slimline tank front mountings

About 3 years ago I bought a set of four for my prewar 16H and they are identical to the pair at the front of the Dommie tank. One design detail Norton never changed for well over 35 years!

As you say - shouldered bolts so they are fully tightened hard up. Top hat rubber washers above and below the tank plate and meeting each other in the hole in the tank plate. Steel disc washer with turned-up edges above and below the top hat rubbers to transfer the squeeze from the bolts.

Aren't they listed by Andover Norton? I suspect that's where mine came from.

Regards

David

That sounds OK. I can't remember if I have one flat and one cup but no matter. I'd better go and have a look rather than rely on possibly faulty memory. I'll try and take a photo later.

Pic of 16H.

The 16H picture looks correct, as long as the top rubber washer of a top hat design goes through the tank mount to make contact with the bottom rubber washer that sits in the cup.

I bought 2 of each for my 99 the year before last from RGM. The cup and shouldered bolt with very long hexagon (AF) in Stainless.

I used the shouldered bolts but I bought a lot of big rubber washers and experimented til the tank floated above the frame on a rubber cushion. I have rubber washers above and below the frame brackets.

Interesting David, my sets comprise of 12 items ,6 each side, A part threaded bolt a washer a steel cup a top hat rubber a plain rubber washer and a large steel washer . Nothing like yours!, can't find a picture or description . RGM at least give a detailed description of a top hat rubber ,but thats it.Andover has nothing, Norvil has no worthwhile decription or pictures .No one has a set.

Read the parts list. Look at the exploded drawings.Then contact Norvil or simply read their on line parts list. All of the parts are listed and priced. It is a very simple arrangement and the discussions on here are making the whole arrangement sound complex when it is not.

Tha only picture I have found us in the WD Norton manual. Page 1o has a good picture and is identical to mine. No flat washer at the bottom.

My Dommie spares list is totally confusing. Two bolts at different sizes and 2 cup washers.

Robert: According to the parts list I have for my 1961 Model 50 the petrol tank fittings are shown to be:

2ea 16237 Frame mounting rubber for petrol tanl

2ea 22081 Frame fixing bolts

2ea 22082 Rubber washers for fixing bolts, top

2ea E6743 Rubber washers for fixing bolts, bottom

2ea E6742 Steel cups for rubber washers

2ea 10914 Washers (steel) for steel cups

If I remember correctly. the bottom rubber washer has a step in it that fits inside the hole in the frame tab. Or is it the other way around?

Mike

I could not find them either. I just used tbick rubbers which once acted as bump stops for the rear shocks on a merc..others will also fit! The tank dies nit move. No vibes and it looks original at a casual glance.

I've found a picture on Norvil's web site: http://www.norvilmotorcycle.co.uk/techtalk32.htm

Fritz

PS: Couldn't remove the attachment

I know this isn't about Heavy Twins as the original article but the thread seems to have strayed away to include 16H. The attached photo shows the arrangement of the tank fixings for my 1955 ES2, which was used for many years.

This is very similar to my 1969 Mercury, although the bolt head changed from Whitworth to AF spanner sizes. The top hat washer sits on top of the frame brackets and the plain rubber washer below; this ensures that the bolt and tank are totally isolated from the frame. I've never seen or used the metal packing washer (A2/275) mentioned in the parts list, but all has worked well since buying the ES2 in 1970!

I recently purchased the stepped bolt (A2/277) and the steel washer cups (A2/279) from the NOC spares scheme. I think I bought the rubber washers from Jeff Hunter Engineering from the VMCC autojumble at the Bath and West Showground.

Philip Ham.

Previously robert_tuck wrote:

Thanks Phil and others who have replied, I think I will try that,although I dont want AF hexagons on my bike so will try to stick with the old rusty bolts. I will probably have to cut down the top hat rubbers to get to a lock up situation and it would make sense to include a thin large steel washer against the tank though it would have to be stuck to the rubber for ease of fitting. Shame no one supplies a "set" of parts that can be trusted to work.Perhaps they know the parts are a missmatch!!.

Robert,

The stepped bolt in my photo is NOS from NOC spares and is 5/16" WW.

Phil.

I've changed the setup. I' use a screw which goes to the thread in the Tank. Less fiddeling arround with the rubbers and steel cups. No more risk to damage the coating on the tank while trying to hit the holes.

Fritz

Edit:

My writing above is completley rubish. I've changed to bolts ?loctited" in the tank, instead of screws.

I don't read the NOC messages an a daily basis and have just returned to this thread to see how it ended. The initial query asked about how the front mounting was made up on a Slimline tank. After some discussion the schematic, and it only that and is not to scale, and its accompanying photo were found on the Norvil website. these clearly show exactly how the Norton mounts were designed and fitted, and from my own experience it works exceptionally well.

Then having had that information the original poster became critical of suppliers who did not supply a "kit of parts" for this arrangement. Which makes me wonder just how hard some people actually look. I know that in the modern age people generally expect to have instant solutions presented to them and so they just do not research things in depth. The advent of social media in all its forms encourages this I am afraid. So did RT actually look closely into the availability of a "kit of parts" for his Slimline tank? I know not, but Ido know that if he and others had looked at the Norvil site they would see a heading at the top of the home page which lists "Kits". Item 28 in that list is headed "Petrol Tank, and in this list arecomplete kits of parts for the fixing of tanks forHeavyweight Twins, Singles and Commandos. It lists a kit 067384: Kit: Petrol Tank: Slimline Featherbed: Including bolts.

Like I said earlier if the tank is fitted as shown in the schematic and the photo it will be secure. If you are concerned about losing a fixing bolt in use then simply Loctite them or fit locking wire. The correct bolt is stepped and when tightened it compresses the rubber the required amount to allow the rubbers to operate as anti vibration mounts. The tank itself was built with a reinforced insert into which the bolts fit so there is absolutely no need to fit a washer between the bolt shoulder and the bottom of the tank. HTH