Cummins Parts

If you're rebuilding a Cummins engine or just replacing a worn filter, these Cummins parts give you about 165 listings to search, from engine gaskets and head bolts to air filters, starters and piston cooling nozzles. None of them come from Cummins itself. They're aftermarket replacements built for Cummins engines, and the make is in the listing so you know which engine the part is meant for.

The catalog leans toward engine hardware: 32 bolts, 26 gaskets and 15 air filters lead the list. The sections below cover each group, show how the part numbers are written, and explain what to try when a number doesn't turn up a match on the first search.

Cummins Parts by Type

Bolts and screws are the biggest group, followed by gaskets. Both are covered on the wider bolts, screws and studs and seals, gaskets and O-rings pages, which hold thousands of listings across all makes, so you can compare sizes if the Cummins one isn't an exact match. Filters come third, with 15 air filters on this page and the larger air filters collection behind them.

Smaller groups round out the engine: 4 valves, 4 bushings, 4 gears, 4 springs, 3 tappets, 2 piston ring sets, 2 piston cooling nozzles and 2 rocker arms. For a rebuild, the engine parts and overhaul kits page is the place to compare kits from other makes. On the electrical side there are 4 starters, three of them new units, one listed as "For Cummins Starter - New 3604654".

Cummins B Series and C Series Engine Parts

Many listings name the engine family as well as the make, which is the easiest way to narrow the search. "B Series" and "C Series" both appear, as in "FOR CUMMINS GEAR- STARTER RING- 173 TEETH CUMMINS B SERIES 3903309" and "FOR CUMMINS SPRING- VALVE 6C CUMMINS C SERIES 3906412". If your engine is one of these, add the series to your search along with the part name. A combined listing such as "FOR CUMMINS (PACK OF 4) TAPPET- B+C SERIES (3907240) J931623" covers both.

Some of these are sold in multiples, which is worth knowing before you compare per-piece cost. The cylinder head bolt in "FOR CUMMINS (PACK OF 14) BOLT- CYLINDER HEAD B SERIES CUMMINS B SERIES 3920780" is one example, and the piston cooling nozzle comes as a "PACK OF 12". Gaskets can be packs too, such as "FOR CUMMINS (PACK OF 5) GASKET 3937706". Read the quantity in the name before you add it to your order.

Other engine parts here include a connecting rod ("FOR CUMMINS CONNECTING ROD 4943979"), a water pump assembly ("FOR CUMMINS PUMP ASSEMBLY - WATER 3802081") and a camshaft bushing. Five listings also name Komatsu, such as "FOR KOMATSU FOR CUMMINS GASKET 6204111840", so check the Komatsu forklift parts page too if that's your machine.

Cummins Filters

Most filter listings carry short letter-and-digit codes instead of the long numbers you see elsewhere: 15 of the 23 air, fuel and hydraulic filters here read that way, while 8 use plain numbers. Air filters read like "REPLACEMENT AIR FILTER FOR CUMMINS AF4812", with other listings under AF493, AF355 and WF2133. Fuel and hydraulic filters follow the same style: "For Cummins Filter - Fuel FS19581" and "For Cummins Filter - Hydraulic HF6572".

Because these codes are short, an exact search works well. Type the whole code, letters included, rather than just the digits, so the search matches the listing as it's written.

Bolts, Screws, Nuts and Washers

Hardware accounts for a large share of the page. Besides the 32 bolts, there are 13 screws, 7 nuts and 5 washers, and the names carry the size: "For Cummins Screw - M8 20 HE FLANGE 8.8 390063000" and "For Cummins Gasket - M12 15.5 Copper 489138500". Hollow bolts and flange bolts both appear many times, such as "For Cummins Bolt - Hollow 390303500" and "For Cummins Bolt-Flange 390063300".

For fasteners outside this set, the nuts and washers and shims pages cover every make. Match the metric size and the grade number in the name, then the part number.

Reading Cummins Part Numbers

A Cummins number is usually seven digits, like 3920780 or 4983253. The same base number can show up written three ways, which is what makes searching tricky. The flange bolt appears as 390063300, as 3900633F and as C3900633. The M12 copper gasket appears as 489138500, 4891385F and C4891385.

The pattern is a letter prefix, a letter suffix or two extra zeros around the same seven digits. If your first search comes up empty, try the number with a C in front, an F on the end, and then with 00 added. Check that the description matches your old part before you order, since the listings alone don't prove that every variant is identical.

Browsing the Cummins Parts List

If you're looking for a Cummins parts catalog, the quickest route is by part type. Pick a group above, then add the engine series or the number to narrow it. This page works as a parts list for the Cummins items we carry. For bushings and gears from other makes, the bushings and transmission parts pages go wider.

Not every Cummins part is on the site. When yours isn't, try the full number first, then the shorter seven-digit version. We've been in this business since 2005, working from a warehouse in Franklin Park, Illinois, and parts that aren't listed are sometimes worth a second look under a different spelling.

Where Cummins Replacement Parts Wear

On an engine, the parts that see heat and pressure go first. Gaskets, filters and head bolts are the usual starting point, and starters give out when the engine cranks slowly or not at all. These are common-sense pairings from the part names in the listings, not a diagnosis. Compare the old part to the listing, and the number to the one stamped on it.

Cummins Parts FAQ

Are these genuine Cummins parts?

No. The listings are aftermarket parts made for Cummins engines. The Cummins name is there as a reference for matching.

Why does the same part have several numbers?

Listings for the same gasket or bolt can be written with a C prefix, an F suffix or two trailing zeros. Search each form until one comes up.

Can I buy a single bolt or only a pack?

Some listings are packs, such as 14 head bolts. The quantity is written in the name, so check it before ordering.

Does a Komatsu listing ever name Cummins?

Yes, five of them do. One is a rear crank seal for a Cummins C Series, so a Komatsu search can turn up engine parts too.

Where can I check your track record?

Look up ouroverstock on eBay, the name we've sold under since 2004. That account holds Top Rated Seller status and 99.9% positive feedback, and its sales history runs past 200,000 items.