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Old 09 June 2012, 17:51   #11
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Country: UK - England
Town: chesterfield
Make: Quicksilver
Length: 4m +
Engine: Mariner 30
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Posts: 160
Thanks for the reply Desmond.
Yes your are 100% correct with us too there is no normal load anything from myself to 5 up .
25l fuel tank and battery are mounted underneath the rear seat.
I too found the best posistion for the trim pin was 2nd from bottom.
In the handbook Mariner have the WOT at 5150rpm - 5850rpm.
They have list 6 props

3 x light duty
3 x 252 x 360
3 x 252 x 332
3 x 250 x 288

3 x Heavy duty
3 x 250 x 260
3 x 249 x 236
3 x 260 x 210

Non of these seem to match my current prop 9 7/8" x 10.5" (250.82 x 266.7).
Do agrre the best way to go is get the tiny tach fitted (when it arrives) and go from there.
Its just a PITA as i can only try it when im on holiday as im miles from the sea
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Old 10 June 2012, 04:56   #12
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Pete,
when you engine is mounted on the boat where is the cav plate in relation to the bottom of the keel? Also without the engine running, drop it into gear and try rotating the prop. It's rare but sometimes the prop can spin on the hub. Have you had the prop off the spline?

Des
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Old 10 June 2012, 05:25   #13
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Country: UK - England
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Hi Des
I have had the prop off to check the bush and it looked fine.I even put it back on and in gear then put a screwdriver through the splitpin hole and i cant make it spin but i did manage to bend my screwdriver
Pictures below show engine on boat but Doel fins have now been removed.
Distance from top of transom to centre of prop is 24".
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Old 10 June 2012, 06:34   #14
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You won't be able to spin the hub by hand even if it's totally had it. Mark the bush and prop,use it and see if the marks move relative to each other.
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Old 10 June 2012, 10:02   #15
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Nos4r2 option of marking the prop and checking for movement next time your out is the best option and it was unlikely that you would be able to spin the prop by hand but if for not out for a while...........Set up looks ok to me. If anything it looks a bit low but raising your engine won't help if you still have the rpm issue. To get the boat on the plane try moving some of your weight forward. I used to stap my 25ltr tank to the floor under the bow bag (as far forward as it would go) and use the bow bag to contain any heavy items (anchor / chain etc). This used to work great even when towing the kids on the toys.

Des
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