hello all, I'm new to the forum. I've made a terrible mistake when my uncle (who has just purchased a '79 r65) quickly asked me where the oil drain plug was. what we agreed on was actually the tranny drain plug. so my question is:
with the tranny drained of oil
1: what's the proper viscosity and capacity?
2: is there a proper fill plug on the tranny?
any help appreciated
+1 on what Rob said>
Quantities:
Tranny - 800cc
Drive shaft - 100cc ( the book says 150cc but Oak says it will run on a little as 50cc and be OK)**
Final drive - 250cc
Torque settings: (page 105 Clymer Manual) Get a 3/8 inch drive Craftsman Torque wrench. Get copper washers from you favorite supplier or the stock BMW washers and use use fresh new every time (or every other time).
Tranny Fill - 28-31 n-m
Tranny Drain - 23-26 n-m
Drive shaft Fill - 14 n-m
Drive Shaft Drain - 14-16 n-m
Final Drive Fill - 28-31 n-m
Final Drive Drain - 23-26 n-m
Engine Oil Drain - 30-35 n-m
Oil type- (AH HA an ADOT***) I use Valvolene Semi-Synthetic blue bottle 80W90 October thru April here in Atlanta
I use the 85W145 May thru September (summer months). There are two reasons I do this. 1) if there is a water problem {water getting into the oil} I catch it quick. And 2) the 85W145 is too thick for the winter months. The water usually gets into the Drive shaft through the Speedo cable bell (rubber bell around cable on RH side of the tranny.) If this rubber boot is anything less than PERFECT (any cracks at all) replace it now! Either Tye wrap the top of the bell around the cable tightly or use some Radio Shack Shrink wrap tubing to seal the top to keep water from getting into the Drive shaft oil and tranny. I have used both methods to good effect. The part number is not on the R65 Fiche. If you need it just post here and we will provide it for you.
My tranny has lasted 90900 miles without a re-build so far using this method. When the final drive was re-built because the splines to the rear wheel were worn out, the gears inside were not replaced. I got only a new spline and new seals.
**Why would I use less than the published oil quantity for the drive shaft oil. Good you asked. There is a small hole between the drive shaft and the tranny. At High speeds (65mph plus) oil from the final drive will migrate from the drive shaft into the tranny. This will overfill the tranny. So I use less (100cc) and this doesn't happen. The Oak guy is one of the gurus (whose feet I am not fit to wash) at
www.airheads.org. I pay close attention to anything Oak has to say. I merely repeat for your benefit.
***Another Damn Oil Thread. So many opinions so little time....
