90-853985 Service Manual – Mercury/Mariner 30–40HP

Mercury 30–40HP Manual (90-853985) is the original factory guide for Mercury and Mariner 30 hp and 40 hp outboards. It delivers precise instructions straight from Mercury Marine engineers.

This Mercury 30–40HP Manual covers ignition, fuel delivery, cooling, carburetors, and lower unit repairs. It includes clear exploded diagrams and factory torque values to help you identify parts and tighten components correctly.

Use it to perform pump changes, gearcase service, idle adjustments, and troubleshooting. Each procedure walks you through removal, inspection, and reassembly with simple step-by-step directions.

This workshop-grade manual is ideal for both marine technicians and owners. It helps you perform professional repairs and keep your outboard performing at its best. Arizona Outboard Dismantlers offers authentic manuals like this to protect your investment and improve engine life.