Weber MPE 750 NA Marine User manual

402062_SHB_Rev1.1_080611
MPE 750 NA Marine
Closed Loop
MPE 750 NA Marine - Closed Loop
• 402062_I2 749 MAR NA-66 DS V1 2007 1.1
Service Manual
This service manual is valid for the following engine variants:

402062_SHB_Rev1.1_080611
MPE 750 NA Marine
Closed Loop
Service Manual
Table of contents
1 About this document 1
1.1 Meaning of the symbols in the text 1
2 Safety 2
2.1 Basic principle 2
2.2 Meaning of the safety symbols 2
2.3 General safety instructions 3
3 Description 4
3.1 Technical specications 4
3.2 Serial number 4
3.3 Operating materials 5
3.4 Running in the engine 7
3.5 Operating the engine without sea water 7
4 Maintenance 8
4.1 Maintenance work by the user of the vehicle 9
4.2 Maintenance intervals 10
4.3 Decommissioning at the end of the season 11
4.4 Motor oil and oil lter 12
4.5 Engine cooling circuit 18
4.6 Spark plugs 22
4.7 Valve play 25
5 Malfunctions 31
6 Terminology 34
7 Appendix 35
7.1 Directives 35
7.2 Exhaust type authorizations 36
8 Proof of maintenance for work carried out 37

402062_SHB_Rev1.1_080611
MPE 750 NA Marine
Closed Loop
Service Manual
Page 1
1 About this document
1.1 Meaning of the symbols in the text
Symbol /
Sign
Use Explanation
Need Required tools for carrying out the activities in
this section.
Need Required spare parts for the activities in this
section.
Information Information about assembly, e.g. tightening
torques.
Information Note about required lubrication.
[ ] Information Alternative measurement units are in square
brackets.
Information This sign indicates recommendations and
particularities.
1.
2.
...
Instruction Here you must do something.
Instructions must be carried out in the
sequence specied. Deviations from the
specied sequence can cause damage to the
engine and accidents.
– Instruction.
List.
Here you must do something.
Enumeration.
See ... Cross-reference References to other chapters and gures.
This chapter will familiarize you with the structure of this document so that you can nd
the information it contains quickly and easily.
This document uses symbols and signs that allow you to nd information quickly. Please
read the explanations of the symbols and signs in this chapter. Be sure to read all safety
instructions in this service manually especially carefully.
Always keep this documentation handy and make sure it is always in the vehicle. Be sure
to inform other users of all safety provisions.

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MPE 750 NA Marine
Closed Loop
Service Manual
Page 2
This engine is state-of-the-art and built according to recognized safety-technical
regulations. Nevertheless, people can be injured or the engine damaged if the safety
instructions in this manual are disregarded.
Only put the engine into operation if it is technically perfect. Faults that compromise
the safety of people or of the engine must be eliminated immediately by trained service
personnel.
Arbitrary constructional changes to the engine are not permitted and void the warranty.
In addition to this documentation, heed generally-valid legal and other binding regulations
for accident prevention and environmental protection. Such duties can affect the handling
of hazardous materials or the provision and wearing of personal safety equipment or
trafc regulations, for example.
2 Safety
2.2 Meaning of the safety symbols
2.1 Basic principle
Disregarding this sign can endanger life and
limb.
Disregarding this sign can cause injuries to
persons.
Disregarding this sign can cause damage to the
engine.
DANGER
WARNING
ATTENTION

402062_SHB_Rev1.1_080611
MPE 750 NA Marine
Closed Loop
Service Manual
Page 3
2.3 General safety instructions
The engine may only be operated at idle speed
for a maximum of 30 seconds without sea water.
Engine damage due to overheating.
See Chapter Operating the engine without sea
water.
Lift a submerged engine out of the water as
quickly as possible and take it to a professional
shop for maintenance within 24 hours. Belated
measures can cause severe damage to the
engine.
ATTENTION
ATTENTION

402062_SHB_Rev1.1_080611
MPE 750 NA Marine
Closed Loop
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009999
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Service Manual
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The MPE 750 Marine - Closed Loop is a 2-cylinder in-line engine. It is intended for recre-
ational watercraft. It is not designed for constant loads at high speeds as can occur during
races, for example.
3 Description
3.1 Technical specications
Type 2-cylinder parallel twin with vibration compensation shaft
Displacement 749 cm³
Engine power 49 kW (66 PS) [66 HP] ISO 8178 7500 U/min [RPM]
Max. speed 8000 U/min [RPM]
Combustion system Intake-manifold fuel injection
Injection regulation electronic
Lubrication system Dry sump
Cooling system Water-cooled with closed coolant circuit and open sea
water cooling circuit
3.2 Serial number
The 8-digit serial number (1) serves to
identify the engine. It is engraved in the
motor housing (2) and glued on as a label
(3). Using this number, it is possible to
determine the production date and all
parts built into the engine.

