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  #1  
Old 12-07-2008, 09:40 PM
askipper3 askipper3 is offline
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Join Date: Feb 2007
Location: Stuart, FL.
Posts: 232
Default Mercury Outboard Lower Unit Noises.....

I seem to be getting a loud clicking noise when above 1200 RPMs, and a slight clicking in nuetral. All sounds are coming from the lower unit. I checked the shift and throttle linkages and everything there is OK.

Everything else on the moter is fine; running nice and cool, good water pressure, no knocking at idle, etc. Good fuel and spark plugs, etc.

So, with all this said- any ideas what the problem could be?

I just hope it's not fatal.
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1984 Seacraft 20' SF. W/2004 Mercury Saltwater 150

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  #2  
Old 12-07-2008, 10:11 PM
bridgeman bridgeman is offline
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Default Re: Mercury Outboard Lower Unit Noises.....

Is the shift cable on your controls working properly? Sounds like the same problem I had on a 50 merc, wanted to jump into neutral as I throttled up.
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  #3  
Old 12-07-2008, 11:42 PM
askipper3 askipper3 is offline
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Default Re: Mercury Outboard Lower Unit Noises.....

Shift cable on controls is A-Ok.

I have it narrowed down to the lower unit(as in the problem is from there). Someone said it could be a bad bearing, or a clutch dog going bad, etc.

Just would like to have the problem diagnosed as closely as possible before I go tearing it apart.
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1984 Seacraft 20' SF. W/2004 Mercury Saltwater 150

http://i98.photobucket.com/albums/l2...LOGODONE-1.jpg
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  #4  
Old 12-08-2008, 02:38 AM
Bigshrimpin Bigshrimpin is offline
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Join Date: Dec 2002
Location: Onset, MA
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Default Re: Mercury Outboard Lower Unit Noises.....

AK - I have 4 or 5 spare lower units that will fit that motor (one from a 2002 200 and 1997 200) both are 25" shafts. If you can't fix yours, I can hook you up for a decent price. PM if you need one. Have you disconnected the shift cable and tried shifting with just the linkage. Are there any chunks of metal or heavy shavings in the gear oil? Make sure the Zinc is on there tight!! I've had a nice rattle (not including the sound of banging my head against the wall) before that turned out to be a loose zinc.
It was more of a rattle, not a click.
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  #5  
Old 12-08-2008, 09:27 AM
Fr. Frank Fr. Frank is offline
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Join Date: Oct 2003
Location: Shalimar, Florida
Posts: 2,265
Default Re: Mercury Outboard Lower Unit Noises.....

I had a similar noise from the lower on my 92 Merc 150. It would click while idling in fwd, but not in reverse. After not figuring it out, and then leaving it alone, I learned it was caused by the bearing carrier shifting backwards on the threads in the gearcase, which was cause by galvanic corrosion of the threaded portion of the gear case. I ended up rebuilding with a NOS gearcase with new clutch dog, pinion gear, reverse gear, and bearing & bearing carrier. Cost: $930.
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Common Sense is learning from your mistakes. Wisdom is learning from the other guy's mistakes.

Fr. Frank says:
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'73 Cobia 18' prototype "Casting Skiff", 70hp Mercury
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  #6  
Old 12-08-2008, 11:04 PM
askipper3 askipper3 is offline
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Join Date: Feb 2007
Location: Stuart, FL.
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Default Re: Mercury Outboard Lower Unit Noises.....

Thanks for the input. BigShrimpin' after I get the situation worked out- and if it ends up being a lower unit.......I will let you know!!!! If I can get a new lower unit for the same price or cheaper...I'll be all over it.
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1984 Seacraft 20' SF. W/2004 Mercury Saltwater 150

http://i98.photobucket.com/albums/l2...LOGODONE-1.jpg
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  #7  
Old 12-10-2008, 12:17 AM
eggsuckindog eggsuckindog is offline
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Join Date: Mar 2003
Location: Tampa
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Default Re: Mercury Outboard Lower Unit Noises.....

Here is a place for good advice maybe - I want you to call Mike at American Marine and ask for Jason, he is very good on Merc's, Mike not so much (Rudes) - tell them I said to call which will smooth that out- and ask. They will give you trouble shooting tips to help and be sure to tell them you have a classic SeaCraft they have all had them or have them
727 938 9796
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  #8  
Old 12-11-2008, 10:30 PM
askipper3 askipper3 is offline
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Join Date: Feb 2007
Location: Stuart, FL.
Posts: 232
Default Re: Mercury Outboard Lower Unit Noises.....

Cool, thanks! I'm going to do that asap.
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1984 Seacraft 20' SF. W/2004 Mercury Saltwater 150

http://i98.photobucket.com/albums/l2...LOGODONE-1.jpg
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