page_title: 4 VD 14,5/12-1 SRW
section_title: Crankshaft, pistons and cylinders
hierarchical_section_title: 4 VD 14,5/12-1 SRW / Technical description / Crankshaft, pistons and cylinders
caption_attribution_description: Deutsch: 4-Zylinder-Dieselmotor der ZT-300er-Reihe, M-Verfahren
context_page_description: The 4 VD 14,5/12-1 SRW is an inline four-cylinder diesel engine produced by the VEB IFA Motorenwerke Nordhausen from 1967 to 1990. The engine was one of the standard modular engines for agricultural and industrial use in the Comecon-countries. Approximately one million units were made.
context_section_description: The engine has a forged crankshaft, supported in changeable thin-wall bearing shells. The journals of the crankshaft and the connecting rods are polished and induction hardened. The counter-weights are screwed on the center and outer crank arms. The flywheel is connected to the power take-off side of the engine with screws. The gear drive side of the crankshaft is equipped with a gear, which drives the oil pump and the gear which drives the camshaft. The connecting rods are forged and weight-balanced. While the small connecting rod bore has a bearing pressed into the bore, the crank-sided bore of the connecting rod has a thin-wall bearing. For lubrication and cooling of the connecting rods they have small oil-ducts. Oil is pressed in the ducts from a nozzle at the upper side of the connecting rod. The piston journals are secured with two circlips and are bathed in oil. A heat resistant light-metal-alloy is used for the cast pistons. The combustion chamber is integrated into the piston. For compression, the pistons have two piston rings which slots are cast into the piston. The pistons are also equipped with an oil control ring. The cylinder liners are made of centrifugally cast iron, two rubber rings seal the liners off from the crankcase. The engine has two cast iron cylinder blocks with two cylinders; every block has a head, which makes two cylinder heads.
caption: 4 VD 14,5/12-1 SRW without cylinder head. Well visible piston with MAN-M-System combustion chamber.
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