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KMP Big-End Bearing Set T421658 (0.020" undersize)
Rebuilding the bottom end? T421658 is the KMP Brand con-rod bearing set, packed as a full engine set so every journal gets matching shells. This set is 0.020" undersize.
About this part
Every power stroke is transferred from the connecting rod to the crank through these shells. They are a wear part by design: softer than the crank so that the shells, not the crankshaft, take the damage when lubrication is poor.
When to replace it
- 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
- Any crankshaft regrind or bottom-end overhaul
Before you order
Measure the crank journals before ordering. Standard shells suit an unground crank; undersize sets (marked 0.010" / 0.25 mm and up) are for a crank that has been reground by that amount.
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.
Is this a complete engine set?
Bearing sets are packed per engine. Check the quantity against the number of cylinders when the set arrives, and call us if anything is missing.
Specifications
| Part number | T421658 |
|---|---|
| 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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