been working on a Murumba Star I bought in September and thought "I better change those tyres!" As I had a couple of newer tyres of the same spec hanging around I thought it'd be a cinch...
First to mention is that there is no arch over the wheels so the top of the tyre is obscured by the caravan wall when mounted; meaning when pulled off the hub (or put on) it first has to navigate the space between the caravan frame rail and the face of the wheel hub.
The problem I'm having is that the tyre thickness/width seems to be too great when inflated to initially be pushed up between the frame rail and the wheel hub and then sit back onto the hub. I had to mostly deflate the old tire and dig a hole to wiggle it off. The new (ish) tyre is pirated from another of my caravans that has a wheel arch but it is proving impossible to wiggle back onto the hub - it maybe that the old tyre was the original tyre and marginally different in size. (Some photos attached show my problem - no wheel arch, the new tyre sitting in front of the hub, the lack of gap between frame rail and wheel hub)
This is probably a common problem but it's my first vintage van without wheel arch. What am I doing wrong? Do I need to buy special skinny tyres or is there some obvious trick I'm missing??
Grateful for forum advice - I have temporary rego booked for this weekend and want to get the newer tyres on before making the trip.
Hi Richy, The problem you have is that you need two jacks!One to lift the axle of the ground and a second Jack to put under the main rail to Jack the van up enough to get the wheel out,back in the 60s and 70s most vans without a wheel arch or very small ones required this trick,also take plenty of blocks of wood. The newer tyres could also cause problems if they were a fatter profile to original. Hope this helps Cheers hughdeany
I'm assuming the jack under the axle raises it (and the wheel hub) which would otherwise kind of sag due to sitting on the leaf springs if one just jacked up the main rail in the side wall - yes? That would solve the ground clearance problem. Where do the blocks of wood go?
Yes - I think the other problem is the tyre width - even with sufficient ground clearance gained through the 2-jack trick. Any ideas about tyre width specs in the 60's? I'm thinking I may have to get those skinny spares that some cars have as temporary spares to use on the cvan.
Thanks very much for that trick - I'll try it tomorrow in daylight!
Hi again, The blocks of wood are to put under the jacks to give extra height ( you’ll need it) The original size tyres on most vans back then were 6.95x14 light truck,car tyres are no good as the side walls flex too much.Best idea would be to take a rim to a tyre place and find the skinniest LT tyre they have and go from there. Cheers hughdeany
Post by shesgotthelook on Dec 17, 2020 13:26:11 GMT 10
Not sure if this is the same problem or not, but it was very difficult to change the tyres on my 1950's Viscount. The tyre shop had to jack it very high to do so & I'm not sure we could change a tyre if we got a flat on the road.