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

[F&D Terry]

Your post was easily understood. I think the procedure for setting 
proper end play on Corvette axles is about as involved as doing preload 
on a Pantera. Both require a press, dial indicator and a handful of 
shims, or in the case of a spacing sleeve a lathe sure helps in trimming 
the sleeve to a proper length. Having done both, they each require about 
the same time and care to insure a proper outcome.

Fred T.

Dick Koch wrote:

>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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>>>>> 
>>>>>  
>>>>>          
>>>>>
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>>>>
>>>>        
>>>>
>>>
>>>
>>>      
>>>
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