Description

Andoria 4C90, 4CT90 1998 Parts Catalog – OEM Part Numbers for Diesel Engine Rebuilds

Mike Callahan here. If you’ve ever bolted on an aftermarket alternator only to find the mounting holes don’t line up, you know the cost of guessing. This Andoria 4C90, 4CT90 1998 Parts Catalog is the factory document – not a translation, not a reprint. It’s what I keep in the shop when I need the exact part number for a 4C90 or 4CT90 diesel. 53 pages of exploded diagrams, callouts, and OEM reference numbers. No fluff, no generic cross-reference that might be wrong. You want the part that fits the first time? Start here.

Alternator Assembly (A124-55d) – Exact Part Callouts

Page 1 of this catalog breaks down the alternator assembly (A124-55d). Every component – from the rear diode plate (part 779057774) to the screw M4x (part 782015258) – is listed with the OEM number and quantity. If you’re rebuilding your charging system, you don’t need to hunt through a parts store database. Flip to page 1, order the factory diode with negative pole (769896106), and move on. That saves you a trip and a headache.

53 Pages of Factory Part Numbers – What’s Inside

This Parts Catalog covers the complete Andoria 4C90 and 4CT90 engine families. Inside you get part numbers for the cylinder head assembly, pistons and rings, main bearings, fuel injection pump, injectors, water pump, oil pump, gasket sets, and fasteners. Each page uses the same format: exploded view with reference numbers, followed by a table like the one at page 1. The 1998 publication date means it matches the production specs for engines built around that year. Aftermarket catalogs often skip the injection system parts – this one doesn’t.

For the DIY Mechanic: Using This Catalog with the Service Manual

If you’re rebuilding an Andoria 4C90 at home, you need two things: a service manual with torque specs and this parts catalog. The service manual tells you how to disassemble and reassemble; the parts catalog tells you which part number to order. Don’t rely on online listings that claim “fits 4C90” without verification. Use the OEM number from this catalog and call your supplier. It’ll save you from buying the wrong piston diameter or the incorrect injector tip. Pair it with Massey-Harris-Ferguson FF 30 GS 1957 Parts Catalog | OEM Fastener Guide”>Massey-Harris-Ferguson FF 30 GS 1957 Parts Catalog if you’re working on vintage equipment – different engine, same principle.

Three Reasons to Choose OEM Documentation Over Aftermarket

First, accuracy. Aftermarket catalogs often use blurry photos or generic part numbers that cross-reference to multiple makes. This catalog uses original Andoria drawings with precise callouts. Second, completeness. The 4CT90 turbo variant has different oil lines and gaskets – the aftermarket sometimes lumps both into one vague listing. Third, traceability. Factory catalogs include revision dates and superseded part numbers. You can confirm your part is current. For another example of factory-level data, see Futura FC200-FC400 Parts Catalog.

Source Authenticity: Factory Print, Not a Third-Party Scan

This PDF is a direct scan of the 1998 factory print. Not a photocopy of a photocopy, not a re-typed table with typos. The OCR excerpt you see on the product page – the one with the Czech column headers and exact part numbers like 769894006 for the alternator assembly – comes straight from the original. If you want to learn more about diesel engine fundamentals, check this Wikipedia article on diesel engines. But for parts, stick with OEM print. For another precision catalog, browse Longagribusiness 410 DTC Parts Catalog.

FAQ – Andoria 4C90, 4CT90 Parts Catalog

Does this catalog cover both the 4C90 and 4CT90 engines?

Yes. Both natural and turbo variants are included.

What format does the manual come in?

PDF, 53 pages, black and white scans. You get the exact same layout as the printed factory catalog – table rows, exploded views, and part number columns. No searchable text, but the images are clear enough to read every line.

Can I use this to find torque specs?

No. This is a parts catalog only. Torque values are in the service manual.

The alternator part number on page 1 – is it the same for my 4CT90 with AC?

Page 1 lists alternator assembly A124-55d (part 769894006) as a subassembly that includes the pulley (items 1+43). The table shows that for the basic model (version “s”). If your 4CT90 has an air-conditioning compressor bracket that interferes, you may need a different alternator subassembly – the catalog includes alternator variants later in the document. Check the “Option” column: if no alternative is listed for your engine code, this is the default part. Cross-reference your engine serial number with the OEM supersession notes – the catalog includes date-stamped revision lines after the part table. For instance, if your engine was built after 1998.01.05, the alternator may have been superseded. You’ll see a “DO” and “OD” column on page 1 that shows valid-from and valid-to dates. Verify before ordering.

Stop wasting time with mismatched parts and vague online listings. Access the Factory Manual and get the exact OEM numbers you need to rebuild your Andoria 4C90 or 4CT90 engine right. One PDF, 53 pages, no guesswork. For further reading on diesel engine architecture, also see this Wikipedia article on diesel engines.