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Old 08-11-2019, 11:29   #16
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Re: Max Prop v1 - locking collar

Here's a photo I received from Fred Hutchinson at PYI, when I was working on this issue on my boat. There's two half circles, one on the hub and one on the collar. When aligned, they're tapped for a metric 4 x .7 or 5 x .8 screw. Grub screw or similar
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Old 08-11-2019, 11:55   #17
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Location: Auckland, NZ
Boat: Hood 38 - Wauquiez
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Re: Max Prop v1 - locking collar

Thanks to all here. You are completely correct the support at PYI is outstanding, and I would by there products again in a heartbeat for the support alone.

As it turns out we have a MaxProp VP. A pin inside the unit must have sheared as the locking collar does not (at present) lock.

We are putting in a temporary fix which will be a temporary locking pin fixing the pitch.

Its a Hood 38 with a 48 HP Perkins 4108, 2:1 reduction on 18" prop, so we think the pitch should be between 9 and 11 inches. I am favoring more towards the 9" at this stage (unless anyone knows better).

Al
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Old 08-11-2019, 15:28   #18
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Re: Max Prop v1 - locking collar

Just to add to my comments about PYI. They really were great. The comments form on there website got a reply almost right away. They were happy to tell me about a temporary fix for the problem, and were able to communicate via phone and even sent a short video showing how to do the repair.

Needless to say I have not brought any parts from them yet as we are doing the repair, but if I ever need a prop I am going to PYI, even if only from a service and support point of view (which is truly outstanding).

I wish all companies had this sort of culture. I owe them a few beers next time I am in WA.
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Old 08-11-2019, 16:15   #19
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Re: Max Prop v1 - locking collar

Quote:
Originally Posted by BigAl.NZ View Post

Its a Hood 38 with a 48 HP Perkins 4108, 2:1 reduction on 18" prop, so we think the pitch should be between 9 and 11 inches. I am favoring more towards the 9" at this stage (unless anyone knows better).

Al

I've had my max prop since 1985 when the boat was brand new and it is a great prop. I too have a 4108 Perkins with a tranny of 2.1: 1 reduction on a 17 inch prop. The boat is a 37 foot Tayana with a loaded displacement of close to 30000 pounds. The fix prop that came with the boat was a 17 by 11 inch pitch which I never used and so the max prop was used from the get go. At first I set the pitch close to that 11 inches, but did not think it gave good speed so I increased the pitch to the next higher setting. My prop does not have the collar and every 3 years when I hauled the boat I needed to apply grease which I needed to completed take the prop apart. Several years ago I got the zirc fittings so disassembly is no longer required unless I want to change that pitch. I cruise at 6 plus knots at 2500 rpm and wot is at 3000rpm. I'm a little over propped but the Perkins is doing fine after 35 years so no complaints. You have the 18 inch so your mileage may vary. PYI is a great company.
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