Generac Power Systems MITSUBISHI GAS ENGINE 0G2832 User manual

2.4
SERVICE
MANUAL
Manual Part No. 0G2832
MITSUBISHI
GAS
ENGINE

FOREWORD
This manual has been published by GENERAC® POWER SYSTEMS, INC.
to aid our dealers’ mechanics, company service personnel and general con-
sumers when servicing the products described herein.
It is assumed that these personnel are familiar with the servicing proce-
dures for these products, or like or similar products, manufactured and
marketed by GENERAC® POWER SYSTEMS, INC. It is also assumed that
they have been trained in the recommended servicing procedures for these
products, which includes the use of mechanics hand tools and any special
tools that might be required.
Proper service and repair is important to the safe, economical and reliable
operation of the products described herein. The troubleshooting, testing,
service and repair procedures recommended by GENERAC® POWER
SYSTEMS, INC. and described in this manual are effective methods of
performing such operations. Some of these operations or procedures may
require the use of specialized equipment. Such equipment should be used
when and as recommended.
We could not possibly know of and advise the service trade of all conceivable
procedures or methods by which a service might be performed, nor of any
possible hazards and/or results of each procedure or method. We have not
undertaken any such wide evaluation. Therefore, anyone who uses a pro-
cedure or method not recommended by the manufacturer must first satisfy
himself that neither his safety, nor the product’s safety, will be endangered
by the service or operating procedure selected.
All information, illustrations and specifications contained in this manual are
based on the latest product information available at the time of publication.
However, GENERAC® POWER SYSTEMS, INC. reserves the right to change,
alter or otherwise improve the product at any time without prior notice.
Some components or assemblies of the product described in this manual
may not be considered repairable. Disassembly, repair and reassembly of
such components may not be included in this manual.
The engines described herein may be used to power a wide variety of prod-
ucts. Service and repair instructions relating to any such products are not
covered in this manual. For information pertaining to use of these engines
with other products, refer to any owner’s or service manuals pertaining to
said products.

This engine has been engineered for use in
Generac Power Systems products. The contents of
this manual have been reprinted from the original
manufacturer’s service and repair manual.
SERVICE RECOMMENDATIONS ................................................................................................................ A_2
MITSUBISHI CONTENTS ........................................................................................................................................
2.4 Liter Gas Engine Table of Contents

2.4 Liter Gas Engine Service Recommendations
2
◆ ENGINE OIL RECOMMENDATIONS
The unit has been filled with “break in” engine oil
at the factory. Use a high-quality detergent oil clas-
sified “For Service CC, SD, SE or SF.” Detergent oils
keep the engine cleaner and reduce carbon deposits.
Use oil having the following SAE viscosity rating,
based on the ambient temperature range anticipated
before the next oil change:
Temperature Oil Grade (Recommended)
Above 75º F (24º C) SAE 30W
40º to 75º F (4.4º to 24º C) SAE 20W or 15W-40
10º to 40º F (-12º to 4.4º C) SAE 10W or 15W-40
Below 10º F (-12º C) SAE 5W-30 (Synthetic) or 5W-20
Crankcase Oil Capacity....... 1.125 U.S. Gallons (w/filter)
◆ COOLANT
Use a mixture of half low silicate, ethylene glycol base
antifreeze and half soft water. Use only soft water and
only low silicate antifreeze. If desired, you may add a
high quality rust inhibitor to the recommended cool-
ant mixture. When adding coolant, always add the
recommended 50-50 mixture.
Coolant Capacity ..................................1.80 U.S. gallons
*Do not remove the radiator pressure cap while
the engine is hot or serious burns from boiling
liquid or steam could result.
DANGER
*Ethylene glycol base antifreeze is poisonous.
Do not use your mouth to siphon coolant from
the radiator, recovery bottle or any container.
Wash your hands thoroughly after handling.
Never store used antifreeze in an open con-
tainer because animals are attracted to the
smell and taste of antifreeze even though it is
poisonous to them.
*Do not use any chromate base rust inhibitor
with ethylene glycol base antifreeze, or chro-
mium hydroxide (“green slime”) will form and
cause overheating. Engines that have been
operated with a chromate base rust inhibitor
must be chemically cleaned before adding eth-
ylene glycol base antifreeze. Using any high
silicate antifreeze boosters or additives also
will cause overheating. We also recommend
that you DO NOT use any soluble oil inhibitor
for this equipment.

