Subject: Proper Oil for O/D
| I just installed an O/D in a TR3 that was purchased from a guy that
rebuilds
| them as a business. His advice is to use 40 WT non-detergent oil in all
TR
| overdrives. His contention is that the plastic gears in the O/D cannot
push
| around the heavier (80/90) oil forever without breaking. Non-detergent is
| recommended to keep the oil from foaming.
This subject is discussed on the Triumph & 6 PACK lists every few months.
However, this is a new twist. I've had quite a few of these apart and
didn't
find any plastic gears except for the speedometer drive gears -- and they
are not in a position to shove the oil around. However, if someone is using
plastic drive gears, it's not surprising that they fail.
Some of those earlier threads listed viscosity data. As I recall , 40W
engine oil and 80/90W gear oil have about the same viscosity. Apparently
different scales are used for engine oil and gear oil.
Triumph specified 80/90W gear oil for both A & J OD gearboxes and well as
non OD gearboxes on TR6s. Some have said this was an error. Clearly,
Laycock recommended engine oil in the 50s and 60s. I haven't seen any more
recent Laycock data. Has anyone seen a Triumph Service Bulletin correcting
this error for the TR6?
Does anyone have know what Healey recommended for their later A OD
applications. How about the late '70s and early '80s Volvos that used the J
OD?
Nelson Riedel
Granville Ohio
'68TR250, '70TR6, '76TR6
|