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  1. N

    3.0 Mercruiser Dies On Acceleration

    Timing was at 1 degree ATDC when it should be at 1 degree BTDC. Not sure how it moved on its own. Correct timing, and clean spark plugs gets me to 15 inches of vacuum. I will still replace the gaskets on the manifold but it should run fine now
  2. N

    3.0 Mercruiser Dies On Acceleration

    Checked compression and they all held 175 psi for over 5 minutes and while I waited i cleaned the #4 spark plug because it had alot of dry carbon fouling. Started the boat and got 10 inches of vacuum now. But this is in the drive way so the increase in vacuum is probably due to no exhaust...
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    3.0 Mercruiser Dies On Acceleration

    I believe it was 165psi each right after rebuild, hope it didn't fall off
  4. N

    3.0 Mercruiser Dies On Acceleration

    I rebuilt the engine last April and it ran well all summer. Ill check the compression and try the oil trick around the sealing surfaces of the manifold tomorrow morning. I really doubt it the timing because I haven't messed with it in a while but it does act like it's stuck in base timing mode...
  5. N

    3.0 Mercruiser Dies On Acceleration

    1992 3.0 Mercruiser will start fine. Idle is at 750 rpm at idle at 2 turns in on the idle screw. And at 1 1/4 turn out on the mix screw the vacuum is only 5inches. I should be idling forward to check rpm and vacuum but I cant stay in forward without the boat dying. In this condition, the...
  6. N

    No Start, but should

    It's for sure getting fuel. The accelerator pump sprays fine too when I prime it. Then the engine does sound like its firing just not staying running
  7. N

    No Start, but should

    Update: tried 360 degree rotation of the distributor at TDC, result: backfires through carb. Verified tdc at #1 clyinder with a compression gauge and set distributor at #1 spark plug, result is firing but not starting. While cranking with killswitch engaged does not fire, fires when kill switch...
  8. N

    No Start, but should

    I dont have a reason to believe that is the issue but I will try that tomorrow. About to give up and wait the 3 weeks for the shop to look at it
  9. N

    No Start, but should

    Rechecked the distributor pointing at #1 at tdc and it does. I say a video on YouTube where the guy didn't do the special timing procedure he just set it to 8 degrees BTDC and it fired right up. Guess I'll give it a shot. BTDC can't hurt much.
  10. N

    No Start, but should

    I followed the timing procedure in the manual and used a timing light the adjust the timing while cranking it. The distributor was initially lined up with the marks from the factory and adjusted the timing starting from there. The spark plug wires go to the correct spark plugs i checked
  11. N

    No Start, but should

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  12. N

    No Start, but should

    3.0 Mercruiser fresh rebuild. Compression around 200 psi in all clyinders, spark at every spark plug, timing set to 1 degree BTDC like the cover says, carb is new and properly squirting fuel, battery full and new starter. When I crank it the engine cranks strong and then after 2 seconds it sound...
  13. N

    Oil coming from exhaust riser rubber coupling

    They all were all black and #4 was wet not sure if its oil or gas, most likely oil
  14. N

    Oil coming from exhaust riser rubber coupling

    yes its a 1992 VIP. Compression is 165,165, 165, 170. I was hoping that at the worst I'd have to rebuild the top end
  15. N

    Oil coming from exhaust riser rubber coupling

    The serial number looks like OD8104 but its very worn. 3.0L Mercruiser the engine would go over 1400 rpm before the new carburetor. The oil level is a bit high with no milky appearance just alittle dark. Im not sure if its a new problem the previous owner won't respond after he sold me this heap.
  16. N

    Oil coming from exhaust riser rubber coupling

    I was testing a new carburetor on the lake. Couldn't go over 2500 rpm WOT and definitely wouldn't plane. After 10 minutes the engine bay was full of blue smoke and oil was spraying out of the exhaust riser rubber coupling. Where do I start? Extra details: engine timed, new spark plugs and fuel...
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