Komatsu Engine Plate 6643-21-4731

Komatsu Engine Plate 6643-21-4731 is a Komatsu engine replacement part listed by 19PARTS for engine-section lookup, hub navigation, and part-number verification.

Product overview

Part number 6643-21-4731 is listed as Plate. Search also by the no-dash alternate number 6643214731.

Engine book references

This part appears in Komatsu engine parts book paths such as:

• ENGINES / S4D155-4 S/N 10287-50040 / CYLINDER BLOCK / FLYWHEEL AND HOUSING(#10287-) (221)
• ENGINES / S4D155-4 S/N 10287-50040 / TOOL AND KIT / KIT(#10287-) (991)
• ENGINES / S6D155-4-R S/N 10014-UP / CYLINDER BLOCK / FLYWHEEL AND FLYWHEEL HOUSING(#30551-) (207)
• ENGINES / S6D155-4-R S/N 10014-UP / ENGINE KIT / GASKET KIT(#56577-) (991)
• ENGINES / S6D155-4A S/N 10014-UP / CYLINDER BLOCK / FLYWHEEL¤ POWER TAKE OFF AND FLYWHEEL HOUSING (1221)
• ENGINES / S6D155-4A S/N 10014-UP / TOOL AND KIT / GASKET KIT(#10014-19999) (9991)

This part appears in 32 Komatsu engine book paths in our reference data.

Verification note

Always confirm final fitment by engine model, serial range, diagram callout, and part number before ordering. Hub references are provided to help buyers find the right engine section and related parts faster.

Keep Ops Moving

19PARTS organizes Komatsu engine parts around searchable engine-model hubs so rebuild shops, equipment owners, and fleet teams can identify parts and keep repairs moving.