![]() Intake valves are 40 mm in diameter, and the exhaust valves are 34 mm. The exhaust valve with a stellite-treated surface. The engine has OHV design with two valves per cylinder: one intake and exhaust made of special heat-resistant steel. It has high-quality cast iron camshaft, lobes are specially processed to improve hardness and durability. The SD25 has a one-piece high-strength cast iron cylinder head, special cast-iron valve inserts are shrink-fitted. Number of piston rings (compression / oil): ![]() Cylinder blockĢ1.4 (only for Datsun/Nissan 720 Pickup, Non-California)Ģ1.9 (only for Datsun/Nissan 720 Pickup, California) The cylinder bore is 89 mm, piston stroke is 100 mm. The Nissan SD25 motor has an aluminum alloy piston for high strength, lightweight and good heat conductivity two compression and single oil control ring, they are chrome-plated for long service life. Bearings are the precision type, steel-backed tri-metal shell. The SD25 engine has five main bearings, a drop-forged steel crankshaft with balance weights, all main and connecting rod bearing surfaces are induction-hardened. ![]() The cylinder block has a monoblock high-strength cast-iron structure with replaceable dry liners. ![]()
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