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Gridgway
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Trunnion maintenance

Probably a well trodden question, but I have realised that in my live axle car refurb, I thini I need to pay more attention to the trunnions than I was going to.

As it's new to me, although only having done 9,000 miles since new, I don't have any idea of the state of the trunnions, whether they are worn or not, oiled or greased or neither.

Any recommendations on what to do?  Are they easy to take apart, inspect, clean and put back together?  Anything to look for?

Cheers, Graham

Englishmaninwales
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Remove, disassemble and degrease. Examine the threads on the upright and trunnion.Place the outer portion and check for any play.  Any wear, replace. Obviously if the thread on the upright is worn, this will require replacement. Replacements are available with poly bushes which are far better. Remember they are handed. Make sure the eyebolt is assembled anti -seize (Removal can be a problem if it was assemble without any last time!). Reassemble with EP 90 or grease (your choice, do a search, loads on this argument)

Malcolm

Gridgway
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Thanks, I should have done this with the suspension apart (dampers went off to be serviced, did new bushes in the lower wishbone and refurnbed the calipers with enw seals!).  The good news is that I know it comes apart easily.

Nigel Riches
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If your trunnions have a swaged in steel disc on the bottom you will probably find they leak if you use oil lubrication. However this can be remedied by degreasing and being scrupulously anal about getting any contamination out of the area where the disc is installed, being sure the area is dried thoroughly, then apply some wicking grade Loctite from the outside, around the swaged joint. I have done this and have no oil leaks.   

Gridgway
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Thanks, that's helpful.  I'm feeling a bit annoyed with myself for coming back to it after having had the front suspension apart, but I need to check for lubrication and wear.

I'm minded to go for the upgrade kit to sphericals, but I don't know if it just fits into the Caterham lower wishbone and top balljoint.  Nor how hard it is to get the stub axle out to change over.

I think people on here have done it though.

Gridgway
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Updating this, I took the front uprights off and apart to ge the trunnions off.  They were badly libricated with grease and seem to have wear and a lot of play.  Even though I quite like to keep it all original, I think I'll upgrade to the spherical bush replacement kit.

Tazio
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The Canley Classic one?

Gridgway
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Yes, that's the plan assuming they have stock

Gridgway
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In an unexpected turn of events, Canley have siad that their kit is not suitable for the Caterham wishbones, it's designed for the Tirumph lower wishbone only.

I think I need to think again.  My race car fabricator can probably modify the lower wishbone to add a bearing carrier for a spherical bearing, then I can use the Canley upright/link.

Or I can buy some new trunnions and move on!

Tazio
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Have a chat with David Sutton, Sooty on here, he's did the conversion about a year ago using the Canley kit.

Cheapest is new trunnions and this time lube them with EP90, not grease them, or you can go the whole hog, new uprights, new lower wishbones with spherical bearings, and if you have the classic upper wishbones replace them too. Not a cheap solution, but doable if you wait for the Academy guys to move from narrow track to widetrack, and get a set of wishbones cheap.

Alan

anthonym
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I kept my trunnions because they are true to the era - and I gather cannon run on them and still work. - anthony