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Caution
General Information
Preparations For Starting
Before Starting
Starting Engine
Engine Break-in and General Running
Stopping the Engine
Decompression Lever
Instrument Panel
Wiring Diagram
Preparing Engine for Storage
Preparing Engine for Spring Service
Fuel Injection Timing
Diesel Valve Timing
Adjusting Fuel Timing
Decompression Device Adjustment
Fuel System
Fuel Bleeding
Oil Filter Change
Sea Water Pump and Impeller Replacement
Model 15 Sea Water Circulation Diagram
Model 12, 18, 20, 25, 25XP, 30, 40 & 50 Water
Fresh Water Circulation Diagram

Hurth Transmission
Periodic Service Chart for Engine
Marine Engine Warranty - Limited

Engine Specifications and Images
(by engine model)

M2-12
M3-20
M4-30
M-25XP
M-35
M-30
M-40
M-50
M-12
M-15
M-18
M-20
M-25

 

DIESEL VALVE ADJUSTMENT

Adjustment of
Valve Clearance

* Models 12, M2-12, 15, 18, 25, 25XP, 35, M3-20, M4-30

**Models 20, 30, 40 & 50

*Valve clearance
M-12-M2-12, 15-18 006 - .007
M-25XP-35, M3-20, M4-30 (0.145 - 0.185 mm)

**Valve Clearance
M-20-30-40-50 007 - .009
(.0.18 - 0.22 mm)

(with engine cold.)
Intake valve opens 20 B TDC
Intake valve closes 45 A BDC

Exhaust valve opens 50 B BDC
Exhaust valve closes 15 A TDC
Model 12 Models 15-18-25 25XP 35 Models 20-30-40-50

Turn crankshaft over by hand (Clockwise) being careful not to damage the spline on the end of the shaft. Turn until pointer aligns with timing mark 1TC on flywheel (Figure 4A). Check to make sure both intake and exhaust valves on No. 1 cylinder are loose. If not, turn crankshaft one more complete revolution to bring No. 1 cylinder onto compression. Valves can now be set on No. 1 cylinder. This procedure is true for No. 1 cylinder on all models. To set the valves on the remaining cylinders, follow the matching diagrams above being sure that both intake and exhaust valves are loose at the corresponding cylinder before adjusting.

CAUTION: DO NOT use the timing marks 1-Fl, 2-Fl, etc. These marks are used for timing fuel injector pumps only.