Description

Mitsubishi Fuso FK, FM Service Manual – 1986-1987 Models

If you’re working on a Mitsubishi Fuso FK, FM Service Manual and you’re using generic aftermarket instructions, you’re wasting time and risking a blown head gasket. This 751-page factory manual gives you the exact torque values and procedures that Mitsubishi Fuso put in the hands of their dealers. I’ve seen too many guys guess on the head bolt torque and end up with a leak. That’s not happening with this on your bench.

Group 11 Engine – Complete Rebuild Specifications

The engine section covers the 6D14 and other powerplants used in these trucks. You’ll find the compression pressure measurement procedure, removal, disassembly, inspection, and reassembly steps. The service standard table lists every clearance and limit. And the tightening torque table – page 1 of Group 11’s service standards – gives you the exact ft-lb values for the cylinder head, main bearing caps, and connecting rods. No rounding up or down; factory spec only.

Maintenance Schedule: What’s Covered in Group 01

Group 01 is the maintenance schedule. It’s not a vague list of intervals; it’s step-by-step. You get replacement of oil filter element, fuel filter element, cleaning of the fuel feed pump gauze filter, and bleeding of the fuel system. V-belt tension adjustment, air cleaner element cleaning with separate procedures for dry dust buildup vs. oil smoke and soot deposits. Clutch pedal inspection includes pedal play and clearance to floorboard when released. Tire servicing covers inflation pressure, removal, installation, retightening wheel nuts, and rotation. Wheel brake shoe clearance adjustment has dedicated instructions for gear type on FK415 and FK455 and cam type on FM555. Parking brake shoe clearance, battery servicing (terminals, fluid level, specific gravity), fuse replacement. Then lubrication for engine, clutch, transmission, rear axle, brakes, and power steering. That’s the level of detail you need to keep a truck on the road.

Standard Bolts and Nuts Tightening Torque Table – Group 00

Group 00 contains the exterior views, major specifications, power train table, equipment model notation, operation performance curves, engine performance curves, servicing precautions, vehicle identification number, and the standard bolts and nuts tightening torque table. This table covers the common fastener sizes used throughout the truck. If you chase a replacement bolt and don’t have the factory torque, you’re guessing. Guessing on a wheel nut or a brake caliper bolt gets people hurt. Use this table. Page 2 of the manual shows the entire group index so you can find this table fast.

Why OEM Factory Documentation Beats Aftermarket Reprints

Aftermarket manuals often lift data from the factory original but miss key details – like the exact sealant type for the oil cooler housing or the special tool number for the injection pump timing pin. This manual is the original Mitsubishi Fuso document. The group classification on page 3 explains how the manual is organized so you can navigate efficiently. The troubleshooting sections in Group 11, 12, 13 give you diagnostic trees that aftermarket copies strip out. When the truck isn’t starting, you need the fuel system bleed procedure exactly as written – not a generic version. This is that document.

Audience Fit – Who Needs This Manual?

DIY mechanics will find this manual approachable because it starts with servicing precautions and defines terms. Fleet owners use it to train techs on the FK and FM series. Shop technicians like me rely on it for the torque specs and the engine overhaul procedure. One real-world case: you’re rebuilding the 6D14 engine. If you skip the oil pump inspection steps (Group 12), you’ll have bearing failure inside 10,000 miles. This manual shows the regulator valve and check valve disassembly for the 6D14T. For manual transmission service, refer to Manual Transmission specifications on Wikipedia. And the propeller shaft group also interacts with the Manual Transmission. For additional documentation, check the Mitsubishi Fuso FK FM 1991 Service Manual – Section: Cab for cab-specific repair info. The Mitsubishi Fuso FK, FM 2008 User Manual – OEM Owner’s Guide covers fluid types and capacities. Body builders will want the Mitsubishi Fuso FK, FM 2007 Technical Manual – OEM Body Builder Drawings for chassis dimensions.

FAQ

Does this manual cover the FM555 with cam-type brake adjusters?

Yes, section 2.10.2 in Group 01 covers it.

What is the compression pressure specification for the 6D14 engine?

The manual specifies the compression pressure measurement procedure in Group 11, section 4.1.1. You’ll need a compression gauge, warm engine, and to disable the fuel supply. The service standard table lists the nominal pressure and the minimum allowable. If the pressure is low in one cylinder, you’ll follow the inspection and correction section that covers valve clearance, piston rings, and head gasket. Without this factory data, you’d be guessing at the cause. The manual also includes the special tool numbers required for the compression test. That level of detail saves you from pulling the head unnecessarily when the problem might be something simpler like a stuck valve.

If you want to work on these trucks the way Mitsubishi Fuso intended, Access the Factory Manual from AutoRepairManuals. It’s the same binder that dealerships used.