Description

Jeep Cherokee, Comanche Service Manual (1984–1993) – Factory Specs on 336 Pages

You’ve got a Cherokee or Comanche that’s throwing codes or leaking oil. You look up aftermarket guides and they give you a torque spec that doesn’t match the factory bolt tension. That’s a blown head gasket waiting to happen. This Jeep Cherokee, Comanche Service Manual stops that guesswork cold. 336 pages of verified OEM procedures, not a condensed reprint. Every engine – four-cylinder, V6, inline six – gets its own chapter. Every system from cooling to chassis electrical is covered with the exact steps you’d follow on a shop lift.

Page 0-22 in the troubleshooting section will shortcut a diagnosis that would take you two hours of chasing wires. The manual doesn’t skip the cylinder head torque sequence or the bearing clearances for the connecting rods. You get the whole picture, not a blurry snapshot.

Engine Overhaul: Four, V6, and Inline Six Coverage

Three separate chapters – 2A, 2B, 2C – cover each engine family. Chapter 2D pulls it all together with general overhaul procedures: ring gaps, main bearing torque, camshaft specs. If you’re rebuilding a 4.0L inline six, you go straight to Chapter 2C. The oil pump clearance specs are in there, not hidden in an appendix. Each engine’s torque values come from the same source Jeep used on the assembly line. That matters when you’re torquing head bolts in stages. No aftermarket manual gives you the step sequence this way.

What Torque Values Are Listed?

Every bolted joint that matters: cylinder head bolts, main bearing caps, connecting rods, flywheel, pressure plate, differential yoke nut. The manual lists them in inch-pounds and foot-pounds with tightening sequences. For the automatic transmission valve body, there’s a specific pattern you follow to avoid warping the casting. Page 7B-14 gives you the exact values. I’ve watched guys strip bellhousing bolts using generic specs – that doesn’t happen with this book in your hand.

7 Systems Covered Beyond the Engine

Cooling and HVAC – Chapter 3 covers the thermostat housing torque and the heater core removal sequence. Chapter 4 handles fuel and exhaust, including injector rail bolt specs. Engine electrical in Chapter 5 gives you the starter and alternator test procedures. Emissions and engine control (Chapter 6) has the sensor locations and diagnostic codes. Transmission is split into three: manual (7A), automatic (7B), and transfer case (7C). Brakes in Chapter 9 include caliper torque and bleed sequence. Suspension and steering (Chapter 10) has ball joint and tie rod torque values. Each system has a required tool list at the head of the chapter – no guessing what you need.

Chassis Electrical: Factory Wiring Diagrams

Chapter 12 runs from page 12-1 to wiring diagrams that start at 12-9. These aren’t generic schematics; they match the exact harness connectors used in the Cherokee and Comanche. You get the two-tone horn relay wiring, the headlight switch pinout, and the ground locations. The manual also tells you how to identify the vehicle using the VIN plate (left side of dashboard, driver’s side). That insurance from misidentifying a model year saves you ordering the wrong ECM. Check 1994-1996 Jeep Parts Catalog if you need later parts cross-references, but for the 84-93 models this is the one.

Audience Fit: The DIY Mechanic Who Needs Step-by-Step

You don’t need a lift to use this manual. Every procedure starts with a safety warning and a list of required tools. The tune-up routine in Chapter 1 walks you through fluid checks, belt tension, and spark plug gap specs. For the beginner, the intro pages explain vehicle identification numbers (page 0-8) and buying parts (page 0-10). For the home-garage enthusiast, the troubleshooting section at page 0-22 is a quick-reference to isolate engine, transmission, or electrical faults. I’ve used it on a 1989 Comanche with the carbureted 2.5L and a 1992 Cherokee with the fuel-injected 4.0L – the procedure didn’t change because the manual is year-specific.

Source Validity – OEM vs Aftermarket Documentation

This is a factory service manual, not a repackaged third-party guide. The specs were written by the same engineers who designed the vehicles. Aftermarket manuals often drop torque sequences or combine years incorrectly. This one covers 1984 through 1993 without merging incompatible data. Each engine section has its own table of contents. I’ve seen too many stripped threads from using a generic spec on a dissimilar joint. For understanding the manual transmission design, refer to Manual Transmission for background on the AX-15 and Peugeot units. For broader industry context, see Automotive Industry Overview.

Related manuals you might need alongside this one: Jeep Wrangler Cherokee Grand Cherokee 1991-1993 Parts Catalog for cross-model parts compatibility, and Jeep Cherokee Parts Catalog – Front Suspension if you’re refreshing the steering linkage.

Does this manual cover the 2.5L four-cylinder engine?

Yes, Chapter 2A covers the 2.5L four-cylinder engine completely.

Are torque specs included for the rear differential?

Chapter 8 covers clutch and drivetrain, including pinion and ring gear torque for the Dana axles. The specs are given in foot-pounds with preload targets.

What about the transfer case?

Chapter 7C covers the NP207, NP231, and NP242 transfer cases. Includes shift linkage adjustment, gear ratios, and seal replacement torque.

Can I use this for a 1990 Comanche?

Yes, the manual spans 1984-1993. Your 1990 Comanche is covered. Cross-reference the VIN from page 0-8 to confirm engine and transmission. The wiring diagrams in Chapter 12 correspond to late-run models as well.

You’re done wasting time on vague instructions. This manual sits on my bench every time a Cherokee or Comanche rolls in. 336 pages, factory data, no shortcuts. Access the Factory Manual and get the job done right.