1W-8922 1W8922 PISTON RING KIT CAT 3406 3408 3412 for Excavator Engine Parts

The piston ring kit 1W-8922 1W8922 is the ring set for one piston on the CAT 3406, 3408 and 3412 diesel engine family, the power units behind excavators, wheel loaders, motor graders, track-type tractors, marine engines and generator sets. Once an engine in quarry, mining or earthmoving duty starts burning oil and losing compression, replacing the worn set with a new 1W-8922 kit restores cylinder pressure and cuts blow-by at far lower cost than a full short block.

This page also lists the companion CAT part numbers that are normally ordered together with the 1W8922 ring kit for the same 3406, 3408 and 3412 overhaul, so a workshop can build one complete parts list instead of chasing references one by one.

• Top compression ring in chrome plated cast iron, face ground to a precise profile so combustion pressure is sealed at high load and high temperature.
• Second compression ring with a taper faced section that scrapes the bore clean and supports oil control on the downward stroke.
• Oil control ring with a stainless steel expander spring, sized to return oil to the sump instead of letting it pass into the combustion chamber.
• The three rings in the 1W-8922 1W8922 kit are matched as one set, so ring end gaps stay consistent across the piston and no mixed production batches enter the engine.
• Each kit is packed and labelled as a single unit, which keeps parts room picking simple when several 3406, 3408 or 3412 engines are serviced at the same time.

Because all three engines share the same 137.2 mm bore family, one 1W-8922 1W8922 stock line serves a mixed fleet of 3406, 3408 and 3412 machines. Distributors who keep both number formats 1W-8922 and 1W8922 in their catalogue never lose a customer search to a dash.

The references below are the CAT numbers most often requested together with the 1W8922 ring kit during a 3406, 3408 or 3412 top end or full overhaul. Each number is written in both catalogue formats, with and without the dash, so it can be matched against either an old invoice or a parts book.

When a 3406 comes in for a top end job, the usual basket is the ring kit 1W-8922 1W8922 together with gasket kit 160-9874 1609874 and rod bearings 328-5574 3285574. For a 3408 or 3412 that also needs bottom end attention, add bearings 7M7219 and seals 142-5867 1425867, then finish with the water side parts 359-1439 3591439 and 3N4859.

1. Record the engine model and the reference on the old ring set, then confirm the bore size before ordering the 1W8922 kit in standard or oversize.
2. Strip and clean the piston, check groove width and side clearance against the workshop manual.
3. De glaze or re hone the bore, then check taper and ovality so the new rings can seat properly.
4. Fit the oil control ring first, then the second compression ring and finally the chrome top ring, keeping the marked side facing up.
5. Stagger the ring end gaps around the piston, lubricate with clean engine oil and fit the assembly with a ring compressor.
6. Torque the rod bearings 3285574 to specification, refit the cylinder head with a new gasket 1609874 and prime the oil system before start up.
7. Run the engine at light load first, then re check blow-by and oil pressure after the break in period.

• Compression recovery - the chrome plated top ring seats quickly against a re honed bore and brings cylinder pressure back into the working range expected from a rebuilt 3406, 3408 or 3412 engine.
• Oil consumption control - the expander spring behind the oil control ring holds steady radial pressure, so oil use stays stable across long service intervals.
• Heat resistance - cast iron bodies and chrome facing keep their shape under continuous high load operation in mining and quarry duty.
• Wear resistance - phosphate coating on the second ring improves running in behaviour and lowers the risk of scuffing when the machine goes straight back to work.
• Installation friendly - correct end gap and groove clearance out of the box, no hand filing needed in most standard bore rebuilds.

1. Raw castings are checked for hardness and microstructure before machining starts.
2. Ring face profile, radial thickness and end gap are measured against the original 1W-8922 1W8922 specification on every production batch.
3. Chrome layer thickness on the top ring is verified to confirm the wear life expected in excavator service.
4. Groove clearance and light tightness are spot checked before the set is released to packing.
5. Every finished kit carries a batch code, so any claim can be traced back to its production run.

We supply importers, parts wholesalers, fleet maintenance companies and engine rebuild workshops rather than end users. Regular container and consolidated air shipments leave for Australia, Canada, Chile, Zambia, Congo, Nigeria, Ghana, Tanzania, Indonesia, Thailand, Malaysia, Zimbabwe, Brazil, South Africa, Saudi Arabia, Mozambique, Peru, Argentina, Vietnam and Kenya, where 3406, 3408 and 3412 machines still carry a large share of the mining, quarry and earthmoving fleet.

• Mixed orders are welcome - piston ring kits 1W-8922 1W8922, gasket kits 160-9874 1609874, bearings 328-5574 3285574 and seals 1422329 can share one order and one set of documents.
• Neutral packing and buyer label marking are available for distributors who sell under their own brand.
• Cartons can be marked with your own reference so warehouse receiving and bin allocation stay simple.
• Repeat order history is kept by part number, so a restocking request can be quoted from the previous shipment.