cterrebone(or Ferm), I have a vro question for you. I'm working on a late model 70(Johnrude) carb 3 cylinder, the fuel pump died, the oil side was disconected long ago, any cheaper fixes for this. I've used teh old standard pre oil injection pumps with a home made bracket, just figured you have run into this before, I know bomb has a fuel only round pump, but I believe its pretty expensive.
AS far as oil injections go, they all have their faults. I rebuilt the pump on my V4 looper with all factory parts and it lasted for about 10 minutes before the alarm went off(it go changed to an old style pump, still running today as far as I know). With Mercurys, the weak point is the crank gear as its made out of plastic, every one blames the gear for mysteriously coming apart. Mercury has eliminated the shaft sensor and coupler on the later model carb and EFI engines as they found out teh coupler was swelling and sticking up the shaft, casuing the gear to fail. I have also noticed that I run into gear failures on boats that have recently been run hot, Its not like you can easily pop the power head apart to inspect the gear just to be safe($$$$), you go that far on a merc, you might as well rebuild the thing whi;le you have it down. had one melt a gear on a mercury reman power head that had 4 hours on it, can't believe it stayed together(double oil for break in saved his but), it got so hot it melted wires to the head. I removed the oil system, kept premix in the tank and sent him on his way, the boat continued to run till he sold it two years later( don't know after that). And as far as Yamahas go, they do have a pretty good system, but neglect it and the inline filter will clog, the hoses will become brittle, and the pump can fail, just like any other piece of machinery that isn't treated well. If Mercury had have used a bronze gear, they wouldn't have half the issues they are know for
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06-09-2009, 08:25 PM
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