BMW D7 Owner's Manual

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Owners Manual
D7

BMW Marine Engines

This copy of the BMW D7 Owners Manual has been re-created using images computer
scanned from a manual rather than original artwork. It has also been re-formatted in
“portrait” style to display and/or print better on computer systems.

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This manual was written on your behalf in an effort to help you enjoy your new BMW
Marine Engine to the maximum. No marine engine, be it the best in the world, will
perform at it’s best during a long life, without proper care and maintenance.

Please read this manual carefully before you set out on the first trip with your new BMW
Marine Engine.

For the practical boat owner, some maintenance procedures are described in this
manual. Next to some jobs, you will find this marking which indicates that the work
will require special tools as well as certain special knowledge. It is, therefore,
recommended that your authorized BMW Marine Dealer complete these operations.

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INDEX

ENGINE DESCRIPTION 4
INSTRUMENTS AND CONTROLS 6
STARTING AND OPERATING 7
SERVICE & MAINTENANCE 12
FUEL SYSTEM 13
LUBRICATION SYSTEM 16
COOLING SYSTEM 17
VALVE SYSTEM 19
ELECTRICAL SYSTEM 20
WINTER LAY UP AND RECOMISSION 21

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4

ENGINE DESCRIPTION

The BMW D7 is a single-cylinder, four-stroke, direct-injection diesel engine. The engine
is equipped with a raw-water cooling system, fed by an impeller type pump driven by the
crankshaft. Electrical starting and charging systems are standard as is an automatic air
bleeder device in the fuel system.

Technical Data

Displacement 280cc 17.0 cu in
Stroke & Bore 67 x 73 mm 2.63 x 2.87 in
Max output at min

-1

(RPM) 4.5 kW / 3600 6 HP / 3600

Max torque at min

-1

(RPM) 11.7 Nm / 3300

1.2 kpm / 3300

8.7 lb ft / 3300

Compression Ratio 19:1
Weight, dry engine incl. Gearbox 68 kg 150 lb.
Gearbox reduction 2.7
Maximum engine inclination 15 deg

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Specifications Engine Gearbox

Fuel Diesel Oil

DIN 51601

(USA #2)
Fuel Filter BMW 13 32 1 329 270
Lubrication oil
Type
Capacity – Litre (US gal)

HD-API CC/CD SAE 30

1 litre (0.26 US Gal)

ATF Dexron

0.4 litre (0.1 US Gal)
Air Filter BMW 13 71 1 329 269
Injector make Bosch
Injection pressure 135 + 8 bar
Injection pump Bosch PFE 1 Q 55/19
Starter motor make Bosch
Alternator, charging capacity 14v 350w
Battery, rec capacity 12v 60 Ah
Polarity Negative ground
Raw-water pump Johnson
Gearbox Hurth HBW 5

Adjustment Data

Injection ends 11.5 – 12.5 deg BTDC
Tappet clearance 0.15 mm .006 in

Torque Nm lb.ft

Injector retainer 10 7.2
Cylinder head bolts 35 25

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6

INSTRUMENTS & CONTROLS

Instruments

The BMW D7 is equipped with an instrument panel as shown:

1. Starter Switch – with three positions:
”O” – the circuit is switched off, and the key can be removed
”II” – the current is switched on and the alternator charging control lamp lights
”S” – the started is engaged. When the engine fires the key should be released
and will automatically return to position “II”

2. Alternator Charging Control Lamp – is normally out when the engine is running
above idle speed

3. Engine Temperature Control Light – should be out at all times except if engine
temperature exceeds 70oC or 160oF. In such cases the engine must be stopped
at once or severe damage may occur. Find the trouble before the engine is
restarted.

4. The panel also has a reserve lamp marked “OIL”, which is not connected

Controls

Throttle and gearshift are both operated by single-lever remote control, which works as
shown:

N = Neutral
F1 = Forward gear engaged
F2 = The RPM increases
B1 = Reverse gear engaged
B2 = RPM increases

To disengage the gearshift mechanism, push the knob – 2 – fully in, for instance when
starting the engine.

Aloha Owners Association note – the control fitted to Aloha 27s is not always the
same as this, and in some cases you pull the knob OUT to disengage.

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7

STARTING AND OPERATING

The Decompression Valve

The automatic decompression valve makes starting easier, particularly manual starting.
The valve is operated by a twist grip. In the “O” position the valve is closed, while in the
“1” sector it is open, but the automatic control device is not engaged.

Turning the grip further – always clock-wise – will engage the automatic control. When
the engine is cranked, the valve will automatically return notch by notch to the “0”
position. This takes four full turns of the crank handle and the speed gained thereby
should make the engine fire at the first following compression stroke.

Use of the decompression valve is also helpful when the battery is too low for sufficient
cranking speed.

NOTE – never use the decompression valve to stop the engine

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