Description

Mitsubishi Diamante Technical Manual – Factory Engine Specs for 6G72

If you have spent a Saturday afternoon chasing a coolant leak on a 6G72 because some aftermarket manual told you the intake manifold torque was 18 ft-lb instead of 22, you know the pain I am talking about. I have been turning wrenches in San Antonio for 28 years, and I keep a stack of OEM manuals on the back bench for a reason. This Mitsubishi Diamante Technical Manual is one of them. It runs 123 pages, covers only the 6G72 engine found in the Diamante from the early 1990s through 1998, and gives you the factory specs you need to walk away from a job without a callback. No fluff here – just the TSB revisions, torque tables, and assembly views that Mitsubishi sent to its own dealers.

Torque Specs: Page 19 is Your Safety Net

The first thing I look for in any manual is the torque table. Page 19 lists torque specifications for the entire engine – head bolts, main bearing caps, intake manifold, exhaust manifold, even the oil pump sprocket. If you use an aftermarket book, you might get a range like “22-26 N·m.” This manual gives you a single number, plus the tightening sequence and the angle for torque-to-yield bolts. I have seen too many stripped M8 threads because somebody guessed. Page 19 takes the guesswork out. The table is organized by component, with footnotes for sealant application where needed.

Timing Belt Procedures: SOHC and DOHC Coverage

The 6G72 came in both SOHC and DOHC configurations, and the timing belt job is different on each. Pages 48 to 57 walk through the removal, inspection, and installation for both. The manual shows the alignment marks clearly, including the hidden mark on the oil pump sprocket that a lot of DIY guys miss. I have had three cars in my shop this year where a home mechanic skipped the DOHC belt tension adjustment step and bent intake valves. Page 54 explains the pre‑load and the rotation sequence after belt installation. If you are doing a timing belt on a 6G72, you want these pages open, not a screenshot from a forum.

Special Tools on Page 24: Don’t Improvise

Page 24 lists every special tool Mitsubishi requires for engine work. Some of these – like the camshaft sprocket holder (tool number MD998719) – can be rented from the parts store, but you need to know you need it before you tear down. The manual tells you which jobs require which tool. I have made the mistake of using a strap wrench on the cam sprocket once. Never again. Page 24 also includes the flywheel holder and the oil seal installer sizes. Skip this page and you will waste time engineering your own rig that slips on the first attempt.

Intake Manifold Plenum and Throttle Body – Page 32

The intake plenum on the 6G72 is a common source of vacuum leaks, especially around the EGR passages. Page 32 starts the disassembly procedure, and page 37 covers the throttle body specifically. The manual shows the gasket orientation, the torque sequence for the plenum nuts (page 19 again), and the TPS adjustment range. I have seen aftermarket manuals tell you to “tighten in diagonals” with no order given. This manual lists the exact tightening pattern and the final torque in inch‑pounds. Follow it, and you will not warp the plenum or crack the plastic throttle body flange.

Generator and Drive Belt – Page 27

Page 27 covers the generator and drive belt removal and tension adjustment. The 6G72 uses a serpentine belt, and the tensioner requires a specific deflection measured with a belt tension gauge. The manual gives the deflection range for a used belt (0.20–0.28 in.) and a new belt (0.16–0.20 in.). If you just pull on the belt and guess, you will get a squeak or a thrown belt. Page 27 also shows the routing diagram with belt part numbers. I have a customer still driving a 1995 Diamante with the original alternator because we followed the factory procedure at 90k miles.

What Does the Sealant Section Cover? – Page 23

Page 23 is a one‑page reference that can save a lot of cleanup. It lists the exact Mitsubishi sealants – by part number – for oil pan, timing cover, water pump housing, and valve cover gaskets. It also tells you where to apply a 3mm bead versus a 5mm bead. The aftermarket sealant chart in the auto parts store is a joke compared to this. The manual also warns against using sealant on certain o‑ring grooves where only a dry install is acceptable. Page 23 is short, but it keeps oil leaks from cropping up two months after a rebuild.

Source Validity: OEM vs Aftermarket Documentation

This is a factory technical manual produced by Mitsubishi Motor Corporation. It is not a compilation from a third‑party publisher. Every specification, torque value, and diagnostic step comes from the original engineering team. I have compared a Haynes manual against this one for the 6G72 timing belt job. Haynes skipped the oil pump sprocket alignment step entirely. That is a $500 mistake if you put the head back on with the oil pump off a tooth. If you want to rely on something that the dealership service manager used, get this manual. If you want generic instructions, go ahead and buy the $15 book at the register. Your call.

Audience Fit: Who Needs This Manual?

If you own a 1993–1998 Mitsubishi Diamante and plan to do engine work yourself, you need this. It also covers the 6G72 in the Montero and truck variants (see page 4 for the sectional view), but the core engine specs are identical. Professional mechanics will appreciate the TSB references – the manual includes revision numbers like 7EN0323, which means you are getting the updated version, not some first‑ edition leftover. Home garage enthusiasts who want to replace a head gasket or rebuild the top end should not start without this open on the bench. Beginners: this manual assumes you know how to use a torque wrench. It does not explain what a torque wrench is. That is fine – you either have one or you are not ready for this job.

Related resources: Mitsubishi Diamante Service Manual – Factory OEM Specs for 6G72 covers the entire car, including body and suspension. Mitsubishi Eclipse 1994 Technical Manual – Factory Specs & Torque Data is useful if you work on the 4G63 platform. Mitsubishi Galant Technical Manual – MPI 4G63 DOHC Factory Specs complements this manual for drivetrain details. For background on automotive industry standards, see Automotive Industry Overview and Automotive Industry Overview.

Frequently Asked Questions

Does this manual cover the turbocharger section?

Yes, page 75 covers the turbocharger removal, inspection, and installation for the 6G72T.

How does this factory manual differ from aftermarket manuals I can find online?

Aftermarket manuals often summarize or skip steps. This Mitsubishi technical manual includes every TSB revision, every sealant part number, and the exact torque sequences that the factory engineers wrote. For example, the DOHC timing belt section (page 54) includes the factory tensioning procedure that aftermarket books either omit or get wrong. I have seen a popular aftermarket manual tell you to set the belt tension by feel – but the 6G72 requires a specific deflection measured with a gauge. The factory manual gives that number. It also lists the special tools required (page 24), so you know what to borrow before you start. If you want a job done without comebacks, this is the only source you should trust.

I have spent enough time on forums reading complaints from guys who snapped a head bolt because they trusted a one‑page torque chart from a generic website. This manual puts the whole engine procedure in your hands. 123 pages of workflows that start with “Drain the coolant” and end with “Check for leaks.” Grab a copy, open it to page 19, and set that torque wrench to the spec Mitsubishi chose – not something you found on a forum at 2 AM. Access the Factory Manual and get the job done right.