Komatsu Engine Seal 6684-91-1521

Komatsu Engine Seal 6684-91-1521 is a Komatsu engine replacement part listed by 19PARTS for engine-section lookup, hub navigation, and part-number verification.

Product overview

Part number 6684-91-1521 is listed as Seal. Search also by the no-dash alternate number 6684911521.

Engine book references

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

• ENGINES / S6D155-4J S/N 22144-UP / ACCESSORY / AIR COMPRESSOR (611)
• ENGINES / S6D155-4J S/N 22144-UP / TOOL AND KIT / GASKET KIT (991)
• ENGINES / S6D170-1A S/N 10025-UP (Komatsu eng. Installed) / ACCESSORY / AIR COMPRESSOR (611)
• ENGINES / S6D170-1A S/N 10025-UP (Komatsu eng. Installed) / TOOL AND KIT / GASKET KIT (991)
• ENGINES / S6D170-1A S/N 10025-UP / ACCESSORY / AIR COMPRESSOR (611)
• ENGINES / S6D170-1A S/N 10025-UP / TOOL AND KIT / GASKET KIT (991)

This part appears in 14 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.