General: - General Auto-Engineering Question

julianps · Oct 19th, 2011, 08:44

I have to replace the trailing arm bushes on a non-Volvo.

The kit I got includes two sets of tapered roller bearings. By general concensus does it matter which way around I fit taper bearings or is there a "best practice" suggestion?

Thanks, Jules

Toplights · Oct 19th, 2011, 15:25

Most bearings are set in place so you can see their spec/size, usually etched on the front surface.

minesa240x3 · Oct 19th, 2011, 22:34

Come on jules spill the beans,Which car are we talking about?
All I know is,the inner and outer must not be mixed if you have two the same.They aren't interchangeable.They are paired per bearing.
So the inner race complete with rollers must stay with the outer race it came with.
Also taper roller bearings tend to have a "PRELOAD" setting.This is the amount you tighten the nut to capture the bearings.I'm rubbish at explaining technical stuff but if you can imagine tightening a nut with a washer underneath and then slackening it off just enough to be able to turn the washer by hand.The force needed to turn the washer is the preload.
Even I'm confusing myself now,,,,,Basically it's the force needed to turn a shaft usually measured by pulling on it using a spring scale.like fishermen use.

If you over tighten it it will destroy itself by overheating.If undertight then it will wobble and fail.

Hope this helped a bit.
Regards Brian.

wooble · Oct 19th, 2011, 22:45

Taper bearings absolutely have to go in the right way, they are set up to take force in a particular direction and will rapidly wear and fail if force is applied to them in the wrong direction.

I'm presuming you're rebuilding a peugeot/citroen rear beam if it involves taper bearings, to be honest when I worked in a garage I rebuilt one of them then gave up and started removing the beam and sending it off to a specialist for an exchange unit every time I got one. It's one of those jobs that is just not worth the time and hassle as far as I'm concerned.

julianps · Oct 22nd, 2011, 18:31

Okay, I found someone who had done a forum post.

The job is to replace the trailing arm bushes on my wife's 1999 Mk1. FIAT (as in, Fix It Again Tomorrow) Punto S60 Team.

The bearing set has two parts, a tapered carrier (with the roller bearings captured within it) and a "concave runner". The "runner" faces outwards so that, once pressed into place, the tapered bearing carrier can be offered up to it, a thrust washer placed over it then a nut, etc.

Logical once I saw it.

Many thanks all for your help.

Jules

Oct 19th, 2011, 08:44	#1
julianps Master Member Last Online: Mar 28th, 2023 16:33 Join Date: Nov 2008 Location: Aberystwyth	General Auto-Engineering Question I have to replace the trailing arm bushes on a non-Volvo. The kit I got includes two sets of tapered roller bearings. By general concensus does it matter which way around I fit taper bearings or is there a "best practice" suggestion? Thanks, Jules

Oct 19th, 2011, 15:25	#2
Toplights VOC Member 23660 Last Online: Apr 25th, 2024 23:18 Join Date: Apr 2007 Location: Surrey View Photos By: Toplights	Most bearings are set in place so you can see their spec/size, usually etched on the front surface. __________________ Old Works Motor. Malcolm and my Wheels, 1998 V70 2.5 20 Valve Auto Classic,Unmodified.

Oct 19th, 2011, 22:45	#4
wooble Stay gold baby! Last Online: Jul 24th, 2022 16:15 Join Date: May 2009 Location: Bristol	Taper bearings absolutely have to go in the right way, they are set up to take force in a particular direction and will rapidly wear and fail if force is applied to them in the wrong direction. I'm presuming you're rebuilding a peugeot/citroen rear beam if it involves taper bearings, to be honest when I worked in a garage I rebuilt one of them then gave up and started removing the beam and sending it off to a specialist for an exchange unit every time I got one. It's one of those jobs that is just not worth the time and hassle as far as I'm concerned. __________________ Click to see 240 parts I want to give you money for! Last edited by wooble; Oct 19th, 2011 at 22:50.

Oct 19th, 2011, 22:34	#3
minesa240x3 loyalty Last Online: Jul 28th, 2022 19:16 Join Date: May 2006 Location: faraway View Photos By: minesa240x3	Come on jules spill the beans,Which car are we talking about? All I know is,the inner and outer must not be mixed if you have two the same.They aren't interchangeable.They are paired per bearing. So the inner race complete with rollers must stay with the outer race it came with. Also taper roller bearings tend to have a "PRELOAD" setting.This is the amount you tighten the nut to capture the bearings.I'm rubbish at explaining technical stuff but if you can imagine tightening a nut with a washer underneath and then slackening it off just enough to be able to turn the washer by hand.The force needed to turn the washer is the preload. Even I'm confusing myself now,,,,,Basically it's the force needed to turn a shaft usually measured by pulling on it using a spring scale.like fishermen use. If you over tighten it it will destroy itself by overheating.If undertight then it will wobble and fail. Hope this helped a bit. Regards Brian.

Oct 22nd, 2011, 18:31	#5
julianps Master Member Last Online: Mar 28th, 2023 16:33 Join Date: Nov 2008 Location: Aberystwyth	Okay, I found someone who had done a forum post. The job is to replace the trailing arm bushes on my wife's 1999 Mk1. FIAT (as in, Fix It Again Tomorrow) Punto S60 Team. The bearing set has two parts, a tapered carrier (with the roller bearings captured within it) and a "concave runner". The "runner" faces outwards so that, once pressed into place, the tapered bearing carrier can be offered up to it, a thrust washer placed over it then a nut, etc. Logical once I saw it. Many thanks all for your help. Jules

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