1960 Navigator Rebuild Part TWO

Grub Screw; the screw hole pictured seems bigger than the screw hole on a spare head I have here and it looks to be the same size as the rocker cover screws. The rocker cover screws on mine are 1/4" Whitworth but the grub screw is definitely smaller. It is impossible to measure in position but my guess is 3/16"and I would expect the thread to be Whitworth. Maybe someone knows better.

Front Pipes;these are just a push fit- no gasket or sealing ring.

Here are a couple of pictures relating to '20873 rocker oilway grub screw'

There are 8 of them, two on each rocker post. They are normally installed at the factory after making the oilways to blank them off, and would not be expected to come out in service.

Having said that, I found this one had come out on its own on my most recent engine strip.

Here are a couple of pictures relating to '20873 rocker oilway grub screw'

There are 8 of them, two on each rocker post. They are normally installed at the factory after making the oilways to blank them off, and would not be expected to come out in service.

Having said that, I found this one had come out on its own on my most recent engine strip.

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picture1

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Thread appears to be less than 3/16" of an inch - about 4.5mm - and around 22TPI - but not quite!

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Hi Uli and Andy,

Your pictures of the grub screw are very useful. It immediately reminded me that I had seen a screw(as in Uli's picture) identical to this- it is the screw(3 of them) on the float bowl of the HS4 SU carburettors on my 1963 MGB. So I tried one of these MGB screws on the old Jubilee head and it almost certainly fits. I say almost certain as I cannot unscrew any of the old Norton screws and only a few threads are visible to test on. The screws on this head have been centre punched.

I measure the MGB carb screw as 3/16 of an inch UNC and it is 24TPI. These carbs were fitted to loads of old British motors of the sixties. So easy to get. Later HIF carbs are different.

Hello Uli,

It looks a decent front mudguard but a 1960's bike looks so much better with a 'proper' front number plate !. Maybe it is not legal to have this in Germany ?

Have you tried starting up yet?. You must be close on one year now into the rebuild. Doesn't time fly.

Looking good Uli!

That's a superb painting rig you have. I am jealous What paint are you using -2K, Cellulose or Water Based ? or Powder coat?

That is a nice paint set up. On another note: how did you get the photos to show up in your postings rather than just the usual link we see?

What like this? ....... !!!

You have to click the HTML button above the box and paste in an HTML link from a suitable photo hosting site .. not photobucket ... grrr!

dan

Yes, like that. It's a pain clicking on the links at the bottom of threads and waiting for photos to open.

Hi Dan,

That is a tidy looking Navigator with a competition number up front. Is it one that is used for road trials ?

Patrick

Hi Patrick, the number is a show number, it was at the Great Dorset Steam Rally, I stopped to pick up a M50 engine! It was very tidy, not far up the row there was a over head valve single being shown as an Inter .... couldnt find the owner to ask him about it!

You have more patience than me, I just gave mine a quick buff!

That looks shiny. I agree that it is a messy job - I wear an old full face helmet during polishing.

Strewth Patrick, I just use a pair of safety googles!

Strewth Patrick, I just use a pair of safety glasses!

Ah yes but the helmet keeps the dirt out of my hair. My polisher is only an old drill which I clamp in the vice but it works amazingly well.

Hi Uli

what was stopping the top yolk sitting down on the nut?

Hi Ulrich...

There is no spacer UNDER the dust cover. You have the two washers shown in last but but one photo - wrong way round. The fat washer goes UNDER the blue fork crown, and the thin washer goes under the top chrome nut. See photo of my (rusty) Electra...

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Took me a couple of goes to get mine right, but will have to go and check again now!

Wider trees will need a wider slider and top yoke, or find an earlier narrow guard.Or cut a 3/8th strip down the center of the guard and weld back together!!.

Are the yokes and trees different to the ones from the slimline?

There are often auctions in eBay.

Or from AN: https://andover-norton.co.uk/en/shop-details/14919/lower-fork-yoke-late-dominator-c-w-pinch-studs-nuts and https://andover-norton.co.uk/en/shop-details/14920/fork-top-crown-late-dominator-steering-lockversion-

As far as I know are those the wider, 7 3/8".

Fritz

Oh that is a shame as it was looking so good. But you have overcome bigger problems !.

IF you know a well equipped machine shop with the right hydraulic press equipment it should be possible to press the mudguard indents deeper with minimal damage to the paintwork and IF the paint was oven cured 2K you might get away without a respray. But that's two big IFs .

Yes you can change to the 7 3/8" yokes but that will be a very costly option unless you hit lucky. The later model Electra had the wider yokes and is the same as Dominator as far as I know.

Patrick

Previously Ulrich Hoffmann wrote:

Fritz, these are also the yokes also for early commando .

I've found some here https://www.mortons.co.uk/cbc/obm/classifieds/classdemo.php?ID=6131, searched in the browser for the term ?yoke?. The third hit is interesting

Then I've found one from Mick Hemmings (it's the part-no from the 1968-1970 Commando)

Fritz

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You could always use standard steel/aluminium mudguard while you look for another, Iâm sure that one would sell well as it is.

i have a front guard in my garage for my navigator (when I get around to starting on the project!) Iâd better check that one!

this sort of thing http://www.classicbikeshop.co.uk/frame-chassis-mudguards/mudguards.html

Hi Ulrich, You will probably find that you have to re-make the bridge to the guard as well. Shame really as the correct narrow valenced early slimline guards are scarce but do turn up. I have a couple and need a wide guard!!.

Uli, how will you attach the seat with those spacers there? I thought they were for the delux, but Iâm quite often wrong on such matters! My seat bolts to the back of the top shock bolt.

Previously Ulrich Hoffmann wrote:

Back to another question: are the spacers for the rear mudguard also painted dove gray?

Hi Ulrich.

For a standard lightweight the spacer arrangement is as your photo, but there was never a rubber washer between the long spacer and the mudguard. The original finish on the spacers was zinc plated and passivated to give the grey finish seen on many fasteners. If you have stainless spacers, I'd just leave them.

Obviously Norton/AMC did not want the hassle of painting spacers to match different frame colour options. Same with the frame spacers at headstock and lower downtube.

Won't the spacer crush the paint on the mudguard and damage it? Probably, but AMC could get their cellulose paint on very thinly.

All the best

Peter

Hi Dan,

I am sure that Uli is correct; there are two spacers there, one short and one long, and the seat leg fits between them. But you are also right as most people simple do the simple thing and make one slightly longer spacer.

Patrick

Carrying on from Peter's observations I believe that all the early frames -pre 1963- were always painted in Dove Grey so my choice would be to paint the spacers. The black frame came in 1963 and two tone was then an option. That's just my opinion and could be wrong. Whatever you do it's right- it's your bike.