Cummins Bearings & Liners — part numbers

This is the largest category in the catalogue, at 668 numbers, covering main bearings, big-end bearings, thrust washers, cylinder liners, liner seals and the associated shims and locating hardware across every engine family we supply.

Almost everything here is an overhaul part rather than a service part, which changes what matters when ordering. The critical variable is size. Bearings come in standard and a series of undersizes; liners come in standard and oversize. If the engine has been overhauled before — and on the high-hour KTA and 855 units common in this region, most have — the sizes fitted last time determine what fits now, and the engine serial number will not tell you. Measure, or tell us what was fitted previously.

The second variable is the set. Bearings are supplied as sets for a reason, and mixing a new bearing into an old set on a large engine is a false economy that shows up as uneven wear within a few hundred hours. Where a number here is a single shell rather than a set, the description says so.

On tier, this category has a well-established branded aftermarket. Several manufacturers who supply original equipment bearings also sell under their own brand, and for many applications that is genuinely the same component in a different box. We will name the manufacturer on any Tier 2 line so you can judge it yourself. For liners specifically we lean toward genuine, because liner-to-block fit tolerances and the seal grooves are where aftermarket variation actually shows up in service.

For a quotation on overhaul parts we need the engine serial, the CPL, whether the block has been bored, and what sizes are currently fitted. Photographs of the old bearing shells with the markings visible are often faster than any of that.