Crawl under and start from the 3-balled vacuum reservoir. With
engine running pull off the line and listen for the tank to hiss
If it doesn't the check valve is right there by the tank, pull it off,
blast it clean with spray lube like WD-40. The Valve is all
and will revive if dirty, which often happens. Once done try the tank
luck, trace back to engine and find the leak, likely a bit of rubber
The tank filling point is a steel tube, they may rust shut, have a go
that. Once satisfied that the tank is getting air, (3) go to the
dash and pull the black pipe off the switch and listen for hiss.
If nothing, then that line is broken.
reconnect and pull off the blue or white pipe and play with the switch
to get vacuum at each line. Valve body is plastic and may have cracked,
epoxy/replace if needed.
is to crawl under now and pull line off the servo by the trans
listen for hiss at each line, if good, continue, if not broken pipe(s)
two nuts from servo bracket to allow the servo box to float free.
it STRAIGHT! get some one to work the dash valve. Box should move
in/out when active. If not dead servo, replace (can be split open
to check diaphragm, maybe goop-able)
is good, but diff lock wouldn't move then remove the servo and its
You need to drive out a 3mm drift pin from the actuator shaft first
bend the servo rod!!!!! Slip a small nail into the 1/2" diam actuator
on the diff and go to it, penetrating oil, bristle brush/emery cloth
and get it moving again.. This is the most likely failure point, gummed
up from lack of use, so you may wish to start here BTW.
the shaft is free about 1/6th of a turn of a tire will let the lock
about 1" travel inwards of the shaft. If it is really freed up properly
the tiny return spring inside the diff will push the lock out to 'off'
by itself. Very light force to move shaft is all. At same time, see if
the dash light came on when shaft pushed in, if not unplug the
and bridge the terminals. After that check it as needed, maybe a
dead LED. There is an O-ring around an aluminium sleeve (that is
around the shaft). Sleeve will move out when you tug to expose
replace that via dealer part, cheap.
the lock aboutr once a week regardless of need, it likes to be
HTH, bye, Tim