22mmØ propeller shaft sources? (T Norris cannot get it)

We're having problems with material supply at work and I'd say 22mm is rarely asked for (I never have). Will .2mm or 8 thou make much difference? Bear in mind also unless it's precision ground the OD will be a bit down anyway. I'd be surprised if its not 7/8 your after.
 
the new coupler is an R&D 22mm diameter hole, exactly. its what the 2GM20 requires on my boat.

We may still use T Norris for a new propeller and to turn the shaft which Aghabridge in Rochester may be able to help with now
 
This sounds a bit iffy! while I know the French tend to skimp on some things, but a 22mm is not big enough for a 2GM20. What size is your existing shaft? If you are changing shaft, coupling and prop suggest you to go 25mm.

22mm dates from the days of weedy petrol engines and 25mm/1" is the minimum for diesels - even the 1GM requires it.
 
Still too small. It may well be the original but 18hp and that length of shaft is a recipe for shaft whip and bearing wear. Really consider going up to 1" which also gives you more choice of shaft seals.
 
but then wont the stern gland, coupler and P-bracket/cutlass, hole in hull need resizing too then?

the shaft is quite short, it fits inside the cockpit footwell

1657886493414.png
 
It's probably the original engine and if it's worked fine since, uhm, the 80s, then it's probably okay to keep that shaft size, even if it looks like a broomstick! ;)

And isn't a prop shaft just a stock stainless rod which then gets machined on the end to fit the prop? I can find several 22mm or 7/8" stainless steel rod up to 3m length in the UK with Google. Are they all bent or am I being naive and prop shafts are very special sticks?
 
UK-WOOZY said:
but then wont the stern gland, coupler and P-bracket/cutlass, hole in hull need resizing too then?

the shaft is quite short, it fits inside the cockpit footwell

View attachment 138668
Click to expand...
You only have 2 bearing points - the gearbox coupling and the P bracket and the maximum distance between bearings for a 1" shaft is 1.5m. That looks well over a metre. You don't say what shaft seal you have and whether it provides any intermediate support. I know it has been there from new, but that does not mean it is right. When small diesels came in builders stuck to small shafts for a while until they found the problems. While you might accept 22mm or 7/8" for a 1GM it is crazy for 2GM and does not follow Yanmar recommendations. yes, you will have to change the shaft seal and cutless but they are pennies compared with what you are pending on a new prop, coupling and shaft. Check the ID of the stern tube, should be 30mm minimum for 25mm shaft but is likely to be more than that.
 
i know i am now confused

and i know I have a limited time to get the replacement while on the hard before the marina start charging extortionate fees
 
Tranona said:
You only have 2 bearing points - the gearbox coupling and the P bracket and the maximum distance between bearings for a 1" shaft is 1.5m. That looks well over a metre. You don't say what shaft seal you have and whether it provides any intermediate support. I know it has been there from new, but that does not mean it is right. When small diesels came in builders stuck to small shafts for a while until they found the problems. While you might accept 22mm or 7/8" for a 1GM it is crazy for 2GM and does not follow Yanmar recommendations. yes, you will have to change the shaft seal and cutless but they are pennies compared with what you are pending on a new prop, coupling and shaft. Check the ID of the stern tube, should be 30mm minimum for 25mm shaft but is likely to be more than that.
Click to expand...

the original shaft is 4.9 foot (ish)

1657895990276.png

the shaft seal is a basic stuffing box

1657896191400.png
 
You must log in or register to reply here.

Other threads that may be of interest

Y
Quick Aries 1000 anchor windless noisy
Replies
0
Views
102
yotter
Y

Share this page

Top