Generac Power Systems 53187 - Manual (Page 64)

PART 2
ENGINE MECHANICAL
1
SECTION 2.2
GENERAL INFORMATION
Section 2.2
GENERAL INFORMATION
Introduction
Read this section carefuily before you attem pt to
repair the diesei engine. The section contains vaiuabie
tips pertaining to the repair and/or repiacem ent of en­
gine parts.
When is Major Maintenance Required?
Major engine repairs are usualiy required as a result
of excessively w orn cylinders, pistons, rings and valves.
Data that is gathered from periodic m aintenance and
inspections w ill Indicate the need for m ajor m ain­
tenance. Occurence of any one or m ore of the follow ing
w ill indicate a need for m ajor repairs:
□ Loss of com pression pressure below the stated
lim it.
□ An increase in oil consum ption.
D
Increase in fuel consum ption.
□ Engine w on’t start or starts w ith difficulty.
D
Loss of engine pow er.
D
Rough or noisy operation.
□ Excessive blow by of com bustion gases through
the engine breather.
Som e of the m ajor causes of the sym ptom s listed
above are (a) W eak battery or defective starter m otor,
(b) w orn cylinders, pistons or rings, (c) incorrect valve
clearance, (d) m alfunctioning fuel injection pum p, (e)
incorrect injection tim ing, (f) defective injection nozzles.
General Rules of Repair
W hen perform ing m aintenance on the engine, the
follow ing general rules should be com piled w ith:
□
□
□
□
□
□
Keep the w ork area neat and uncluttered. Ar­
range w ork table(s), engine stands, parts bins,
etc., in a logical sequence of disassem bly.
Prior to disassem bly, locate any alignm ent or
reassem bly m arks on parts to be disassem bled.
If alignm ent m arks cannot be found, place your
ow n alignm ent m arks on the parts.
Pay close attention to the condition of parts
during disassem bly. Many defects w ill be evident
prior to the actual disassem bly of parts.
Use the proper tools for each job.
Use new gaskets, seals and o-rings during reas­
sem bly.
Use a torque w rench to ensure that all fasteners
are properly tightened.
NO TE: Som e com ponents require a special torque
value w hich Is given In the reassem bly sequence In
this m anual. Parts not requiring a special torque
value should be tightened to the value recom ­
m ended In "TORQ UE VALUES FO R M ETRIC
BO LT S" on Page 2.1-3.
PAGE 2.2-1