Quote:
Originally Posted by peterux
Nice work, Robin.
Was there a reason for the bottom trunion being threaded? It seems an odd thing to do?
How do you keep the new thread lubricated, maybe some waterproof marine grease?
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The upright rotates in the trunion using the thread. It effectively un-screws and screws-up a little every time you turn the steering wheel. It's ancient technology inherited from the Morris Minor. Quite why they didn't fit a balljoint instead I will never know. There is a massive balljoint at the top of the upright where it joins to the top arm. They could have put similar at the bottom.
The thread is lubricated using one of the 2 grease nipples on the trunion. The original design only had a single grease nipple which is why not much grease ever reached the thread. And made worse by lack of regular maintenance.
My guess is that the majority of Marinas still out there have worn threads on the upright. I think as long as you fill them full of grease before the MOT the tester doesn't notice.
Cheers, Robin