Replacing 76 300D motor with 77 - Mercedes-Benz Forum

 
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post #1 of 10 (permalink) Old 09-05-2016, 03:58 PM Thread Starter
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Replacing 76 300D motor with 77

Very new to this forum and still learning how to use it, also this is my first post! I just recently bought a 1976 300D and the motor is locked up, the previous owner in 1999 put a hole in the oil pan and ran it dry and locked it up, pulled the oil pan, shreds of everything you can think of, even the block itself. I found a 1977 300D motor and was wondering if it is a direct bolt in or what? Also should I just pull the motor or the whole motor and transmission at once?
Thank you!
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post #2 of 10 (permalink) Old 09-06-2016, 06:38 AM
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The answer is "no". The 1976 is a W115 body and the 1977 is a W123. The oil filter is mounted in a different place on the W123. There are a couple of other minor differences which can be dealt with but the filter location is the deal breaker.
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post #3 of 10 (permalink) Old 09-06-2016, 06:45 AM Thread Starter
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Thank you for the reply! So would the oil filter prevent the from mounting in correctly?
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post #4 of 10 (permalink) Old 09-06-2016, 08:28 AM
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Yes, the oil filter housing on the '77 is mounted at the upper left rear of the engine. The W115 chassis has cross braces across the top portion and the body fender structure is different along with brake booster mountings which are in the way.
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post #5 of 10 (permalink) Old 09-06-2016, 10:08 AM Thread Starter
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Oh I see, so would you recommend me trying to get it in there or looking for a w115 motor?
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post #6 of 10 (permalink) Old 09-06-2016, 11:01 AM
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Go for the OM617 (pre-77) engine which will fit into the W115 chassis. You might find it easier to source a OM616 engine from a pre-'77 240D. The pre-'77 OM617 is kind of a rare bird. They were only available in the 300D line for 2 years, 1975 and '76. In 1977 the W115 line was dropped and was replaced by the W123.

You are sure the car is a W115, yes? 1976 was a transition year for the 300D line. Very late 1976 model year cars were actually W123's.

Last edited by Mike D; 09-06-2016 at 11:06 AM.
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post #7 of 10 (permalink) Old 09-06-2016, 03:11 PM Thread Starter
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Well I'm assuming just from this that its a 115?
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post #8 of 10 (permalink) Old 09-06-2016, 03:41 PM
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Yup.


http://www.auto-parts.spb.ru/cat/cat...&client=dr2000


select #1

Last edited by Mike D; 09-06-2016 at 03:44 PM.
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post #9 of 10 (permalink) Old 09-07-2016, 07:13 AM Thread Starter
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Awesome, thank you!
Finally got the motor out last night
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post #10 of 10 (permalink) Old 09-07-2016, 09:38 AM
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It's easiest to install the engine and transmission as a single unit. The top two bolts on the bell housing are triple mother-humpers to install when in the chassis. It's also quite a pain getting the angle correct on the front heavy engine.
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