PERIODIC MAINTENANCE Cleaning Exhaust / Water Mixing Elbow The mixing elbow is attached to the turbocharger. The exhaust gas is mixed with seawater in the mixing elbow. 1. 2. 3. 4.
Remove the mixing elbow. Clean dirt and scale out of the exhaust and seawater passages. If the mixing elbow is damaged, repair or replace. See your authorized Yanmar marine dealer or distributor. Inspect the gasket and replace if necessary.
Every 500 Hours of Operation Perform the following maintenance every 500 hours or 2 years of operation, whichever comes first. • Replacing Exhaust / Water Mixing Elbow • Replacing Rubber Hoses
Replacing Exhaust / Water Mixing Elbow Replace the mixing elbow with a new one every 500 hours or 2 years, whichever comes first, even if no damage is found.
Cleaning the Turbocharger (If Equipped)
See your authorized Yanmar marine dealer or distributor.
Contamination of the turbocharger causes revolutions to drop and engine output to fall.
Replacing Rubber Hoses
If a significant drop in engine output is noted (10% or more), clean the turbocharger. This should be done only by a trained and qualified technician. See your authorized Yanmar marine dealer or distributor.
Replace rubber hoses every 2000 hours or 2 years, whichever comes first. See your authorized Yanmar marine dealer or distributor.
Adjusting the Alternator V-Belt Tension See Checking and Adjusting the Alternator V-Belt Tension on page 62.
Checking the Wiring Connectors See your authorized Yanmar marine dealer or distributor.
Tightening All Major Nuts and Bolts See Tightening Fasteners on page 54 or see your authorized Yanmar marine dealer or distributor.
JH4 Series Operation Manual
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