1979 Evinrude 4 HP Outboards Service Manual, PN 5424, Page 65Get this manual
TROUBLE ISOLATION CHART PROBLEM: STEP VIBRATION RES ULT PROCEDURE
Check propeller
Exam ne for breaks, bent bl ades, loose rubber insert
Prope ler OKGo to step 2Prope ller not OKRepair or replace
Check vibration dampeners
Remove rear swive bracket and inspect vibration dampeners
Dampeners wornRepl aceDampe ners OKGo to step 3
PROBLEMSTEP
NO WATER FROM OVERBOARD IND ICATOR PROCEDURE RESULT
Check wate intakes
Inspect for clogging
No loggingGo to step 2C logging evidentClean intakes
Check water pump and water int ake passages
Remove gearcaseDi sassemb le and inspect water pump components and possib le sepa ration of impe ll er blades from hub, fl ush out wa ter in take passages
Worn componentsReplace in luding wa ter tube grommet
PROBLEM: STEP
NO ISY GEARCASE PROCEDURE RESULT