85w140 in rebuilt g/box HJ61
Submitted: Tuesday, Jul 26, 2005 at 12:18
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figtree
Hi there,
we just had the gearbox/transfer case on our HJ61 rebuilt in
Kimberley. When we got
home, I realized the mechanic filled them with 85w140 grade oil (presumably BP). We drove 5000km
home to
Wollongong, mainly in 5th gear. The gears now feel fine when they warm up, but when cold the 1st and 2nd are very, very stiff. I wonder if this wold be due to the high viscosity oil? Does this grade of oil give additional protection to the gears when they are still wearing in? In other words, should I change the oil to a lower grade, considering it is much colder here than in
Kimberley, or should I keep it until the gears are worn in and just warm the oil up before driving off by running the engine in first gear with the transmission lever in neutral?
Joseph
Reply By: Member - DOZER- Tuesday, Jul 26, 2005 at 13:35
Tuesday, Jul 26, 2005 at 13:35
Gday
Change your oil back to something that will work around here. (im in Farmborough heights) remembering it was in 30 degree temps that the 85/140 was used.... id leave whats in the transfer, and change just the gearbox oil. Suggest you get some Castrol vmx-m oil (75/80 or something like that) only because most of the people on www.lcool.org site use this after trying most of the rest.
The 85/140 means it acts as an 85 grade when cold and like a 140 grade when hot....or it stays thick like honey even when hot....this wont wear things out faster or anything like that, but will make things hard to change and possibly less likely to leak past seals etc (the 60's have a common problem with transfer oil being leaked into the gearbox) so for these reasons plus the temp up there, he has used this oil.
Andrew
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122115