Description

Mitsubishi Diamante Service Manual – Factory OEM Specs for the 6G72 Engine

You’ve been there. You’re staring at a 6G72 block, the aftermarket PDF says 55 ft-lbs for the main caps, but the bolt pattern feels off. Three foot-pounds difference can wipe out a crank journal. That’s because reprint houses pull specs from God knows where. Mitsubishi Diamante Service Manual is 122 pages of the exact data Mitsubishi issued for dealer techs. No condensation, no third-party “interpretation.” You get the torque tables, the sealant part numbers, the special tool list – everything a working mechanic needs to button this engine up right.

Torque Specs on Page 19 – The Backbone of a Good Rebuild

The torque chart on page 19 gives you the numbers that matter: cylinder head bolts (three-step sequence with angle), main bearing caps, connecting rod nuts, camshaft bearing caps. For the SOHC head, the sequence calls for 58 ft-lbs plus a 90-degree turn. Miss that final angle and you’ll be pulling the head again inside 500 miles. The manual also specifies a Mitsubishi sealant (part number in the book) for the timing cover bolts. I’ve seen RTV used there – that leaks within a week. Page 19 doesn’t let you guess. It prints the exact order and the exact compound.

Timing Belt Service – SOHC vs DOHC Differences

The manual splits the timing belt into two separate chapters: pages 48 for SOHC and 54 for DOHC. They look similar but the tensioner procedure is different. SOHC uses a spring-loaded auto tensioner; DOHC requires locking the camshafts with a special holding tool (listed on page 24). If you use the SOHC rotation method on a DOHC belt, it slips and you destroy valves. I’ve pulled three engines that died from exactly that mistake. The step-by-step instructions include alignment marks and rotation direction – no shortcuts.

Cylinder Head and Valves – Factory Procedure for SOHC and DOHC

Pages 91 and 98 walk through head removal, valve spring service, and installation for both cam configurations. The valve spring compressor tool (MD998420) is on page 24 – you must have it to avoid cracking a retainer. After the valve grind, the manual tells you to measure stem height. Skip that and the valve smacks the piston. I’ve seen three tow-ins this year from that oversight. This book also includes the tightening sequence for the head bolts, which changes between SOHC and DOHC. Don’t mix them up.

Special Tools and Sealant – Don’t Skip Page 23–24

Page 23 lists the required sealants: three different types for the oil pan, timing cover, and water pump housing. Using the wrong one causes leaks that are nearly impossible to trace. Page 24 gives you the special tool list: flywheel holder, cam sprocket puller, oil pump driver. You can’t seat the oil pump without the correct driver – the manual tells you which one. Aftermarket manuals often leave these out. This manual doesn’t.

3 Reasons to Stick with OEM Documentation for Your Diamante

First, the wiring diagrams in the ignition system section (page 44) are direct from Mitsubishi – no redrawn lines that disappear into the page. Second, the torque values on page 19 are tested on the actual 6G72. Third, the service specifications on page 14 give you oil capacity (4.5 quarts with filter), coolant volume (8.2 liters), and spark plug gap (1.0 mm). I’ve seen aftermarket reprints list 2.0 mm – that causes misfire. For a comparison of training standards used in professional shops, see the Automotive Industry Overview.

What This Manual Covers – Engine Mechanical Systems

The table of contents reads like a full engine overhaul checklist: General Information (page 2), Service Specifications (14), Torque Specifications (19), Sealant (23), Special Tools (24), Generator and Drive Belt (27), Intake Manifold Plenum and Throttle Body (32), Throttle Body (37), Ignition System (44), Timing Belt – SOHC (48) and DOHC (54), Intake Manifold and Fuel Parts (62), Exhaust Manifold (67), Turbocharger (75), Rocker Arms and Camshafts (77), Camshaft Rocker Arms and Bearing Caps (87), Cylinder Head and Valves – SOHC (91) and DOHC (98), Oil Pan and Oil Pump (102), Piston and Connecting Rod (108), Crankshaft Flywheel and Drive Plate (115), Bracket (122). Every section includes step-by-step procedures and the exact factory specs. If you’re rebuilding a 6G72, this is the only document you need.

Related manuals: Mitsubishi Diamante 6G7 Engine Technical Manual covers the broader 6G7 family. For the turbo variant, see Mitsubishi Dodge Stealth R/T Turbo 3000GT VR4 GTO Service Manual. For OBD-II wiring specifics, Mitsubishi Eclipse Spyder 1996 Service Manual – Factory Specs & Wiring shares similar diagnostics.

For further reference on automotive service literature quality, the Automotive Industry Overview outlines why OEM documents outperform aftermarket reprints.

Does this manual cover the 6G72 engine only?

Yes. It covers the 6G72 in SOHC and DOHC configurations.

What about transmission or body?

This is strictly the engine service manual – 122 pages focused on the 6G72. It includes the intake, exhaust, ignition, and engine mechanicals. It does not cover the transaxle, suspension, or electrical body systems. For those, you’ll need separate factory manuals. If you’re doing a full drivetrain rebuild, check the Mitsubishi Diamante 6G7 Engine Technical Manual which covers the 6G7 family. But for the engine itself, this is the one.

Are torque specs given in ft-lbs and Nm?

Both. Page 19 lists torque in Nm and ft-lbs. Also includes angle degrees where needed.

Can I use this for a 1995 Diamante?

If your 1995 Diamante has the 6G72 engine, yes. The manual covers both SOHC and DOHC variants. Check the year range – this is a generic service manual for the 6G72, commonly used in Diamantes from 1992 to 1996. Confirm your engine code on the firewall plate.

If you’re serious about getting the job done right on your Diamante’s 6G72, this is the only document you should trust. Don’t rely on photocopied reprints. Get the real thing. Access the Factory Manual now.