Description

Mitsubishi 4DQ50 Parts Catalog – OEM Factory Specs for Diesel Engine

If you’ve spent time hunting for the right part number on a Mitsubishi 4DQ50, you know the headache of aftermarket catalogs that list wrong supersessions or skip details. This Parts Catalog cuts that out. Direct from Mitsubishi Heavy Industries, it gives you the same exploded diagrams and part number tables the dealer uses. No third-party reprints. No condensed versions. 119 pages of factory data. You get the exact part number, quantity, and engine number applicability for every component on the 4DQ50 diesel.

Cylinder Head & Rocker Cover: What the Manual Covers

Page 2 opens with FIG. 1-01 – Cylinder Head & Rocker Cover. You see the cylinder head assembly with bolts, gaskets, valve guides, seat inserts, expansion plugs, and the rocker cover with its gasket and cap nuts. Every item has a key number, genuine Mitsubishi part number, name in English and Japanese, quantity, and engine number range. Need a cylinder head gasket? Part number 30601-52101. Head bolt? 30601-22800 (12 bolts) and 30401-02603 (5 bolts). The table even notes special studs for the exhaust manifold (F1450-08025) and combustion jet (30603-50100). No guesswork.

Does This Manual Cover the Entire Engine?

Yes. The catalog breaks the engine into numbered figures. FIG. 1-01 covers cylinder head and rocker cover. FIG. 1-02 (page 5) covers valve mechanism and camshaft – you get rocker arms, pushrods, camshaft gear, and associated hardware. Additional sections (not shown in the excerpt) include cylinder block, piston assembly, fuel injection pump, oil pan, and cooling system. Every figure follows the same layout: an exploded diagram, then a table with key, part number, name, quantity, engine number. If you’re rebuilding a 4DQ50 or sourcing individual parts, this manual gives you the factory reference.

3 Reasons to Choose OEM Documentation Over Aftermarket

• Part number accuracy – aftermarket catalogs often merge multiple engine versions into one generic list. This catalog separates by engine number (e.g., the cylinder head assy part 30601-51010 supersedes based on serial range).
• Exploded diagrams match what you see on the engine – you identify parts visually without guessing which bracket goes where.
• Factory quantity data – know exactly how many of each bolt, plug, or gasket you need before you order. Saves trips to the parts counter.

Get the Right Part Numbers the First Time

For example, the rocker cover gasket (30604-25200) is separate from the cap nut gaskets (30804-05700). Oil filler cap is 30642-25101. If you order from aftermarket lists, you might get a generic cap that doesn’t seal on the 4DQ50. The factory catalog shows the specific part. Also note the expansion plugs: one 25mm (09487-02500) and six 20mm (09487-02000) – those are common leak points on older diesels. With this catalog you order the correct ones.

Valve Mechanism & Camshaft: Factory Breakdown

Page 5 shows FIG. 1-02. You get the valve mechanism with rocker arms, pivot shafts, and camshaft components. The diagram lists parts like rocker arm adjusting screws, pushrods, cam followers, and timing gears. Each part has a key number referencing the table. If you’re reseating valves or replacing camshaft bearings, this is where you verify the camshaft part number against your engine number. No mixing up between early and late 4DQ50 builds.

Audience Fit: Who Needs This Catalog

DIY mechanics rebuilding a Mitsubishi 4DQ50 in a tractor, generator, or marine application. Small shop owners who want to order parts without relying on counter clerks who read aftermarket databases. Home garage enthusiasts who prefer to cross-reference part numbers rather than hope a gasket fits. If you own equipment powered by a 4DQ50, this catalog lets you source components from any Mitsubishi dealer or parts supplier with confidence that the number matches the part.

Source Validity: Why This Is Not an Aftermarket Reprint

This digital file comes from the original Mitsubishi Heavy Industries publication. The OCR excerpt on page 1 shows the Mitsubishi logo and FOR SAMOFA notation – a factory distribution mark. Every page carries the official part number format used by Mitsubishi. Aftermarket catalogs often renumber parts or omit engine number restrictions. This document preserves the factory layout, including Japanese text next to English for double verification. 119 pages, no condensation, no shortcuts. The same manual that dealer parts departments used when these engines were new.

Related Manuals

• Mitsubishi 4DQ50 4DQ50W Service Manual – 118 Pages Factory Specs”>
• Mitsubishi S3L2 2009 Parts Catalog – OEM Factory Specs”>
• Mitsubishi S6A3-PTA PTK 1991 Parts Catalog – Factory OEM Specs”>

For broader automotive standards, refer to Automotive Industry Overview”> and Automotive Battery”>.

Frequently Asked Questions

What engines does this parts catalog cover?

This catalog covers the Mitsubishi 4DQ50 diesel engine.

How many pages is the manual?

The manual contains 119 pages covering every part from cylinder head to valve mechanism, with factory part numbers, quantities, and engine number references. It includes exploded diagrams (like FIG. 1-01 for cylinder head and rocker cover, and FIG. 1-02 for valve mechanism and camshaft) and cross-references to OEM part numbers, eliminating guesswork when ordering replacement components. The documentation is direct from Mitsubishi Heavy Industries, not a third-party compilation. You get the same data used by dealer parts departments. Page 2 shows the cylinder head assembly with bolts, gaskets, valve guides, seat inserts, and expansion plugs. Page 5 covers the valve mechanism with rocker arms and camshaft. Every part number is listed in a table with key, part number, name, quantity, and engine number applicability.

Stop wasting time with aftermarket part number lists. Access the Factory Manual and start ordering the right parts today.