Lower trunion to swivel pin

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Hillclimb1
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Lower trunion to swivel pin

Postby Hillclimb1 » Sun Sep 02, 2018 12:23 pm

Can anybody shed some light on this subject as I'm stuck, I got the lower trunion to swivel pin on first time, to do this I had to remove the threaded pin which fits which the bushes in the trunion, when putting it back in the swivel became real tight and wouldn't move at all. I had to disassemble it all, now the trunion won't go on. Any way around this, what do I do?
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philthehill
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Re: Lower trunion to swivel pin

Postby philthehill » Sun Sep 02, 2018 2:27 pm

The trunnion pin will not go through the bottom trunnion until it has been screwed sufficiently up the swivel so as to fit through the waisted part of the swivel.
You should be able to turn the trunnion on the swivel 180 degrees either way without the trunnion pin contacting the swivel threads
Make sure that the grease deflector tube (if fitted) between the trunnion pin bushes is moved out of the way of the swivel threads and when the trunnion is fitted aligned with both of the trunnion pin bushes otherwise the trunnion pin will not go through.


pgp001
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Re: Lower trunion to swivel pin

Postby pgp001 » Sun Sep 02, 2018 2:49 pm

There looks to be some dirt in the threads that are visible.
I would take it all apart again and make sure it is spotlessly clean before trying again.

Also have a look for any burrs on the threads.

Phil

Hillclimb1
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Joined: Tue Aug 11, 2015 10:40 pm
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Re: Lower trunion to swivel pin

Postby Hillclimb1 » Sun Sep 02, 2018 7:14 pm

It's all together now, feels alittle stiff but it's turning as should? This was an example photo, they were cleaned and grease up upon assemble.

smithskids
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Re: Lower trunion to swivel pin

Postby smithskids » Mon Sep 03, 2018 10:40 pm

Did any one notice the trunion pin shown has threads of equal length as against original has the back one shorter.

philthehill
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Re: Lower trunion to swivel pin

Postby philthehill » Tue Sep 04, 2018 8:29 am

Whilst the original BMC had unequal length threaded pins to compensate for the different thickness of the two suspension arms some pins currently produced have threaded pins of equal length so there is nothing untoward or of concern in having the lower trunnion pin with equal length threaded pins provided that the pin is fully fitted through the nut once fitted.
Another sign that the trunnion pin is not original is that it has UNF threads and not the original BSF threads.
The best trunnion pins for fitting to a Minor are those from the Marina as they are surface hardened and the production finish is superior to the original Minor specification. They are near identical to the original Minor trunnion pins but have UNF threads.



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