I’m coming at this from a Saloon perspective, so my recommended sites
may not be spot-on…but a month ago or so we had quite a discussion
over on Saloons about overdrives.
There is a strong contingent that says test your unit with a special
pressure gauge…and you’ll be able to diagnose it yourself.
In any event, my Mark 2 shifts into overdrive just fine for the first
20 miles or so, then needs careful throttle feathering to coax it in up
to about 40 or 50 miles…then, if I were to keep driving (in Juneau,
I’m home by that time!), I suppose to would continue to get worse.
Anyway, I’ve come to the conclusion that I need to have a few O-rings
renewed in my overdrive (leakage past the hardened O-ring (s) make it
impossible for the unit to maintain pressure). I have identified the
man I will send my unit to when the time comes, again thanks to the
Saloon list. His name is Duane Hoberg, in Kansas City, MO.
OK, here’s some overdrive reading for you:
I have copies of a series of emails to and from Hoberg back in 2002
(from a Saloon Lister in BC) that convinced me.
1954 XK 120SE OTS S674946
1962 3.8 Mark 2 MOD, chrome wires
1970 XJ6 1L55441BW
Juneau, AlaskaOn Nov 17, 2004, at 1:46 PM, Rob Hod wrote:
For a while now my overdrive has been inop. When I turn the switch
on I get the familiar solenoid click, but no drop in revs.
If I lift off then the revs drop, but rise back up to the direct
4th speed as soon as I reapply some throttle.
Rob Hod '73 Daimler Sovereign MOD
The archives and FAQ will answer many queries on the XJ series…
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