torque converter help / opinion (keep it simple please) (1 Viewer)

Affiliate links here may earn MHF compensation
Feb 24, 2013
13,234
101,980
Bolsover, Derbyshire
Funster No
24,833
MH
Hymer S800
Exp
not long enough
we have an odd 'issue' with our MH, we have recently found and eventually resolved a leak on our auto gearbox, may be a coincidence but while we had a leak we seemed to develop a problem

when cold we need a lot of revs to do anything, seems to be fine when run for a few minutes, so we now start up and leave on tick over for a few minutes before moving off

our pet mechanic thinks it is possibly the torque convertor, we have been back today to make sure enough oil was put back in and check for new leaks, both checked perfect

so he says it mat be the torque convertor and off the top of his head thinks a minimum £1K but hopefully not £2K

but he says, if it were mine I would start up and let it run for a few minutes, only cost a bit of diesel each time, there is a chance it might not be the torque convertor which would waste the money

I have no idea what this component even does, don't really need to know to be honest, but those of you that know about these things would you fix it or carry on doing as we do now? :)(y)
 
Aug 30, 2012
4,270
11,308
Home of the war horse
Funster No
22,676
MH
burstnar T640
Exp
2010
Have you changed oil and is there a filter
Old oil does break down after time and will slip
Has it overheated at any time this will break oil down as well
If you do change it beware of cheap oil make sure. It's a good qualty and correct grade
We get problems like this on cranes often and it is usually a simple fix
Mind at 25 grand for a recon gearbox you try owt first :whistle:
 

musson

Free Member
Dec 25, 2013
487
165
grantham
Funster No
29,456
MH
low profile
Exp
since Jan 2014
Have you tried a new filter and fresh oil, I would try this first its the cheapest and if it has never been change it needs doing anyway if it turns out to be the torque converter there was a company in canock chase that refurbs them but cannot remember name (its me age)
 

JeanLuc

Free Member
Nov 17, 2008
3,304
2,199
Warwickshire
Funster No
4,952
MH
Hymer B630 Star-Line
Exp
Since 2007
Mine is an older Merc auto box than yours (2003 and five speed) but very occasionally, when it is cold and I've just started up, it sometimes seems to take more revs than normal to 'grip' - particularly when manoeuvring out of the drive. I discussed this with the Mercedes technical help line and they thought there was nothing likely to be wrong - just the need to let the fluid warm up a bit which is best achieved by driving.
The service interval for fluid change on the auto box is 120,000 kms (75,000 miles) so I suspect yours is not in need of changing. Having said that, I had ours changed after purchase (second hand). That was about 40,000 miles ago so I've got some time to go before the next change.
 

davejen

Free Member
Aug 21, 2008
1,861
1,235
Preston
Funster No
3,770
MH
Given up travelling
Exp
Since 1992
Remember when you change the oil/filter that it has to get up to operating temp before you can check the level (unless the dipstick has cold & hot marks.
Hope this helps
Cheers, Dave(y)

Subscribers  do not see these advertisements

 

DBK

LIFE MEMBER
Jan 9, 2013
18,149
48,654
Plympton, Devon
Funster No
24,219
MH
PVC, Murvi Morocco
Exp
2013
I find it very hard to think what could go wrong with a torque converter. Essentially it is like two propellers, one attached to the engine and the other attached, through gears to the wheels. When the engine side propellor turns it directs oil towards the other propellor and makes it turn as well. OK, it's not quite as simple as that as there is a third set of blades which sits between them and it is this which increases the torque (drive) to the wheels.

Providing it has the right oil in it what is to go wrong, unless the blades/vanes are hugely worn from running with contaminated oil for a very long time.

My advice would be to find a specialist autobox repairer and get their advice, unless you are sure your guy knows what he is doing, but diagnosing faults in these boxes can be very tricky.
 
OP
OP
DavidG58
Feb 24, 2013
13,234
101,980
Bolsover, Derbyshire
Funster No
24,833
MH
Hymer S800
Exp
not long enough
Thanks all, my technical skill is not far above nil, the gearbox oil was changed when the leak was thought to be the gearbox sump gasket, that was done less than 500 miles ago, the leak then got much worse and turned out to be a switch connection higher up that then ran down and round the sump gasket. That switch was replaced and the oil topped up

Mercedes issue (sell) a dipstick with hot and cold levels on it and a cap on the dip tube that has to be replaced each check

I don't know if the gearbox oil has a filter or if it was changed if there is one, I would disappointed if it wasn't if we have one, our mechanic is a long established family friend and he knows we have done whatever is needed

@JeanLuc I like this reply Philip, and hope that is going to be my solution, a few minutes tick over (provided it isn't before 08:00 on a rally field :LOL::LOL::LOL: will be how we proceed. I think I am linking the leak with a worsening of the problem in my head rather than actual change

I really appreciate the input for all (y)
 

Sundowners

LIFE MEMBER
Oct 30, 2007
3,289
3,571
Suffolk/Central Portugal
Funster No
744
MH
A class
Exp
37 years
If the oil is at all brown/burnt it most be changed-------I would start the engine (cold) and shift the gear selector through the gate pausing at each point before putting in drive and moving.-------The correct oil level is critical
 
Aug 18, 2014
24,033
136,867
Lorca,Murcia,Spain
Funster No
32,898
MH
Transit PVC
Exp
16 years since restarting
My car does it. Far as I am concerned it is a Maf/ecu fault .My auto.box oil is changed every 30k kms.
Mine only started doing it after the Maf was changed. Just let it run for 30 seconds or so.
Mine has been doing it 5 yrs & only does it on first start up , regardless of when it is. I.e. if I don't use the car until late afternoon on a July day where it is 70ºc+ inside the car & 40ºc ambient it will still do it.
If it was anything to do with temperature it wouldn't.

Just remembered the " keep it simple "
MAF= Mass air flow sensor.
here;

http://en.wikipedia.org/wiki/Mass_flow_sensor

Subscribers  do not see these advertisements

 
Mar 21, 2009
1,374
879
Harwich, Essex
Funster No
5,989
MH
Adria Twin Sport
Exp
25 years
Hi David
Have a word with MB there are several so called "flashes" which updates the ECU if problems occur.
This happens with many manufactures and is quite common, i know from experience that MB are one of the best company's to deal with even with older models.
Tony
 

Join us or log in to post a reply.

To join in you must be a member of MotorhomeFun

Join MotorhomeFun

Join us, it quick and easy!

Log in

Already a member? Log in here.

Latest journal entries

Funsters who are viewing this thread

Back
Top