Description

Komatsu 107E-1 Workshop Manual

If you’re working on a Komatsu 107E-1 and you reach for a generic manual, stop. You’re asking for trouble. Aftermarket documentation skips critical steps—like the standard tightening torque table on page 1 of this factory book. That table alone can save you a warped cylinder head or a snapped bolt. This is the real thing: 531 pages of Komatsu’s own shop manual, scanned from the original binder.

I’ve torqued more head bolts than most people have had hot meals. When I see a junior tech guessing on a CRI system pressure spec, I send them straight to this manual. It’s not about being fancy. It’s about having the exact OEM number the engineer wrote down. No aftermarket reprint, no third-party summary. This is the binder you’d find in a factory training room.

Structure, Function and Maintenance Standard

Open the manual to section 10. You’ll find separate subsections for the intake system, exhaust system, lubricating oil system, cooling system, fuel system, fuel supply pump, CRI system, turbocharger, cylinder head, cylinder block, crankshaft, pistons, connecting rods, vibration damper, timing gear, camshaft, valves, rocker arms, flywheel, oil pump, sensors, engine controller, and control system. Each one has the factory wear limits and assembly clearances. You don’t wonder—you measure and compare.

Testing and Adjusting: Air Boost Pressure and Valve Clearance

Section 30 is where the real work happens. It lists every special tool you need, with sketches—no guessing which adapter fits. Procedures for testing air boost pressure, adjusting valve clearance (cold, intake 0.30 mm, exhaust 0.45 mm from the standard value table), compression pressure, blow-by pressure, oil pressure, fuel system residual pressure release, CRI fuel pressure testing, reduced cylinder mode operation, fuel delivery and return leak testing, and air bleeding from the fuel circuit. You also get the high-voltage circuit handling steps. Page 3 shows the full index so you can jump straight to the job without flipping through 500 pages.

7 Sections That Cover Every Major Assembly

The manual is broken into seven numbered sections: 00 Index and foreword, 01 Specification, 10 Structure/function/maintenance standard, 20 Standard value table, 30 Testing and adjusting, 40 Troubleshooting, and 50 Disassembly and assembly. There’s also section 90 for repair and replacement of cylinder head and block parts. Each section is a book within the book, with its own table of contents. You get the engine performance curves, dimension tables, and the full error code table for the E-mode electrical troubleshooting system. That’s over 100 pages just on electrical diagnostic codes.

How the Standard Value Table Keeps You Out of Trouble

Section 20 is the standard service value table. It gives the run-in standard and performance test criteria. Want to know if your oil pressure is too low at idle? It’s right there. Need the injector timing offset range? Listed. This table is the final word before you decide to order parts. I’ve seen techs rebuild a perfectly good fuel pump because they didn’t have the delivery rate spec. Don’t be that guy.

Get the Right Torque Data – Not Aftermarket Guesses

The standard tightening torque table in the foreword (page 1) covers all the common bolt sizes and grades used on this engine. It’s a universal table for fasteners, but the manual also has specific torque values in the assembly sections—like the cylinder head bolts in the structure section. Every torque spec is from Komatsu, not a forum post. Use it or risk leaks, stripped threads, and broken parts.

FAQ: What You Need to Know Before Buying

Is this the official Komatsu workshop manual?

Yes. It’s the genuine factory document, part number SEN00161-19, with Komatsu’s own cover and binder format. 531 pages, scanned from the original.

Does this manual cover the transmission?

No. This is strictly the engine manual for the 107E-1. For instruction on a Manual Transmission, you’ll need a separate transmission manual.

What torque specs are included?

There’s a standard tightening torque table in the foreword covering bolt grades 4T through 12T, plus specific values throughout the assembly sections—cylinder head bolts, main bearing cap bolts, connecting rod bolts, and flywheel bolts. All given in imperial units: ft-lb and in-lb. The standard value table also lists test pressures and flow rates.

Can a beginner use this manual?

If you can read a torque wrench and follow a step-by-step procedure, yes. The manual assumes you have basic mechanical skill and the special tools listed in section 30. It tells you exactly how to measure, how to test, and what the pass/fail numbers are. It won’t hold your hand, but it won’t let you down either.

Torque specs? Page 1. Testing procedures? Page 3. OEM wiring diagrams? Spread throughout. This manual is the difference between fixing it right once and fixing it twice. Stop guessing. Access the Factory Manual from AutoRepairManuals and get back to work.

Related manuals you might need:
Komatsu 107E-1 Workshop Manual – 361 Pages of Factory Specs
Komatsu 107E-1 Workshop Manual – Factory Specs for the Engine Bay
Komatsu 107E-1 Workshop Manual – 382 Pages of Factory Specs

For general reference on manual transmissions: Manual Transmission