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MG Midget and Sprite Technical - Poly bush grease

Hi I have got some top trunnion poly bushes to go in . The instructions say to grease all surfaces with the grease supplied. Am I right in thinking the bushes should pivot on the pin so grease would help but be static in the top trunnion and whether greasing the outside of the bush would allow it turn ?
Thanks
Mike Fairclough

Mike, I suspect the grease is purely to make fitting the polybushes easier.

I assume the bushes do their job by flexing. They are not bearings designed to accommodate a rotating spindle and would wear very quickly if the spindle could rotate. I assume that, once they're in place and compressed to some extent, they will just grip both the mounting and the spindle.

I'm not an engineer so it will need wiser and more qualified heads than mine to confirm.

Colin
C Mee

I'm fairly sure the bushes 'stick' to the trunnion and revolve on the top pin. IIRC the standard bushes have a steel tube centre which allows this to happen.
David Smith

Thanks both , David I don’t think the top trunnion has a steel tube insert as original fitment and there isn’t one in the kit. Colin I found a You tube video from the bush supplier saying put it on all surfaces to aid fitment and correct seating so presume that’s correct . Might let the garage warm up before I venture out !
Mike Fairclough

Mike, they do. BL part 88G274 - the pic is of my original BL stock

David Smith

They invariably rust to the pin and can be a right pain to remove.
Dave O'Neill 2

I stand corrected Dave S thanks , I’m hoping it will all come apart Dave O , the car hasn’t moved much out the garage so shouldn’t be too rusted up , fingers crossed
Mike Fairclough

This thread was discussed between 09/01/2021 and 10/01/2021

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