Okay, here goes. I have spent several hours per day over the course of 10 days replacing a 190E water pump. I compare it to heart transplant surgery even though I have never performed heart transplant surgery. Several tips have been passed on to me and I appreciate all input. Now I am down to removing the blessed bolts. There are (4) total as most of you know. The two bolts in the rear are laughing at me because all I have been able to do is tickle them. The allen wrench bolt in the front is annoyed because I have been trying to wake him from his sleep and he won't get out of bed. The front bottom bolt is in hibernation.

Is there any tool and/or tips on how to get the bolts off! I am more concerned with the rear bolts and the crevice that they reside in. Please toss me some hope,

John

There is a tool made by Snap-On that people use. Do a search and you'll find plenty of info and a part number.

I went to Sears and bought the sockets with the U-joint built in. Worked fine for me and cost a lot less.

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2012 E350
2006 Callaway SC560

John, if your 190E water pump is like the one in a 1991 300CE a 6mm allen wrench and a 13mm Craftsman socket with a universal joint plus several extensions will handle the job. For the allen bolt be sure to properly align the allen wrench, apply pressure with one hand, and hit the end of the allen wrench with a 5lb. hammer to break the bolt loose. For the other 3 hex head bolts use the 13mm universal joint socket and a breaker bar w/extensions, as required, to break the bolts loose. The water pump replacement takes patience and persistence ... whatever you do make sure not to damage the allen bolt or the hex heads. Insert the water pump/head O-ring into the pump recess and smear some grease over it to hold the O-ring in place when installing the new water pump.

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Fred Hoelzle