90-856159 Service Manual – Mariner/Mercury 15HP 4-Stroke

The Mariner/Mercury 15HP Service Manual (part number 90-856159) is the official factory reference for 4-stroke outboards with U.S. serial numbers 0G590000 and above. Published by Mercury Marine in December 1997, it delivers precise service information written by the engine’s original engineers.

This manual covers every key system: powerhead, oil pump, camshaft, lubrication, ignition, fuel delivery, and cooling. You’ll see exploded diagrams that clearly show each part, including the full oil pump and camshaft assembly. Torque specifications, gasket installation steps, and service data appear in easy-to-read tables for quick reference.

It also guides you through common maintenance jobs like timing belt replacement, oil pump servicing, and gear inspection. Troubleshooting charts lead you from diagnosis to repair without guesswork. Each procedure follows factory specifications, so you can restore performance and reliability with confidence.

The manual uses a clear, logical layout. You can move from inspection to reassembly in straightforward steps without losing your place. Because it’s printed on durable paper, it stands up to oil, grease, and frequent workshop handling.

Whether you’re a professional mechanic or a hands-on owner, the Mariner/Mercury 15HP Service Manual gives you the expert knowledge to keep your engine running at its best.

Arizona Outboard Dismantlers supplies only genuine factory manuals like this to help you protect your investment, extend engine life, and enjoy trouble-free boating season after season.