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Thread: 1987 mercury 60 hp piston damage
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10-12-2020, 09:08 PM #1Junior Member
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1987 mercury 60 hp piston damage
Hello, I had a piston failure in my number 1 cylinder and I was wondering if anyone might be able to identify the root cause from seeing the piston. The engine did not seize but the metal pushed onto the plug shorted the spark killing the one cylinder. I recently had to replace the stator and timing trigger but the motor ran fine for a month before this occurred. From the picture can one tell if this was a progressive failure or does this type of failure happen quickly.
thanks for any help.
jumbo 3905
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10-12-2020, 11:53 PM #2Screaming And Flying!
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The old...... Mercs do that ,The piston has that high Dome that keeps the exhaust and intake seperated..It runs hot and acts like a heat sink. Low octain gas or lugging the motor will put the motor at risk. Merc cut the dones a 1/16 of an inch to help the problem and lower the timing advance. Your timing might be a bit advanced where you replaced parts. Pop a nudda piston in and sail on.Check/ retard the timing and don't lug the rpms.
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Merc 2.5 liked this post
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10-13-2020, 06:43 AM #3Junior Member
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10-13-2020, 08:27 AM #4Screaming And Flying!
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Use Shell 91 Vpower. Check all is correct with the timing and the carb.
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10-13-2020, 10:52 AM #5
Did you do a full link and sync after installing the new parts?
Dave1980 Cougar 19 tunnel,90 2.4L Bridgeport EFI in middle of restoration.
1988 BAJA Sunsport 186, 96 225 Pro Max
79 12' Auminum, 95 Merc 9.9
RIP Stu
"So many idiots, so few bullets"
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10-13-2020, 04:20 PM #6Junior Member
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