Grey market 240D to 300d engine swap - Mercedes-Benz Forum

 
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post #1 of 9 (permalink) Old 07-16-2011, 12:50 PM Thread Starter
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Grey market 240D to 300d engine swap

Hi, I have a 1974 european MB taxi 240 diesel with a manual transmission. My friend is selling a low mileage 1975 300D. My taxi runs fine and I love how it's all mechanical (tranny, hand window cranks,etc) but I was wondering if the bolt pattern on the manual tranny will accept a 300D? I'm happy with my stock engine but it might be a good idea to have a spare. Anyone know if a 300d will bolt up to the 240D manual tranny??? Thx.Andy
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post #2 of 9 (permalink) Old 07-16-2011, 01:03 PM
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It should. The 300D is a 240 with an extra cylinder.
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post #3 of 9 (permalink) Old 07-17-2011, 12:14 AM
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Is the 300D a manual? or an automatic?
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post #4 of 9 (permalink) Old 07-17-2011, 12:35 PM Thread Starter
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The 300D is an automatic. Not sure if it will bolt up to the 240D manual tranny.Thx.Andy
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post #5 of 9 (permalink) Old 07-17-2011, 12:46 PM
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Only if you install a manual flywheel on the 300D engine and transfer the balance from the automatic flywheel to the manual flywheel (this is usually left to a machine shop).
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post #6 of 9 (permalink) Old 07-17-2011, 01:02 PM Thread Starter
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I assumed that I'd need a new flywheel for the 300d since it would have a torque converter. I was wondering if the bolt pattern to the manual tranny is the same on the 300d as the 240d. Now I'm wondering if I could even get a 300d flywheel. Weren't they all automatics in the US market? I suppose I could use the 240d's flywheel on the 300d if I couldn't find a flywheel for the 300d.Thx.Andy
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post #7 of 9 (permalink) Old 07-17-2011, 01:33 PM
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The bolt pattern should be no problem.

A lot of people use a 240D flywheel on a 300D when they convert to manual. Or you source a 300D flywheel from abroad, but there might be some in the USA too (from private imports for instance). The 300D flywheel is heavier.

The 300D has a key start-stop system, so you'll need some slight adjustments there too.

And if you want a 300D driving experience, a 300D differential is also needed (1:3.46 ratio).
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post #8 of 9 (permalink) Old 07-17-2011, 01:45 PM Thread Starter
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Thanks, that's really good news. I didn't want to make an adapter plate. I forgot about the pumpkin but that would be easy to swap out of the 300d donor vehicle. Guess I'll get that 300d. Thanks for all the replies.Andy
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post #9 of 9 (permalink) Old 07-17-2011, 02:19 PM Thread Starter
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Now you've got me thinking about diff ratios. Does anyone know what ratio the taxis used? I'm more interested in fuel economy than performance and it would make sense to me that the 300d had shorter gears (lower ratio) since it has more power. So if I put the 300d pumpkin behind the 240d, I should be able to get better mileage. I don't tow so I don't need pulling power. Does that sound right? Thx.Andy
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