Main Crankshaft Bearing Set for Forklift Diesel Engines — Complete Overhaul Kit

This main bearing set provides a complete crankshaft bearing replacement solution for 2-3.5 ton diesel forklift engines, covering XinChai 490/4D27, Isuzu C240, QuanChai, and Dachai 498 engine platforms. The main bearings are the foundation of the entire engine rotating assembly, supporting the crankshaft within the cylinder block and absorbing the tremendous combustion and inertial forces generated with each power stroke. When main bearings degrade — signaled by dropping oil pressure, a deep rumbling knock from the lower engine, and visible metallic particles in the oil — the crankshaft loses proper alignment, causing accelerated wear on connecting rod bearings, piston skirts, and cylinder walls. Replacing the main bearing set during scheduled engine overhaul restores factory oil clearance, crankshaft stability, and overall engine reliability for thousands of additional operating hours.

Each bearing shell in this set utilizes tri-metal construction: a high-strength steel backing layer for structural support under extreme loads, a copper-lead intermediate layer for exceptional heat dissipation and fatigue resistance, and an aluminum-tin overlay for superior particle embeddability and conformability to minor crankshaft surface variations. Precision-machined to OE wall-thickness tolerances, the shells ensure correct hydrodynamic oil clearance without the need for line boring in most applications. Full-circumference oil grooves and spreader channels provide instant lubrication film formation on cold starts and maintain a complete oil wedge at all operating speeds, while calibrated crush height and spread dimensions guarantee secure, rotation-free installation in the block main bearing saddles.

Fits Heli CPCD20-CPCD35, Hangcha CPCD20-CPCD35, Lonking LG20D-LG35D, TCM FG/FD series, and Toyota/Komatsu 2-3.5 ton diesel forklifts using common engine platforms. Always confirm bearing size (STD, 0.25, or 0.50 oversize) against your crankshaft journal measurements before ordering, replace as a complete set, and follow engine manufacturer torque sequence and specifications during reassembly. Browse complete engine overhaul components in our forklift engine parts collection. Reference OEM specifications at Heli official website.

Technical Specifications

• SKU: MBSET
• Type: Complete Main Crankshaft Bearing Set
• Material: Tri-Metal — Steel Back / Copper-Lead / Aluminum-Tin Overlay
• Fitment: XinChai 490/4D27, Isuzu C240, QuanChai, Dachai 498 Engines
• Application: 2-3.5 Ton Diesel Forklifts
• Warranty: 12 Months

Compatible Forklift Brands

Kingstream main bearing sets are individually wrapped in VCI anti-corrosion paper and packed in rigid compartmentalized boxes preventing shell deformation during transit. Each batch is quality-inspected for wall thickness, crush height, and surface finish. 12-month warranty. Contact us for bulk pricing, engine overhaul kit quotations, or technical fitment verification.