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NITROZ9 Profile
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Registered: 04-2010
Posts: 773
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Losing power


I have a buddy at work that has a 70 something Mercury 500 on a pontoon that after about a 1/4 mile it starts losing power then dies. He said that the fuel system has been gone through from the tank (including new tank) to the carbs (including carbs being rebuilt). I told him it sounds like the top bearing in the LU is heating up and seizing.After it cools down it will start back, but when it dies and he tries to start back it turns real hard.

What do you think it could be other than a bearing, or am I on the right track?

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Jun/29/2010, 10:04 pm Link to this post Email NITROZ9   PM NITROZ9
 
Bullet20dc Profile
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Registered: 09-2004
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Re: Losing power


3 things come to mind to quickly check on them early motors
  
1, they didnt have an over heat horn so impeller may need changing or stats are toast
2. lower unit oil has drained out and is seizing / heating up
3. starter isn't disengaging after it starts due to a bad bendix drive

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Charlie B
Bullet20dc / 250XS
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Jun/30/2010, 7:13 am Link to this post Email Bullet20dc   PM Bullet20dc
 
NITROZ9 Profile
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Re: Losing power


Would one heat up enough at idle on cups to overheat in 15 minutes? His will quit in about 15 minutes on cups hooked to a garden hose. emoticon

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Jun/30/2010, 2:47 pm Link to this post Email NITROZ9   PM NITROZ9
 
Bullet20dc Profile
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Re: Losing power


heat up pretty quick if impeller was no good.
if it heats up on idle id check stats and impeller first thing. dont care about pee hole stream on a hose the house pressure will be strong enough to creat a good pee stream even if the impeller is toasr. cheap insurance any way and a simple job.

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Charlie B
Bullet20dc / 250XS
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Jun/30/2010, 5:57 pm Link to this post Email Bullet20dc   PM Bullet20dc
 
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Re: Losing power


10-4 emoticon

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Jun/30/2010, 6:33 pm Link to this post Email NITROZ9   PM NITROZ9
 


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