'95 GT-40 Pump Burned Out, Smoke!

[rcsmith727]

My 1995 Super Sport had something burn up under the engine, smoke out and broke down. Last night we smelled burning plastic in the engine compartment, so we shut everything down and opened it up. Something was still running on the passenger side under the engine (sounded like a pump?). It put out some white-ish smoke until it burned out and now the engine won't turn over. Disconnected the battery to make sure the thing isn't getting power still. Wasn't the bilge.

Are both water pumps mechanical? It definitely sounded/smelled like an electrical pump - I'm guessing oil pump or fuel pump? Anybody else had this issue?

I'm a new boat owner, and this forum has been extremely helpful so far. Boat shops are all 3-10 weeks out in Denver, so I'll probably end up pulling it myself.

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[chefred112]

did you ever figure this out? pull the impeller and check it's condition... when that goes you usually smell burning rubber...

[chefred112]

yea, pumps are mechanical....when I bought my boat last year it was having an overheating problem;..tried swapping out impeller and housing and still overheated...then found out that you can mistakenly put housing back 180 degrees.... now runs nice and cool and I have a spare impeller and housing too

[rcsmith727]

did you ever figure this out? pull the impeller and check it's condition... when that goes you usually smell burning rubber...

That's a good idea, I'll start with the impeller. But this would not cause white smoke, correct? I'm pretty sure there was an electrical problem as well. I'm running 50w oil for the high zinc, so I'm worried the oil pump may have been working too hard and that burned up?? 360 hours and 22 years old, so I might have some bad hoses or something down there too.

That's a great looking boat! I love the blue (but I wound up w/ red). Do you have a Krypt Tower Bimini? I think I have the same one and a similar tower.

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[Fgroce]

Hi did the boat over heat? Did it get so hot that the plastic covers melted? Did the starter stay engaged? Did this happen right after you cranked it up. It may have been your starter staying engaged. Check the CB at the rear of the engine to see if it tripped. Check with a volt meter make sure that you have 12 volts on both sides of the CB. Check at the starter with the volt meter for 12 volts, then check again when you turn the key to try to crank it up. Look for a wiring diagram to help you out. Hope this helps.

[rcsmith727]

Hi did the boat over heat? Did it get so hot that the plastic covers melted? Did the starter stay engaged? Did this happen right after you cranked it up. It may have been your starter staying engaged. Check the CB at the rear of the engine to see if it tripped. Check with a volt meter make sure that you have 12 volts on both sides of the CB. Check at the starter with the volt meter for 12 volts, then check again when you turn the key to try to crank it up. Look for a wiring diagram to help you out. Hope this helps.

This happened about 2 hours in to the lake, and I had started/stopped the enigne several times. However, the engine doesn't turn over or anything when I turn the key now, so this is very possible. I'll check the starter and see if that was the problem - I've found a wiring diagram on here so I'll follow that. Hoping that was the cause vs a water/oil/fuel pump. Thanks for the ideas!

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[rcsmith727]

Hi did the boat over heat? Did it get so hot that the plastic covers melted? Did the starter stay engaged? Did this happen right after you cranked it up. It may have been your starter staying engaged. Check the CB at the rear of the engine to see if it tripped. Check with a volt meter make sure that you have 12 volts on both sides of the CB. Check at the starter with the volt meter for 12 volts, then check again when you turn the key to try to crank it up. Look for a wiring diagram to help you out. Hope this helps.

The starter was engaged, like you said! It burned up the covers. Just pulled it and off to find a new starter and solenoid.

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[vacooley]

Get a marine starter. Not all auto starters are spark resistant. Before you hook up a new starter find out why it ran away. Possibly bad starter switch or wiring short.


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[Fgroce]

Glad you found the problem. Hope you get back on the lake soon.

[rcsmith727]

You're right vacooley, the starter wires were grounding on the engine. The wires started smoking after I started it up with the starter.

There's a clip that holds them close to the engine just above the starter where they had rubbed the coating off the wires. I taped them up for the weekend but plan to replace soon.

I'd recommend anyone with an older boat to check these wires in the same place. I removed the clip since that was causing the wires to short.

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[rcsmith727]

Back on the water today! Thanks for your help guys

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[ScooterMcgavin]

Nice! Lookin good doing it too!

[vacooley]

All large gauge wiring connections should be checked when de-winterizing.


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[chefred112]

glad it was something that didn't involve internal mechanicals...my engine seems to run a little on the warm side (to my liking) when I'm driving faster then typical cruising speed, temp gauge shows between 160-180 when idling forward up til 25-30 mph...but when I get into to it and drive around 40mph+ the needle starts inching up close to 200 to which I back down to cruising speed to feel comfortable with the temp...