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Overhauling the leaf springs
Posted: Wed Aug 11, 2021 7:28 pm
by martinclan
I was going to have some new leaf springs made, but careful examination of the originals probably means that won't be necessary. The fact they have been supporting a somewhat lighter Marlin Roadster for 40 of their 50 years is probably a factor...
Today I gave them a good clean and they seem in very good condition. I have compared them to a new unused spring and there seems to be little or no sag. The question is, is it worth the hassle of stripping them down into the individual leaves? The only benefit I could see doing this would be to replace the little buttons (nylon?) that sit between the springs. Are these even available?
Also... The spring eye bushes look servicable although I would ideally like to replace them. Are they still available?
Cheers, Robin
Re: Overhauling the leaf springs
Posted: Wed Aug 11, 2021 8:55 pm
by MarinaCoupe
I bought some nylon slider pads off eBay recently (delivered from Singapore or somewhere). Polyurethane bushes are available from Superflex here
https://www.superflex.co.uk/products.php?cat=234
Re: Overhauling the leaf springs
Posted: Thu Aug 12, 2021 4:27 pm
by martinclan
Thanks Chris
Something else I would like to try and clear up :-) The parts list I have lists different bushes for the front and the rear of the spring. Yet mine appear to be identical. Any clues anyone?
In the parts list they appear as:
21H 5722 - Front
21H 5732 - Rear
Cheers, Robin
Re: Overhauling the leaf springs
Posted: Thu Aug 12, 2021 8:50 pm
by MarinaCoupe
They are the same, BL in common with many other manufacturers use different parts numbers as a way of identify problems. For example if a lot of rear bushes were being ordered, then they would realise that there was a problem at the rear of the springs and not the front bush.
Re: Overhauling the leaf springs
Posted: Fri Aug 13, 2021 8:14 am
by ClaytonSpeed
Some of the spring bushes are different. If you had a later mk3 or Ital then it might have had offset centres. These are mostly on Itals but some Mk3s also had them.
Re: Overhauling the leaf springs
Posted: Fri Aug 13, 2021 9:25 am
by martinclan
ClaytonSpeed wrote: Fri Aug 13, 2021 8:14 am
Some of the spring bushes are different. If you had a later mk3 or Ital then it might have had offset centres. These are mostly on Itals but some Mk3s also had them.
Aha - that would explain it.
There is a bloke selling them on ebay and he lists different bushes for the front and rear, one with concentric bushes and the other offset. He is 100% convinced that offset ones are for the front of the spring and the concentric ones for the rear. So he may be correct then - in the case of the Ital at least....
I think i'll buy two sets of the concentric ones....
Cheers, Robin
Re: Overhauling the leaf springs
Posted: Fri Aug 13, 2021 10:27 am
by ClaytonSpeed
The offset ones will lower the centre line of the axle slightly.
They are fitted to the front of the spring
Re: Overhauling the leaf springs
Posted: Fri Aug 13, 2021 10:57 am
by MarinaCoupe
Oops forgot the Ital

Re: Overhauling the leaf springs
Posted: Sun Aug 15, 2021 10:32 pm
by locost_bryan
Wonder what the thinking was behind the concentric bushes. Presumably BL did it to improve ride or handling?