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Old 06 May 2014, 16:41   #1
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Mariner gear box noise

Hi I have my lower unit taken off and when I turn the prop shaft while in gear or not it does feel slightly notchy and does make a bit of noise if I pull up on the drive shaft the noise goes and it feels very smooth, are they all like this or does it need stripping? Or is it just the three gears resting on each other?
The prop shaft feels lovey

Thanks again Stuart
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Old 06 May 2014, 16:51   #2
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Sorry I ment when I turn the drive shaft! It feels notchy the prop shaft feels nice
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Old 07 May 2014, 16:06   #3
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Could well be a lumpy bearing, worth tugging it apart to check for the sake of an o ring.
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Old 07 May 2014, 16:15   #4
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Mariner gear box noise

My mariner gearboxes are like that, there is no preload on the bearing when its at rest. I have two spare boxes and they both do it too.

The helical action of the gears when running throws the driveshaft up, when you pull on the driveshaft you are simulating what it's like when running.

In contrast I have a Yamaha 60 gearbox and its as smooth as glass without preload.
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Old 07 May 2014, 18:41   #5
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Quote:
Originally Posted by A1an View Post
My mariner gearboxes are like that, there is no preload on the bearing when its at rest. I have two spare boxes and they both do it too.

The helical action of the gears when running throws the driveshaft up, when you pull on the driveshaft you are simulating what it's like when running.

In contrast I have a Yamaha 60 gearbox and its as smooth as glass without preload.

Hi thanks for that and it's exactly word for word that a really helpful guy that works on these every day told me today! (Adi Coulam
AC Outboards)
So now I can sleep better then last night thinking I had a gear box to strip along with all my other jobs!!
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Old 08 May 2014, 01:58   #6
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I was a bit dubious about mine but I've rebuilt them using new bearings and seals and setting the boxes up with the correct tools and new shims and they are still the same.
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