Change gearbox oil now clutch slipping

finbarr saunders · 23rd January 2018, 21:42

After having my slave cylinder changed a few months ago I noticed gear selecting felt tighter than before, Anyhow yesterday I decided to check the gearbox oil, As I drained out the oil it was obvious that the garage had put in the wrong stuff as it was yellow in colour unlike the awful smelling pink stuff I got to replace it (MTF 94 that smells a bit like cats pee!), I let the box drain for a good 10 mins to get out as much of the other stuff as I could, Then I put in just under 2 litres of the proper stuff, The gears now feel nice & smooth but the problem now is that i am getting an awful clutch slip,
I can only assume that gear oil is now finding it's way onto the clutch, Could this be that I have too much oil in the box or is it something more sinister?

EastPete · 24th January 2018, 08:34

2 litres is a bit too much - the gearbox should only take 1.6 litres. I am not sure why this overfill would result in the clutch clipping, unless the oil seal behind the guide tube is leaking.

I assume the clutch plate/pressure plate were replaced at the same time as the slave - it is false economy not to.

Do you know what make of slave cylinder was fitted ? Is there any sign of oil or clutch fluid leak from the holes at the bottom of the bell housing ?

Have you checked the fluid level in the clutch master cylinder to see if you are losing fluid from the clutch hydraulics ?

The problem now is since the clutch is slipping, this suggests the clutch driven plate has become contaminated (either with gear oil or clutch fluid), and it will need to be changed, so it is a gearbox off job once again. Sorry !!

Pete

finbarr saunders · 24th January 2018, 18:43

Cheers for that, I must confess that I only had the slave changed as the clutch was pretty new & was replaced by the last owner shortly befre I bought it, The guy that done the job for me did check the clutch & said it had plenty left on it, The slave I had fitted is a Lucas unit so not some 2 bob mickey mouse thing,
I was thinking maybe the gearbox oil seal is kaput & so I would like to locate one from somewhere, I have got a new clutch kit at the ready so it's a matter of finding the time as well as a break in the weather

,
as for checking the fluid level in the master cylinder, that has got to be the most awkward thing to do.

patrolman pete · 24th January 2018, 20:55

Check for gearbox oil leaking from the hole in the bell housing to be sure.

finbarr saunders · 16th April 2018, 19:19

I know it's been a while since my original post as I have had the use of another car, Anyhow today I decided it's time to investigate my clutch woes & fit another clutch as I am missing the old girl, Managed to juggle the gear box to one side & looked inside the bell housing, Was greeted by a slave cylinder that had fallen apart (came unclipped) the moment the box was pulled away

, I think it's safe to say that I should change it even though it's only a few months old instead of trying to clip it back together, Lots of wet stuff inside the bell housing which looks to be oil rather than brake fluid even though the main shaft & sleeve/oil seal seem dry,
Any other suggestions as to what to look for that might be causing this?, Just the lube from the slave perhaps?
Oh & what size Torx bit do I need for the clutch cover plate bolts as I cant find one to fit in what's left of my Torx set

,,,,,,Cheers.

MSS · 16th April 2018, 19:26

Quote:

Originally Posted by finbarr saunders

Cheers for that, I must confess that I only had the slave changed as the clutch was pretty new & was replaced by the last owner shortly befre I bought it, The guy that done the job for me did check the clutch & said it had plenty left on it, The slave I had fitted is a Lucas unit so not some 2 bob mickey mouse thing,
I was thinking maybe the gearbox oil seal is kaput & so I would like to locate one from somewhere, I have got a new clutch kit at the ready so it's a matter of finding the time as well as a break in the weather

,
as for checking the fluid level in the master cylinder, that has got to be the most awkward thing to do.

I suspect your slave is most probably a "2 bob mickey mouse thing". It is most likely a cheaply made generic item.

Fit an Luk or AP for quality.

finbarr saunders · 16th April 2018, 20:11

Got the slave on order, Now i have to order some more Torx bits so it would be appreciated if somebody could let me know the size for the clutch cover bolts,,,,Ta!.

EastPete · 17th April 2018, 08:29

Quote:

Originally Posted by finbarr saunders

Got the slave on order, Now i have to order some more Torx bits so it would be appreciated if somebody could let me know the size for the clutch cover bolts,,,,Ta!.

6mm hex bolts on mine

Which slave have you ordered ?

Pete

finbarr saunders · 17th April 2018, 12:00

I never thought of hex bolts to be honest,

, It's just that I read somewhere that they were torx & what with the limited view of them plus my NAUGHTY WORD-NAUGHTY WORD-NAUGHTY WORD-NAUGHTY WORD- eyesight that's why I was asking,
As for the new slave cylinder I am not sure what make it is, It's because I contacted the seller who guaranteed the last one & he assures me that the new one will be of better quality, & as It'll be a free replacement I can make my own mind up when it arrives.

finbarr saunders · 17th April 2018, 12:02

Whats with the "NAUGHTY WORD" thing?, I didn't use any.

