Patrol Rear Diff Problems - Page 2

solarman216 · 11-01-2020, 19:57

Remove spider pins and gears

solarman216 · 11-01-2020, 19:58

Not what I expected, it is all as good as gold, need a rethink on this one

solarman216 · 11-01-2020, 20:01

Putting it back together, have come to the conclusion it is a malfunction of the vac operated diff lock, will investigate that tomorrow

solarman216 · 12-01-2020, 23:07

Sorry no pics but all back together and at the mo can only say the on lock vac is stronger than the off lock vac so poss a leaky pipe, it still does not fully explain why it only ever pulled to the right, never once to the left, maybe something to do with the lock not fully engaging but just ratcheting, which is the noise I heard, more investigation yet to come, not heard a peep from other Patrol owners so assume not a common problem, anyway real glad I have the experience of stripping it as I now know what a solid bit of kit this rear diff is, Rick

Barrbeast · 13-01-2020, 20:17

Yeh sorry Rick, my Y60 has a LSD and the only time I had an issue with the difflock in my Y61 was when I stripped a tooth off the dog clutch from over use when I unknowingly had a knackered hub (found the tooth fragments stuck to the sump magnet and when I tested the lock it just gave a clicking sound but didn't engage).

I never tried to fix it, just fitted a Lokka in the front.

makeitfit · 13-01-2020, 21:16

Never had that issue with mine but have heard that the diff lock actuator is a bit suspect.
No idea why it would shoot off to one side other than local road conditions like camber or wetness ?

solarman216 · 13-01-2020, 21:47

After a bit of rooting around discovered that it is routed through the Glow plug controller, as I do not have an ECU on mine the Glow plug unit handles the plug timings and related parameters like coolant temperature, current battery voltage, how long it has it has been running over a certain revs, etc it also handles the tachometer, and now discovered the diff lock in as much as it will not allow diff lock above a certain speed, now this little box of tricks sits down by the throttle pedal and has been wet a couple of times, certainly the Tacho plays up regularly, for the moment I have disconnected the "lock" vac pipe leaving the "unlock" pipe attached, if this cures the problem then a mod will be required to simply connect the switch direct to the two vac control valves so by passing the "control unit" which I feel is playing about, glow plugs will go the same way via a simple timing unit to keep them on for a few mins after starting, Rick

makeitfit · 13-01-2020, 22:47

Have you got a pic of that unit please Ric

solarman216 · 13-01-2020, 23:52

No but get one tomorrow, Rick

solarman216 · 14-01-2020, 09:58

Location of unit

solarman216 · 14-01-2020, 09:59

Detail plate. Rick

macabethiel · 14-01-2020, 11:16

Quote:

Originally Posted by solarman216

Sorry no pics but all back together and at the mo can only say the on lock vac is stronger than the off lock vac so poss a leaky pipe, it still does not fully explain why it only ever pulled to the right, never once to the left, maybe something to do with the lock not fully engaging but just ratcheting, which is the noise I heard, more investigation yet to come, not heard a peep from other Patrol owners so assume not a common problem, anyway real glad I have the experience of stripping it as I now know what a solid bit of kit this rear diff is, Rick

I would be well hacked off after all that work for it not to be the diff.
Were there any issues such as diff bearing preload on the rebuild or is it okay?
I guess its far more likely to be a loss of vacuum on old pipework or even the control unit.

I assume you have ruled out a sticking handbrake cable or brake caliper / drum.

Reminded me of when I took the gearbox out of my brothers Austin 1100 -twice -for jumping out of gear. Turned our to be lower subframe mountings had ripped out part of the front floor!!

solarman216 · 14-01-2020, 22:39

No problem with bearing pre-load, one cap I did not disturb the other just wound it up to the marks I made, however the pinion was another matter upon looking at the inner bearing when turning the pinion the rollers were not rotating, so stripped that out to check it over, conclusion was that there was insufficient pre-load, the adjustment here is with shims, one 5 mm the other 2.2 mm so took 0.2 mm off the thicker one, assembles it up without the oil seal and now got the prescribed loading, pulled it apart and re fitted the oil seal so bob's your uncle all hunky dorry, as an add, removing the lock vac hose did not cure it, as the control system is clearly the culprit whilst not being able to lock the diff it was removing the unlock vac so the vac chamber is free to move which it did to the tune of nasty ratcheting sounds, cured it now though, put permanent vac on the unlock chamber, Rick

makeitfit · 15-01-2020, 15:51

Quote:

Originally Posted by solarman216

Detail plate. Rick

Thanks Rick, I'll go and get mine out for a check over.

12-01-2020, 23:07	#19
solarman216 Off road maniac Join Date: Dec 2009 Location: Bexhill on Sea Vehicle: Y60 Patrol Me, 3 ltr Mrs Posts: 17,319	Sorry no pics but all back together and at the mo can only say the on lock vac is stronger than the off lock vac so poss a leaky pipe, it still does not fully explain why it only ever pulled to the right, never once to the left, maybe something to do with the lock not fully engaging but just ratcheting, which is the noise I heard, more investigation yet to come, not heard a peep from other Patrol owners so assume not a common problem, anyway real glad I have the experience of stripping it as I now know what a solid bit of kit this rear diff is, Rick __________________ Ex banger racer now off road maniac Lokka on the front with manual hubs Diff lock on rear 3 inch SS straight through exhaust Manly winch bumper with 13000 lb winch 10 spike ground anchor, with multiple straps and blocks Super strong body cills capped with scaffold pole 20% stronger springs all round aggressive off road tyres on wheels so just swap. Aim to get stuck and be completely self sufficient in extraction, love getting muddy, 2ft deep is good but rare.

