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KMP Big-End Bearing Set T400937 (0.020" undersize)
The KMP Big-End Bearing Set T400937 (0.020" undersize) is a complete set of connecting-rod (big-end) shells under part number T400937, supplied by KMP Brand for diesel engine rebuilds.
About this part
Big-end shells carry the full firing load of each piston onto the crankshaft through a thin film of oil. Once that oil film is lost, wear accelerates quickly, so the shells are replaced as a set whenever the crank is ground or the engine is opened up for an overhaul.
When to replace it
- A deep knock under load that rises with engine speed
- Low oil pressure when the engine is hot
- Bronze or copper flakes in the drained oil or filter
- Scored or polished shells found during an inspection
Before you order
Plastigauge the running clearance on assembly, use fresh bolts where the engine maker calls for them, and prime the oil system before the first start.
Not sure it is the right one? A photo of the old part and the nameplate of the machine it came off is usually all the counter needs to confirm a match.
Questions
Do I need standard or undersize shells?
It depends on the crankshaft. A crank that has never been ground takes standard (STD) shells; a reground crank takes the undersize that matches the regrind. Measure the journal or ask the machine shop that did the work.
Should I replace main bearings at the same time?
If the engine is apart for a big-end failure, the mains have usually seen the same oil starvation. Most rebuilders do both.
Specifications
| Part number | T400937 |
|---|---|
| Brand | KMP Brand |
| Range | Big-End Bearing Sets |
| Size | 0.020" undersize |
Not sure it fits?
Send us the number on your old part, or a photo with the engine or alternator nameplate, and we'll confirm the match.
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