<div dir="ltr">Makes sense. If the tech assumed it was a modern style bearing, he would lock it down. Shame, shame. Since I never work on my street cars (who has time) I only about the newer styles when a wheel bearing failed on my daughters Escort ZX2 and daddy was called in to help! I learned then that the tapered bearings I was familiar with were completely different than the modern cage assemblies we see on American vehicles. Those do get swapped and locked in place. <br clear="all"><div><div dir="ltr" class="gmail_signature" data-smartmail="gmail_signature"><div dir="ltr"><br></div><div dir="ltr"><div><img src="cid:ii_k60qwkpy0" alt="image.png" width="543" height="503"><br></div></div><div dir="ltr"><br></div><div dir="ltr">Bob Kramer</div></div></div><br></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Thu, Jan 30, 2020 at 6:50 AM <<a href="mailto:van.mulders.marcel@telenet.be">van.mulders.marcel@telenet.be</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div><div style="font-family:Verdana,Arial,Helvetica,sans-serif;font-size:10pt;color:rgb(0,0,0)"><div>Hallo Bob, the stub axle and bearings were discoloured by the heat and the stub axle was literally broken off, I don't remember anymore where. I suppose the inside threaded part was broken off.</div><div>The inspector at the MOT obviously didn't know that these wheel bearings should have some free play, contrary to modern cars. My friend felt unsure about it and he didn't argue with the MOT inspector. He also did not undo the tightening when he had left the MOT station</div><div>Marcel.</div><div><br></div><hr id="gmail-m_-3373703628010099637zwchr"><div><b>Van: </b>"Bob Kramer" <<a href="mailto:rkramer56@gmail.com" target="_blank">rkramer56@gmail.com</a>><br><b>Aan: </b>"van mulders marcel" <<a href="mailto:van.mulders.marcel@telenet.be" target="_blank">van.mulders.marcel@telenet.be</a>><br><b>Cc: </b>"TeriAnn J. Wakeman" <<a href="mailto:tjwakeman@gmail.com" target="_blank">tjwakeman@gmail.com</a>>, "fot" <<a href="mailto:fot@autox.team.net" target="_blank">fot@autox.team.net</a>><br><b>Verzonden: </b>Donderdag 30 januari 2020 12:59:14<br><b>Onderwerp: </b>Re: [Fot] Differential Pre-load<br></div><div><br></div><div>Only a post mortem on the parts could tell for sure, but it is fun to speculate. If we take the inspector at his word and the wheel bearing was “loose”, the question of why that condition existed should have been answered before tightening down the hub. Either bearing could have already sustained damage from misalignment and bringing damaged and scarred rollers back to spec could quickly result in overheating and terminal failure. <br><div>That would not be fun.<br><br><div dir="ltr">Sent from my iPhone</div><div dir="ltr"><br><blockquote>On Jan 30, 2020, at 4:08 AM, van.mulders.marcel--- via Fot <<a href="mailto:fot@autox.team.net" target="_blank">fot@autox.team.net</a>> wrote:<br><br></blockquote></div><blockquote><div dir="ltr"><div style="font-family:verdana,arial,helvetica,sans-serif;font-size:10pt;color:rgb(0,0,0)"><br><div>TeriAnn,</div><div>Some years ago, a friend of mine took his freshly restored TR4 to the MOT. There he was told he had to adjust the front wheel bearings. He tightened these there and then to pass the MOT and on the way home a stub axle broke off because the bearing had seized, luckily without too much damage : besides the stub axle and brake caliper bracket, a wing had to be repaired.</div><div>Marcel</div><hr id="gmail-m_-3373703628010099637zwchr"><div><b>Van: </b>"fot" <<a href="mailto:fot@autox.team.net" target="_blank">fot@autox.team.net</a>><br><b>Aan: </b>"fot" <<a href="mailto:fot@autox.team.net" target="_blank">fot@autox.team.net</a>><br><b>Verzonden: </b>Donderdag 30 januari 2020 10:16:08<br><b>Onderwerp: </b>Re: [Fot] Differential Pre-load<br></div><br><div><div>On 1/30/20 2:11 AM,
van.mulders.marcel--- via Fot wrote:<br>
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<div style="font-family:verdana,arial,helvetica,sans-serif;font-size:10pt;color:rgb(0,0,0)">
<div>Barry, if that is true about the rollers/races, how do you
explain the prescripion about the front wheel bearings : you
need to back off the stub axle nut to get some play for the
bearings?</div>
<div>Marcel</div>
</div>
</blockquote>
Likewise with Series Land Rover wheel bearings. Leave them tight and
they quickly die.<br>
TeriAnn<br>
<blockquote>
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<div><br>
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<hr id="gmail-m_-3373703628010099637zwchr">
<div><b>Van: </b>"fot"
<a href="mailto:fot@autox.team.net" rel="nofollow noopener noreferrer nofollow noopener noreferrer" target="_blank"><fot@autox.team.net></a><br>
<b>Aan: </b>"fubog1" <a href="mailto:fubog1@aol.com" rel="nofollow noopener noreferrer nofollow noopener noreferrer" target="_blank"><fubog1@aol.com></a>, "Bob Kramer"
<a href="mailto:rkramer56@gmail.com" rel="nofollow noopener noreferrer nofollow noopener noreferrer" target="_blank"><rkramer56@gmail.com></a><br>
<b>Cc: </b>"fot" <a href="mailto:fot@autox.team.net" rel="nofollow noopener noreferrer nofollow noopener noreferrer" target="_blank"><fot@autox.team.net></a><br>
<b>Verzonden: </b>Woensdag 29 januari 2020 19:02:55<br>
<b>Onderwerp: </b>Re: [Fot] Differential Pre-load<br>
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<div dir="ltr">Preload is more for the life of the bearings
than the gears. You preload a bearing to take up
manufacturing tolerances and account for the anticipated
(by the manufacturer of the bearings) wear during their
life time. There does need to be some 'squeeze" between
the bearing races and the rollers or the rollers will not
roll in lubrication. If any of you have ever rebuilt the
rear outer suspension on old XKEs, the tapers roller
bearing in the outer wishbone pivots wear out because the
wishbone only moves up and down a few degrees. The tapered
roller bearings never fully rotate and cause the rollers
and race to pit. Roller bearing must roll 360 degrees
around to survive. Preload makes them do that.</div>
<div dir="ltr"><br>
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<div dir="ltr">Barry</div>
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<div style="font-family:"helvetica neue",helvetica,arial,sans-serif;font-size:13px;color:rgb(38,40,42)">
<div> On Wednesday, January 29, 2020, 09:41:34 AM EST, Bob
Kramer via Fot <a href="mailto:fot@autox.team.net" rel="nofollow noopener noreferrer nofollow noopener noreferrer" target="_blank"><fot@autox.team.net></a> wrote: </div>
<br>
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<div id="gmail-m_-3373703628010099637ydpf5f47a82yiv1894590979">
<div>
<div dir="ltr">I think the main reason a specified
amount of preload is required is that it sets it
up so that the bearings roll under mild tension.
To tight and the components slide over each
other. Too loose and they cock in place. Without
rolling, bearings will soon fail the same way a
lifter that doesn't spin fails.
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<div dir="ltr">
<div dir="ltr">Bob Kramer</div>
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