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68 AMX trunnion rebuild |
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phatthawg 
AMC Apprentice 
Joined: Sep/15/2014 Location: Pennsylvania Status: Offline Points: 78 |
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 Posted: Sep/17/2019 at 4:33pm |
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Well, I wasn't too concerned with the lower o-ring getting squished because it's life expectancy is probably minimal anyway. I guess I will take a look at the one that didn't go down to the shoulder and see why. Then maybe lessen the torque spec to 30 ft lbs and a nylon lock nut.
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PHAT69AMX
AMC Addicted 
Joined: Jul/07/2007 Location: West Virginia Status: Offline Points: 5926 |
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Posted: Sep/17/2019 at 6:05pm |
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Was hoping for a better resolution scan, but here is a decent original AMC section image of a Trunion and components assembled onto the Kingpin:
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SCRAGTOP
AMC Nut
Joined: Jul/03/2007 Location: Chesapeake, VA Status: Offline Points: 367 |
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Posted: Sep/17/2019 at 8:02pm |
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In the bottom picture, the trunnion is clearly not seated on the steering knuckle correctly. There should be no visible gap between the bearing and the bottom of the knuckle.
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phatthawg
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Joined: Sep/15/2014 Location: Pennsylvania Status: Offline Points: 78 |
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Posted: Sep/17/2019 at 9:00pm |
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Interesting. Thanks!
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tomj
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Joined: Jan/27/2010 Location: earth Status: Offline Points: 7555 |
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Posted: Sep/17/2019 at 11:22pm |
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as everyone says above. it's a thrust bearing. the bearing has a top and a bottom, the top includes the outer dust shield, contacts the trunnion casting and doesn't move once installed. the knuckle sits up "into" the thrust bearing. before you install it (you probably have; but check out the old one) you can grasp the bearing and stick your thumb into it and rotate the inner part. i find it useful to figure out how this stuff works, in detail, then i'm not stuck trying to memorize or copy. and sometimes replacement parts don't look exactly like originals and knowing how it works helps a lot. |
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1960 Rambler Super two-door wagon, OHV auto
1961 Roadster American, 195.6 OHV, T5 http://www.ramblerLore.com |
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phatthawg
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Joined: Sep/15/2014 Location: Pennsylvania Status: Offline Points: 78 |
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Posted: Oct/08/2019 at 5:06pm |
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phatthawg
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Joined: Sep/15/2014 Location: Pennsylvania Status: Offline Points: 78 |
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Posted: Oct/08/2019 at 5:10pm |
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So quick update. When rebuilding with Prothane bushings, the pic above of a washer is the washer supplied with the kit. When installed on the trunion knuckle then the stock washer and lock nut over top and tightened down to 35 foot pounds, it leaves a gap. That's completely normal because the weight of the car and tension of the spring will close that gap to where it needs to be. All figured out between myself and the guru from Prothane.
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Ralph G.
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Joined: Apr/06/2016 Location: Cincinnati Status: Offline Points: 185 |
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Posted: Oct/08/2019 at 6:23pm |
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I’m planning on doing mine this winter. Yay.
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george w
Supporter of TheAMCForum 
Joined: Jan/27/2013 Location: New Jersey Status: Offline Points: 2899 |
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Posted: Oct/09/2019 at 7:58am |
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If the correct orientation of the trunnion bearing is open face side down ( which makes sense ) then what is the correct placement for the two different O rings and the nylon washer ?
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Long time AMC fan. Ambassador 343, AMX 390, Hornet 360, Spirit 304 and Javelin 390. All but javelin bought new.
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brownspirit
AMC Addicted
Joined: Mar/07/2009 Location: Georgetown, MA Status: Offline Points: 1021 |
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Posted: Oct/09/2019 at 8:26am |
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In case anyone is looking to avoid the prothane bushing deal, buying these trunnions from rare parts they supply you with brand new OE style bushings. As far as I know, it is the only way to get the correct bushings. I’m not trying to beat a dead horse, I just want people to know there is another option. Andy
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69' BBB AMX 390/4-speed
69' s/crambler project 69’ International F210d Cummins/5+4 |
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