Studs!

Dan Gurney · 22 February 2014, 17:02

While gszing st my engine during a break in trailer fettling i noticed that the nuts which hold the steering bracket on were rusted to buggery, to the point where bits were flaking off. So I had a go at getting them off (it's not the sort of thing you want to fail at sea!)

Turned out that they weren't as rusty as all that after all:

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I'd like to reattach the bracket with some nice stainless locknuts, anyone know what size they ought to be for these studs? (It's a 1993 Yam 85AET by the way)

Cheers,

Dan

Dan Gurney · 23 February 2014, 01:52

Boink! Anyone? Owners of mid-90s yam w strokes?

biffer · 23 February 2014, 08:44

Take a nut off of something else, I can see a couple on your transom, try them, if it fits use that as a guide, difficult to tell without any reference point but I'd guess at M 10 or 8

Jizm · 23 February 2014, 09:42

We did those on the mac rib didn't we biff? M10 me thinks.....

matt h · 23 February 2014, 09:42

I've got a couple of new ones to go on mine.. it wasn't metric if I remember it was a unf thread, will try to find them today

biffer · 23 February 2014, 10:00

Quote:

Originally Posted by Jizm

We did those on the mac rib didn't we biff? M10 me thinks.....

Yes we took them off but put them back on. Didn't really look at them

yam man · 23 February 2014, 10:05

M10x1.25 pitch

biffer · 23 February 2014, 10:45

I thought it would be metric but wasn't sure, my way of thinking was that Yamaha would never have seen a unf Type thread

yam man · 23 February 2014, 11:00

Quote:

Originally Posted by biffer

I thought it would be metric but wasn't sure, my way of thinking was that Yamaha would never have seen a unf Type thread

The only unf thread I know they use on the heat exchanger straps on the diesel .

matt h · 23 February 2014, 14:17

Ok found them,, the M10 nut and bolt in my pic (sorry can measure the pitch) is not the same as the new yam nuts, its screws on 1/2 turn and locks....its a slightly finer thread hence I could not find any new nuts to suit and had to order them...you can visually see its slightly different.etc
These are the part numbers for your 85hp, 90185-10051
NOW im assuming your thread is the same as the Yam 90 two strokes and the same as my 2004 60 t/s which is what I have here.
A pure guess that yours is the same thread..and they have just altered the part number 25 years down the line to the pt no i have shown.

By the way, you can have them for £100

I would send them up to you but i need em!

RIB-Teccie · 23 February 2014, 14:35

They should be M8x1.25 thread. There are 3 metric threads 1.5, 1.25 and 1.75. It is possible to save yourself hassle by getting an M8x1.5 die nut and cut a thread and fit a standard stainless m8x1.5 locknut, because sometimes when you remove the stud, it kindly removes the thread in the steering tiller. Which makes one say some very rude words indeed!!

RIB-Teccie · 23 February 2014, 14:38

The 4 main gearbox bolts are M10x1.25

matt h · 23 February 2014, 14:52

Its not a M8 Rib teccie..as the bolt would not have screwed in the the new nuts i have.. well aaarf a turn anyway.

biffer · 23 February 2014, 14:54

Quote:

Originally Posted by matt h

Ok found them,, the M10 nut and bolt in my pic (sorry can measure the pitch) is not the same as the new yam nuts, its screws on 1/2 turn and locks....its a slightly finer thread hence I could not find any new nuts to suit and had to order them...you can visually see its slightly different.etc These are the part numbers for your 85hp, 90185-10051 NOW im assuming your thread is the same as the Yam 90 two strokes and the same as my 2004 60 t/s which is what I have here. A pure guess that yours is the same thread..and they have just altered the part number 25 years down the line to the pt no i have shown. By the way, you can have them for £100

I would send them up to you but i need em!

Some of them nuts you're showing are for the steering linkage, they are not the same as every other bolt on the main engine

matt h · 23 February 2014, 15:06

Agreed Biff. they are not the same as probally any other bolt, but for some reason the two nuts holding the Steering Hook on as in his picture have a different thread..and i cant bloody remember what it was,,

This is Nuts ha ha.. i'm hittin the wine now so god knows what thread it will be in an hour dude!!

We should consult Peterm and Whisper..... (wingnut and his mate Splitpin!!)

RIB-Teccie · 23 February 2014, 15:07

Yep, I've had a look, they are M10x1.25. Sorry!!

Photo shows an M8x1.25 and an M10x1.25 with one of the nuts in place. These are all yam parts.

matt h · 23 February 2014, 15:12

You should sell him that nut for the entertainment factor!!

RIB-Teccie · 23 February 2014, 15:26

He'd have to drive into Leeds from bingley!! Seriously though, I only have the one, I will be ordering some soon anyway.

biffer · 23 February 2014, 15:33

Must be a bugger up there to get bits,

Dan Gurney · 23 February 2014, 15:51

Quote:

Originally Posted by biffer

Must be a bugger up there to get bits,

All has to be mail order which means it takes ages to get anything done!

I found that part number at 1993 C85TLRR Yamaha Outboard Parts so I'm hoping Solent Yamaha will sell me one with my service stuff.

Just out of interest what it the 'standard' thread you'd get on an M10 nut. I have some M10 locknuts that I ordered to go with the threaded bar I'm using for my trailer brakes. There were no thread options when i ordered.....