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Author Topic:   1998 Merc 225 noise
Swellmonster posted 08-08-2003 07:13 AM ET (US)   Profile for Swellmonster   Send Email to Swellmonster  
At idle, in gear, my motors lower end is very noisy. I spoke with a mechanic and he said that is a problem with big mercs with a stainless prop.. The noise goes away with a bit more speed. He sold me a plastic type spacer/insert that goes on the prop splines to correct the problem, but it did not fit.
Any sound advice?
lhg posted 08-08-2003 02:34 PM ET (US)     Profile for lhg    
Not familiar with the 225 lower unit, but I wouldn't rule out a bearing problem. Sometimes lower unit bearing noises are transmitted up to the powerhead.
Swellmonster posted 08-08-2003 10:01 PM ET (US)     Profile for Swellmonster  Send Email to Swellmonster     
Its kinda done it since day one but I was so excited to drive it and just got used to it. Its still under warranty, not sure if its a problem. I never see metal shavings when changing the lower unit oil...
SuburbanBoy posted 08-09-2003 01:21 AM ET (US)     Profile for SuburbanBoy  Send Email to SuburbanBoy     
I would guess that there is nothing wrong, just a little free play in the gear set and it is agrevated very slightly uneven idle. My Tohatsu 70 will do the same, and only with a stainless prop, and only at idle. The mass of the stainless prop is much greater than the aluminum prop. This may help to magnify any rattle in the gear train set off by a slightly erratic idle.


jimh posted 08-10-2003 10:52 PM ET (US)     Profile for jimh  Send Email to jimh     
Is this an engine that shuts off two of its six cylinders at idle? This may affect the vibration problem.
Swellmonster posted 08-11-2003 10:56 PM ET (US)     Profile for Swellmonster  Send Email to Swellmonster     
I dont think so. But I "think" I read somewhere that it will drop a few cylinders for shifting....
SuburbanBoy posted 08-16-2003 03:31 PM ET (US)     Profile for SuburbanBoy  Send Email to SuburbanBoy     
Droping a couple of cylinders at idle may contribute to the uneven idle.


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