1978 Johnson 4HP outboards Service Manual, Page 6Get this manual
INTRODUCTION PREPARATION FOR SERVICE Proper preparation is extremely helpful for efficient service workA clean work area at the start of each job will minimize the incidence of tools and parts becoming misplacedA motor that is excessively dirty should be cleaned before work startsCleaning will occasionally uncover trouble sourcesTools, instruments and parts needed for the job should be obtained before work is startedInterrupting job to locate special tools or repair kits is needless delayThe proper lifting and handling equipment should always be usedWorking on heavy motors without proper equipment can cause motor damage and personal injuryClean fresh fuel should always be used when testing motorsOften troubles can be traced to the use of old or dirty fuelSafety procedures are essentialA motor running without cover must be worked on with great careGasoline, battery acid, exhaust fumes and spilled oil are all potential hazardsUse caution and common sense
REPLACEMENT PARTS
SAFETY WARNING
When replacement parts are required, use genuine OMC parts or parts with equivalent characteristics including type, strength, and materialFailure to do so may result in product malfunction and possible injury to the operator andor passengersIndividual purchasers of Service Manualssee your local AUTHORIZED SERVICE DEALER