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400 Diesel engine woes

A

Anonymous-0

Well-known Member
I have a 400 gas start diesel. The engine has about 300 hours on it since a complete, out of frame, overhaul by me. My third one of these types of engines. Nothing was omitted during this event. Crank ground .010 over, reconditioned connecting rods, every known bearing replaced, new pistons and wrist pins, all parts boiled and thoroughly cleaned etc. It ran great with super oil pressue but now it has a knock. I have torn it apart to find that the wrist pin bushings have failed. The holes in the bushings appeared to have been properly aligned with the oil gallery in the connecting rod. I can see nothing that was assembled incorrectly.
I know this is a high wear area for this type of engine, over the long term, but does anyone have any ideas why these failed so prematurely?

Thanks in advance.
 
What was the source of the pin bushings?

Any chance they could have been for a gas engine rather than a diesel?

Or, maybe just poor materials.
 
I always make new ones and press them in . make the bore undersized and have them line honed to size at a automotive machine shop . do this and they will last.
 
I've never worked on one of these engines. I assume there must be an oil passage thru the connecting rod from the rod bearing? Is there a corresponding hole on the rod bearing to line up for oil to the wrist pin bushing? Just curious myself what would cause it to fail on you.
 
Were the bushings dry or wet with oil when you removed the rods from the pistons? Are the passages thru the rods clear, and, as Joe asked, were the upper rod bearings holed for the passage thru the rods? Mark
 
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