The Complete Guide to the Komatsu SAA6D102E Engine Series

Komatsu SAA6D102E (5.9L)

The Comprehensive Guide to the Industry's Most Reliable Mechanical Engine

Komatsu SAA6D102E Long Block Engine

Built on a Legend: The Cummins 5.9L DNA

The Komatsu SAA6D102E is a 5.88L (5.9L), six-cylinder diesel power plant co-developed through the Komatsu-Cummins joint venture. Sharing its core 12-valve architecture with the legendary industrial Cummins 6BTA 5.9L, this engine is renowned for its mechanical simplicity and reliability in Komatsu heavy equipment. Because it predates complex electronics and DPF/DEF emission systems, it remains a favorite for operators working in harsh environments. At Choate Engineering Performance, we remanufacture these engines to solve factory wear and thermal fatigue, ensuring your machine stays in the dirt and out of the shop.

5.9 LitersDisplacement
102mm x 120mmBore & Stroke
MechanicalFuel Delivery
StandardWastegate Turbo

Supported Equipment Models

Cross-reference your machine below. To ensure proper engine fitment, locate your specific Equipment Model Number before placing your order.

Excavators

  • PC200-6, PC200LC-6, PC210-6
  • PC220-6, PC220LC-6, PC250LC-6
  • PC200-7, PC200LC-7, PC210-7
  • PC220-7, PC220LC-7, PC230-7
  • PC240-7, PC270-7, PC228US-3

Wheel Loaders

  • WA200-3, WA250-3
  • WA320-3
  • WA200-5, WA200PT-5
  • WA250-5, WA250PT-5, WA250L-5
  • WA320-5, WA320PZ-5

Dozers & Specialty

  • D41E-6, D41P-6
  • D39EX-21, D39PX-21
  • D51EX-22, D51PX-22
  • D61EX-15, D61PX-15
  • GD555-3, GD655-3, GD675-3
  • BR380JG-1 (Mobile Crusher)
  • JV100A-2 (Vibratory Roller)
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Information Required When Ordering

To guarantee a 100% bolt-in match, please enter the following three items in the fields on the product page when ordering:

  • Equipment Model Number: Listed on the machine operator cab or frame (e.g., PC200-7, WA250-5).
  • Machine Serial Number: Stamped on the main metal data plate attached to the machine chassis.
  • Engine Serial Number (ESN): Located on the Engine Data Plate on the timing gear housing or valve cover.

Need help finding your serial tags? Call our technical sales team at 901-553-9847 and we will guide you right to them.

Machine Serial Number Location Diagrams

Komatsu Excavator

Excavator VIN# Location:

Same location as Case, Caterpillar and John Deere. The public stamping of the full VIN can be found on the front of the machine between the 2 hydraulic arms on a flat surface. Komatsu places a small decal bearing the word "Komatsu" over their stampings.

Serial Number Examples:

  • 6 Digits: A83462
  • 17 Digits: KMTHB001T03002436
Komatsu Wheel Loader

Wheel Loader VIN# Location:

Attached to right side (curb) on machine behind front fender. May also be found on right side under operators cab. Komatsu also stamps full VIN below plate in large stamps.

Serial Number Examples:

  • 5 to 6 Digits: A30112 or 53360
  • 17 Digits: KMTWA046K26051090
Komatsu Dozer

Dozer VIN# Location:

Left outside of cab behind door area. On some 2010-2013 machines, on the front left side of the engine cover plate. On older models, in the cab behind the driver's seat. VIN is stamped into rear of machine as shown by arrow along outer edge and may be covered by a black "Komatsu" decal.

Serial Number Examples:

  • 4, 5 or 7 Digits: 4581, G1030, P085567
  • 17 Digits: KMTHD030C29007641
  • 2014, 17 Digits: KMT0D122C01090489

Troubleshooting & Common Failures

Because the SAA6D102E is a fully mechanical 12-valve engine, diagnostics rely on symptoms rather than fault codes. Dealing with hard starts, low power, excessive smoke, or overheating? We've put together a technical guide to diagnosing the 5.9L platform.

READ THE TECH GUIDE

Stop Losing Money to Downtime

Our remanufactured long blocks feature CNC blueprinting, precision balancing, and upgraded internals to outlast OEM replacements.


View Upgraded Options

Or Call an Expert: 901-553-9847