13-01-2020, 21:47	#22
solarman216 Off road maniac Join Date: Dec 2009 Location: Bexhill on Sea Vehicle: Y60 Patrol Me, 3 ltr Mrs Posts: 17,319	After a bit of rooting around discovered that it is routed through the Glow plug controller, as I do not have an ECU on mine the Glow plug unit handles the plug timings and related parameters like coolant temperature, current battery voltage, how long it has it has been running over a certain revs, etc it also handles the tachometer, and now discovered the diff lock in as much as it will not allow diff lock above a certain speed, now this little box of tricks sits down by the throttle pedal and has been wet a couple of times, certainly the Tacho plays up regularly, for the moment I have disconnected the "lock" vac pipe leaving the "unlock" pipe attached, if this cures the problem then a mod will be required to simply connect the switch direct to the two vac control valves so by passing the "control unit" which I feel is playing about, glow plugs will go the same way via a simple timing unit to keep them on for a few mins after starting, Rick __________________ Ex banger racer now off road maniac Lokka on the front with manual hubs Diff lock on rear 3 inch SS straight through exhaust Manly winch bumper with 13000 lb winch 10 spike ground anchor, with multiple straps and blocks Super strong body cills capped with scaffold pole 20% stronger springs all round aggressive off road tyres on wheels so just swap. Aim to get stuck and be completely self sufficient in extraction, love getting muddy, 2ft deep is good but rare.

13-01-2020, 23:52	#24
solarman216 Off road maniac Join Date: Dec 2009 Location: Bexhill on Sea Vehicle: Y60 Patrol Me, 3 ltr Mrs Posts: 17,319	No but get one tomorrow, Rick __________________ Ex banger racer now off road maniac Lokka on the front with manual hubs Diff lock on rear 3 inch SS straight through exhaust Manly winch bumper with 13000 lb winch 10 spike ground anchor, with multiple straps and blocks Super strong body cills capped with scaffold pole 20% stronger springs all round aggressive off road tyres on wheels so just swap. Aim to get stuck and be completely self sufficient in extraction, love getting muddy, 2ft deep is good but rare.

14-01-2020, 22:39	#28
solarman216 Off road maniac Join Date: Dec 2009 Location: Bexhill on Sea Vehicle: Y60 Patrol Me, 3 ltr Mrs Posts: 17,319	No problem with bearing pre-load, one cap I did not disturb the other just wound it up to the marks I made, however the pinion was another matter upon looking at the inner bearing when turning the pinion the rollers were not rotating, so stripped that out to check it over, conclusion was that there was insufficient pre-load, the adjustment here is with shims, one 5 mm the other 2.2 mm so took 0.2 mm off the thicker one, assembles it up without the oil seal and now got the prescribed loading, pulled it apart and re fitted the oil seal so bob's your uncle all hunky dorry, as an add, removing the lock vac hose did not cure it, as the control system is clearly the culprit whilst not being able to lock the diff it was removing the unlock vac so the vac chamber is free to move which it did to the tune of nasty ratcheting sounds, cured it now though, put permanent vac on the unlock chamber, Rick __________________ Ex banger racer now off road maniac Lokka on the front with manual hubs Diff lock on rear 3 inch SS straight through exhaust Manly winch bumper with 13000 lb winch 10 spike ground anchor, with multiple straps and blocks Super strong body cills capped with scaffold pole 20% stronger springs all round aggressive off road tyres on wheels so just swap. Aim to get stuck and be completely self sufficient in extraction, love getting muddy, 2ft deep is good but rare.

13-01-2020, 20:17	#20
Barrbeast Senior Member Join Date: Mar 2013 Location: Dundee, Scotland Vehicle: 1990 4.2 SWB Safari Posts: 2,615	Yeh sorry Rick, my Y60 has a LSD and the only time I had an issue with the difflock in my Y61 was when I stripped a tooth off the dog clutch from over use when I unknowingly had a knackered hub (found the tooth fragments stuck to the sump magnet and when I tested the lock it just gave a clicking sound but didn't engage). I never tried to fix it, just fitted a Lokka in the front.

13-01-2020, 21:16	#21
makeitfit Senior Member Join Date: Apr 2008 Location: on the beach WEST WALES Vehicle: Maverick TDi BLACK mmm Posts: 15,136	Never had that issue with mine but have heard that the diff lock actuator is a bit suspect. No idea why it would shoot off to one side other than local road conditions like camber or wetness ?

13-01-2020, 22:47	#23
makeitfit Senior Member Join Date: Apr 2008 Location: on the beach WEST WALES Vehicle: Maverick TDi BLACK mmm Posts: 15,136	Have you got a pic of that unit please Ric