This item is for a set of Cylinder Head Sleeve Nut Washers, of the type fitted to most SOHC cast iron cylinder heads (both International and CS1).
These are CNC manufactured to fine tolerance and in stainless steel. Price is for matched set of 4 sleeve bolt washers.
Background and Fitting Information:
These Sleeve Nut Washers are of the slimmer (1/8" thick) type, which was normally fitted to SOHC Cast Iron cylinder heads - under the Sleeve Bolts, and ensured a hard surface for tightening down the sleeve bolts.
Note we also sell the thicker (1/4" thick) type - Item 1015, which were normally fitted to alloy or bi-metal SOHC and DOHC heads - so if you are replacing a set of existing washers on your cylinder (as originals often get chewed), then it is worth checking what thickness your original washers were - as previous owners may have changed the thickness of the washers on your own engine - and changing this thickness will alter the height of the cambox and subsequently, the Oldham Coupling thickness requkired and possibly valve clearance.
Although the later (thicker) type were listed in the 148 Spare Parts Catalog as Norton Part Number 1015 (intended for alloy heads), this slimmer type were normally fitted to Cast Iron heads - but strangely were not shown seperately in Pre-War spare parts catalogs. However, as far as I am aware, most International and CS1 cast iron cylinder heads were fitted with a seperate steel sleeve washer (of 1/8" depth), and if you look at the photograph of the original pre-war cast iron International 500cc head in this listing, you will see that the original sleeve washers are still in place in the two front recesses (which have a full recess all the way round), but have come detached on the rear recesses, as they are open on one side. But this allows you to see that when our fitted, our washers are the same thickness as the original washers.
As far as I am aware these washers were fitted to all International and CS1 cylinder heads (and probably the early solid bronze racing heads), but if you are replacing your original washers (which often get chewed, and are no longer flat), it is worth checking the width, as previous owners may have replaced them with later thicker washers (our Item 1015) - which will affect the cambox height on re-assembly.
It is very important that when fitting these washers, that a 'matched' set are used - i.e. they must all be the same thickness. Likewise, your sleevebolts should all be of the same batch and length - as the cambox is placed on top of these 4 supports, and if any of the 4 pillars are of a different length, it risks breaking the rear legs off the cambox casting (the worst issue to have with this engine design).
We CNC manufacture these Sleevebolt Washers to the standard Norton depth, but also ensure they are checked with a micrometer as a matched set of 4 before packing - they should all be within 1 - 2 thou tolerance of each other.
Final point on fitting - as original iron heads were made for many years (with slight machining variations) - you should double check the width of recess on your original head (particuarly the full recesses at the front) and if you think the new washers are too wide to lightly tap into place - then their outer diameter can be lightly linished by attaching a flap wheel in an electric drill .
Once fitted, you should double check they have all seated properly, by laying the cylinder head down on a flat surface, and using s a depth gauge to ensure each sleeve nut washer is the same height from the base of the cylinder head.
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