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Author Topic:   Mercury Lower Unit Noise/Gear Lash
BW23 posted 10-16-2003 03:55 PM ET (US)   Profile for BW23   Send Email to BW23  
Based on one mechanic's opinion, it looks like I need a new lower unit [for my 1997 Mercury 225-HP EFI]. Motor has been making a progressively worse clank,clank sound for the past 20 hours. The mechanics said the pinion gear nut came loose and then the fwd/rev gears lost some teeth. He wanted to sell me an OEM MERCURY unit for $3700.00, and then I went shopping.

Looks like I'm getting a "new" unit from [Outboard Recycle Part & Marine, Inc.] Red Rhino for slightly less than $2000.00. Opinions on [Outboard Recycle Parts and Marine, Inc.?

Motor only has 207 hours and worth about $5000 at best.

Damn MERC's! First one I have owned and I'm loosing faith.


lhg posted 10-16-2003 04:46 PM ET (US)     Profile for lhg    
For a brand new Merc 225 lower unit, try They are advertizing $1099 retail for one. PMC is a huge supplier of re-manufactured marine engines & gearcases.
Plotman posted 10-16-2003 04:52 PM ET (US)     Profile for Plotman  Send Email to Plotman     
Why not just buy the gears. I have replaced gears in a smaller evinrude and it was pertty easy.
BW23 posted 10-16-2003 05:01 PM ET (US)     Profile for BW23  Send Email to BW23     
Prices look good. Any idea what kind of reputation they have?

This is where I was looking.


Swellmonster posted 10-17-2003 08:13 AM ET (US)     Profile for Swellmonster  Send Email to Swellmonster     
My 1998 225 EFI has loud noise in lower unit when idling in gear. I was told that it was a common noise on 6 cylinder Mercs with SS prop. Going to a different place next week.
Describe your noise, please.
BW23 posted 10-17-2003 09:10 AM ET (US)     Profile for BW23  Send Email to BW23     
[The motor is a] XXL, 30-inch shaft. Idle no unusual noise. Goes in fwd /rev with the usual "clunk" as normal. At about 2000 RPM you begin to hear a clank, clank, clank (tap a hammer on your trailer sound) and frequency increases with RPM. Aprox. 300-400 per minute at 3000-4000 RPM. Metal in gear lube looks like glitter. I'm aware of normal metal filings.

Everyone I have spoken with said that the pinion gear nut can not come off (torqued to 75 ft/lbs). I'm at the mercy of what the mechanic found and boat is three hours away.


jimh posted 10-17-2003 09:23 AM ET (US)     Profile for jimh  Send Email to jimh     
[Changed TOPIC; was "97 MERC 225 EFI lower unit".--jimh
sargerator posted 10-17-2003 02:17 PM ET (US)     Profile for sargerator  Send Email to sargerator     
I've seen more than a couple '97's thru '00 Mercs with broken lower unit cases. The breaks were in the area of the pinion gear, never saw one opened up though so can't say what caused it. And I don't know if that is problematic with big Mercs or not? I wouldn't run it until you have the problem fixed. Running at 3K and a gear binds is like a grenade going off!! Buy a new gear set and do it yourself. I've done a 115hp OMC can't be any more difficult and you save alot of $$. Also replace all the seals and bearings if your seeing metal flakes in the oil! If you pull them, go to a bearing supply store you can usually get bearings and seals for about 20% of what Dealer will sell for.
Good Luck,
phatwhaler posted 10-17-2003 06:12 PM ET (US)     Profile for phatwhaler  Send Email to phatwhaler     
My 1996 2.0l 150HP EFI SW makes clicking noises when I slow down too fast. For instance, if I gradually slow from 4500 rpm down to 1000 rpm then there is no noise. But if I just pull back on the throttle, it sounds like the prop is spinning faster than the output shaft and there is a clicking noise. Sort of sounds like the same noise your prop makes when you try to spin it with the gearcase in gear. Has made these noises since at least the 200 hour mark. Now I'm at around 500 hours and it sounds the same.
No metal in the gear lube either.

Otherwise this motor has been great. (knock on wood)

phatwhaler out.

frank_king posted 10-18-2003 10:26 PM ET (US)     Profile for frank_king  Send Email to frank_king     
buy new gear set and seal kit and have them installed by a skilled person. these gear cases should not be put together without the correct tools.
dauntlass 18 posted 10-19-2003 08:54 AM ET (US)     Profile for dauntlass 18  Send Email to dauntlass 18     
Ck out Almars in New Castle De, suburb of Wilm. De. They have a very large parts dept. Maybe some used parts are avilable.They have a very large repair shop.I had a water pump replaced there in at eight back to me same day by three pm.
Taylor posted 10-20-2003 06:57 PM ET (US)     Profile for Taylor  Send Email to Taylor     
Hard to argue with a $1099 price for a NEW complete lower unit. Given the price of Merc parts and the high price of someone with the skills to replace the gear set, I'd think $1099 is a heck of of a good deal.
BW23 posted 10-20-2003 08:49 PM ET (US)     Profile for BW23  Send Email to BW23     
I called PMC. OF course that $1099.00 price forces you to call. They quote 1399.00 (re-man) over the phone. I found a "new" Mariner leftover at Almar's in new Castle DE. It is white in color and would require prep/paint. $1500.00

I'm going to have my local guru evaluate the old one and we might try a re-build. Parts are very expensive. Thanks for the suggestions.


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