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RE: (ET) rear end oil change [Virus checked]



I would not get to hung up on the sealing issue between thick and thin. The
sealing requirements for the drive unit shouldn't be any different than
that for a engine other than the possibly heat tolerance. If the thinner
lube leaks out it is because the seals and/or shaft are worn. In my past
life, designing the Aerostar AWD system, the front axle used ATF (automatic
transmission fluid) which is very thin while the back axle used 80/90 lube.
Other than the front axle having bevel gears and the rear axle having
hypoid gears the seals and sealant were specified the same and the axles
were manufactured the same. The same seal specifications was used for the
transfer case too, which also used ATF.

Dave Reuter


----- Forwarded by Dave Reuter/IAVINC/IAV on 06/20/2003 12:29 PM -----
                                                                           
                                                    
                      "Hazen, Dwight L"                                    
                                                    
                      <hazen indiana edu>                To:       
<elec-trak cosmos phy tufts edu>                            
                      Sent by:                           cc:               
                                                    
                      elec-trak-bounces cosmos ph        Subject:  RE: 
(ET) rear end oil change                                
                      y.tufts.edu                                          
                                                    
                                                                           
                                                    
                                                                           
                                                    
                      06/20/2003 11:52 AM                                  
                                                    
                                                                           
                                                    
                                                                           
                                                    





For cold weather Mobile synthetic transmission oil is a must! It should
be 80 or 90 weight. Using 10/40 engine oil you might have a problem with
the thin oil leaking out of the case and seals. For sub zero use 10/40
might be ok. I noticed a big difference in performance with temps in the
low 40's using the synthetic oil.

Any new oil is better than old/low oil!

 Dwight

Dwight L. Hazen, Indiana University, UITS
Bloomington, In. 47408-7378
812-855-5367 IP phone 317-278-4014
hazen indiana edu http://php.ucs.indiana.edu/~hazen/
Ham Radio wb9tlh arrl net http://wb9tlh.ampr.us


-----Original Message-----
From: Elie, Larry (L.D.) [mailto:lelie ford com]
Sent: Friday, June 20, 2003 10:19 AM
To: 'Gregory Wilcox'; D Howell; elec-trak cosmos phy tufts edu
Subject: RE: (ET) rear end oil change

Mobil makes a transmission version of their synthetic oil.  It is
'lighter' (lower viscosity) than most
transmission oils, but does NOT 'break down' into the component parts
like a blend, so the viscosity
does not rise significantly over time.

Mr. Landis can answer for himself, but his controller uses set point to
determine whether to charge or not.
As battery temperature changes, and as the cells equalize, the voltage
will change and the set point will
be passed.  The charger will indeed cycle a number of times.

Larry Elie




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