Engine

Specs

• Yanmar 4JH2E, 50 hp inboard, freshwater-cooled diesel
• Repowered 1998 (current engine)
• Serpentine belt conversion driving the Balmar 120A alternator
• Spare parts aboard: filters, belts, seals, wiring, etc.

Oil

• Capacity (with filter): 4.8 L (5.1 qt)
• Grade: Chevron Delo 400 XLE 15W-40 CK-4 (or any 15W-40 CD or higher)

Raw water pump — separately lubricated (gotcha)

The 4JH2E has two oil fill plugs, both labeled "oil" and physically interchangeable. Don't conflate them:

• Valve cover = main crankcase (the 4.8 L fill above)
• Pump assembly fill = raw water pump gear oil (~100–200 mL). Use vacuum extraction to drain — no drain plug.

The pump fill is a real maintenance item, not optional.

Coolant Drain Ports

For coolant system service (changes, not winterization):

Point	Location
Heat exchanger drain	Front of block, below the first pulley
Engine block drain	Starboard side, rear of block (transom end), above crankshaft centerline
Expansion tank	Remove cap to allow air in while draining

The block drain is hard to find in service manuals — confirmed via Seloc manual for '75-'98 4JH/4JH2 series.

Fuel