BMW Marine D12 Diesel Engine Shop Manual - PDF DOWNLOAD

Workshop Manual BMWD 12

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BMW .Marine Engines

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BMW Dl 2 Marine engine DESCRIPTION The D 12 marine engine is a single-cylinder, four-stroke Diesel engine with direct injection. It features a single-circuit cooling system. The coolant pump with Neoprene impeller is driven directly from the crankshaft. The A.C. generator is located in the flywheel and, like the electric starter, is standard epuipment. The injection pump is driven from the camshaft. The injection system bleeds itself automatically.

GENERAL This manual describes the overhaul of the BMW D 12 marine engine when not installed. All removal, installation and overhaul jobs on a specific assembly (component) are always combined into one section and named after the assembly.

The sequence of the sections corresponds to the job sequence in stripping the engine.

Additionally, at the beginning of each section the jobs are listed which are required to remove (overhaul) the assembly (component) in each case, if the engine is not being completely stripped.

The job sequence for assembling the complete engine is given as a list of key words with the title “Job sequence in assembling the engine” follçwing the overhaul sections.

The terms “top, bottom, front, rear, left, right” invariably are related, unless otherwise defined in the text, to the installed position of the engine as viewed in the direction of travel.

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Figures the manual are first, numbered consecutively throughout.

When are tomade to Figures text, the inFigure No. is given followed by the item No. in the Figure, e.g.,cross (25/1)references is a reference Fig. 25, item 1. in the

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BMW Dl 2 Marine engine Contents C Checking the functioning of injection pump and injector Checking the generator Cooling system (schematic) D Description

Page 11 4 1

F Fuel system (schematic) G General

1

Installing the cylinder head Installing the valves

19 26

J Job sequence in assembling the engine

50

M Measuring the valve projection

27

0 Overhauling the injector nozzle

37

R Removing Removing Removing Removing Removing Removing Removing Removing Removing Removing Removing Removing Removing Removing Removing Removing Removing Removing Removing Removing Removing Removing Removing

and installing retaining plate with engine electricals and installing the air filter and installing the bearing flange and installing the camshaft assembly and installing the connecting rod and installing the crankshaft and installing the cylinder and installing the decompression lever and installing the engine stop magnet and installing the exhaust manifold and installing the fuel control system and installing the fuel pump and installing the gearbox and installing the generator and installing the injection pump and installing the piston and installing the rocker arms and installing the rocker levers and installing the starter and installing the timing cover and installing the water pump the cylinder head the valves

S Service and maintenance Setting the decompression device Setting the engine speed Setting the injection pump Setting the valves Special tools Stripping and assembling the water pump T Technical data and specifications Tightening torques

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Winter lay-up and lengthy operating breaks Wiring diagram

2

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6 15 14 38

47 28 22 32 16 41 32 8 46 21 40 7 33 30 17 25

23 28 31 51

55 5

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BMW Dl 2 Marine engine SERVICE UND MAINTENANCE

Daily

Every

14 days

After every 50 op. hrs or once peryear

Every 100 Every 150 op. hrs or once op. hrs or per year ev. 2 years

Check engine oil Fuel filter (drain condensate ancidirt) Engine oil change (first time after 10 hrs.)

Check/set valves Change fuel filter Clean fuel pump screen Exchangeairfilterelement Check gearbox oil level Change gearbox oil Clean injector Check hoses and lines Clean injection pump

When necessary

Exchange zinc anodes Check/exchange impeller (water pump) Set decompression device (always after valves have been set)

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BMW Dl 2 Marine engine COOLING SYSTEM

C 3 4

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1) 2) 3) 4) 5)

Water pump Cylinder Cylinder head Thermostat Exhaust pipe

C

FUEL SYSTEM

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1) 2) 3) 4) 5) 6) 7) 8)

Tank vent Filler neck Fuel tank Fuel filter Hand pump Fuel pump Injection pump Injector

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20 L starter Anlasser

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Zusatzkobelboun,.cpifonal .1 Sanderzub wlrfogharness Instr. t gauge Panel•tao pane’

Sondergub 0$/and!

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Drehzohlmesser tachometer

Sanderzub ep~gpat -

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Sonderiub.,optional

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Instcf.2gauges Panel 052_- a~tianal Sonderzub, panel

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Voltmeter uattmeler

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12 ag/or Natorkabetbaum w/rfoj~arness 13 alternator Genera tar (SIn tar) 74j Regelgleichrichter ergilat or reef/ftc, 15,4impaln.sader Impulsgeber 16 elMogn.Scha!ter calve engIne stop Motor 77 Slarterrelais re lay start

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Schaltplan electric diagram -—

Motor +lnstrumente engine and instruments

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BMW Dl 2 Marine engine REMOVING AND INSTALLING RETAINING PLATE WITH ENGINE ELECTRICALS

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Removing retaining plate with engine electricals Fig. 4 Sever the cable clamp. Pull back the rubber protective cap (4/1) on the starter and screw off the electrical lead (4/2). Disconnect the plug-in connector (4/3) from the starter. Disconnect the electrical leads from the temperature pick-up (4/4) and, where an automatic engine shut-off device is fitted as special equipment, from the magnet (4/5) as well.

Fig. 5

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Disconnect the four plug-in connectors (5/1) of the stator leads.

Unscrew the two hex. nuts, remove the grounding cable (5/2) and take the retaining plate (5/3) off the

flywheel housing.

C Installing retaining plate with engine electricals.

Installation takes place in the reverse sequence to removal.

Caution: Pay attention to polarity when the electrical leads are connected up.

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