Hi Brian
The laygear needle bearings (Torringtons) on the TR4 were notorious for
moving on their own, out into the thrust washers. Doubt this is the work of
any machine shop. I've seen these go almost thru the washers, making
disassembly well nigh impossible. I suspect the color in the oil is bits of
ex-thrust washer & ex needle cage.
On TR6 (TR250?) models, these bearings were restrained by a circlip, in a
groove in the laygear. However, a TR6 laygear won't fit a TR4 without other
items changing also, don't recall exactly what.
I have been told that a very carefully placed weld spot on the inside of the
TR4 laygear will work to prevent the above mentioned movement. Never tried
this myself, way too chicken!
Ken Nuelle
58 TR3A
62 TR3B
64 TR4
69 TR6
In a message dated 2/5/01 10:21:22 AM Eastern Standard Time,
sanborn@net1plus.com writes:
<< I took apart my rebuilt gearbox with 4000 miles on it yesterday in order
to
swap the mainshaft and install the OD I rebuilt. The only thing strange was
the Redline synthetic oil was black and dirty already and there was a lot
dark
gray something in suspension... very fine... or maybe just dirt. The other
thing was that the laygear would not drop and the back thrust washer would
not
come out. Really stubborn problem. I had to heat the case with a propane
torch to get enough clearance to get the thrust washer out. What I found
was
that the roller bearing cage was protruding a little proud of the gear
itself
on both ends. The machine shop must have done this and I didn't notice.
The
ring of the bearing cage cut a groove in the thrust washer on both ends.
Although... that still doesn't explain why the laygear would not drop even
with a tap with a drift. The clearances were on spec when I installed the
laygear.
Should the oil be dirty after 4000 miles and two seasons? The gearbox was
hospital clean when assembled. Any insight would be helpful.
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