Yup, this one has it, just like a snowmobile. When I did the thermostat I
pulled the bolt and filled the housing, then left it out until water started
gushing out.
-Curt
From: David Bruckmann via Mercedes <mercedes@okiebenz.com>
To: Mercedes Discussion List <mercedes@okiebenz.com>
Sent: Tuesday, January 6, 2015 10:11 PM
Subject: Re: [MBZ] Compression good
The early OM61x engines have an air bleed bolt over the thermostat. If you have
a leak and air is getting trapped in the space above the thermostat, it could
be preventing the thermo from opening properly.
On 1/7/15, Dimitri wrote:
>
>Yes, I replaced tstat with a new MB unit from the classic center. It made no
>difference.
>There is a short hose under the tstat housing which leaks. After the car is
>driven and comes to normal operating temp, this hose will leak coolant. I'm
>theorizing that once the coolant cools and de pressurizes, air is drawn into
>this leaking coolant hose creating air bubbles.
>This might be the problem.
>If the bolts were bottomed out, wouldn't the engine lose compression as the
>head is not tight to the block? It started in frigid temps this am. Makes me
>wonder.
>As far as the bolts go, did we come to the conclusion that it would be alright
>to remove one at a time, tap the hole and re-torque?
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