Reply
 
Thread Tools Search this Thread
 
Old 12 March 2016, 11:38   #171
Member
 
The Gurnard's Avatar
 
Country: UK - Scotland
Town: Stirling
Boat name: The Gurnard
Make: Quicksilver
Length: 4m +
Engine: mariner 25hp 2s
Join Date: Jul 2013
Posts: 978
Hi Firstrib .. I have the same outboard as you.. and do all my own servicing on it. Im not an expert though..so take what you want from my post...and ignore the rest

There is only the nylon nut holding on my prop too..its never failed or slipped in its 10 years of life. Be careful not to over torque it or the threads may strip. Like you..I used to wonder why there was no castle nut and pin.. but I donít worry now..and its served me well.

The cover is the exhaust manifold cover..and as such..water can leak out the gasket. I would be inclined to investigate it ..if water can leak out it..can it also leak into the cylinders ? See note below the diagram from my workshop manual. Looking at your photo of the cover..I would think someone has had that cover off already ? ....three bolt heads look new..the others have paint scraped off..so they should come out fairly easy ?



The trim tab you discuss .. is above the prop.. and the reason it is there is stated in this diagram...and how to adjust it too.



Hope that helps some ..enjoy the outboard ..it should be very reliable.. I have never had any issues with mine...and it has done a mile or three ..in some rough weather too.
__________________

__________________
The Gurnard is offline   Reply With Quote
Old 12 March 2016, 11:39   #172
Member
 
Country: UK - England
Town: Sussex
Boat name: Bombard, Y-162
Make: Aerotec 380, Y-Class
Length: 3m +
Engine: Mercury Mariner 15hp
Join Date: Jul 2010
Posts: 2,684
I guess the OB designers know what they are doing but a nylon nut does not seem right, Nyloc - yes - I'd get one of those with the correct thread.
__________________

__________________
Max... is offline   Reply With Quote
Old 12 March 2016, 11:44   #173
Member
 
Country: UK - England
Town: East Anglia
Boat name: Nimrod II
Make: Aerotec 380
Length: 3m +
Engine: Suzuki DF20 EFI
Join Date: Nov 2007
Posts: 3,243
I wonder if it is a metal thread in a nylon sheath? Otherwise yes one use to the correct torque and I think I'd want it swapped. Be so easy to strip out a nylon thread. My Mercury/Mariner 15hp models have been a fairly standard nyloc nut.

On holiday I carry I spare prop, two spare nuts, correct ring spanner and a block of wood to lock the prop... all in a packet within the anchor/ropes bag.
__________________
Fenlander is offline   Reply With Quote
Old 12 March 2016, 11:50   #174
Member
 
The Gurnard's Avatar
 
Country: UK - Scotland
Town: Stirling
Boat name: The Gurnard
Make: Quicksilver
Length: 4m +
Engine: mariner 25hp 2s
Join Date: Jul 2013
Posts: 978
Nope Fenlander .. .no metal threads on mine.. its nylon..or at least a very hard plastic type stuff..

It is the original nut from the manufacturer too .. so its not a problem for me .. and I doubt Firstrib will have a problem with it either ?
__________________
The Gurnard is offline   Reply With Quote
Old 12 March 2016, 11:53   #175
Member
 
Country: UK - England
Town: Retford
Boat name: Spy-sea-one
Make: Mercury
Length: 3m +
Engine: Suzuki Outboard/25/4
MMSI: 235074042
Join Date: Oct 2011
Posts: 3,473
The nut might be similar to a axle nut which is elliptical and goes round on tightening it must be right, but for me I would fit a new one every time I took the prop off
__________________
jeffstevens763@g is offline   Reply With Quote
Old 12 March 2016, 12:00   #176
Member
 
Country: UK - England
Town: East Anglia
Boat name: Nimrod II
Make: Aerotec 380
Length: 3m +
Engine: Suzuki DF20 EFI
Join Date: Nov 2007
Posts: 3,243
Good call on the side plate Gurnard (BTW hope things are well you end). I realise it's the same plate I removed to clear the solidified salt in my old Mariner 4 last year. I could see the piston through the exhaust ports so it was a good opportunity to see it was in nice condition.
__________________
Fenlander is offline   Reply With Quote
Old 12 March 2016, 12:17   #177
Member
 
The Gurnard's Avatar
 
Country: UK - Scotland
Town: Stirling
Boat name: The Gurnard
Make: Quicksilver
Length: 4m +
Engine: mariner 25hp 2s
Join Date: Jul 2013
Posts: 978
Hi Fenlander.. yup..Im doing fine ..been running round the hills lately..so not been around much. I have started servicing my outboards lately .. so shouldnt be long till I get one of the smaller SIBs on the water.

