40 Mercury Smoking

[CajunChristian]

Originally Posted by Marshgoat

Thanks for the advice guys. In your opinion what is the biggest danger, the pump itself failing or an oil line breaking? I've researched a little and it appears some people have had Mercury oil pumps fail due to a plastic gear or bushing in the pump coming apart. Not sure if a 99 model would have plastic or not???. I guess you can tell I would prefer to keep the injection system but I also don't want to ruin a powerhead. Boat has a permanent fuel tank built as a step up to the front deck, I switch back and forth to a surface drive a couple times in a year so premixing fuel will be a little pain in the @#% every time I switch back to the Prodrive.

I have never seen a 40/50/60 Merc oil pump fail. It's usually a pinhole in one of the oil lines that gets you. The larger Mercs have a nylon drive gear on their pumps, the 40/50/60 has a metal drive gear.
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[Marshgoat]

At the very least, I am changing all the lines ASAP. Thanks for all the advice and reply's. Much appreciated.

[CajunChristian]

Originally Posted by Marshgoat

At the very least, I am changing all the lines ASAP. Thanks for all the advice and reply's. Much appreciated.

Make sure you bleed ALL of the air out of the new lines. If you vaporlock the pump, kaboom, grenade powerhead.
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[meaux fishing]

Originally Posted by CajunChristian

I have never seen a 40/50/60 Merc oil pump fail. It's usually a pinhole in one of the oil lines that gets you. The larger Mercs have a nylon drive gear on their pumps, the 40/50/60 has a metal drive gear.
D

yeah mine was the 125