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Old 12-19-2017, 12:33 PM
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jay_bob jay_bob is offline
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Join Date: Oct 2011
Location: Columbia, SC
Posts: 3,941
Originally Posted by ObsoElitist View Post
A thermostat is the cheapest and first move on nearly any cooling system problem.
True statement. However please be wary of the fragility of the thermostat housing bolts on the OM616/OM617. It is stupid easy to snap these off and then you just went from an easy repair to a PITA.

If you are going this route be sure to obtain some AeroKroil and treat the bolts daily for several days before attempting to turn them. And when you do turn them use a 1/4 drive socket and very gentle torque. Another pro tip, very gently and slightly tighten them first, then start to loosen.
The OM 642/722.9 powered family
Still going strong
2014 ML350 Bluetec (wife's DD)
2013 E350 Bluetec (my DD)

both my kids cars went to junkyard in 2023
2008 ML320 CDI (Older sonís DD) fatal transmission failure, water soaked/fried rear SAM, numerous other issues, just too far gone to save (165k miles)
2008 E320 Bluetec (Younger son's DD) injector failed open and diluted oil with diesel, spun main bearings (240k miles)

1998 E300DT sold to TimFreeh
1987 300TD sold to vstech
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