[QUOTE=H96669;20248064]I just had a driveshaft rebuilt by Bruno in Canada.Not a GS this time, but still a BMW with the very same U-joints.And that one spins much faster....
I think his recommendation is lube at each tire change. It now has over 10,000 kms and is on my bench. I may just remove one of them U-joints and see for myself how much grease is left. I bet there is plenty and then I'll make up my own mind as to the lube intervals.
His recommendations for lube is Synthetic grease, so I just went to the marine shop and bought Amsoil synthetic water resistant. If I have a chance I'll dig up my pics, may interest some as to what I found for cause of failure on some of them U-joints. Looks like moisture may just seep in between the yoke and U-joint caps, create corrosion which in turn tightens up the caps over the needles/cross....creates more friction/heat, grease runs out and then the joint fails. I sure found corrosion between the caps/yoke and wear marks inside the caps that almost exactly match with the outside corrosion. Or.....I could also show my parts to Mr. Jackd, may have some time and will be on the big island toward the end of January /QUOTE]
I'll send you my personal contact info, H96669 - for when you are over in my neck of the woods. I'm generally over here if not working in Vancouver and a visit with you is bound to be entertaining - in January or some later date.
Your synthetic grease recommendation is something that I will look into - I don't know much about them. Aviation grease is where my expertise is, seeing as I have seen many issues caused by moisture contamination and frigid temperatures that render systems inoperable over the years. I am also aware that grease will take the path of least resistance when being pumped in, but seeing as my new driveshaft is quite new, there shouldn't be any blockages caused by older congealed grease that might prevent even distribution.
When I was in the market for a driveshaft re-build, I was looking for a quick turn time and a re-builder that would replace the vibration damper material due to a pre-set that all OEM shafts seem to exhibit in service. HPM was starting to get some returns on his work and Bruno doesn't change it out. The Emerald shaft got into my hands a day before our last major labour dispute at Canada Post started..... I'll report my findings here when I finally get into my swing arm repair - and that will also include the state of my bearings.