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1996 48hp Johnson lower unit clancking

N

Nickpetrinko

New member
Hey all. I have a 1996 48 hp Johnson with lower unit issues. When put into forward and reverse gear at very low throttle it makes a clanking noise, when throttle advance slightly it goes away. there is no abnormal wigging of the prop haft, also the prop is new. First thought was clutch dog wen bad. I pulled lower unit, inspected all parts and found no signs o damage on any of the gears, shaft etc.... I had the parts already so I replaced all seals ad t clutch dog. Put everything back together and makes the same noise.
I checked all the shift linkage and all is good there.
Thought it might be the bearings on the prop shaft so I replaced them all next. You guessed it, same noise! Next I removed my lower unit again and tried my brothers lower unit ( same motor ), makes NO noise so that verifies its in my lower unit.
I have NOT replaced any of the drive shaft components or forward/reverse/pinion gears. my local machine shop verified the gears are not excessively worn. not ready to start looking for used lower unit yet.
I need help!!!!! the motor is other wise in great shape. and advice is greatly appreciated, thanks in advance
 
It may be the prop causing the rattle.-----Clutch dog on the gears.---What oil is in the lower unit ?----Try using a stick on the end of the prop as a " brake " to see if it is the prop bouncing.---Assuming this is all on a hose
 
racerone said:
It may be the prop causing the rattle.-----Clutch dog on the gears.---What oil is in the lower unit ?----Try using a stick on the end of the prop as a " brake " to see if it is the prop bouncing.---Assuming this is all on a hose
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Quick silver brand lower unit oil. Open to recommendations on different oil. Just to be clear I’m trying to keep the prop from spinning with the piece of wood correct?
 
I say a loose prop, or excessive wear in the prop splines. Try your brother's prop on your motor. Actually, I think it is somewhat common for the stainless props to make a noise when shifting while running on muffs.
 
fdrgator said:
I say a loose prop, or excessive wear in the prop splines. Try your brother's prop on your motor. Actually, I think it is somewhat common for the stainless props to make a noise when shifting while running on muffs.
Click to expand...

i failed to mention it does the same thing when in the water.
I’ve already tried changing props, same result. I’ll recheck the splines but nothing noticeable. I’m stumped 🤔.
 
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