ssangyong 722.6 merc auto gearbox clunk noise - Mercedes-Benz Forum

 
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post #1 of 5 (permalink) Old 08-25-2016, 06:36 AM Thread Starter
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Unhappy ssangyong 722.6 merc auto gearbox clunk noise

hi all i have a ssangyong rodius with a Mercedes 722.6 auto gearbox , when i bought the car second hand i took to my local gagarge always use the same one , he did a full service new filter , gear oil etc , within 5 mins of leaving the garage the car started to make a clunk noise when you put your foot down , when the car reaches 30 mph you hear a clunk it does not do it in any other gear or speed , been back to the garage which stated it was the gearbox mounting (( NOT )) then it was front prop shaft (( NOT )) then the rear prop shaft (( NOT )) after all the parts renewed the noise is still there , now they tell them that the gear box has failed and it needs a new one , but what i cant understand is why only at 30 mph if the gearbox is failing , and why only after a service , the gear box has been flushed several times and still no joy , they said it could be dirt in the oil , please help its making my life hell
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post #2 of 5 (permalink) Old 08-25-2016, 08:13 AM
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Your local garage lacks the skills/knowledge/tools required to fix this problem. Unfortunately it's time to cut your losses with them and find a new mechanic - one with experience in repairing Merc gearboxes.

The reason your local mechanic wants to replace the transmission is because he doesn't know how to repair it. It's probably something really simple like incorrect fluid level - normally you need to check and correct the level after driving, following a fluid change & flush. (This requires a special dipstick that isn't fitted to the car like the engine oil dipstick.)

If that doesn't fix it, the gearbox needs disassembly to remove and clean the sticky valve.

You can check out this table of causes. See "Shudder in 2 -> 3 power upshift", two rows:
http://manual.startekinfo.com/manual...d1/2_3/m13.jsp

Last edited by DrX; 08-25-2016 at 08:15 AM.
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post #3 of 5 (permalink) Old 08-25-2016, 10:40 AM Thread Starter
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Originally Posted by DrX View Post
Your local garage lacks the skills/knowledge/tools required to fix this problem. Unfortunately it's time to cut your losses with them and find a new mechanic - one with experience in repairing Merc gearboxes.

The reason your local mechanic wants to replace the transmission is because he doesn't know how to repair it. It's probably something really simple like incorrect fluid level - normally you need to check and correct the level after driving, following a fluid change & flush. (This requires a special dipstick that isn't fitted to the car like the engine oil dipstick.)

If that doesn't fix it, the gearbox needs disassembly to remove and clean the sticky valve.

You can check out this table of causes. See "Shudder in 2 -> 3 power upshift", two rows:
STAR TekInfo
thanks for that the car has been flushed a few times still the same , apart from the clunk noise the car shows no other symptoms at all , no sticking gears , no disappearing gears , so im still at a loss at whats happened , i now know the garage cant handle the car , its not the first time he has serviced one of these gearboxes , i had another one which he did perfect , what would clunk at 30mph and not before or after and if it is the valve would it make the car clunk .
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post #4 of 5 (permalink) Old 08-25-2016, 05:31 PM Thread Starter
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update

after having someone capable of doing the job have a look , turns out its the drive chain , so a new gearbox is on order , thanks for your help
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post #5 of 5 (permalink) Old 08-26-2016, 12:33 AM
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Originally Posted by shaz27 View Post
... what would clunk at 30mph and not before or after and if it is the valve would it make the car clunk .
Geez, I dunno. Maybe shifting up a gear from 2nd to 3rd under power?

Foreign matter could interfere with the valve operation and cause a clunk during this gear change. So can incorrectly installed ATF filter.

This guy shows how to remove and check the valves:

However, if you want to go ahead and replace the whole gearbox, it's up to you.
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