1974 Johnson 25HP Outboards 25R74 25E74 Models Service Repair Manual JM-7406, Page 15Get this manual
Quality of the image is intentionally reduced!
2-8 TROUBLE TROULE (CONT)
OVEREAING POWER HEADSee Section Exhaust cover gasket leaking Inner exhaust cover leaking Thermostat broken Power head gasket improperly installed or damaged Head