[DeTomaso] Wheel bearing issues - edited to where it makes a little sense

[Dick Koch]

Fred, what a garble de goop message.  Sorry about that.

It should have read as follows:

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

Timken told me it is a matter of skill and mostly the time available 
that should guide folks in determining which technique to use.

In my prior discussions with the Timken techs when I was designing my 
axle conversion, they said they don't push the preload technique for 
general use for the reason I gave.  The end play technique provides 
"acceptable " results.  The preload technique is preferred but not for 
general use. 

Dick Koch - Atlanta

Dick Koch wrote:
>
>
> 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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