In reply to a message from rich schofield sent Fri 29 Jan 2016:
Hi Rich,
I have no personal experience with this set-up. I see the
manual suggests ‘‘strip valve bodies and clean’’ for your
symptoms, but I would be inclined to first check that the
throttle modulation sensing (kick down cable) is working
properly in case you get an easy fix there, although it
looks like this still involves dropping the pan…
Adjusting the kick-down cable would principally affect all shifting points,
Simon - and the shift quality…
But your point is well taken - picking apart the valve body is no walk in
the park - it’s intricate, even if you know what you are looking for. In
principle, the cable should be adjusted using pressure point take-off - a
standard procedure, and any auto box shop can easily do it. The adjustment
tunes the valve body pressures to the output pressure delivered by the
engine driven pump - actually, the box works by differential pressures
rather than absolute pressures…
He should first check if the ferrule crimped on to the shift cable is
present - and adjust the cable to a clearance of 0.01" from the threaded
adjuster. The ferrule is crimped on at the adjustment - and cable stretching
may alter the adjustment, and adjusting the cable length should bring the
setting back to the original pressures…
His description of the problem is somewhat rudimentary, but the box reacts
to gas pedal position for shifting. The more pedal the later the shifting -
when testing the shift points; constant light throttle is called for, any
more pedal input during the shifting will delay upshifts…
Apart from the pedal position, the box also use engine rpms and the input
from the governor (road speed) to select shifting. A governor fault may
influence shift points, but nominally equally for 1/2 and 2/3, of course…
Frank
xj6 85 Sov Europe (UK/NZ)
The original message included these comments:-----Original Message-----
From: Colonial 1
Sent: Saturday, January 30, 2016 1:44 PM
To: xj@jag-lovers.org
Subject: Re: [xj] Borg Warner type 66 2nd to 3rd shift problem, Series 3 xj6
I’ve got a series 3 4.2 with a 3 spd auto.
The gearbox mostly works as it should apart from a problem
on changing from 2nd to 3rd. It holds 2nd gear well past
the stated shift point.
===================================================
The archives and FAQ will answer many queries on the XJ series…
FAQs: http://www.jag-lovers.org/xjlovers/xjfaq/index.html
Archives: Jag-lovers Forums - Jag-lovers
To remove yourself from this list, go to Jag-lovers Forums - Jag-lovers.
// please trim quoted text to context only