Trunnion Replacement

[Chipper]

I would imagine the discs/washers on the fulcrum pin can be extracted using Mole grips or similar, then the pin can be pushed/pulled out. You could also try replacing one of the nuts on the thread and gently hitting it with a hammer...

[bmcecosse]

I can only assume these are stepped washers to locate the pin between the 'arms' of the wishbone. Remove them to see what lies below!

[philthehill]

This same item is also being discussed in General Discussion.

[bmcecosse]

Same conclusion on two threads - so it must be right! It IS the only possibility.

[Adrian Nugent]

cool thanks for the advice guys,I will give it a try!

Adrian

[rayofleamington]

Hey Adrian,
Thanks for the photos - that really made me chuckle.
We'd have really gone round in many circles trying to re-explain how to disassemble the Minor lower suspension arms & torsion bar assy, when you don't have them!

Do you know what other modifications the car has? Yours has the full front suspension coil over & lower wishbone upgrade (fairly useful kit, especially on a track day car, but not just for that).The JLH front suspension kit is only one of their available upgrades - often people will add trick rear suspension, bulkhead stiffener etc.

Ray.

[Adrian Nugent]

I think that may be the only upgrade I have, I am pretty sure the back suspension is standard leaf springs.
are you familiar with the process of changing the trunnions over with this setup? I called JLH this morning and they weren't too sure without seeing how it has been set up. I will look at sending them some images later today to get a better opinion from them.

Thank you

[Adrian Nugent]

will I still need to jack up the rear of the arm to take the load from the torsion bar? I thought the torsion bar was removed from this set up, if I do will the kingpin shoot back down under the load of the coil after it has been compressed?
It looks to me like I may need to unscrew the A-frame from the coil and pivot the frame down away from the trunnion while I replace it, then re-attach the coil and trunnion. is that reasonable or totally wrong?

Thank you

[bmcecosse]

You don't have a torsion bar - just a coil spring! Fit rebound stops before doing anything. It's also possible the swivel pin used with that front wishbone needs to be slightly longer on the threads than a standard one - maybe not. It seem ridiculous that JLH weren't able to tell you what you need to do - who did you speak to ??? I suggest you jack under the wishbone to lift the top arm off the rebound stop (which you will have fitted...) then protect the ends of the threads of the pin by screwing on a nut and gently tapping the pin back and forth to release the stepped washers. It may only go in one direction - so don't tap too hard till you get some movement!

[Adrian Nugent]

I'm not sure who I spoke to, if I had a better understanding of the mechanics of the suspension it would have been great advice, but he gave me a couple of options and i'm afraid at the moment I need some visual direction as opposed to text or spoken.
they gave me a couple of options but no definitive 1 way to tackle it. they said i could send some pics and they would send back some annotations. I was told not to replace the fulcrum pin, that one I have in there is made for that kit.

thank you

[bmcecosse]

Yes -that's rather what I suspected. So you need to hope the pin is not worn - or presumably they can supply. Just follow my advice - it will be fine.

[Adrian Nugent]

thank you, I will try it.

[philthehill]

If you need a longer lower trunnion pin the Marina/Ital is the one to use. It has longer threads (3/8" UNF) each end but it is the same dimensions through the trunnion.

[bmcecosse]

I bet that's what they use! Good tip Phil.

[Adrian Nugent]

Heya guys, I attempted the trunnion change tonight but I was thwarted!! I got the drums off unscrewed the backplate, but I could not get the grease dust cap off from the center of the wheel. The backplate is stopping me from spinning the trunnion and I can't move it till the cap is off. I tried using a flat head screwdriver to get the cap off but it was too thick to get underneath to pry it off. Any ideas?? Other than that I think I can do it, just one more obstacle! Any specific tools other than a screwdriver to get the grease dust cap off??
Thank you

[chesney]

Generally a screwdriver has worked for me, start with a thin blade, work up to a larger blade. If that doesn't work, maybe a set of grippers, or if desperate, a large screwdriver well-aimed could make it 'spin'.

[millerman]

]Contact JLH for advice

[Chipper]

Heya guys, I attempted the trunnion change tonight but I was thwarted!! I got the drums off unscrewed the backplate, but I could not get the grease dust cap off from the center of the wheel. The backplate is stopping me from spinning the trunnion and I can't move it till the cap is off. I tried using a flat head screwdriver to get the cap off but it was too thick to get underneath to pry it off. Any ideas?? Other than that I think I can do it, just one more obstacle! Any specific tools other than a screwdriver to get the grease dust cap off??
Thank you

I generally use large water pump pliers. But as said above, you could also use a cold chisel and whack it with a club hammer to get it at an angle, then use a flat-bladed screwdriver to prize it out.

[bmcecosse]

The car has fancy suspension - yet still on drum brakes ?? Amazing.... Yes biff it off with a small chisel/old screwdriver and a hammer. Note that the nearside hub nut is left hand thread..as is the trunnion.

[Chipper]

It does indeed seem a bit at odds to have 'race-spec' suspension and Goodridge braided brake hoses, yet still retain the stock drum brakes!

I guess the previous owner cared more about speed and handling than they did about being able to stop quickly...