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Author Topic:   Drive-train "Clunking"

bradenton whaler posted 08-06-2001 05:38 PM ET (US)
22'Dauntless, 200 hp Mercury, 2000 year. When in idle, engine (or prop) clunks periodically as if it's hitting something in the water. Has happend once or twice at cruise speed. Also stalls occasionaly at idle. Engine has less than 100 hrs. Checked lower unit oil plugs and no metal shavings.
bradenton whaler posted 08-06-2001 05:42 PM ET (US)
Question: Does anyone know what may be causing this? If so, how can I fix it?
bc posted 08-06-2001 08:47 PM ET (US)
I know what you mean on the clunking, when you go from neutral to fowards or reverse. My buddies 175 does it and I've heard numerious other 175 to 225 hp do the same thing. My friend was told that this was normal. Letting the motor idle down then moving the lever quickly seems to "soften
" the clunk. See if they can raise the idle rpm on the motor. These motors don't like to idle they want to scream.
lhg posted 08-07-2001 12:35 AM ET (US)
Engine idle should be set at 600rpm (in gear) with this engine. Also your problem could be improperly adjusted shift linkage at the engine.
FISHNFF posted 08-07-2001 02:15 AM ET (US)
Mercs are notorious for this. Sounds like someting is broken. Try putting motor in gear on flusher (Be very careful!) and will sound like lower unit is coming apart. Dealers say normal for Mercs. On my 4 stroke, have horrible clattering sound when pulling throttle back to idle in gear from WOT. Some of the heavier SS props really make a loud clunk into gear. My Merc has a switch on the throttle linkage which lowers RPM when going in/out of forward to ease shifting.

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Author	Topic: Drive-train "Clunking"
bradenton whaler	posted 08-06-2001 05:38 PM ET (US) 22'Dauntless, 200 hp Mercury, 2000 year. When in idle, engine (or prop) clunks periodically as if it's hitting something in the water. Has happend once or twice at cruise speed. Also stalls occasionaly at idle. Engine has less than 100 hrs. Checked lower unit oil plugs and no metal shavings.
bradenton whaler	posted 08-06-2001 05:42 PM ET (US) Question: Does anyone know what may be causing this? If so, how can I fix it?
bc	posted 08-06-2001 08:47 PM ET (US) I know what you mean on the clunking, when you go from neutral to fowards or reverse. My buddies 175 does it and I've heard numerious other 175 to 225 hp do the same thing. My friend was told that this was normal. Letting the motor idle down then moving the lever quickly seems to "soften " the clunk. See if they can raise the idle rpm on the motor. These motors don't like to idle they want to scream.
lhg	posted 08-07-2001 12:35 AM ET (US) Engine idle should be set at 600rpm (in gear) with this engine. Also your problem could be improperly adjusted shift linkage at the engine.
FISHNFF	posted 08-07-2001 02:15 AM ET (US) Mercs are notorious for this. Sounds like someting is broken. Try putting motor in gear on flusher (Be very careful!) and will sound like lower unit is coming apart. Dealers say normal for Mercs. On my 4 stroke, have horrible clattering sound when pulling throttle back to idle in gear from WOT. Some of the heavier SS props really make a loud clunk into gear. My Merc has a switch on the throttle linkage which lowers RPM when going in/out of forward to ease shifting.