doesnt have power until the key is released from start into run position. Old motor was a mechanical pump right? merc did essentially have a second switch, the key triggering the starter…which powers the pump during cranking.
  18. Scott06

    Mercruiser B4S Conversion

    has the forward facing dual props so you can safely wake surf behind it . Like the VP forward drive it is a way for stern drives to get into the wake boat market that until now has been the realm of really expensive V drive boats ...
  19. Scott06

    Carb choice.

    I knew you would say that. bottom line when properly rebuilt, set up and maintained qjets, AFB/webber/Edelebrocks, and Holleys all work very well. Key is getting decent core carbs and having the knowledge and experience to make it work. When you hear comments otherwise one of these is lacking...
  20. Scott06

    Missing drive oil bottle ???

    I don't think they take the project boats... only the shinny ones.
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