Yanmar dripping oil ...

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eliems

.
Apr 26, 2011
102
Hunter H28 Port Moody
Yanmar 2GF 18 horse 1993 (2000 hours on it).

Noticed two places on the absorbant where some oil has dripped, under the front face (seemingly from a small round faceplate behind the belt about the center of the engine above and to the right of the water-pump ... what is that faceplate?) and also under the rear of the engine and I can't see a source.

Is it likely the oil could come down the front and find it's way to the rear before falling on the absorbant or do I have two leaks? There is a few tablespoons on oil on the absorbant in total.

What are the probable causes?

Should I be attending to this before motoring off for the weekend or can I deal with it later? The oil level in the motor is safe.

Also an Alarm went off for the first time showing over-heating. The operator was running at 3500 RPM (basically WOT) for a few minutes before I notice and dropped to 2800RPM. After a few seconds the Alarm came on and the red light for Over Heating so I idled the motor for a half minute and the alarm stopped the light went out and we carried on.

Question: Did the overheating come from dropping rpm on a hot engine, is it normal to overheat if running WOT (wide open throttle) or do I have a cooling problem?

Question: Could overheating cause the oil drip issue perhaps from an overflow or breather outlet?

Thanks, Greg
 

Alan

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Jun 2, 2004
4,174
Hunter 35.5 LI, NY
My 3GM30F has done the same thing since brand new. If I run for more than 5 or 10 minutes wide open the alarm sounds. If I keep her at 3K or lower there is no alarm. Problem stems from insufficient water flow through the exchanger. Its cause by a small (1/2") thru hull water intake. Some day I plan to increase the size but its no big deal. I can run 7.2 knots at 3,000rpm all day.
 
Oct 29, 2005
2,362
Hunter Marine 326 303 Singapore
eliem, the oil leak at front of engine sounds like coming from the starting shaft (hand crank) you probably haven't fitted this option so it's just a shaft with a cover on it. The oil seal in mine was leaking oil. It's a quick and easy fix (if that's source of your problem). Get a small screw driver, pry out the oil seal, bring it to a car parts shop as sample to get a new one, clean hole where the seal sits in and pop the new seal in that's all. If that's not your problem, then good luck with troubleshooting. Cheers.
 

eliems

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Apr 26, 2011
102
Hunter H28 Port Moody
Yes it is ... so it is a hand crank window? OK, one oil seal coming up.
 
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