SEBU8191-01 65
Maintenance Section
Overhaul (Major)
The coolant sys
tem and the hoses for the coolant
system are not usually supplied by Perkins. The
following text describes a typical method of replacing
coolant hoses
. Refer to the OEM information for
further information on the coolant system and the
hoses for the coolant system.
Pressurize
d System: Hot coolant can cause seri-
ous burns. To open the cooling system filler cap,
stop the engine and wait until the cooling system
components
are cool. Loosen the cooling system
pressure cap slowly in order to relieve the pres-
sure.
1. Stop the engine. Allow the engine to cool.
2. Loosen th
e cooling system filler cap slowly in
order to relieve any pressure. Remove the cooling
system filler cap.
Note: Drain the coolant into a suitable, clean
container. The coolant can be reused.
3. Drain the coolant from the cooling system to a
level that is below the hose that is being replaced.
4. Remove the hose clamps.
5. Dis con
nect the old hose.
6. Replace the old hose with a new hose.
7. Install the hose clamps with a torque wrench.
Note:
For the correct coolant, see this Operation and
Maintenance Manual, “Fluid Recommendations”.
8. Re fil
l the cooling system. Refer to the OEM
information for further information on refilling the
cooling system.
9. Clean the cooling system filler cap. Inspect the
cooling system filler cap's seals. Replace the
coo
ling system filler cap if the seals are damaged.
Install the cooling system filler cap.
10. Sta
rt the engine. Inspect the cooling system for
leaks.
i02461950
Overhaul (Major)
Scheduling a Major Overhaul
The need for a
major overhaul is determined by
several factors:
•
An increase
of oil consumption
•
An increase of crankcase blowby
•
A decrease and variation of cylinder compression
Other fact
ors must also be considered for determining
a major overhaul:
•
The servi
ce hours of the engine
•
The wear metal analysis of the lube oil
•
An increase in the levels of noise and vibration
An incre
ase of wear metals in the lube oil indicates
that the bearings and the surfaces that wear may
need to be serviced. An increase in the levels of
noise an
d vibration indicates that rotating parts
require service.
Note: I
t is possible for oil analysis to indicate a
decrease of wear metals in the lube oil. The cylinder
liners may be worn so that polishing of the bore
occur
s. Also, the increased use of lube oil will dilute
the wear metals.
Monit
or the engine as the engine accumulates
service hours. Consult Perkins Engines Stafford
about scheduling a major overhaul.
Note: Thedrivenequipmentmayalsorequireservice
when the engine is overhauled. Refer to the literature
that
is provided by the OEM of the driven equipment.
Majo
r Overhaul Information
During a major overhaul, all of the bearings,
sea
ls, joints, and components that wear should be
disassembled. The parts should be cleaned. The
parts should then be inspected. If necessary, the
par
ts should be replaced. The crankshaft should be
inspected and measured for wear. The crankshaft
may require regrinding. Alternatively, the crankshaft
ma
ybereplaced.
Inspecting Components
Inspect the following components during a major
overhaul.
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