Air Suspension

Replacing the Air bags
Quite an easy job for a main suspension component. I'd already got one bag from Marcel Leisure. I ordered a second one. Free delivery, and it arrived at work within 24 hours - all ready for the weekend.

The main issue was the size of fittings, so I'll give a detailed parts list at the end. The bags are Firestone and have UNC and UNF bolts and NPT air connection. I'd only managed to find a UK source for the bags two months earlier - rather more convenient than arranging a delivery from the USA, and at £105 incl VAT and delivery I was very pleased. NPT fittings came form an Amazon supplier strangely. And UNC and UNF bolts from Southam Agricultural supplies:


New bag and piston assembly

Bottom view

All the bits and pieces
Fitted and inflated.

Fittings in place




The parts
Airbag Assembly W01-681-0212 Firestone from Marcle Leisure
Airbag itself 1T14C-3
Looks like the Firestone catalogue item but without the bump stop. 

1/2" UNC = 3/4" AF = 19.05mm See spanner sizes 
Bottom bolts UNC 1/2 "  19mm spanner fits. It needs a slim socket like my impact socket to fit in the recess on the suspension leaf. The drivers side had no recess, or it was filled with washers.

Top stud UNF 1/2" needs a washer because the thread stops a bit short. 19mm socket

Top air stud 1/4 NPT inside 3/4 UNF on the outside. Note that full nuts are 5/8 Whitworth size, but the half nuts, as shown and used, are slightly larger at 1 1/8" which has no metric equivalent.
1/4 NPT swivel elbow to 6mm push fit. from Ventus Distribution on Amazon Needs a 9/16" spanner and needs a lot of force, they are a compression fit almost.

NPT fittings just needed a final tightening a week later and now it all holds pressure.







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