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Old 14 June 2011, 14:51   #1
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P22 loss of drive

Took the P22 out today and on way back in engine revving but only getting 6 knots. Thought I'd picked up a plastic bag or the like, but prop clean. Shaft out of the gearbox increased rotation with the increase in engine revs, but still 6 knots. No cluncks or bangs. After a short while tried opening up again and back up onto the plane. Then back to 6 knots. Can anyone tell me if the prop has a bush in it and is this likely to be the problem? Here's hoping it is the prop!!!!!
Richard
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Old 14 June 2011, 15:16   #2
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I'm no P22 expert, however one that I used to drive quite a bit lost a whole prop blade before any bush went, so I suspect the answer is no.
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Old 14 June 2011, 16:13   #3
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Thanks for that! I'll have to have another drink and ponder!
Richard
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Old 15 June 2011, 03:26   #4
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correct me if i'm wrong,if you have a gearbox behind the engine, check it for oil
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Old 15 June 2011, 11:28   #5
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and see if the gearbox oil pressure gauge drops when it starts slipping.
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Old 16 June 2011, 13:01   #6
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Nope - gear oil correct level and pressure high (no change) when it starts slipping. Prop shaft from gearbox speeds up as the revs increase but the prop doesn't go round any faster. So I don't think its the gearbox. I'll get her out the water tomorrow or Saturday and fiddle around with the prop, and see what's what

Richard
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Old 16 June 2011, 16:16   #7
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What prop are you running. Sound like you've spun the middlle out of it

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Old 19 June 2011, 03:45   #8
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Got the boat out yesterday and it is the rubber bush in the prop. Splined centre stuck on the shaft and the prop pulled off leaving it behind, shreds of rubber all over the area. Now have the problem of getting the centre boss off !!!!.
I plan to get a new prop but is it worth getting the old one re-bushed as a spare? And if so any recommendations.

Richard
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Old 19 June 2011, 05:44   #9
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Heat and/or a mallet or drawing device will get it off. Had the same problem with mine...didn't remove prop periodically or grease the splines. Unfortunately Lancing Marine seem to be the only ones in the country who sell P22 props and last time I heard they were looking about £350 for one. I would also keep the other one and re-bush for a spare.
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Old 19 June 2011, 08:30   #10
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Originally Posted by b-pacific View Post
Got the boat out yesterday and it is the rubber bush in the prop. Splined centre stuck on the shaft and the prop pulled off leaving it behind, shreds of rubber all over the area. Now have the problem of getting the centre boss off !!!!.
I plan to get a new prop but is it worth getting the old one re-bushed as a spare? And if so any recommendations.

Richard
Don't heat it-you're too close to gearbox seals.

Give it a good blast with something like RostOff Ice-or RostOff Eco then soak it in either corrosion block, diesel or plusgas with a bag round it to stop it dripping out. Leave it for a week or so before trying to remove it.
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Old 19 June 2011, 15:22   #11
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Got it off -phew!!!! Ground two indents for the puller legs, gentle heat so WD 40 just vapourised, pulled off, but it still fought all the way.
Thanks for all for the advice
Richard
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Old 19 June 2011, 18:17   #12
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Hi, You can get it rebushed. I did the same about 15 years ago hitting a mud bank at 25 knots. Limped home at 6 knots.

I believe steel developements did the job for us.

Good luck !
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Old 19 June 2011, 19:45   #13
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I will be in Scotland today and will be talking to a chap who has a P22 aluminium prop but no P22. If he is prepared to sell I'll PM you his contact details.
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Old 20 June 2011, 05:04   #14
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Definitely get it rebushed. As Tim said, when I owned a P22 we lost a whole blade (driven in too close to Camber slip) and I was grateful to have a spare prop on board, very easy changeover.

We used to store the spare prop in the engine compartment off to one side, along with a bucket on a bit of string to hang below the leg. Pete7 was the speedy prop change expert, but I could do it pretty quick.

While you're having the old one re-bushed, consider having it re-pitched as well. Depending on the engine in your P22 it's possible to get a quite healthy increase in top speed when lightly loaded.
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Old 21 June 2011, 09:03   #15
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PM sent
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Old 21 June 2011, 10:35   #16
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Pete7 was the speedy prop change expert, but I could do it pretty quick.
You mean with night falling and being stuck 10 miles south of the Isle of Wight in the middle of the English channel, praying you don't drop the prop nut. We used to carry a small block of wood to jam in between the prop and the ventilation plate.

I had one prop taken up to 23" which gained a couple of knots.

Deffinately carry a spare, we had a bush fail on an old prop too.

Props made in Italy and imported by Stillette but its a closed shop and they won't sell one as retail instead prefer to sell lots to Lancing Marine.

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Old 21 June 2011, 14:27   #17
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Apparently Mitchigan wheel no longer make the props and the company that made the re-bushing kits stopped as it wasn't worth it, too few sales.

Wondering if it possible to get to find a re-bushing kit with the correct splines and if the outer is smaller than the original then make an alloy bush to pack it out - or just get a 2nd hand spare!

No point in changing size or pitch as I'm looking to take 8 bodies!

Richard
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Old 21 June 2011, 15:41   #18
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I think you will find that the old BMW drives used the same props, but can't be absolutely certain, so that might help find a bush.

Pete
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Old 22 June 2011, 03:01   #19
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I did spot that ddpacifics in Somerset had some props on their website recently. If you get anywhere with re-bushing your old one let me know?!
http://www.ddpacifics.com/new-parts/4541401752#content
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