CATBearing & Bushing

4n3984 Bearing .020 — Cat 120g 130g

This is an undersized (0.020") main engine bearing designed to restore proper clearance in worn crankshaft journals. It is manufactured to meet stringent OEM specifications, ensuring durability and performance that surpasses a damaged or worn bearing. Operators may notice a significant increase in engine noise, particularly knocking or rattling sounds, and a potential loss of oil pressure if this bearing fails.

Bearing .020 – Part No 4n3984 – 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

1151651
Universal Joint Gp
5L1544
5L1545
8N7923
Bearing
9H3249
Bearing
2487857
Bearing
8r6282
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 TypeEngine Main Bearing
MaterialTri-metal overlay on steel backing
ApplicationEngine crankshaft main journal
Service LifeReplace as needed based on crankshaft wear
CompatibilityOEM specification
ConditionNew — OEM specification aftermarket

Failure Symptoms

Initial signs of failure may include a persistent knocking sound from the engine, especially under load. If left unaddressed, the bearing clearance will increase, leading to reduced oil pressure and potential engine overheating. Continued operation risks severe crankshaft and block damage.

Installation Tip

Ensure crankshaft journals are thoroughly cleaned and inspected for any burrs or imperfections before installation. Avoid using abrasive materials that could scratch the bearing surface or the journal.

Service Note

Always inspect the crankshaft journals for wear, scoring, and straightness, and consider replacing connecting rod bearings simultaneously.