STD Main Bearing Set for Forklift Diesel Engines — Standard Size Replacement

This STD (standard size) main bearing set is a complete crankshaft bearing kit designed for overhaul and rebuild applications on 2-3.5 ton diesel forklift engines. Main bearings are the primary load-carrying components between the engine block and the crankshaft, supporting the entire rotating assembly under extreme combustion pressures and high-RPM reciprocating loads. When main bearings reach their wear limit — typically indicated by dropping oil pressure, a deep lower-end knocking sound, and metallic debris in the oil — replacement with a quality STD-size bearing set restores proper oil clearance, crankshaft alignment, and engine reliability without requiring an undersize regrind of the crankshaft journals.

Manufactured from tri-metal composite materials, each bearing shell consists of a rigid steel backing for structural support, an intermediate copper-lead alloy layer for superior load distribution and heat transfer, and a precision-applied aluminum-tin overlay for excellent embeddability of microscopic wear particles and conformability to minor shaft irregularities. The bearing shells are precision-machined to OE-standard wall thickness with tight tolerances ensuring correct oil clearance for hydrodynamic lubrication. Integrated oil grooves and spreader channels ensure instant oil film formation on cold starts and maintain full lubrication at all operating speeds, while calibrated crush height and spread characteristics guarantee secure, rotation-free installation in the block saddles.

Suitable for XinChai 490/4D27, Isuzu C240, QuanChai, and other common forklift diesel engine platforms used in Heli CPCD20-CPCD35, Hangcha, Lonking, TCM, and Toyota 2-3.5 ton models. Always verify bearing size (STD / 0.25 / 0.50) against crankshaft journal measurements before ordering — standard size bearings are for crankshafts that have not been reground. Replace as a complete set and follow manufacturer torque specifications during assembly. Browse our complete engine parts range at forklift engine parts. For bearing selection guidance, refer to Heli official website.

Technical Specifications

• SKU: STDMBSET
• Size: STD (Standard) — Fits Crankshafts Not Reground
• Type: Complete Main Crankshaft Bearing Set
• Material: Tri-Metal — Steel Back / Copper-Lead / Aluminum-Tin Overlay
• Application: 2-3.5 Ton Diesel Forklifts (XinChai, Isuzu, QuanChai Engines)

Compatible Forklift Brands & Engines

Kingstream bearing sets are individually wrapped in VCI anti-corrosion paper and packed in rigid compartmentalized boxes to prevent shell deformation during transit. Each batch undergoes statistical quality inspection including wall thickness measurement, crush height testing, and surface finish verification. 12-month warranty. Contact us for bulk pricing, engine overhaul kit quotes, or technical fitment confirmation.