Description

Sperry New Holland OM 401 Parts Catalog – Factory Parts Breakdown for the Mercedes-Benz Diesel

If you are tearing down an old Mercedes-Benz OM 401 diesel in a Sperry New Holland combine or industrial rig, the last thing you need is a mismatch between the part you hold and the hole it belongs in. I have seen guys order a crankshaft bearing set by guesswork, then lose a full day when the half-shells don’t match the block. That waste of time ends when you have the actual Sperry New Holland OM 401 Parts Catalog open on the bench. This is the same 39-page document Sperry New Holland issued for their service departments. It is not a reprint or a photocopy of a third-party summary. Every group – from crankcase to water pump – uses OEM exploded views with Sperry New Holland part numbers. If you want to bolt it together without hunting for a number that does not exist, this is the paper you need.

Crankshaft and Timing: Critical to Get Right

Group 4 covers the crankshaft assembly. You get the factory diagram for the crankshaft itself, the main bearings, thrust washers, and the seal package. The timing chain or gear train – Group 5 – follows right after. If you are replacing a cam gear or checking the injection pump drive, you see exactly which sprocket and keyway Sperry New Holland spec’d. No more blending part numbers from a generic automotive catalog. For the OM 401, the fuel injection pump timing matters down to the degree. The injection pump group (Group 6) and the fuel filter assembly (Group 7) give you the correct filter head and line routing. Believe me, I have seen a misidentified fuel return line cause a runaway on a test stand. Do not rely on a blurry internet photo.

Cylinder Head Gasket: Which Variant Is on Your Engine?

The cylinder head and cover group (Group 3) lists the head gasket, valve stem seals, and the rocker cover parts. Sperry New Holland used different gasket thicknesses depending on the piston protrusion. If you just order a generic gasket set, you may get the wrong compression height. This catalog shows the factory part number suffix that tells you the thickness. Group 1 (crankcase) includes the block dimensions and any service limits noted in the exploded view. Having these pages on hand when you order parts from the dealer means you speak their language – the same numbers they see on their own screens.

39 Pages of Factory Exploded Views – Not a Novel

This catalog runs 39 pages total, including the index on page 98. (Yes, the index is on page 98 of the PDF – the multi‑language section pushes the numbers around.) The table of contents covers 12 groups: Crankcase, Oil sump, Cylinder head and cover, Crankshaft, Timing, Injection pump, Fuel filter, Manifolds, Starting motor – Alternator, Oil pump, Oil filter, Waterpump. Each group lays out the assembly in exploded isometric view with a parts list table. Part number, description, quantity per engine. No extra fluff, no generic wiring diagrams. If you need to identify an oil pump pickup tube, Group 10 gives you the factory illustration. For the waterpump, Group 12 shows every bolt and gasket. That is the kind of detail that keeps a job moving when the parts counter is closed.

Source Validity: OEM vs Aftermarket – The Cost of Guessing

I have used enough aftermarket parts catalogs to know they sometimes drop a digit or combine two variants into one line. Sperry New Holland’s own Parts Catalog – issue 497023 – was printed in 1978 by the division of Sperry N.V. in Zedelgem, Belgium. It is the original source for the OM 401/900.001 engine. The part numbers here are what the factory stamped on the boxes. Aftermarket catalogs might list a “universal” bearing that fits, but they will not tell you whether it matches the factory clearance spec. With OEM exploded views, you confirm the exact cage design and width. For the crankshaft main bearings, that matters when the block has been align‑bored. Do yourself a favor and compare your current part against these pages before you order a replacement. You can also check related manuals like Sperry New Holland OM 352 Parts Catalog – 48 Pages of Factory Parts Data for similar engines, or Sperry New Holland OM 352 Engine Parts Catalog for a different displacement. If you need parts for the six‑cylinder version, see Sperry New Holland OM 402 Engine Parts Catalog. For a wider view of the industry, see Automotive Industry Overview. Another reference: Automotive Industry Overview.

Audience Fit – Who Needs This Catalog on the Bench

If you work on farm equipment, or you have a Sperry New Holland baler or harvester with the OM 401 engine, this catalog is for you. The same applies to industrial power units using that Mercedes‑Benz block. Because it is a parts catalog, not a service manual, it does not include torque specs or repair procedures. What it does give you is the exact part number for every nut, seal, gasket, and pump in the engine. For the home garage mechanic who is rebuilding an old combine engine, that is gold. You do not want to pull the injection pump, find a leaky O‑ring, and have no idea what size to order. Group 6 shows it. For the professional shop, it cuts down the time spent cross‑referencing. You can hand the parts list to your counter guy and he pulls the right box.

Does this catalog include torque specs or repair instructions?

No. This is a parts catalog – it lists part numbers and exploded views only.

How do I know which part number fits my specific engine serial number?

The catalog is based on the OM 401/900.001 engine. Sperry New Holland used a consistent parts architecture across this model, but earlier or later variants may have minor differences. The exploded views show the factory assembly as of issue 497023. If your engine has been rebuilt with non‑OEM parts, you must compare the physical component to the diagram. The index on page 98 helps you locate any group quickly. For engines outside the 900.001 serial range, cross‑check by measuring the part against the OEM numbers listed – the catalog gives you the Sperry New Holland reference so you or your dealer can verify supersessions.

You can get the exact part number for your crankshaft, cylinder head, fuel injection pump, or waterpump from this catalog. Access the Factory Manual and put it on your tablet or print the pages you need for the job. No guesswork, no ordering the wrong seal on a Saturday afternoon.