23rd January 2018, 21:42	#1
finbarr saunders Avid contributor ROVER 75 Tourer Join Date: Oct 2015 Location: Worksop, Notts Posts: 106 Thanks: 30 Thanked 8 Times in 7 Posts	Change gearbox oil now clutch slipping After having my slave cylinder changed a few months ago I noticed gear selecting felt tighter than before, Anyhow yesterday I decided to check the gearbox oil, As I drained out the oil it was obvious that the garage had put in the wrong stuff as it was yellow in colour unlike the awful smelling pink stuff I got to replace it (MTF 94 that smells a bit like cats pee!), I let the box drain for a good 10 mins to get out as much of the other stuff as I could, Then I put in just under 2 litres of the proper stuff, The gears now feel nice & smooth but the problem now is that i am getting an awful clutch slip, I can only assume that gear oil is now finding it's way onto the clutch, Could this be that I have too much oil in the box or is it something more sinister?

24th January 2018, 18:43	#3
finbarr saunders Avid contributor ROVER 75 Tourer Join Date: Oct 2015 Location: Worksop, Notts Posts: 106 Thanks: 30 Thanked 8 Times in 7 Posts	Cheers for that, I must confess that I only had the slave changed as the clutch was pretty new & was replaced by the last owner shortly befre I bought it, The guy that done the job for me did check the clutch & said it had plenty left on it, The slave I had fitted is a Lucas unit so not some 2 bob mickey mouse thing, I was thinking maybe the gearbox oil seal is kaput & so I would like to locate one from somewhere, I have got a new clutch kit at the ready so it's a matter of finding the time as well as a break in the weather, as for checking the fluid level in the master cylinder, that has got to be the most awkward thing to do.

16th April 2018, 19:19	#5
finbarr saunders Avid contributor ROVER 75 Tourer Join Date: Oct 2015 Location: Worksop, Notts Posts: 106 Thanks: 30 Thanked 8 Times in 7 Posts	I know it's been a while since my original post as I have had the use of another car, Anyhow today I decided it's time to investigate my clutch woes & fit another clutch as I am missing the old girl, Managed to juggle the gear box to one side & looked inside the bell housing, Was greeted by a slave cylinder that had fallen apart (came unclipped) the moment the box was pulled away, I think it's safe to say that I should change it even though it's only a few months old instead of trying to clip it back together, Lots of wet stuff inside the bell housing which looks to be oil rather than brake fluid even though the main shaft & sleeve/oil seal seem dry, Any other suggestions as to what to look for that might be causing this?, Just the lube from the slave perhaps? Oh & what size Torx bit do I need for the clutch cover plate bolts as I cant find one to fit in what's left of my Torx set,,,,,,Cheers.

24th January 2018, 08:34	#2
EastPete Posted a thing or two Rover 75 CDTi Classic saloon, MGB GT, Skoda Yeti Join Date: Aug 2008 Location: Ramsey, Cambs Posts: 1,874 Thanks: 626 Thanked 635 Times in 430 Posts	2 litres is a bit too much - the gearbox should only take 1.6 litres. I am not sure why this overfill would result in the clutch clipping, unless the oil seal behind the guide tube is leaking. I assume the clutch plate/pressure plate were replaced at the same time as the slave - it is false economy not to. Do you know what make of slave cylinder was fitted ? Is there any sign of oil or clutch fluid leak from the holes at the bottom of the bell housing ? Have you checked the fluid level in the clutch master cylinder to see if you are losing fluid from the clutch hydraulics ? The problem now is since the clutch is slipping, this suggests the clutch driven plate has become contaminated (either with gear oil or clutch fluid), and it will need to be changed, so it is a gearbox off job once again. Sorry !! Pete

24th January 2018, 20:55	#4
patrolman pete Posted a thing or two Rover 75 club se tourer CDT and a Connoisseur SE Diesel Auto Saloon Join Date: Nov 2006 Location: Houghton - le - Spring Posts: 1,418 Thanks: 618 Thanked 333 Times in 197 Posts	Check for gearbox oil leaking from the hole in the bell housing to be sure.

16th April 2018, 20:11	#7
finbarr saunders Avid contributor ROVER 75 Tourer Join Date: Oct 2015 Location: Worksop, Notts Posts: 106 Thanks: 30 Thanked 8 Times in 7 Posts	Got the slave on order, Now i have to order some more Torx bits so it would be appreciated if somebody could let me know the size for the clutch cover bolts,,,,Ta!.

17th April 2018, 12:00	#9
finbarr saunders Avid contributor ROVER 75 Tourer Join Date: Oct 2015 Location: Worksop, Notts Posts: 106 Thanks: 30 Thanked 8 Times in 7 Posts	I never thought of hex bolts to be honest, , It's just that I read somewhere that they were torx & what with the limited view of them plus my NAUGHTY WORD-NAUGHTY WORD-NAUGHTY WORD-NAUGHTY WORD- eyesight that's why I was asking, As for the new slave cylinder I am not sure what make it is, It's because I contacted the seller who guaranteed the last one & he assures me that the new one will be of better quality, & as It'll be a free replacement I can make my own mind up when it arrives.

17th April 2018, 12:02	#10
finbarr saunders Avid contributor ROVER 75 Tourer Join Date: Oct 2015 Location: Worksop, Notts Posts: 106 Thanks: 30 Thanked 8 Times in 7 Posts	Whats with the "NAUGHTY WORD" thing?, I didn't use any.