[DeTomaso] [SPAM] Wheel bearing issues

Wed Oct 3 18:44:33 EDT 2007

Thomas,

I don't see any exceptional differences. Both the Corvette and modified 
Pantera upright employ a pair of taper bearings to mount an axle in a 
housing with a brake disc on one end and a u-joint on the other. I guess 
either preloaded or bearings with slight end play will both work.

Fred T.

Tomas Gunnarsson wrote:

>Is it possible that the application we're talking about is exceptional compared to other applications? In our case heat from braking will spread from rotor to hub long before the spindle axle is hot. This might decrease play or increase preload in a somewhat unpredictable way.
>
>Tomas
>
>----- Original Message ----- 
>From: "F&D Terry" <gt5s at bcpl.net>
>To: <arkoch at earthlink.net>
>Cc: <MikeLDrew at aol.com>; <pantera at pobox.com>; <detomaso at realbig.com>
>Sent: Wednesday, October 03, 2007 8:55 PM
>Subject: Re: [DeTomaso] [SPAM] Wheel bearing issues
>
>
>  
>
>>Dick,
>>
>>There seems to be two acceptable schools of thought concerning preload. 
>>The Corvette shop manuals for '63 forward specify a .001" to .007" free 
>>play to be within acceptable limits for the taper bearing rear uprights. 
>>>From a '63 shop manual, "The tapered roller spindle bearings should have 
>>end play of .001"-.007". Check end play and, when necessary, adjust as 
>>follows." I have owned many of these cars and have never had problems.
>>
>>Fred T.
>>
>>Dick Koch wrote:
>>
>>    
>>
>>>This interesting (to some) topic comes up every now and then.  For those 
>>>with an interest in going through the "whats, hows, and whys" of 
>>>bearings, visit the Timken automotive tech site at:
>>>
>>><http://www.timken.com/products/bearings/techtips.asp>
>>>
>>>All the issues discussed on this thread (bearings, seals, lubricant, 
>>>etc.) are covered.
>>>
>>>For a primer on bearings, Tech Tips "Volume 1" gives a quick overview of 
>>>bearing topics.
>>>
>>>For additional information, click on the "here" link at the bottom of 
>>>the page for additional automotive tech tips.
>>>
>>>As a side item, it is interesting to note that the technique of 
>>>"preloading" a tapered roller bearing, as referenced by Timken, is 
>>>preferable to the "end play" adjustment technique (see "Issue 3, Tech 
>>>Tips Volume 6). 
>>>
>>>"..... (a) slight preload can be beneficial to the success of long wheel 
>>>end life. Slight preload can improve bearing, seal and tire life, but 
>>>only if the entire process is in control. "In control" means that you 
>>>actually know the bearing setting process will result in a consistent 
>>>bearing setting range."
>>>
>>>However, that topic on preloading specifically speaks to the pitfalls of 
>>>incorrectly preloading a bearing. 
>>>
>>>"The benefits of a light and controlled preload bearing setting are 
>>>negated if bearing preload force is excessive. Excessive preload can 
>>>cause high
>>>operating temperatures, reduced lubricant life, reduced seal life, and 
>>>premature bearing damage. Bearing lock-up and/or wheel end separation 
>>>may occur if the preload force is excessive."
>>>
>>>Since it takes a skilled tech, spending the time necessary to set a 
>>>correct preload, Timken recommends in the automotive tech section to use 
>>>the "end play" bearing adjustment procedure used by the majority of 
>>>mechanics.  As per Timken, "This method requires the least skill and has 
>>>proven to be the overall best technique for general field installation 
>>>and maintenance."
>>>
>>>Dick Koch - Atlanta
>>>
>>>MikeLDrew at aol.com wrote:
>>> 
>>>
>>>      
>>>
>>>>In a message dated 10/2/07 20 42 44, pantera at pobox.com writes:
>>>>
>>>>
>>>> 
>>>>   
>>>>
>>>>        
>>>>
>>>>>What seems to have gone wrong with mikes car is a lack of lube.  I dont see
>>>>>ANY!
>>>>>
>>>>>   
>>>>>     
>>>>>
>>>>>          
>>>>>
>>>>Yeah, me neither.   Trust me, it was there at one point, not too long ago.   
>>>>What you couldn't see in the close-up photos was that there was grease residue 
>>>>all over the surface of the hub.   The grease seemed to transform to oil as 
>>>>the heat built up, and then all leaked out, apparently?
>>>>
>>>>I got both spindles off today (passenger side seems fine), and will shortly 
>>>>dismantle them both.   I aim to see if the passenger side is adequately 
>>>>lubricated or not.
>>>>
>>>>Lessons have been learned, no doubt!
>>>>
>>>>Mike
>>>>
>>>>
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