1999 Yamaha F40BMHD, F40WHD, F40BED, F40BET, F40ER, F40TR, F40MH Outboard Motor Service Manual (P/N LIT-18616-02-16)

This Yamaha F40B service manual covers F40BMHD/F40MH, F40BED/F40ER and F40BET/F40TR outboards with approval code 67C, plus F40BWHD. It is the September 1999 first edition, P/N LIT-18616-02-16, with document code 67C-28197-Z9-11.

Bookmarks and wiring detail: Embedded PDF bookmarks cover all nine chapters and many individual procedures. Page text is not searchable. Small wire-color codes and connector numbers in the denser harness diagrams require zooming.

• Power unit repair: Powerhead removal, cylinder-head and crankshaft disassembly, valve work, oil-pump inspection, timing-belt installation, and bearing-clearance checks.

• Fuel and controls: Carburetor disassembly and synchronization, fuel-pump service, float-height inspection, dash-pot adjustment, and shift/throttle cable settings.

• Lower unit: Water-pump and impeller replacement, propeller-shaft and geartrain repair, air-leak testing, gear shimming, and backlash adjustment.

• Bracket and trim: Tiller-handle and steering-arm service, MH/ER clamp brackets, TR power trim and tilt overhaul, and hydraulic bleeding.

• Electrical diagnosis: CDI unit, charge-coil and pulser-coil tests, starter-motor overhaul, charging-system checks, PrimeStart enrichment diagnosis, and variant-specific wiring diagrams.

• Service references: Maintenance interval charts, job instruction charts, exploded views, tightening torque tables, wear limits, fluid capacities, and electrical test specifications.

Written primarily for Yamaha dealers and their trained mechanics, the manual assumes an understanding of mechanical and electrical service procedures.

Carburetors and Running Problems

The fuel section includes the Hose Routing illustration, diaphragm fuel-pump inspection and separate exploded views for the carburetor unit and its internal parts. Synchronization and dash-pot sections address unstable idling and stalling during rapid deceleration.

Cleaning jets with steel wire can enlarge their passages and affect engine performance; the carburetor chapter flags this repair hazard.

Powerhead Repair and Cooling

Cylinder-head coverage extends to valve-guide replacement, valve-seat refacing, camshaft and rocker-arm inspection, and oil-pump rotor clearances. Crankshaft and piston sections include Plastigauge checks and bearing-selection tables for main and connecting-rod bearings.

Recoil-starter repair covers the rope, sheave drum and spiral spring. Flywheel removal procedures identify the universal puller YB-06117/90890-06521 and flywheel magnet assembly holder YB-06139/90890-06522. The stator assembly section documents timing-belt and sprocket installation.

Valve-clearance adjustment, thermostat operating tests, cooling-water checks, oil-pressure measurement and compression testing accompany the mechanical repair information.

Gearcase Shimming and Trim Hydraulics

The lower unit chapter separates Shimming (For USA and Canada) from Shimming (Except for USA and Canada), matching each method to its gauge equipment. Pinion, forward-gear and reverse-gear shim selection are followed by backlash checks. These separate procedures help you select the shimming method that matches your gauge set.

The air-leak test includes a specific warning that excess pressure can damage the lower-unit oil seals.

The bracket chapter distinguishes MH/ER shock-absorber arrangements from TR power trim and tilt. Tilt Cylinder Assembly exploded views support hydraulic disassembly, alongside gear-pump and pump-housing service, reservoir filling and bleeding.

Follow the manual's precautions for supporting a tilted outboard and handling pressurized trim components.

Wiring Variants and Fault Isolation

Separate Wire Harness drawings cover MH, ER 10-pin, ER 7-pin and TR configurations, with connector views and wire-color legends. Ignition Control System diagrams distinguish MH from ER/TR; charging, enrichment and trim circuits have their own diagrams and tests.

Peak-voltage testing specifies the YU-39991/90890-03169 adapter. The Trouble Analysis Chart links symptoms such as no-start, overheating and poor charging to relevant components and chapters; Trouble Shooting for Peak Voltage provides the ignition fault-isolation flowchart.

English PDF and Included Pages

The file contains black-and-white illustrations; no separate color fold-outs are included. This single, printable 253-page PDF includes 7 front-matter pages, 239 technical and chapter-introduction pages, 6 blank pages and 1 back cover, all counted in the total.