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MPE 750 NA Marine
Closed Loop
Service Manual
Page 5
3.3 Operating materials
The use of other operating materials causes
damage to the engine and the voiding of the
warranty.
ATTENTION
Fuel
Fuel quality Unleaded gasoline according to DIN 51607 („super
unleaded“), with an octane rating of at least 95 ROZ [RON] or
85 MOZ [MON].
In case of emergency, unleaded fuel with 91 ROZ [RON] or
82.5 MOZ [MON] may be used for a short time.
Lower-quality fuels should only be used in case
of emergency. If used regularly, they cause
decreases in performance and possibly damage
to the engine.
ATTENTION
Lubricant
Oil specication Recommendation: 15W 50 completely synthetic, API SH,
JASO MA
Alternative: 0W 50
Minimum requirement: 0W 40
Fill quantity Initial lling 4.2 liters [4.4 qt (US)]
Oil change with lter 3.3 - 3.5 liters [3.5 - 3.7 qt (US)]

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MPE 750 NA Marine
Closed Loop
Service Manual
Page 6
Coolant
Coolant additive Coolant additive based on ethylene glycol
Silicate- and nitrite-free. Suitable for aluminium engines.
Anti-freeze mixture 50 % water + 50 % coolant additive
Manufacturer’s ll provides frost protection up to -37 °C [-34.6 °F]
Recommended minimum frost protection up to -30 °C [-22 °F]
Fill quantity 3,3 liters [3.5 qt (US)]
Approved
coolant additives BASF Glysantin G 30
Chevron Havoline Extended Life Coolant XLC+B
Valvoline Zerex G 30
Coolant additives protect not only against frost,
but also against corrosion and amongst other
things. Therefore, the coolant will be lled in the
specied mixture ratio the whole year round. The
mixture ratio may not be reduced by relling.
ATTENTION
Different types of coolant should not be mixed.
Use only approved coolants for rell. The mixture
of different types of coolant can cause severe
damage to the engine.
ATTENTION

402062_SHB_Rev1.1_080611
MPE 750 NA Marine
Closed Loop
Service Manual
Page 7
3.4 Running in the engine
3.5 Operating the engine without sea water
The engine may only be operated at idle speed
for a maximum of 30 seconds without sea water.
Engine damage due to overheating.
ATTENTION
Weber Automotive GmbH recommends that during the rst ve hours of operation, you
should not operate the engine over 6,000 U/min [RPM]. This protective running-in has a
positive effect on the engine‘s lifespan.
If it is necessary to operate the engine longer than 30 seconds without sea water, the
vehicle‘s rinsing equipment must be used.
See chapter Flush sea water cooling circuit after driving.

402062_SHB_Rev1.1_080611
MPE 750 NA Marine
Closed Loop
Service Manual
Page 8
The table in chapter Maintenance intervals provides the manufacturer’s recommended
intervals for maintenance work. If you follow the maintenance recommendations, a
long lifespan of the engine can be achieved and unnecessary environmental damage
prevented. The Maintenance intervals specied in the table should not be exceeded by
more than 10%.
If not stated otherwise, all activities on the engine described in this manual must be carried
out by trained service personnel.
During the warranty period, maintenance and repair work may only be carried out in
Weber Motor service stations or in associated shops. If necessary, contact your vehicle
dealer.
Weber Automotive GmbH reserves the right to demand that proof of warranty be provided
in writing for warranty service. See Proof of maintenance for work carried out.
The vehicle owner or user is responsible for
adhering to the maintenance intervals. Weber
Automotive GmbH assumes no liability for damage
that arises due to maintenance not carried out.
ATTENTION
4 Maintenance