CATBearing & Bushing

9Y9889 Piston Body — Cat Engine: 3406B

This is a piston body, a core component of an engine's combustion system responsible for converting the pressure from burning fuel into mechanical force. Manufactured to precise specifications, it ensures optimal sealing and heat transfer, unlike a worn piston body that may exhibit scoring or deformation. Operators might notice a loss of engine power, increased exhaust smoke, or rough engine running when this part is failing.

Piston Body – Part No 9Y9889 – CAT Spare Part
Part Specifications
BrandCAT
CategoryBearing & Bushing
ConditionAftermarket — OEM Specification
DispatchSame-day from Mumbai (before 3 PM IST)
GST InvoiceAvailable — all orders
Export DocsCommercial invoice, packing list, COO

Compatible Models

Always verify with serial number before ordering.

WhatsApp for Price & Availability☎ Call Mumbai Office

Parts Trading Company  ·  Mumbai, Est. 1956  ·  Same-day dispatch  ·  Ships worldwide  ·  GST invoice included

re 3 PM IST.', };

Related CAT Parts

From the same category — may also be needed

1W3906
Bearing
7W2136-020
Bearing
4F1727
Main Bearing (Rear)
1M1471
Guard Assem
3K0139
Bearing
9M8395
Bearing

Browse all CAT Bearing Bushing →

Installation & Application Notes

Never strike bearings directly — use a bearing press or driver set. Heat housing (not bearing) to ease installation. Replace bearings in sets where applicable. Check housing bore diameter before fitting — out-of-round bores destroy new bearings.

Always consult the OEM service manual for model-specific torque values and procedures. WhatsApp our technical team if you need fitment guidance.

Part TypePiston Body
MaterialAluminum alloy
ApplicationEngine combustion chamber
Service LifeReplace as part of engine overhaul
CompatibilityOEM specification
ConditionNew — OEM specification aftermarket

Failure Symptoms

Initial symptoms of a failing piston body include a noticeable decrease in engine power and increased blue or black exhaust smoke. If the condition worsens, the engine may begin to run rough, misfire, or consume excessive oil. Continued operation can lead to severe internal engine damage, including cylinder wall scoring and potential connecting rod failure.

Installation Tip

Ensure the cylinder bore is perfectly clean and lubricated with assembly oil before installing the piston. Always install new piston rings and verify correct ring gap and orientation as per the service manual.

Service Note

Replace piston rings, cylinder liners, connecting rod bearings, and all associated gaskets when installing a new piston body.