1981 Johnson/Evinrude 4HP Outboards Service Manual, Page 55Get this manual
TROUBLE ISOLATION CHART PROBLEM: VIBRATION STEP PROCEDURE RESULT
Check propeller
Examine for breaks, bent blades, loose rubber insert
Propel Ier OKGo to step 2Propeller not OKRepair ar replace
Check vibration dampeners
Remove rear swivel bracket and inspect vibration dampeners
Dampeners wornRepl aceDampeners OKGo to step 3
PROBLEM: STEP
NO WATER FROM IDLE RELIEF HOSES PROCEDURE RESULT
Check water intakes
Inspect for clogging
No cloggingGo to step 2Clogging evidentClean intakes
Check water pump and water intake passages
Remove gearcaseDisassemble and inspect water pump components and possible separation of impeller blades from hub, flush out water intake passagesRemove cyl inder headRemove exhaust cover
Worn componentsReplace including water tube grommetNo clogging evidentGo to Step 3
Check water passages in cylinder block
Clean passages
PROBLEM: STEP