[DeTomaso] [SPAM] Wheel bearing issues

[F&D Terry]

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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