2.4 Liter Gas Engine Service Recommendations
3
8 KW - 35 KW SMALL STANDBY GENERATOR SETS
Following is a recommended maintenance schedule for Generac small standby and residential generator sets
from 8 kW to 35 kW in size, and applies to both diesel engine and gas engine driven units. The established
intervals in the schedule are the maximum recommended when the unit is used in an average service applica-
tion. They will need to be decreased (performed more frequently) if the unit is used in a severe application.
Use the unit hour meter or calendar time, whichever occurs first, from the previous maintenance interval to
determine the next required maintenance interval.
Service Maintenance Interval Information:
The various service maintenance intervals are designated by interval numbers as follows:
1An early inspection of the generator set to insure it is ready to operate when required and to identify any
potential problem areas.
Performed monthly or following each 10 hours of operation of the unit and requires approximately .5
man-hours per unit to complete.
This inspection may be performed by the end user providing the following safety steps are taken to prevent
the engine from starting automatically without warning:
To prevent injury, perform the following steps in the order indicated before starting any maintenance:
• Disable the generator set from starting and/or connecting to the load by setting the control panel
Auto-Off-Manual switch to the “OFF” position.
• Remove the control panel fuse.
• Turn off the battery charger.
• Remove the negative battery cable.
*The battery charger must be turned off BEFORE removing the battery cable to prevent an over current
condition from burning out sensitive control panel components and circuits.
Following all maintenance, reverse these steps to insure the unit is returned to standby setup for normal
operation when required.
2A break-in service inspection of the generator set to insure it is ready to operate and carry the load when
required, and to identify any potential problem areas.
Performed ONLY ONCE following the first three months or the first 30 hours of operation after purchase
of the unit and requires approximately 2.5 man-hours per unit to complete.
This inspection contains some maintenance tasks which require special tools, equipment, and/or knowledge
to accomplish and should be performed only by an authorized Generac Service Dealer.
3An operational inspection of the generator set to insure it is ready to operate and carry the load when
required, and to identify any potential problem areas.
Performed semi-annually or following each 50 hours of operation of the unit and requires approximately
1.5 man-hours per unit to complete.
This inspection contains some maintenance tasks which require special tools, equipment, and/or knowledge
to accomplish and should be performed only by an authorized Generac Service Dealer.
4A mid-level inspection of the generator set to insure it is ready to operate and carry the load when required,
and to identify any potential problem areas.
Performed annually or following each 100 hours of operation of the unit and requires approximately 4.0
man-hours per unit to complete.
This inspection contains some maintenance tasks which require special tools, equipment, and/or knowledge
to accomplish and should be performed only by an authorized Generac Service Dealer.

4
Liter Gas Engine Service Recommendations
Maintenance Tasks Level 1 Level 2 Level 3 Level 4
Recommended
to be done
monthly/ 10 hrs.
Task
Comp.
(Date-
Initials)
Required to be
done 3 months/
Break-in /30 hrs.
Task
Comp.
(Date-
Initials)
Required to
be done Semi-
Annually/50 hrs.
Task
Comp.
(Date-
Initials)
Required to be
done Annually/
100 hrs.
Task
Comp.
(Date-
Initials)
1.Disable the unit from
operating per the first
page warning.
• • • •
2.Check the engine oil
level. Adjust as neces-
sary.
• • • •
3.Check the engine cool-
ant level. Adjust as nec-
essary.
• • • •
4.Check the engine cool-
ant thermal protection
level. Correct as neces-
sary.
•
5.Check the natural gas
delivery system on gas
engine driven units.
Tighten connections as
necessary.
• • •
6.Check the diesel fuel
supply level for diesel
engine driven units. Fill
as necessary.
• • • •
7.Drain water and sedi-
ment from the diesel fuel
tank on diesel engine
driven units.
• • •
8.Drain water from the
fuel line water separa-
tor on diesel engine
driven units if the unit is
equipped with one.
• • •
9.Check the air inlets and
outlets for debris. Clean
as necessary.
• • • •
10.Check the battery
electrolyte level if
accessible. Adjust as
necessary.
• • • •
11.Check the battery
posts, cables, and
charger for loose con-
nections, corrosion,
and proper operation.
Correct as necessary.
• • • •
12.Check the unit wiring
for loose connections,
corrosion, and dam-
age. Correct as neces-
sary.
•
13.Check the engine
accessory drive belts
for wear, weather
cracking, and damage.
Replace as necessary.
•

5
2.4 Liter Gas Engine Service Recommendations
Maintenance Tasks Level 1 Level 2 Level 3 Level 4
Recommended
to be done
monthly/ 10 hrs.
Task
Comp.
(Date-
Initials)
Required to be
done 3 months/
Break-in /30 hrs.
Task
Comp.
(Date-
Initials)
Required to
be done Semi-
Annually/50 hrs.
Task
Comp.
(Date-
Initials)
Required to be
done Annually/
100 hrs.
Task
Comp.
(Date-
Initials)
14.Visually inspect the
unit looking for leaks,
wear or damage, loose
connections or compo-
nents, and corrosion.
Correct as necessary.
• • • •
15.Test the engine and
transfer switch safety
devices. Correct and/or
adjust as necessary.
•
16.Initiate an automatic
start and transfer of the
unit to site load and
exercise it for at least 1
hour looking for leaks,
loose connections
or components, and
abnormal operating
conditions. Correct as
necessary.
• •
17.Start and exercise the
unit at full rated load
(use a load bank if the
site load is not enough)
for at least 2 hours
looking for leaks, loose
connections or com-
ponents, and abnormal
operating conditions.
Correct as necessary.
•
18.Change the engine oil.
•
19.Replace the engine oil
filter(s).
• •
20.Replace the engine air
filter(s).
• •
21.Replace the engine
fuel filter(s) on diesel
engine driven units
and re-prime the fuel
system.
• •
22.Check the engine
spark plugs on gas
engine driven units.
Clean and re-gap orre-
place as necessary.
• •
23.Perform a 5 minute no-
load operational run of
the unit looking for any
post service problems.
• •
24.Return the unit to
standby setup for oper-
ation when required.
• • • •

Notes