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 Nissan Outboard: Cause for Concern?		  New Topic  Topic Locked
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Bruce Baker
Captain

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USA
402 Posts
Initially Posted - 06/08/2005 :  11:20:14  Show Profile
I've noticed that my Nissan 8 outboard seems to be leaking exhaust forward (towards the boat) right at the cavitation plate. It looks like there may be a seal that's failed, as it's at the joint of two pieces of motor. In the bottom piece, exhaust is expelled backwards into the water. Should this be a matter of urgent concern? I note that the motor also squeals some--It sounds more like rubber than metal that's squealing.

Thanks,
Bruce Baker
Falls Church, VA
"Yee Ha" 3573
'83SR/SK
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thacket3
Navigator

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USA
101 Posts
Response Posted - 06/10/2005 :  09:55:51  Show Profile
I have a nissan 9.8 two cycle which I bought last year. I noticed that same thing right away when I started using it. Actually, I pulled the motor out after a few uses and noticed the exhaust "oil" on the front. Then I put it back on the boat and watched it in action. I have been using it for just over a year and have had no problems with it. Very strange and concerning, but when I pulled the motor to change the lower oil, I noticed that there is a small indent in the metal. Looks to me like it's designed to do it.
Tim
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kenobie51
1st Mate

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USA
35 Posts
Response Posted - 06/10/2005 :  14:07:33  Show Profile
Bruce,
I have an Tohatsu 8 (same as Nissan), a 1994 model, which has worked flawlessly for 10 years now. Mine has the same exhaust venting you describe. I think it is designed that way to drain water when motor is raised to prevent freezing damage in cold weather use. I also believe I have the same odd squealing, whinning sound you describe. Is only appearent in a certain narrow low band of RPMs. Have not tried to find the cause. Has not caused any problem.
Larry
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Notice: The advice given on this site is based upon individual or quoted experience, yours may differ.
The Officers, Staff and members of this site only provide information based upon the concept that anyone utilizing this information does so at their own risk and holds harmless all contributors to this site.