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Old 13 October 2012, 09:02   #1
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Fitting new SS Prop

I've got a new Solas SS prop to fit to a Suzuki DF90. It comes with no fitting instructions so I'm assuming - not having done this before - that it's simply a question of removing the split pin, undoing the nut, removing the old prop, sliding the new one on, put the nut back, put the split pin back.

But ...

1. There's a thrust washer between prop and gearbox?
2. Does the nut get torqued or just finger tight to eliminate end float?

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Old 13 October 2012, 10:13   #2
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Quote:
Originally Posted by Leapy
I've got a new Solas SS prop to fit to a Suzuki DF90. It comes with no fitting instructions so I'm assuming - not having done this before - that it's simply a question of removing the split pin, undoing the nut, removing the old prop, sliding the new one on, put the nut back, put the split pin back.

But ...

1. There's a thrust washer between prop and gearbox?
2. Does the nut get torqued or just finger tight to eliminate end float?

You will see how tight when you take the old one off and lay the bits out In sequence and put plenty or grease on the shaft
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Old 21 October 2012, 14:13   #3
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Fitted the new prop easy peasey after checking with Steel Developments about the nut torque (finger tight plus then wind on to first point where split pin can be fitted)

Slight but ... With the engine in forward gear (not reverse) and at idle there's a rattle that sounds like gear rattle. With the slightest whiff of throttle the rattle goes. For those of you of the right vintage it sounds just like old Mini A series idler gear rattle. It also comes and goes somewhat suggesting it's very rpm/load sensitive.

Can't check easily now as the boat is in the water and the old prop's back home - so I'm guessing somewhat here - but I recall the OE ali prop had a rubber bush twixt prop blades and hub but the Solas one doesn't??? It has a metal bush???Does this/could this account for gears resonating at idle?

Sound familiar to anyone?
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Old 21 October 2012, 17:59   #4
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Rattle is pretty common with SS props on outboards at idle speeds. I think it has to do with the weight of the prop (vs aluminum) causing lower end gear backlash.

Make sure the prop is on tight enough (may have settled in a bit on first run); other than that I don't think there's much you can do.

jky
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Old 22 October 2012, 02:40   #5
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Cheers jky. I'll check the nut tightness again when out the water
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Old 22 October 2012, 17:33   #6
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Cheers jky. I'll check the nut tightness again when out the water

I've replied to 1978SeaRider's other thread and only just seen this one.

Make sure the Prop isn't moving around on the shaft. I'm sure I had a Solas prop on my Merc and the thrust washer diameter needed turning down to fit snugly in the back of the prop. If it isn't fitted correctly it can cause all sorts of problems and damage.

Another area for noise is the fit between the prop and the gearbox. Rotate the prop by hand to make sure it's not rubbing and you have all round clearance.
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Old 23 October 2012, 03:12   #7
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Hightower, thanks

When putting it together I'd checked all fits and gaps ... The prop snugs up to the gearbox casing in the same way the OE prop did - close, but clear. There's no rotational free play prop to output shaft and with the thrust washer and nut in place and tightened there's no axial float.

I'll recheck again when the boats out the water but I'll ring Steel Developments again today to see what they say.
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Old 23 October 2012, 04:12   #8
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but I recall the OE ali prop had a rubber bush twixt prop blades and hub but the Solas one doesn't??? It has a metal bush
I'm assuming there's some kind of bushing between the prop hub & the propshaft. It's not all metal to metal is it?
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Old 23 October 2012, 04:59   #9
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Quote:
Originally Posted by Pikey Dave

I'm assuming there's some kind of bushing between the prop hub & the propshaft. It's not all metal to metal is it?
PD ... Can't remember the detail of the Solas prop now ... The Suzuki ali OE prop has a very obvious rubber bush between blades and hub.

Going to the boat shortly, I'll look at the Solas prop (though boating may be off today ... very misty this morning in Truro :-() and see what Steel Developments say when they wake up
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Old 23 October 2012, 05:19   #10
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Spoke to Steel Developments ... They confirm that the Solas prop DOES have a rubber bush twixt blades and hub and that the heavier SS prop can cause some gear chatter at idle revs.

So ... Keep Calm And Carry On
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