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#1
12-02-2013, 03:27 PM
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Why is there a hole behind the alternator bracket?
My alternator shook apart a few weeks ago so I took the bracket off the side of the motor to be wielded and bent back the other night. As soon as I got it off a good cup full of sludge fell on the ground and the back of the bracket was filled with it. After blasting it with brake cleaner I found a 10mm hole in the side of the block, it was a smooth bore so I'm guessing mercedes put it there. Any ideas why it's there and is it ok for me to seal it?
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84 300sd 2.47 dif 360k 26 mpg needs lots of love given to me in pitty 89 civic hatchback auto 140k 33mpgs soon to be low to mid 40's been in the family since mile 1 85 300d with unknown knock. driven over 30k with knock and still going. sold for $800 
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#2
12-02-2013, 03:34 PM
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Post a photo. I had my alternator bracket off, and thoroughly cleaned the block on a stand, but don't recall such a hole. Often holes or pads are in a casting for later machining for different accessories - say components on other side for British or truck markets, industrial engines and such. It seems unusual if the bore was machined smooth and it wasn't used. The cam chain tensioner installs somewhere around there, probably lower.
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#3
12-02-2013, 04:08 PM
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I'm guessing that they had some extra holes at the factory and needed to use them up. You know that the Germans wouldn't waste anything.
Dan
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#4
12-02-2013, 09:17 PM
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I'm thinking pics would be a good idea before you do any kind of sealing.
Trying to think what it could possibly be. The block heater is in that area but that would be open to coolant. Aft of that, there is the front bracket for the starter.
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Sam 84 300SD 350K+ miles ( Blue Belle )
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#5
12-03-2013, 10:22 AM
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Sorry guys. The temp was dropping so I threw it back together. I talked to an old mercedes guy, and the best he could come up with is it was so kind of hole for inspecting the crankshaft. Filled it with the right stuff, no more leaks
 . It went right through the block I could have sworn you could touch the balancers on the crankshaft with a long screw driver.
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84 300sd 2.47 dif 360k 26 mpg needs lots of love given to me in pitty 89 civic hatchback auto 140k 33mpgs soon to be low to mid 40's been in the family since mile 1 85 300d with unknown knock. driven over 30k with knock and still going. sold for $800
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#6
12-03-2013, 10:47 AM
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Quote:
 Uhhhh, that's sounds crazy!!!!
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#7
12-03-2013, 12:53 PM
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There is a shield with bolt holes. There is pic of the 617 in my 84SD before I got it cleaned off at the link below.
http://www.peachparts.com/shopforum/diesel-discussion/341966-wife-said-sd-wouldnt-shut-off-led.html
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85SD 240K & stopped counting painted, putting bac together. 84SD 180,000. sold to a neighbor and member here but I forget his handle. The 84 is much improved from when I had it. 85TD beginning to repair to DD status. Lots of stuff to do.
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#8
12-12-2013, 07:18 AM
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well the leak stopped. i have no idea what they were thinking at the factory that day. maybe someone got a new toy and wanted to try it out? or maybe someone bored it out for camera or something to go in it.
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84 300sd 2.47 dif 360k 26 mpg needs lots of love given to me in pitty 89 civic hatchback auto 140k 33mpgs soon to be low to mid 40's been in the family since mile 1 85 300d with unknown knock. driven over 30k with knock and still going. sold for $800
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#9
12-12-2013, 08:54 AM
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we really need a picture of this next time you have it apart.
The fact that you have a smoothbore hole directly into your oil system makes me believe that its some kind of drain from the SD air cleaner setup and or inspection hole that required a rubber grommet, but ive never heard of such a thing in the side of the block like this, and just held closed via sludge for so many miles. Weird
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This post brought to you by Carl's Jr.
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#10
12-12-2013, 09:36 AM
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hey i'v got a mystery leak too......started the day i put everything back together after tearing it all down......now it leaks less, must be gunking up, but its down there somewhere, i assumed on the main front seal, but maybe a bolt or something missing
 but i never could see anything...... anyways, all the things on my list have gotten done, so soon im going to have to locate it and do away with it.....
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-Justin I believe in extreme automotive perfection whenever possible.......there is no such thing as "It doesn't matter" !!! 1985 300 CDT - 287k miles 1980 240 D - 340k miles With extras !!  http://facebook.com/BenzDieselTuner http://facebook.com/SWFLAlternativeFuelsClub http://facebook.com/SWFLBenzClub http://SWFLBenzClub.com
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#12
12-14-2013, 09:22 AM
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awesome pic, thank you !!!
i will definately help me locate my mystery leak, what a great view
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-Justin I believe in extreme automotive perfection whenever possible.......there is no such thing as "It doesn't matter" !!! 1985 300 CDT - 287k miles 1980 240 D - 340k miles With extras !! http://facebook.com/BenzDieselTuner http://facebook.com/SWFLAlternativeFuelsClub http://facebook.com/SWFLBenzClub http://SWFLBenzClub.com
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