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kimber
United Kingdom
1529 Posts |
 Posted - 04/04/2005 : 13:41:47
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Rodney
You really are having a rough time with this car, aren't you?
I have a feeling that somebody did make some trunnion boxes once.
Still, it is often possible to reclaim worn ones. Generally, the answer is to bore the inside of the box to clean-up the ridge, although often there isn't much 'meat' there. You then need to make oversize bushes to suit the bore. I did make some once which were solid round bar with a slot (i.e. one bush per box) which worked quite well and would avoid the 'ridge' problem in future. I'm not really sure why they were split in the first place other than to allow for adjustment by shimming. Possibly to facilitate fitting the spring, as the trunnion boxes were originally rivetted. You have to drill out or carefully chisel the head off the rivet(s) and re-fit the boxes with HT bolts + nuts.
I have found the neatest way of removing these rivets without spoiling anything is to first centre-punch the rivet head as accurately as you can, then drill to a depth about equal to the head of the rivet with a small pilot drill, then about a 1/4" bit. Then use a good sharp cold chisel under the head of the rivet and give it one good belt with a heavy hammer and the head should come off cleanly. You may then be able to punch the body of the rivet out but if further drilling is still required, you'll now have a much clearer indication of the true centre.
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Edited by - kimber on 06/04/2005 11:32:42 |
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