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#1
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Here's my stupid question of the day...can't you replace the plastic gear with a metal one? You could probably find a match in a McMaster-Carr or Grainger catalog and find a local guy to cut a hole and keyway. No worries of breaking then.
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-Steve "Oar Chasm!" 1977 Wellcraft V20 Step OB cuddy. 1971 1350 Merc "Any damn fool can navigate the world sober. It takes a really good sailor to do it drunk." - Sir Francis Chichester 
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#2
08-27-2014, 12:00 AM
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Quote:
__________________
1987 V20 w/1987 150HP Yamaha on a Shoreland'r Trailer 1978 16.5 Airslot w/1996 120HP Force on a Four Winns trailer 1996 V21 w/1993 200HP Mercury on a Shoreline Trailer All towed by a 5.7L Hemi Durango. If God didn't have a purpose for us we wouldn't be here, so Live simply, Love generously, Care deeply, Speak kindly. (Leave the rest to God)  Silence, in the face of evil, is itself evil. Not to speak is to speak, not to act is to act. God will not hold us guiltless.
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#3
08-28-2014, 08:51 PM
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OK, after doing some research here's what I found. The one gear is made of metal and is held in place by nylon bushings. Over time, the bushings swell and put pressure on the other gear which is made of plastic. The pressure and the engine heat cause the plastic gear to soften and strip teeth which results in no oil and ruins the engine. By the time the zero rotation sensor goes off and sounds the alarm it's too late.
In 2000 they switched to brass bushings to fix the problem, but they didn't change the plastic gear. That gear, after sitting for long periods of non-use, (like over the winter) tended to get brittle and then it would strip teeth once put back into service. So the problem persisted. One of Mercury's engineers left the company and started his own company making electronic oil pumps to correct the problem. The pumps have proven to be reliable and have a MTBF rate of 600-800 hours.
__________________
1987 V20 w/1987 150HP Yamaha on a Shoreland'r Trailer 1978 16.5 Airslot w/1996 120HP Force on a Four Winns trailer 1996 V21 w/1993 200HP Mercury on a Shoreline Trailer All towed by a 5.7L Hemi Durango. If God didn't have a purpose for us we wouldn't be here, so Live simply, Love generously, Care deeply, Speak kindly. (Leave the rest to God) Silence, in the face of evil, is itself evil. Not to speak is to speak, not to act is to act. God will not hold us guiltless. Last edited by Destroyer; 09-28-2014 at 02:13 AM.
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