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1974 W115 240D 3.0 Liter Turbo 4 Speed Manual

diametricalbenz’s PeachParts Mercedes-Benz Forum Photo Gallery
1974 W115 240D 3.0 Liter Turbo 4 Speed Manual
Bought it in 9/2004 from another Benz nut. It was originally titled as a North Dakota car at an airbase there. It moved to CA soon thereafter according to the records and then made it's way to the Santa Barbara area before changing hands.

No sunroof and reliable manual windows. I changed the battery to a Optima Red Top which is worlds better than the standard unsealed battery in my opinion. No acid leaks and the battery tray rusting problem is gone. The car has a passenger sideview pulled from a 280 by the previous owner who also installed rear speakers so it has 5 channels despite bridging the front left and right to the center dash speaker.

2.4L to 3.0L Conversion date August 2007! The engine is coming out and the new motor is going to be transplanted with the 300D motor. The engine is coming out, having the crankshaft removed, checked for tolerances and then balanced with the flywheel and pressure plate. A new clutch goes in with the drive shaft shortening. The ignition is hybridized to allow pull glow and starting capability but the key switch shuts the motor off via vacuum control. The A/C system will remain stock with the York compressor.

Update! February 2009 The engine is together, flywheel, and turbo. The turbo bearings have been coated with an ultra low friction compound for reduced friction losses. The "new" 617.910 is getting an oil filter conversion for easier access than from below. There simply was no cost effective way other than having a remote oil filter assembly custom made to reroute the oil filter if a OM617.95x motor was to be used. Additionally the W115 engine bay is narrower so it is questionable to know if the 95x motor would clear the turbocharger and exhaust manifold. The front end of the 300D donor will be transplanted onto the 240D to accomodate the extra weight.

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1974 W115 240D 3.0 Liter Turbo 4 Speed Manual - Photo 625 1974 W115 240D 3.0 Liter Turbo 4 Speed Manual - Photo 628 1974 W115 240D 3.0 Liter Turbo 4 Speed Manual - Photo 629 3.0L OM617.910 Turbo
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Member: diametricalbenz
Created: 04-27-2006 02:05 AM
Last Modified: 04-14-2016 04:40 PM
Views: 7817
Images: 4
Comments: 18

Author Comment Date
diametricalbenz There were a laundry list of issues, the oil filter, the exhaust manifold hitting the frame rail, driveshaft shortening by 4" or so and rebalancing, shorter shift rods and adjustment, the older cast iron case 4 speed transmission had to be used due to tolerances I believe. There is a flywheel balancing issue, the correct flywheel is much heaver and very difficult to find but a 240D manual flywheel can be substituted. There is also a balancing the crankshaft and flywheel together if you want it to be done "properly". You'll also need to swap out the rear differential to bring the revs down. The exhaust system will need to be modified to fit the hangers. The ignition system had to be hybridized since the original 240D was a mechanical shutoff. The pull knob was changed to actuate the GP action and starter. A vacuum ignition system was swapped in to shut off the IP. I am sure I am missing a few things like the speedometer cable and things of the like. There's a lot of documentation about 01-01-2017
luketmarx I'm gearing up to do this conversion on my own w115, I'm just in the research stage at this point. I've currently got a good motor, so not in a hurry to do the swap. Just the oil filter is the only issue on the swap? What about engine mounts? Would love more information on how your swap went. Thanks! 12-31-2016
diametricalbenz This doesn't have the oil filter plate, that was the reason for using a 617.910 and not a 617.95x. There may still be some people building them. 01-26-2012
sethza Where did you have the adapter for the oil filter made? It is possible! How inspiring... 01-26-2012
alabbasi So did you manage to bring this to Atlanta? 12-27-2010
MBeige Congrats Curtis! I wish I could see this old car of yours before it gets shipped to you. 12-27-2009
oldsinner111 Nice ride 12-22-2009
dieseldiehard Let us know about the custom oil filter, that's something I've been interested in for a long time, I might get fired up and do a similar conversion to my '72 220 (W115) already stick shift. I am using a 3.07 differential out of my ex-'83 300D turbo. It made a world of difference and I think you should plan to install a taller gear in the diff on yours too. 05-02-2009
HighDesert Benz Glad to hear the conversion is coming along. Is your new engine a 617.95X? I'd like to see the oil filter set up you're using when it's all done. That's the toughest part of putting a later model 617 in a 115 it seems. Your work on this is inspiring! 03-01-2009
Dusty-NZ Really nice car. I've got both 240D and 300d , done manual conversions to both. My 300D conversion has issues. I have to put softer compound engine mounts in. How's your progress? aside from the engine disassembly/rebuild you are having done, its really only 2 days work. I'd love to hear how it drives. 02-29-2008
diametricalbenz Still waiting on Metric Motors to do the crank balancing. The 240D is going in any day now. This project defines the word SLOW! 12-10-2007
HighDesert Benz Nice 115. I love 'em. Hows the conversion coming along? 12-09-2007
MBeige Can't wait to see this project completed!! 07-26-2007
Jim B. Whoa, that one looks beautiful, Carl. It's a real survivor, and a lovely color too. I like it!! 06-26-2007
JimmyL Could you PM me and tell me where you got the sheepskin covers. I like the look and fit. 02-05-2007
Colorado220 WOW!!! That is almost my twin!!! 12-06-2006
qdessa We had a 74 240D - the first MB for us. It was a blast to drive, sold it after two years of ownership. I still see it running around. 06-19-2006
KylePavao Awesome! Love to see a good W115! I love the pull knobs on the 240D's. 06-08-2006
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