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MERCRUISER 30L NOISE

D

dsetsor1

New member
"I HAVE A ENGINE NOISE AT IDLE

"I HAVE A ENGINE NOISE AT IDLE OR IN FORWARD OR REVERSE. THE NOISE IS A NOCK OR A RHYTHMIC THUMP. IT IS MUCH MORE NOTICEABLE IN THE WATER THAN ON THE DRIVEWAY WITH THE WATER HOSE ATTACHED TO THE LOWER UNIT.
IT IS NOT AS NOTICEABLE AT SPEED. I RAN IT SUNDAY FOR 2 HOURS AT ABOUT 4000 RPMS, VERY SMOOTH.
IS THE TIMING OFF? COULD IT BE TIMING CHAIN OR TIMING GEAR NOISE? IT DOESEN'T IDLE VERY WELL."
 
"It could be a flapper in the

"It could be a flapper in the exhaust, they loose the rubber molded on the edges and then you have steel bouncing off the exhaust pipe. Use a screw driver on your ear like a stethoscope and if its in the exhaust keep driving it. There is no timing chain in that engine."
 
Darryl.
When was the last ti

Darryl.
When was the last time the drive and U joints were serviced and the engine alignment/coupler were checked?
 
SORRY FOR THE DELAY.
THE ENGI

SORRY FOR THE DELAY.
THE ENGINE WAS SERVICED LAST FALL. I'M NOT SURE ABOUT THE ALIGNMENT/COUPLER.
THANKS DARRYL
 
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