I just about lost my religion yesterday trying to reassemble the A-type
OD to my TR4 gearbox, so thought I'd post some lessons learned;
hopefully they'll benefit someone else.
Ensuring that the splines align perfectly so the mainshaft will slide in
easily is fiddly. Lightly lever the two bridge bars forward and spin
the drive flange until the splines align perfectly. Tap the bridge
pieces rearward and align the splines perfectly with the pump axis, then
align the mainshaft splines vertically (so the splines will mesh).
Ensure that the pump cam lobe is at the 12 o'clock position. Don't
touch the drive flange.
Tie the pump roller in the full down position. I looped bare 28AWG wire
behind the roller, then wrapped it tightly to one of the solenoid side
cover studs.
For the moment, use flat washers instead of lock washers on the long
studs. Lightly grease the mainshaft splines, slide the OD onto the
mainshaft and tighten the nuts until there is about a 1" gap between the
units. Use a screwdriver to lever one of the springs to the rear, which
will lock the sun gear so the splines rotate together. You can then
rotate the drive flange to mesh the splines on the mainshaft. Be sure
that all springs are properly seated on the adapter plate. Continue
tightening the nuts. If you encounter significant resistance with a gap
of about 0.44 - 0.47, the OD splines aren't properly aligned, so de-mate
the units and start over. Once you're past the 0.44 (+/-) gap, continue
tightening. At a gap of about 1/4" the pump should be under the cam.
If you're as A.R. as I am, remove the pump filter and the 5/8" bolt to
gain access to the pump. Release the pump roller and rotate the drive
flange a full revolution. The pump should move. If not, de-mate the
unit, check to ensure that the pump isn't bent and moves easily, and
start over.
When properly assembled the drive flange should easily turn the
mainshaft (gearbox in neutral).
It wouldn't hurt to pack some grease under the pump to prime it.
Hopefully these tips will help someone.
Jim
--
J.C. Hassall
Blacksburg VA
64 TR4 in autox preparation
95% finished, 90% to go
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