Keith Hall

I have a ford sierra 2.0 DOHC with an MT75 gear box i just swapped and it wont engage the gearbox,clutch and bearing were good when i had it in the previous car,I changed the gear box fluid to ATF Dextron mk3.The clutch seems to disengage the flywheel fine i can see it coming off the flywheel about 1-2mm from the dust cover for the cable.I changed the clutch pedal in the hope it would fix it but no luck.It is not over filled either.Anyone have any ideas?

Keith Hall

Also i forgot to mention it goes into all the bottom gears like 2nd,4th and Reverse fine but abit hard to get into all the top gears like 1st,3rd and 5th.The will start and run fine in neutral but when i have the clutch to the floor and in gear it will only push the car foward as if the clutch isn't engaged?

jamie's

Does it select gears ok when the engine is switched off?

gcfcos

Could it be a possibility the clutch plate is fitted the wrong way round? Seen a couple of ex colleagues do that before!

jamie's

If it was ok on the old engine and not been disturbed then possibly wrong cable or quadrant on the newer car

Keith Hall

It selects the bottom 2nd,4th and Reverse fine but abit rough to get into 1st,3rd and 5th! No i hadn't touched the clutch in anyway when the engine was out.I switched the quadrant but still the exact same problem

iansoutham

sounds like the selector fork inside the gearbox is bent.

had the same on an old BC box in a mk5 Escort. Took it apart and the fork had a crack right through it.

Keith Hall

Would this be caused if the gear box had to much pressure put on the gear stick?

Keith Hall

I forgot to mention I took out an allen key bolt out of the side of the box which i thought was the refill but a spring had come out so i put it straight back in would that have caused a problem?

iansoutham

too much oil cause issues, but not that.

the spring may be related, but the spring does the horizontal return normally.

Keith Hall

Ya im fairly sure i have the right amount of oil in it now.Ok so you think the spring may not cause it? But if there was alot of pressure put on the gear stick would it cause the problem?

dojj

iTrader: (3)

is the selector moving at all?

they are prone to failing, but only the pin inside breaks

Keith Hall

It selects gears all the gears not running the top ones as i said abit rough! When running it wont go in at all even if you try to force it very hard not even a grind

cossie2

did anything fell out from the hole..small ball?

Keith Hall

It may have but i was nearly sure i put it all back in! Would that cause it?

rog

iTrader: (2)

100% a selector issue in my opinion, I snapped the whole selector cradle on my saph and it had same symptoms as this, especially if it's engaging other gears normally this proves the problem isn't at the clutch at all. Suggest you remove the box again and take a look inside it.

Keith Hall

Ya thats what i wasn't hoping to hear!!! I think your right tho! Would the forks get bent if too much pressure was put on the gear stick handle itself?

Keith Hall

Aswell tho why would the car move foward when the clutch is engaged whilst i try to start it?

R4N SS

iTrader: (6)

my mt75 doesnt go into any gears at all - suspect its the selector pin

ray barker

i would imagane this is your problem sumut els besides the spring might have come out or moved try undoing the allan bolt slighty and move the gear stick see if it will relocate it self or look on the workshop manual and see whats behind the plug and order it or take the plug out and put a telescopic pick up magnet in there and fish out whats in there try putting it back in again

Keith Hall

Ok ya i'll have a look into that first before i drop the box!

Keith Hall

Its this bolt NO.2 which i took out and it says it is a "Lock - Selector shaft" Sounds like it would cause the problem?

ray barker

look online at the workshop manual at the exploded view of the box it will tell you what individuals parts are

Rax

iTrader: (1)

Before pulling the box back out I would try resetting the quadrant . Just to see how much it adjusts back up .

Keith Hall

Just an update only got around to taking the box out now,When i took the driveshaft off i decided to start it to see if that was interfering with the selecting of gears and now i can change gears perfect but the clutch doesn't seem to do anything if i have it pushed in to the floor the end of the gear box keeps spinning?

ray barker

it will do that any way. i cant remember what they call it. its something like oil torque

ray barker

its only when you put the p shaft if makes more resistance to it. not all vehicles do it but it quite common

Keith Hall

Ya but i meant as in the forks inside the box are all good! I have the gear box out now and everything seems to be in place and nothing seems to be broken but i there is weird scrapes on the inside of the bellhousing? I'll upload pictures in an hour or so

Keith Hall

The inside of the gearbox bellhousing has some unusual scoring that wasn't there previously?
Everything else seems to be in place and intact?

stevieturbo

Hard to tell in a photo, but the release bearing looks fucked.

And the marks could somehow have come if you had the weight if the box hitting the ring gear or something

Keith Hall

Ya the throwout bearing was really really stiff! Would that have caused the clutch to not disengage?

stevieturbo

Not really no.

Did you actually take the clutch apart off the engine and inspect it ? Is the mechanism working ok and pedal feel ok ? ( although it's bound to feel odd with a fucked release bearing )

Keith Hall

Ya i took off the clutch and it was stuck to the pressure plate! But it seemed in ok condition still good thickness on the clutch itself! Springs seem fine too!

gcfcos

Like I said At the beginning mate it sounded like a clutch issue, I would put a new clutch kit and release bearing in while you've got the box out, their so cheap it would be silly not to I've just done a similar job on a Capri with the same sort of problems

Keith Hall

Ya yer dead right! And changing the clutch had fixed your problem? my clutch doesn't seem to wore out!

stevieturbo

There would be a rather huge clue as to the problem.

ray barker

the sleve on the first motion shaft where the thrust bearing slides up an down looks dryer than a whitches tit it looks like its seized on there. take the bellhousing of fit it to the engine and turn the engine by hand see if anything is catching. clean that shaft with emery cloth or sumut and paint copper grease on there and fit a new release bearing

Keith Hall

Ok i may just polish the pressure plate and get a new throw out bearing and see if that sorts the problem! Ahahaha it seemed to run pretty freely when i took the clutch out and aswell when it was on the car!

gcfcos

Yes the clutch had plenty of meat still on it but where it had sat for so long it had gone hard and shiny like brake pads do.

Keith Hall

Ohh alright ok! I thought that would nearly do the opposite and not grab at all!