So I have to ask this question. I bought a 240D way back (my first project) and everywhere I looked there was 240D's with Rod Knock. As to when it came to looking for a crank it was even harder to find. Again finding many many engines that were good but with cranks that had been turned once or multiple times. (as mine had been done a full 1.00mm over) As for 300Ds, have yet to find one with rod knock.

After months of looking I finally found a crankshaft that was standard (I already had the bearings and didn't want a turned one).

Anyway was rebuilding it last week and after getting them all on realized (my crankshaft NOT standard). It had been turned once over.

It was thought to be a standard crankshaft and I never checked it as I just assumed it was as I was told it was.

So I have a couple hypothesises

#1: Something seriously wrong with the metal/alloy they used in making the crankshafts for the 240D. Made millions of them and just didn't know until later down the road.

#2: The type of people who chose the 240D are nimrods and chose to run their oil forever/or completely out.

#3: Is it possible for the 240D firing pattern to put out more pressure on the journals. I know that they should have about the same compression rating as the 300D and shouldn't make a difference but just a thought.

#4: I've also noticed that the #1 and esp the #2 take the beating most of the time. This is what leads me to beleive it is more of an operator error problem in the 240's then then anything else (possibly to do with the location of the sump thus pulling dirty oil in that direction past those journals)


So am I just dreaming this up or is there something wrong here?

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76 300D 130K "Stella" (Sold )
74 240D 299K (Donated to Highschool For Senior Project WVO)
83 300TDT 290K (My one and only)
Sanford, NC