ird unit or auto box help needed asap please

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bandit600

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hello
i had the wheels locking up on a auto td4, removed prop still locking up, id driven really slow below 5 mph doesnt lock up, so today i jacked it up at front put it in drive and was still clunking so i removed the ird oil, this was clean so i have now removed the input shaft that the prop bolts to had a look no damage to that no bits of metal the cogs inside all look ok,

started the car with this still removed and front wheels off the ground and still clunks in drive, does this mean its the auto box????

cheers
 
Freelaner said:
ird oil clean? totally, check for really fine metallic bits in it.
Click to expand...

just filtered the oil and its spotless, only just had car and was purchased with this fault as thought it was ird.

oil could of been changed recently i suppose but was bit of oil gunk on drain plug but no metal bits.

no signs of metal bits off any of the 3 cogs/splines i can see

cheers
 
Last edited:
update


now i have front wheels off ground no prop fitted and prop input shaft removed from ird unit.

stated car placed in D and wheels started moving as you would expect, ranging from 3 to 3.5 turns of the front wheels they just stop then start moving again for another 3/3.5 turns then it stops again, if i increase speed it does the same but with more of a jilt when it stops.

place it i gear 1 it turns then stops at 3/3.5 turns then wont move.

i've been under it while it was turning and can see the gears in the ird spinning then stop then start again but can not see and damage issues with the gears in there.

hope this info gives someone a better idea of the issue

cheers
 
From what you've described I'd be leaning towards it being the Jatco box at fault here although I've no idea what failure can produce your problem...

Have you dropped the gearbox oil? What colour is it and does it smell burnt?

When it skips drive do you get any noises and if so can you isolate where they are coming from?

Edit, if it skips regular as clockwork at 3 - 3.5 turns surely that must be a mechanical fault, like a stripped gear? If it was the gearbox, which is essentially a hydraulic pump (sort of), then it would be an irregular fault? But if it was a gear in the IRD the oil would contain shrapnel....hmmmm
 
Last edited:
stewart09 said:
From what you've described I'd be leaning towards it being the Jatco box at fault here although I've no idea what failure can produce your problem...

Have you dropped the gearbox oil? What colour is it and does it smell burnt?

When it skips drive do you get any noises and if so can you isolate where they are coming from?
Click to expand...

hi

no haven't drained the auto oil yet was waiting to see if that was mentioned as possible fault, no noise at all it just stops whole drive train jolts then rolls again

cheers
 
do NOT undo the wrong plug or you will have to have the gearbox off as if you undo the wrong one the selector will drop down somebody has change the fluid on here and there is a link on what to do and not what to do but it does sound as though you have a problem with the gearbox
hope this helps
 
teddywood1 said:
do NOT undo the wrong plug or you will have to have the gearbox off as if you undo the wrong one the selector will drop down somebody has change the fluid on here and there is a link on what to do and not what to do but it does sound as though you have a problem with the gearbox
hope this helps
Click to expand...

hi just been reading up on it and the problem i see is how do i get it to temp when it cant drive lol what ever happened to the simple cars of of days gone by


cheers
 
If you are just checking the oil , then undo the drain plug and drain the oil out . You can measure the same quantity back in, so no temp setting needed at this point . If the oil is pinky then you are ok on that front .
JMHO but dont think this is a auto box fault as your getting a regular 3/3.5 turns more likely its in the main diff / ird . Have experienced similar with diffs
 
tacr2man said:
If you are just checking the oil , then undo the drain plug and drain the oil out . You can measure the same quantity back in, so no temp setting needed at this point . If the oil is pinky then you are ok on that front .
JMHO but dont think this is a auto box fault as your getting a regular 3/3.5 turns more likely its in the main diff / ird . Have experienced similar with diffs
Click to expand...

hi
thats what i was thinking but wouldnt the gears in the diff show some signs i have rotated the diff gears and the ones that connect to the prop input shaft are all perfect, the oils was spotless

cheers
 
stewart09 said:
From what you've described I'd be leaning towards it being the Jatco box at fault here although I've no idea what failure can produce your problem...

Have you dropped the gearbox oil? What colour is it and does it smell burnt?

When it skips drive do you get any noises and if so can you isolate where they are coming from?

Edit, if it skips regular as clockwork at 3 - 3.5 turns surely that must be a mechanical fault, like a stripped gear? If it was the gearbox, which is essentially a hydraulic pump (sort of), then it would be an irregular fault? But if it was a gear in the IRD the oil would contain shrapnel....hmmmm
Click to expand...

thats a thought, i have just checked the front wheels to see if the earlier type was fitted and catching on the callipers but not them
 
does anyone know if an ird was at fault can it be some other gears not insight that would cause this and have no bits of metal in the oil????

cheers
 
Does it suddenly lock when changing to second gear?

You could try putting your foot on the brake, select drive then pull gear lever right then backwards to put it in 1st gear only. Dash will display 1. Then take your foot oft the brake and see if it happens with auto fixed in 1st gear while you tick over while moving forwards.

Also pull away in 2nd. Put your foot on the brake, select drive then pull gear lever right then push forwards to put in 2ndst gear only. Dash will then display 2. Then take your foot oft the brake and see if it happens with auto fixed in 2nd gear while on tick over moving forwards. May need a few more revs here.

You could try reverse too.

Can’t guarantee any of this will help, but it’s free. If it was a missing tooth on a gear then I guess it could snap clean oft without splinters of metal.
 
Hippo said:
Does it suddenly lock when changing to second gear?

You could try putting your foot on the brake, select drive then pull gear lever right then backwards to put it in 1st gear only. Dash will display 1. Then take your foot oft the brake and see if it happens with auto fixed in 1st gear while you tick over while moving forwards.

Also pull away in 2nd. Put your foot on the brake, select drive then pull gear lever right then push forwards to put in 2ndst gear only. Dash will then display 2. Then take your foot oft the brake and see if it happens with auto fixed in 2nd gear while on tick over moving forwards. May need a few more revs here.

You could try reverse too.

Can’t guarantee any of this will help, but it’s free. If it was a missing tooth on a gear then I guess it could snap clean oft without splinters of metal.
Click to expand...
ok cheers will give that a try in the morning as i have just drained the oil out the auto box

its a thin as water and black, doesn't smell burnt but don't look good, but would this make the wheels spin 3 times then lock up???

cheers
 
The ATF sounds like it defo needs freshening at the least if not a full flush. IIRC you can only see one side of the diff gears inside the IRD. That would be my guess.
 
stewart09 said:
The ATF sounds like it defo needs freshening at the least if not a full flush. IIRC you can only see one side of the diff gears inside the IRD. That would be my guess.
Click to expand...


hello
from under the car you can see 2 gears 1 each side of where the prop input shaft goes, not sure if this is where they normally shear or further inside the unit.

cheers
 
to be honest i cant see the oil making it lock up on every 3/3.5 turn of the road wheel, when it was all on the ground so under body/engine weight it would roll under its own power in drive but no pedal applied without the lock up but as soon as applied power it locked.

its got to be something thats turns at a 3/3.5 ratio but saying that clearly i'm no expert lol
 
Last edited:
Freelaner said:
the one on the left is the crown wheel and the other side is the laygear
Click to expand...


ok so from under the car looking into the hole left by the prop input shaft the left is the crown wheel???

both of these seem fine no bits missing or chewed up

cheers
 
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