Impact Pin Nightmare 220D - Mercedes-Benz Forum

 
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post #1 of 9 (permalink) Old 06-30-2014, 06:59 PM Thread Starter
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Impact Pin Nightmare 220D

So I need a new head gasket (oil in the coolant, coolant in the oil and both going through the combustion chambers). I've got it all apart except for the "rail tensioner", which is held by an impact pin down between the water pump and the shaft pulley. It's threaded for an M8 bolt, and I was using a bolt to pull it out when the head of the pin sheared away from the shaft. So I try drilling it out. I got partway through, enough to loosen the leading edge of the tensioner, and then went awry. Now what? A hacksaw blade down beside the tensioner? Can I get at it better through the oil pan?

Last edited by Cheetahpop; 06-30-2014 at 07:44 PM.
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post #2 of 9 (permalink) Old 07-01-2014, 08:10 AM
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head gaskets dont fail , the head does crack inside prechambers hole .
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post #3 of 9 (permalink) Old 07-01-2014, 08:37 AM
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Originally Posted by agillot View Post
head gaskets dont fail , the head does crack inside prechambers hole .
How is that relevant to his current problem? To the OP, you got a photo of your situation?

Felicita e un bicchiere di vino con un panino.
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post #4 of 9 (permalink) Old 07-01-2014, 10:16 AM Thread Starter
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Hear are some pics... The first is from above, looking down at the tensioner. the second is the area of the pin holding the far bottom of the tensioner, half drilled out. I got the front edge, but need to get the back edge... I'm gonna take the oil pan off and see what I can see. The pin is about as from the bottom as it is from the top.
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post #5 of 9 (permalink) Old 07-01-2014, 07:27 PM
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maybe try a easy out and get it to spin some and then pull out?

thread the hole you drilled and put another bolt in?
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post #6 of 9 (permalink) Old 07-01-2014, 08:08 PM Thread Starter
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Yeah, the fix is gonna have to be a bolt where that pin is now... To get the oil pan off, I need a long 5mm hex socket It'll be Thursday, probably when I can get to the hardware store. I've been twisting, pushing, pulling and banging. But it's still there. Thanks for the encouragement.
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post #7 of 9 (permalink) Old 07-02-2014, 10:06 AM
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i would cut off the upper part of rail , so you can pull head off , then , you will be closer to the problem .
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post #8 of 9 (permalink) Old 07-02-2014, 04:27 PM Thread Starter
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Yes, I have considered that... an obvious last resort. Thanks.

Last edited by Cheetahpop; 07-02-2014 at 06:21 PM.
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post #9 of 9 (permalink) Old 07-03-2014, 02:44 PM Thread Starter
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DONE! After getting the oil pan off, it was easy to see the pin, and some work with a hacksaw blade did the job. Initial exam of the head gasket shows no cracks or warping. I will look at it in detail as I clean it. the block, however, has oil around the 4th cylinder -- as if it were seeping under the head gasket. So this may just be the gasket...
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