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Old 03 September 2009, 05:28   #1
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Engine trim tabs

I need to off set the trim tab on a 75 mariner but I cannot remember which way to off set it, anyone know which way it goes?

Cheers

Lee
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Old 03 September 2009, 06:56   #2
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That depends what your steering feels like!

If it pulls to port, turn the tab to starboard a bit, & vice versa. The actual angle will depend on your boat, prop, speed, etc etc etc.

Best bet is get a cheap socket with an extension, go for a spin. make a small adjustment (hence the cheap socket, coz if you drop it.......) try again. When it's all nicely balanced, put the plastic cap over the access hole & job done!
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Old 03 September 2009, 07:19   #3
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ermm....i might be wrong here, i thought you always turned the tab to the direction of error.

ie ...if it pulls right adjust to right, if it pulls left adjust to left.

S.
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Old 03 September 2009, 07:52   #4
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ermm....i might be wrong here, i thought you always turned the tab to the direction of error.

ie ...if it pulls right adjust to right, if it pulls left adjust to left.

S.
That's always confused me too. However, it depends on which way you're facing - in the boat or out of it.

I still don't know, but mine's ok anyway.
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Old 03 September 2009, 08:15   #5
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It doesn't actually turn the boat, all it does is loads the steering one way or t'other.

The high level version is move it one way - if it gets worse - move it the other!!
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Old 03 September 2009, 16:47   #6
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Thanks for all the replies.....I think! Next time I'm out I'll give all your ideas a go!

Lee
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Old 03 September 2009, 17:04   #7
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I seem to remember being told by a man who knows about these things that you offset the engine and turn the trim tab both in the direction of prop rotation. Not that I've ever found adj of the trim fin alone of any use at all.
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Old 03 September 2009, 17:08   #8
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I've been told if your bow is wondering to the right you adjust the trim tab to the right (your right if your out of the boat and facing the transom), same goes for the left.
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Old 03 September 2009, 17:41   #9
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I've been told if your bow is wondering to the right you adjust the trim tab to the right (your right if your out of the boat and facing the transom), same goes for the left.
Yep! Says something like that in my instruction book too. It seems illogical.
Can anyone explain the physics of it?

Maybe it's quantum physics.
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Old 03 September 2009, 17:48   #10
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well I was told its cos its not a rudder-as there is a pivot in front of it on the engine leg. But as you are normally fighting the prop torque I have always found offsetting the engine to be the answer.
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