Description

Mitsubishi Fuso FH Series 1991 Service Manual

I’ve pulled enough wrenches to know when a manual is worth the paper it’s printed on. The Mitsubishi Fuso FH Series 1991 Service Manual from the factory is that manual. If you’re working on an FH Series truck from 1991-95, you need the OEM specs — not some aftermarket reprint that guessed the torque values. This book is 1536 pages of factory procedures, torque tables, and diagnostic steps that save you from pulling your hair out when a bolt snaps.

What’s Inside the Mitsubishi Fuso FH Series 1991 Service Manual

This manual covers the entire truck from bumper to bumper. The group index on page 1 lists 25 groups from General (00) through Heater (55B). You get the engine group (11), fuel and engine control (13), cooling (14), intake and exhaust (15), engine electrical (16), clutch (21), manual transmission (22), automatic transmission (23), and so on. If you need to rebuild the rear axle, it’s in group 27. The manual layout on page 2 explains how groups are organized. This is the real thing, not a condensed version.

Engine Removal: Factory Sequence for Manual and Automatic Transmission

The engine group (11) dedicates separate sections for vehicles with manual transmission and automatic transmission. Each has its own service standards with tightening torque tables. The removal procedure is broken down into steps: preparation, harness removal, air compressor hoses, parts around engine, engine parts, transmission parts. Installation is the reverse but with specific torque values for each bolt. You won’t find this level of detail in a generic manual. The procedure for removing the Manual Transmission from the truck is covered in Group 22, with its own service standards.

Does This Manual Cover Torque Specifications?

Yes, and that’s where many aftermarket books fall short. Page 1 references the Standard Bolts and Nuts Tightening Torque Table in Group 00. The engine service standards give tightening torques for every fastener. Without OEM torque values, you risk warping heads or snapping bolts. This manual gives you the numbers Mitsubishi Fuso engineers specified. Don’t guess.

3 Systems You’ll Refer to Repeatedly

First, the Maintenance Schedule (Group 01) – it includes tables for periodic checks, oil changes, filter replacements, and lubrication intervals. Second, the Engine (Group 11) – removal, cylinder head, valve mechanism, pistons, crankshaft. Third, the Brake system (Group 35) – critical for safety. Each system has troubleshooting tables. The manual is 1536 pages thick for a reason: every component is documented. For more on the heater system, you might also check the Mitsubishi Fuso FE FG 1991 Service Manual – Section: Heater.

Understand the Maintenance Schedule Before You Start

Group 01 is not just a list of intervals. It shows how to read the tables, then details operations like replacing the engine oil filter element, adjusting V-belt tension, bleeding air from the fuel line, and inspecting the clutch pedal. Lubrication section (4) specifies engine oil, gear oil for manual transmission, automatic transmission fluid, rear axle gear oil, power steering fluid, brake fluid, and chassis grease points. Use the right fluid – this manual tells you which.

Group 00 – General: What the Foreword and Setup Tells You

Before you dive into repairs, Group 00 gives you external views, major specifications, power train table, performance curves (operation and engine), servicing precautions, towing precautions, chassis and engine numbers, and vehicle identification number. The foreword dated May 1991 warns that specs may change due to product improvements, so always check the latest bulletins. But this manual is the baseline. The cab group (42) covers removal and installation; see the Mitsubishi Fuso FK FM 1991 Service Manual – Section: Cab for related content. If you need to rebuild the Manual Transmission, Group 22 has the step-by-step disassembly.

Torque specs are non-negotiable.

FAQ

Is this manual for both manual and automatic transmission models?

Yes, Group 11 covers both transmission types separately.

How do I know this is the correct manual for my 1992 FH Series truck?

The manual covers model years 1991 through 1995, as indicated by the ’92-95 FH Service Manual’ title in the bookmarks. The Group 00 section includes model notation and vehicle identification numbers to cross-reference your specific chassis. If your truck is a 1992 FH, this manual applies. The 1536 pages include specifications for both manual and automatic transmissions, various engine configurations, and all chassis systems. Always verify your engine serial number against the data in the manual to confirm compatibility. If you have an older or newer year, check the supplement sections for minor changes – there are specific supplements for ’93, ’94, and ’95 minor changes. For older models, refer to the Mitsubishi Fuso FE FG 1990 Service Manual – Section: Heater if needed.

Stop wasting time on aftermarket guesswork. Access the Factory Manual from AutoRepairManuals and get the Mitsubishi Fuso FH Series 1991 Service Manual in your hands today. Your truck – and your sanity – will thank you.