1987 Mercedes-Benz 190D, 300D, 300SDL, 300TD, 260E, 420SEL, and 560 series Service & Repair Manual (OEM)

• Covers 1983–1987 Mercedes-Benz diesel engines and automatic climate control systems, including the 190D, 300D, 300SDL, 300TD, 260E, 420SEL, and 560 series variants.
• Official Mitchell Repair Information Company publication (copyright 1998), featuring data current through the 1987 model year production range.
• Contains 23 technical diagrams detailing cylinder head tightening, timing chain components, vacuum routing, and electrical schematics.
• Details factory-authorized engine identification, mechanical assembly procedures, and HVAC specifications for the 300TD and related diesel platforms.

Engine Mechanical and Climate Control Systems

This documentation provides an in-depth review of engine assembly, timing chain procedures, and climate control diagnostics. It details engine identification codes specifically for the 2.5L and 3.0L diesel powerplants. Readers will find comprehensive sections covering camshaft bearing inspection, hydraulic valve tappet installation, and piston ring assembly. The manual thoroughly maps out the factory-recommended removal sequences for both the engine and transmission. It clarifies lifting procedures alongside component separation requirements. Beyond mechanical internals, the text explores the automatic A/C-heater system. It breaks down the push-button control panel, temperature sensors, auxiliary coolant pump, and vacuum-operated distribution doors. Note that working on heavy engine components and pressurized climate systems carries inherent risks; always verify equipment stabilization and depressurize lines before beginning any diagnostic work.

Technical Data and Inspection Guidelines

Specification tables document critical values for main and connecting rod bearings, valve springs, and cylinder head torque. The manual provides a standardized inspection guide for HVAC components. This helps determine exact conditions for the service or replacement of electrical actuators, vacuum lines, and expansion valves. Precise figures are included throughout the documentation. For example, main bearing caps require tightening to 65 ft. lbs. (90 N.m) according to the block assembly guide. Crankshaft front oil seal installation is documented using specific tool procedures to prevent costly component damage. Further technical data notes the intake valve head diameter at exactly 1.520 inches. You will also find that auxiliary coolant pump operation is mapped for the 300E model during heating mode cycles, and cooling fan motor high-speed activation is specified at 221°F (105°C).