Volvo Penta 280, 280-DP, 285, 290, 290-DP, SP-A, SP-C, DP-A, DP-B, DP-C Sterndrive Workshop Manual (OEM)

• 180-page original OEM workshop manual for Volvo Penta 280, 285, and 290 series sterndrives (B, C, and 20 drives).
• Covers all Single Prop (SP) and Duoprop (DP) variants from the mid-1980s through the DP-C1 generation.
• Features 124 exploded-view diagrams and 8 electrical wiring schematics for accurate part identification.
• Details three distinct shift mechanism configurations and specialized gear-shim adjustment procedures.

Component Overhaul and Mechanical Specifications

This factory publication outlines the exact sequences required to service the upper gear housing, intermediate housing, and lower gear unit. Technicians will find detailed teardown and assembly pathways. Specific sections address universal joint maintenance, steering spindle service, and the three distinct shift mechanism types. Accurate gear backlash measurement is critical for drive longevity. The text explains how to calculate required shim thickness using stamped factory markings, covering both fixed-dimension and variable-shim gear setups. Proper procedures ensure reliable operation, so always adhere to factory torque specifications and safety protocols when handling heavy marine drivetrain components.

Technical Data Preview

The manual documents essential specifications across multiple sterndrive generations. You get exact fluid capacities, noting 2.6 liters for standard lower gear housings and 2.7 liters for DP variants. Fastener specifications are explicitly stated. For instance, the pinion nut requires a tightening torque of 160 Nm (118 lb-ft), while the propeller shaft bearing housing calls for 40 Nm (29.5 lb-ft). The factory limits the maximum allowable steering angle to 30 degrees across all models. Additionally, the guide includes reference values for shift adjustments alongside complete wiring diagrams for power trim and tilt circuits.