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Old 05-13-2019, 12:41 PM
Registered User
Join Date: May 2019
Posts: 4
m103 (190e 2.6) fitting in block under #5 exhaust port

On my 1989 190e 2.6, there is a fitting in the engine block with a bulb end and approx. 1/2 inch ID. What is this fitting for?

I've attached a photo of it, circled in yellow.

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m103 (190e 2.6) fitting in block under #5 exhaust port-pic28.jpg  
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Old 05-13-2019, 01:34 PM
slk230red's Avatar
WECO Installer
Join Date: Jul 2006
Location: Tampa, FL
Posts: 819
It's a block coolant drain valve.

1993 190E 2.3
2001 SLK230
1971 LS5 (454) Corvette Convertible
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Old 05-13-2019, 03:19 PM
Registered User
Join Date: May 2019
Posts: 4
Excellent, thank you. I just wanted to confirm that its not supposed to be connected to anything.
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Old 05-14-2019, 05:37 AM
optimusprime's Avatar
Trevor Hadlington
Join Date: May 2014
Location: Worcestershire in England
Posts: 1,324
Yes wants to hope you dont need to open it from above its a pita .I worked over a day to open mine up just to drain the block with no success in the end .

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