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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

 

Electrical Equip.12 Volt - 51 Amp W/Glow Plugs(SAE) 30 HD. (CD) or 10W40) - CAUTION:FILL ONLY TO FULL MARK ON DIPSTICKLubrication (Trans.)FILL TO FULL RING ON DIPSTICK
UNIVERSAL MODEL M4-30 SPECIFICATIONS
Pictorial views of this engine at the bottom of page.
Horsepower25 @ 3600
No. of Cylinders4
Bore x Stroke2.60 x 2.45
Cubic Inch51.9
Maximum RPM3600
Cruising Range (Approx.)2600 - 3300
Compression Ratio23:1
Lubrication (Eng. Approx. Ots.)4
(Type Aft. A or GM-DEXRON - II Do not mix different oils)
Transmission Reduction 2:1
Coolant FWC (50150 Solution Approx.)3 Quarts
Exhaust Flange1 N.P.T.
Fuel Type#2 Diesel
Fuel FilterP/N 298854
Oil FilterP/N 300209
Engine Operating Temp. Degrees F.165 to 195
Propeller RotationRight Hand
Weight (lbs.) 270
Injection NozzlesP/N 302735
Engine is governor controlled to prevent overspeed. It is recommended to carry the following extra parts should the need arise: V-Belt, Sea Water Pump Impeller, Fuel & Lube Oil Filters, 1 Ot. of Trans. Oil, 2 Ots. Lube Oil, 1 Gal. 50/50 Coolant.  All pictorial views and specifications subject to change without notice.

M4-30 Engine Image - Copyright 2000 All Rights Reserved TOAD Marine Supply