Exhaust System - Hyundai u125 series Installation & Operation Manual

4. EXHAUST SYSTEM

• Your Hyundai SeasAll engine's exhaust system consists of a coolant-cooled exhaust
manifold and a seawater-cooled exhaust elbow (water injected wet exhaust system).
• The vessel's exhaust line should not be made too long and should be as straight as
possible. The maximum back pressure of the exhaust gas should be under 350 mbar.
• Make sure that the shortest height between bottom of the exhaust elbow and the center
of the crank axis is 370 mm.
• If the distance between the bottom of the exhaust elbow and the waterline is less than
15cm, or if the waterline is above the water injection point, there is a risk of flowing back
(siphoning by engine stopping and outside seawater entering through the transom
exhaust hole).
• In order to avoid this risk, an air ventilation unit and exhaust riser are needed. If in doubt
about exhaust system installation, please contact your nearest Hyundai SeasAll dealer.
Outer diameter of elbow is 60.5mm
INSTALLATION & OPERATION MANUAL
U125 Series Engines
Exhaust elbow bottom
×
IF IN DOUBT ABOUT EXHAUST SYSTEM INSTALLATION, PLEASE
CONTACT YOUR NEAREST HYUNDAI SEASALL DEALER.
150mm
× Sea waterline
370mm
Center of crank axis
CAUTION
-26-
×