Komatsu SAA4D95LE-5-A 4D95 Cylinder Block 6204-21-1200 — Forklift/Excavator Diesel, R&E Brand, Japan OEM

This is the Komatsu SAA4D95LE-5-A (4D95) diesel engine cylinder block — the cast iron foundation of Komatsu’s legendary 95mm-bore 4-cylinder industrial diesel engine family that powered the D95 bulldozer series (1978-1986), Komatsu forklifts, and compact excavators for decades. Part number 6204-21-1200, this is the most structurally critical component in the entire engine. The cylinder block houses the four precision-bored 95mm cylinder bores (the 4D95 designation comes from this bore diameter), the line-bored crankshaft main bearing saddles (supporting the forged steel crankshaft at five main bearing positions), the camshaft bore for mechanical valve timing, the internal oil galleries that distribute pressurized lubrication to every rotating and sliding surface, and the water jacket cooling passages that circulate coolant to maintain the 82-95°C operating temperature under sustained full-load conditions. The 4D95 engine is a 4-stroke, 4-cylinder diesel with a reputation for extraordinary durability — these engines routinely exceed 20,000 operating hours before requiring major overhaul, making the cylinder block a critical long-term investment for any Komatsu equipment owner. A damaged block on a 4D95 most commonly results from freezing (insufficient antifreeze), overheating from coolant loss, or a catastrophic lower-end failure such as a thrown connecting rod.

This R&E brand block is manufactured in Japan (OEM specification) with standard sizing. New condition, cast iron material, 4-stroke diesel/4-cylinder configuration. 150 kg gross weight — this is a substantial industrial casting that requires proper lifting equipment for handling. Packing: neutral wooden box on pallet (78×78×68 cm), dispatched from Shanghai or Ningbo ports via sea or air shipping. 3-month warranty. Payment accepted by TT, Pay Later, Visa, or Mastercard. Supply capacity: 100 pieces per week. Engine code SAA4D95LE-5-A. Application: Komatsu forklifts and excavators with D95/4D95 engines. When installing a replacement cylinder block, all main and rod bearings must be replaced with new shells sized to the crankshaft journals (standard or undersized if the crank has been reground). Cylinder bores must be measured for out-of-round and taper — the 4D95 block uses wet cylinder liners, so liner bore condition and O-ring groove integrity must be verified before liner installation. The main bearing saddles require alignment checking with a precision straightedge — a misaligned bearing bore from a dropped or overheated block causes immediate bearing failure. The cylinder head deck must be measured for flatness across the full length — torch the deck bolts in the correct sequence to the factory torque specification.

Compatible with Komatsu D95 bulldozers (1978-1986), Komatsu forklifts using 4D95 diesel engines, and Komatsu compact excavators with SAA4D95LE-5-A engine code. Browse our cylinder block selection for Yanmar and Toyota platforms. For engine specifications, visit Komatsu official website.

Technical Specifications

Compatible Models

Japan OEM. Wooden crate. Sea/air shipping. Confirm your Komatsu model →