Cant engage gear with engine running

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Chadstone Pat

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northampton
Hi all, I have searched the various forums but can't find anything that quite fits the bill. My 90/defender stopped going into gear with the engine running, no probs when engine stopped or when diff lock is in neutral. What I cannot understand is when I stop the engine then select a gear then start the engine with my foot on the clutch there is no drag and the clutch can be released normally. The engine is obviously still turning the gearbox but not enough to cause any drag when in gear.
I have bled it up and down and changed the master cylinder, before I get a slave cylinder does anyone have any thoughts ? Patrick
 
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Are you are sure the clutch is releasing properly as it sounds like the input shaft is still rotating? If so it could be down to worn baulk rings in the gearbox. They are a friction component and their job is to match the speeds of various gear / shafts within box to allow a gear to be selected. If they are worn then they can cause difficulty in selecting gears. Also check the gearbox oil level (or even replace it) as baulk rings rely on oil to work properly
 
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Are you are sure the clutch is releasing properly as it sounds like the input shaft is still rotating? If so it could be down to work baulk rings in the gearbox. They are a friction component and their job is to match the speeds of various gear / shafts within box to allow a gear to be selected. If they are worn then they can cause difficulty in selecting gears. Also check the gearbox oil level (or even replace it) as baulk rings rely on oil to work properly

Thanks for your thoughts, the oil level is good, the box was refurbished about 10k ago so I would have thought it should be ok, is there a separate baulk ring for each gear ? as no gears are selectable with engine running.
 
Give us a clue re your gearbox, is it an LT77, an LT85, an LT230, or what?.
Have you had it filled with EP80, EP90 or the ATF or MTF stuff?
 
My experience with the R380 gearbox is that if there's any rotation at all getting through the clutch it won't select gears, even though there is not enough torque to move the vehicle. If you adjust the mechanism where the pedal is linked to the master cylinder so that the bite point is a bit higher, does that make a difference? Another thing that happens is that the clutch master and slave cylinder seals deteriorate so it doesn't separate the plates sufficiently. This is usually solved with new master and slave cylinders.
 
''...If you adjust the mechanism where the pedal is linked to the master cylinder so that the bite point is a bit higher...''
I had a similar problem with my Lightweight, changed both cylinders, bled the system - no better, adjusted the pedal as per the Workshop Manual (140mm from the base of the pedal to the floor for a Defender - no mats) and it worked a treat (and still does)
 
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''...If you adjust the mechanism where the pedal is linked to the master cylinder so that the bite point is a bit higher...''
I had a similar problem with my Lightweight, changed both cylinders, bled the system - no better, adjusted the pedal as per the Workshop Manual (140mm from the base of the pedal to the floor for a Defender - no mats) and it worked a treat (and still does)


Try all lengths, finished with it wracked right out to the end to get a bit more throw.
 
lt77 should have dexron 2 or 3 not gear oil,the coated baulk rings will be destroyed,reverse is a sliding gear so not affected by wrong oil,its either the oil in the box or clutch not clearing,which can be hydraulic side or clutch cover itself

Cant get reverse either, Hmn... I'd be supprised if all the rings went at the same time, slave cylinder may make a difference will know shortly. Thanks for your reply
 
Cant get reverse either, Hmn... I'd be supprised if all the rings went at the same time, slave cylinder may make a difference will know shortly. Thanks for your reply
they can as ive seen,rebuilt boxes with destroyed baulk rings after few miles,but reverse affected on an lt77 says clutch isnt clearing
 
Hi all, I have searched the various forums but can't find anything that quite fits the bill. My 90/defender stopped going into gear with the engine running, no probs when engine stopped or when diff lock is in neutral. What I cannot understand is when I stop the engine then select a gear then start the engine with my foot on the clutch there is no drag and the clutch can be released normally. The engine is obviously still turning the gearbox but not enough to cause any drag when in gear.
I have bled it up and down and changed the master cylinder, before I get a slave cylinder does anyone have any thoughts ? Patrick
Another thought, could be the spigot bush in the flywheel has partially seized to the input shaft, that would cause the input shaft to spin with the clutch disengaged, was it changed when the box new box / clutch was fitted?
 
Another thought, could be the spigot bush in the flywheel has partially seized to the input shaft, that would cause the input shaft to spin with the clutch disengaged, was it changed when the box new box / clutch was fitted?
I had thought about that. It was changed, and there was none of the usual noise associated with bush failure.
 
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