Mitsubishi Fuso FE, FG 1991 Service Manual

You know the drill: some aftermarket PDF claims it covers your Mitsubishi Fuso FE or FG, then you find the camshaft torque spec is off by 20 ft-lbs, and you’re chasing a leak you didn’t cause. That’s why I only trust factory documents. This Mitsubishi Fuso FE, FG 1991 Service Manual is the real deal – 1801 pages of OEM content, direct from Mitsubishi Fuso, printed in May 1991. It covers the Engine group, Camshaft changes, and everything else you need to keep these trucks on the road without making things worse.

Engine Group 11: Camshaft and Valve Mechanism

Group 11 is where the real work happens. The 1995 model changes section details seven updates to the engine, including a change of Camshaft bushing, tappet, and front oil seal. If you’re pulling the cylinder head, you need to know which piston and connecting rod revision applies – the manual spells it out by model year. Valve clearance specs, timing gear alignment, and the correct sealer for the timing gear case are all in there. I’ve seen enough backyard rebuilds fail because someone used the wrong sealant – don’t be that guy.

Why the 1995 Model Changes Section Matters

Mitsubishi Fuso issued running changes mid-production. This manual documents every one: from the injection pump inspection procedure using the MUT system to the exhaust brake circuit diagram modification. If you’re working on a ’94 or ’95 FE, the Groups 13 and 35 updates are crucial. The manual even lists the change of the power steering oil pump gear attaching nut – a 10-cent part that can cost you a pump if you miss it. Ignoring these bulletins is how you end up with a truck that won’t pass a safety inspection.

7 Groups Covering Everything from Fuel to Brakes

Groups 12 through 16 cover lubrication, fuel and engine control, cooling, intake/exhaust, and engine electrical. Group 12 shows the oil pump and filter changes; Group 13 includes the pre-stroke injection pump inspection. For the electrical guys, Group 16 details alternator and vacuum pump changes. Then Groups 22–23 cover Manual Transmission and automatic transmission rebuilds, including the special tool for main shaft removal. Group 35 brakes? You get the full exhaust brake valve and power chamber specs. No guesswork.

Get the Right Torque Specs – Group 00

Every bolt on these trucks has a factory torque value. Group 00 includes the Standard Bolts and Nuts Tightening Torque Table, performance curves, and servicing precautions. Need to know the wheel nut torque after a tire rotation? It’s right there. The manual also lists towing precautions and chassis/engine numbers so you can ID the exact variant. I keep a printed copy of that torque table in my toolbox – saves time when you’re under a deadline.

Heater and Air Conditioner: Group 55A and 55B

The 1995 model change includes a change of the air conditioner compressor. Group 55A covers the A/C system, Group 55B the heater. If you’re swapping a compressor or troubleshooting a blend door, you need the refrigerant capacities and line routing from this manual. Aftermarket wiring diagrams rarely match the actual harness colors – this one does. Also, check the related Mitsubishi Fuso FE FG 1990 Service Manual – Section: Heater for earlier model details, but for 1991-1995, this is the one.

Source Validity: OEM vs Aftermarket

This is a factory Mitsubishi Fuso document, not a third-party reprint. The sku is from the original print run. The 1801 pages include every group from General (00) through Heater (55B). I’ve compared aftermarket manuals that claim to cover the FE/FG – they leave out the FG-specific front axle details and the transfer gear oil specs. The OEM manual has separate sections for FE series (Group 26A) and FG series (Group 26B). That alone is worth the price of admission. For an owner’s perspective, see Mitsubishi Fuso FE, FG 2008 User Manual – Owner’s Operation Guide 363 Pages; for body builders, the Mitsubishi Fuso FE, FG 2007 Technical Manual – Body Builder’s Specs is useful, but for repairs, you want this service manual.

Does this manual cover the automatic transmission?

Yes, Group 23 covers it.

What about the camshaft replacement procedure in the 1995 model update?

Group 11 includes the change of Camshaft bushing, tappet, and front oil seal. The manual lists the revised parts and torque sequences for the timing gear. If your FE or FG was built after a certain engine number, you need to use the updated camshaft bushing. The manual gives the exact change point. I recommend checking the chassis number against the table in Group 00 first – saves you from ordering the wrong parts.

Every time I pull a head on a Mitsubishi Fuso, I have this PDF open on my tablet. The factory diagrams show the flow of the Manual Transmission oil circuit, the exact clearance for the disk brake pads (FE model only), and the brake shoe adjustment for the FG model. No fluff, no reprints – just the data you need. Download the Factory Manual and get the correct specs before you torque another bolt.