Hi Ken et. al.,
Welding main shaft nut(s) on 5 speed tranny: don't do it! First, you
need to have your welded 5th gear ground down, preferably on a surface
grinder, but hand work it if you must (you suggested filing below). The
overall gear width must be slightly less than the length of the sleeve
it rides on (say .003-.004") so that the main nut pushes the big thrust
washer against the sleeve, not the gear. The gear is then free to rotate
on the needle bearing on the sleeve, between the two thrust surfaces,
with a slight amount of end play.
Here's what I do with the nuts; YMMV. I tighten the big nut against a
normal lock tab washer as tight as I can get it (put the tranny in 2
gears simultaneously to lock it up). Then I take a second lock tab
washer and break the two tangs off it. I put this second washer and the
second nut on, in that order, and tighten the second nut as tight as I
can. Bend the first washer against the main nut, and bend the second
washer against both nuts alternately.
Good luck,
Dick Tillinger
Date: Mon, 5 Apr 2010 11:37:51 -0700
From: The Ken Pearce <ken__pearce@hotmail.com>
Subject: [Roadsters] 5th gear neutral , welding main shaft nut on 5spd
tranny?
To: <datsun-roadsters@autox.team.net>
Ahoy Roadster fans and transmission experts,
Long time no see, but it's finally time to get my 68-2000 back on the
road in time for Shasta 2010! (Is it still the weekend after 4th of
July?)
I'm going back together with my 5spd transmission after suffering the
5th gear neutral problem and I'm looking for some pointers from
transmission experts and those that have done it before.
I had the 5th gear welded at a machine shop and they did a competent
job. The weld bead is just *slightly* higher than the surface of the
gear, I've considered filing this down but don't want to diminish the
strength of the weld. We're talking 1/32 or at most 1/16 of an inch
higher.
My question:
When the manual calls for 250-ft-lbs or torque for the main shaft nut,
are they talking about the larger nut which goes against the
ball-locked-spacer, or are they talking about the locknut (I think they
call it "locking plate")?
If I tighten the thicker nut too much (even just hand tight), the 5th
gear has trouble rolling on it's roller bearings. The manual says "do
not tighten" in regards to the larger nut, so is this a matter of
adjusting it against the spacer so that 5th gear can still move on it's
roller bearings and then using 250-ft-lbs on the locknut?
And should I spot weld those two nuts to one another? Anyone ever tried
to take welded nuts apart later??? Hacksaw?
Parts vendors be on alert, I'll be looking for timing chains, valves,
cam tower shims, head gasket, intake-exhaust gasket, 5spd tranny seals,
and I'm sure a lot more in the coming 2 weeks.
Thanks,
Ken Pearce
Bellingham, WA
68-2000
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