Newton fuel caps
There is some confusion going on here so:
For photos see newtonsprl.co.uk
The original vans 'Luxury' gas cap is called 'A30 (L or S tandard) VNS'
Usually L for locking, has a curved flange that fits most Vans wings.
These were supplied by Vans but no longer.
Spruce part no 05-22934 A30L-VNS
If you need a flat rivet in flange the code is A30L R.
A30L-R rivet seems not to be in the catalogue. Ask Spruce and we can supply.
Usually the skin will adapt to a flat flange or the curved version equally easily.
The aero 300 -vns cap assemblies will fit into the current tanks, (if you are building the tank) but the hole in the skin is a bit oversize- I think it is OK but you need to decide for yourself.
The Aero 200 is a tiny metal gas cap, too small for most purposes.
The Aero Z2 or Z3 were designed for Cirrus de ice fluids but adapted to retrofit into the then standard Usher flanges.
So if you want to upgrade your old Usher caps, the Z3 is a good choice. Current Z3 is Spruce 05-01006.
The same page also shows an overhaul kit which works on the old Z2 caps 05-07226 called OHK Z2 which is correct despite being labelled as for the A2 series. It is hard to dismantle the Z2 without breaking the red retaining clip which is why it is part of the kit.
The small O ring goes onto the top of the lock, I think at least one chap forgot to fit it so retained the leak.
There were several changes to this cap/flange so if the OHK does not work then the only real answer is to get the Z2 flange out of the wing and re-fit new Z3. This will be a lot of work, but maybe better that the Usher cap.
Andair supply a cap remarkably similar to the Z 2 series l that developed but I do not know which version he is on so interchangeability is uncertain. Anyway he did me a favour by pushing me into the fuel valve business.
The next item is the SPRL gas cap. This is moulded in a glass/Acetal mix and comes in a red flange- It works very well indeed.
It is bullet proof but some current fuels cause swelling (mostly very old versions)
If the cap becomes hard to turn remove the collar on the saddle which engages in the upper cap.
Vans have adopted this cap as standard on all their aeroplanes in a curved flange (400mm rad as for the aero cap).
Some people want a metal version and work is in hand- but plastic (yuk...) is light and works.
I think Kahuna is talking about the Z2 retrofit caps, not the aero 300 series which is why there has been some confusion- and, for the record I do not have a clip removal tool for these caps and the cost of shipping and taxes makes return to us uneconomic which is why there are OHK's at Spruce.
Robin voice or contact Rob Selby
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