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Old May 6th, 2008, 04:44 PM
aaronriets aaronriets is offline
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Default smoking 40 hp Mercury, 402

I have recently become a boater. I bought an older crestliner with a Mercury 402 40 hp outboard. I got the gas line replaced and the motor seemed to fire up.
But it was smoking a bit. I just thought that it was burning off old oil/dirt. But it got worse. I noticed that it wasn't shooting water out the motor at all, so i guess the water pump needs attention. How do I access this part and fix it?
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Old May 6th, 2008, 05:04 PM
steelespike steelespike is offline
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Default Re: smoking 40 hp Mercury, 402

I'm not familiar with that motor but you should get yourself a service manual before starting any repair.You may find an after market manual at the library.
In the mean time be sure the intake and telltele(if any) are clear.
bugs like to nest in there.If your running in a barrel fill it to the brim and get it right up against the bounting bracket.
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Old May 6th, 2008, 06:16 PM
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Chinewalker Chinewalker is offline
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Default Re: smoking 40 hp Mercury, 402

It's a 2-stroke - oil mixes with the gas. It's SUPPOSED to smoke a bit. I hope the gas you hooked up to it was mixed at a 50:1 ratio with a TCW-3 rated oil.

Get yourself a manual. For the waterpump, one of the aftermarket manuals (available right here on iboats) should be sufficient.

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Old May 6th, 2008, 07:17 PM
FREDDYPD FREDDYPD is offline
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Default Re: smoking 40 hp Mercury, 402

Not sure if it applies to you but I am following this thread. I am going to decarb and change out my oil check valves:

http://forums.iboats.com/showthread....ighlight=smoke
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Old May 7th, 2008, 12:47 PM
aaronriets aaronriets is offline
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Default Re: smoking 40 hp Mercury, 402

It was smoking a ton! I would imagine that it's supposed to smoke a little, but there was extreme amounts.
I did mix the gas and 2 stoke oil 50:1, so that should be fine.
I noticed that there was no water squirting out the motor. Should there be? I would imagine that's how it's cooled?
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Old August 20th, 2008, 03:59 PM
marshall53 marshall53 is offline
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Smile Re: smoking 40 hp Mercury, 402

there should definitely be water coming out... could be plugged hose, but probably needs a water pump
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