[DeTomaso] Wheel bearing issues

[Dick Koch]

Fred, you are right when you talk about acceptable.  Both preload and 
end play techniques work.  

    It is a matter skill and mostly time to do what Timken told me was 
the techniquethe bestof time and skill if someIn my prior discussions 
with the Timken techs, they don't push the preload technique for general 
use for the reason I gave.  The end play technique provides acceptable 
results The reason that the Timken folks gave

F&D Terry wrote:
> 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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