Matchless?58 wrote:Hi Phil any chance of a pic of the new set up . I would like to check mine . Cheers Chris
its quite simple now I understand it, the bolt indicated here where the filter head connects to the spill rail needs to be a Leyland 27H6663 Banjo Bolt on the older engine with the simms filter head and injectors, its to keep 7psi of pressure in the diesel system for the pump to work properly yet still allow air to return to the tank so it can self bleed :-
jcb_banjolocation.jpg
Whats special about it is the size of the hole in it. 0.5mm.
banjo.jpg
On the older setup, its also the same size and dimension as the injector spill pipe banjo bolts, so if its not the correct one, that's the first place to check. Its effectively sticking a solid bolt in the spill connection so causes all sorts of oddness when the injector can't return its overspill back to the tank. I imagine that pot has been overfuelling and causing the weird misfire at higher rpms when it couldn't.
Charleys have them, and specify a wide range of models it fits so I think thats most of the jcb 3c range with the simms pump.
https://www.charnleys.com/part/nuffield ... banjo-boltor they're cheap on ebay too.
https://www.ebay.co.uk/itm/233641593582? - edit, I just had this turn up and its a different size and pitch than I was expecting, I'm not sure if I've messed up or its the seller got it wrong as it has no packing, but as I found my bolt in a injector I'll just write it off as experience.
Tractorspares uk has the bellows gaiter for the cold start button (and I buy stuff from them as stuff they post me actually arrives in a reasonable time frame), so next time I have occasion to order from them I'll add one on as theyre cheap also.
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