Leaking Transmission, is it a good idea to put in a store bought sealer

General Discussion
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1

I’ve a 1987 merc 300 SL & the transmission is leaking. is it ok to put one of those sealers. if so is there a recommended brand.
Thanks
Paul
Car Novice

2

Where is the leak, exactly? Also, that model wasn’t imported by MB into the US. Where are you?

3

looks like it’s right under the gear box. I have never lifted up the car, so I wouldn’t know exactly,

4

Why don’t you figure out what the leak is, for starters

if it’s the kick-down solenoid seal(s) . . . for example . . . that could be fixed without removing the transmission

There’s also a few servo cover seals that can be replaced without removing the transmission, if memory serves

However, if it’s the front pump seal . . . which would not be surprising, given the age of the car . . . that’s not something that could be fixed properly without removing the transmission

5

There are really only two times when it makes sense to put sealant into an automatic transmission: “never” and “not ever”. At all other times, you should do one of two things: find and repair the leaking seal/gasket/hose connection, or just keep adding approved transmission fluid as needed.

1 Like
6

Thank you.
Should I go to a transmission shop or wait till I find someone that’s works on old cars here. I’ve a starting issue too, I’m told it’s the cold starting valve, but could be any part before or after that’s causing the valve to fail.
Paul Griffith

7

Thank You.
You took me off the fence, I’ll wait till I can find a guy that can work on these cars. I’ve a cold starting issue too. Which is less no because it’s hot.
Paul Griffith

8

Cold start valve, huh?

It’s a distinct possibility,

You need somebody that can hook up a fuel pressure gauge to a Bosch KE-Jetronic and interpret the results correctly

That probably rules out a lot of shops and/or mechanics