I checked the manual for the prop nut.. but it is very vague and doesnt say what it is made of or even the torque setting for it. Nor does it say renew every time. ? Its a big manual though..so I will try to look though it else where. I confess .. wouldnt know nylon from nyloc though..but its not made of wummins tights ..if that helps I was using the "nylon" word loosely

I know I take it off every year and same one has gone back on. Its a 2006 year outboard..so not new... and I have had no issues..but Im not saying Im correct as I dont know. I presumed it was ok..as the prop when spinning in use..would tend to tighten the nut..not throw it off ?

If Im wrong..feel free to correct me..as I mentioned..Im not an engine expert..but I do use mine a lot
__________________
The Gurnard is offline   Reply With Quote
Old 12 March 2016, 13:07   #178
Member
 
The Gurnard's Avatar
 
Country: UK - Scotland
Town: Stirling
Boat name: The Gurnard
Make: Quicksilver
Length: 4m +
Engine: mariner 25hp 2s
Join Date: Jul 2013
Posts: 978
Quote:
Originally Posted by Max... View Post
I guess the OB designers know what they are doing but a nylon nut does not seem right, Nyloc - yes - I'd get one of those with the correct thread.

Opps ..just noticed ....I see you are still as pendantic as ever Max.. So I will return the favour

Quote from web site linked below for the part if Firstrib wants to order a new one..they use the word Nylon too..is that Nyloc ?

A Special Molded Nylon Prop nut Fitting The 18/20/25 Hp. 2-Cycle
Mercury/Mariner Outboards (1980 & newer)
And The F9.9/15, 323cc BigFoot FourStroke Outboards.

Black Dog Marine. Outboard, Inboard Parts And Accessories
__________________
The Gurnard is offline   Reply With Quote
Old 12 March 2016, 13:14   #179
Member
 
Country: UK - England
Town: Retford
Boat name: Spy-sea-one
Make: Mercury
Length: 3m +
Engine: Suzuki Outboard/25/4
MMSI: 235074042
Join Date: Oct 2011
Posts: 3,473
Hi gurnard

good to hear your back around I must say the nut is a new one on me I guess the way it works is the threads are slightly different so the nylon thread compresses into the steel thread on the shaft to hold and is just nipped up enough to keep the prop tight.

Cheers

Just found out the thread doesn't go all the way as in the pic the bit at the end serves as a nylock so it will be just nipped to stop the thread stripping if doesn't stay tight it's kn--cked I would change every time I took it off OMO that bit
__________________
jeffstevens763@g is offline   Reply With Quote
Old 12 March 2016, 13:20   #180
Member
 
The Gurnard's Avatar
 
Country: UK - Scotland
Town: Stirling
Boat name: The Gurnard
Make: Quicksilver
Length: 4m +
Engine: mariner 25hp 2s
Join Date: Jul 2013
Posts: 978
Hi Jeff.. Im still catching up on stuff on here .. .but I see you are going to ERR with your SIB. ..and will be there for a week ? I wont go the ERR course..but will try to get down to visit you when you are at Balvicar..and bring my SIB too.. if weather allows. I want to see some things on Jura ..so perhaps we can go round it in company ? I will contact you via this forum nearer the time

Sorry for going off topic First Rib..hopefully your questions have been answered now

I will add..the nut is tight ..quite a bit..all manual says is..Place a block of wood between gear case and propeller..and tighten prop nut.

Sometimes manuals have a table with torque setting for all the nuts n bits..but I have not come across it yet
__________________

__________________
The Gurnard is offline   Reply With Quote
Reply

Tags
rib

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off





Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -5. The time now is 21:27.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.