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KMP Big-End Bearing Set 85043A (0.010" undersize)
Rebuilding the bottom end? 85043A is the KMP Brand con-rod bearing set, packed as a full engine set so every journal gets matching shells. This set is 0.010" undersize.
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.
Match the number stamped on the part you are removing, or the number in your engine or alternator manual, before ordering. Part numbers are shown for reference so the right replacement can be identified.
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 | 85043A |
|---|---|
| Brand | KMP Brand |
| Range | Big-End Bearing Sets |
| Size | 0.010" 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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