Caterpillar Cat 318B L Excavator (Prefix AEJ) Service Repair Manual (AEJ00001 and up)

1
Service Repair Manual
Models 318B N, 318B L and 318B LN Excavator
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Product EXCAVATOR Model 318B N EXCAVATOR
AEJ Configuration 318B L and 318B LN Excavators
AEJ00001-UP (MACHINE) POWERED BY 3046 Engine
Disassembly and Assembly 3046 Engine For
Caterpillar Built Machines Media Number
-SENR6458-05 Publication Date -01/04/2004
Date Updated -22/04/2004
i01033379
Lifter Group - Remove and Install SMCS -
1209-010 Removal Procedure Start By A. Remove
the camshaft. Refer to Disassembly and Assembly,
"Camshaft - Remove and Install". NOTICE Keep
all parts clean from contaminants. Contaminants
may cause rapid wear and shortened component life.
Illustration 1
g00532246
3

• Illustration 2 g00532061
• Use a magnet to remove valve lifter (1), as
  shown. Put identification marks on the valve
  lifters for installation purposes.
• Repeat Step 1 for the remainder of the valve
  lifters.

Installation Procedure NOTICE Keep all parts
clean from contaminants. Contaminants may cause
rapid wear and shortened component life.
Illustration 3 g00532061 1. Put 8T-2998
Lubricant on valve lifter (1) prior to
installation. Install valve lifter (1) in the
original location in the cylinder block.
4
2. Repeat Step 1 for the remainder of the valve
lifters. End By Install the camshaft. Refer to
Disassembly and Assembly, "Camshaft - Remove and
Install".
Copyright 1993 - 2020 Caterpillar Inc. All Rights
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Product EXCAVATOR Model 318B N EXCAVATOR
AEJ Configuration 318B L and 318B LN Excavators
AEJ00001-UP (MACHINE) POWERED BY 3046 Engine
Disassembly and Assembly 3046 Engine For
Caterpillar Built Machines Media Number
-SENR6458-05 Publication Date -01/04/2004
Date Updated -22/04/2004
i01597409
Camshaft - Remove and Install SMCS -
1210-010 Removal Procedure 1 Table 1
Required Tools Required Tools Required Tools Required Tools
Tool Part Number Part Description Qty
A 1P-2320 Combination Puller 1
C 1P-2321 Combination Puller 1
C 9S-9153 Puller Jaws 3

• Start By
• Remove the timing gear cover. Refer to
  Disassembly and Assembly, "Housing (Front) -
  Remove".
• Remove the rocker shaft assembly and the
  pushrods. Refer to Disassembly and Assembly,
  "Rocker Shaft and Pushrod - Remove".
• Remove the oil pan. Refer to Disassembly and
  Assembly, "Engine Oil Pan - Remove and Install".
• Note The engine oil pan is facing in the up
  direction in order to retain the lifters in
  position for this procedure.
• NOTICE
• Keep all parts clean from contaminants.
• Contaminants may cause rapid wear and shortened
  component life.

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NOTICE Care must be taken to ensure that fluids
are contained during performance of inspection,
maintenance, testing, adjusting and repair of the
product. Be prepared to collect the fluid with
suitable containers before opening any
compartment or disassembling any component
containing fluids. Refer to Special Publication,
NENG2500, "Caterpillar Tools and Shop Products
Guide" for tools and supplies suitable to collect
and contain fluids on Caterpillar
products. Dispose of all fluids according to
local regulations and mandates.
Note Ensure that the marks on the timing gears
are in alignment. Align the fuel injection drive
gear with the "33" mark with the "3" mark on the
idler gear. Make an alignment of the "2" mark on
the camshaft gear with the "22" mark on the idler
gear. Align the "1" mark on the crankshaft gear
with the "11" mark on the idler gear. The No. 1
cylinder is at the top center position when these
marks are in alignment. 1. Rotate the engine at
180 degrees.
Illustration 1 g00532179 2. Use Tool (A) to
remove bearing (1) from the front of camshaft
gear (2) . Note This step is necessary only if
the camshaft gear is equipped with a bearing.
8
Illustration 2
g00532382
NOTICE Do not damage the lobes or the bearings
when the camshaft is removed or installed.

1. Position camshaft gear (2) so that the gear's
   slots align from the top to the bottom. Remove
   two bolts (3) and the washers that hold thrust
   plate (4). Carefully remove the camshaft, the
   thrust plate and the camshaft gear as an
   assembly.
2. Remove the 12 valve lifters. Refer to Disassembly
   and Assembly, "Lifter Group - Remove and Install".

Illustration 3 g00532384 5. Use tool (C) to
remove camshaft gear (2) from camshaft (5).
Remove thrust plate (4) .
Installation Procedure 1
9
Note In this installation procedure, the engine
needs to remain in the upside-down position in
order to keep the lifters in position while the
camshaft is installed. NOTICE Keep all parts
clean from contaminants. Contaminants may cause
rapid wear and shortened component life.
Note During installation, ensure that camshaft
(4) is clean and lubricate all of the components
with clean engine oil.
Illustration 4
g00532385
1. Install thrust plate (4) onto camshaft (5) .
Always wear protective gloves when handling parts
that have been heated.

• Heat camshaft gear (2) in an oven to a maximum
  temperature of 150 C (302 F) and install
  camshaft gear (2) onto camshaft (5) .
• Install the 12 valve lifters. Refer to
  Disassembly and Assembly, "Lifter Group - Remove
  and Install".
• Note During installation, ensure that the marks
  on the timing gears are in alignment. Align the
  fuel injection drive gear with the "33" mark with
  the "3" mark on the idler gear. Make an alignment
  of the "2" mark on the camshaft gear with the
  "22" mark on the idler gear. Align

10
the "1" mark on the crankshaft gear with the "11"
mark on the idler gear. The No. 1 cylinder is at
the top center position when these marks are in
alignment. 4. Carefully install the camshaft
assembly into the original location in the
cylinder block. Note Caution must be used when
the camshaft is installed in order to not damage
the camshaft lobe or the camshaft bearings.

• Illustration 5 g00532382
• Position camshaft gear (2) so that the gear's
  slots align from the top to the bottom. Install
  two bolts (3) and the washers that hold thrust
  plate (4). Tighten bolts (3) to a torque of 10 to
  13 Nm (7 to 10 lb ft).
• If necessary, install the bearing onto the front
  of the camshaft gear.
• End By
• Install the oil pan. Refer to Disassembly and
  Assembly, "Engine Oil Pan - Remove and Install".
• Install the rocker shaft assembly and the
  pushrods. Refer to Disassembly and Assembly,
• "Rocker Shaft and Pushrod - Install".
• Install the timing gear cover. Refer to
  Disassembly and Assembly, "Housing (Front) -
  Install".
• Removal Procedure 2
• Table 2

Required Tools Required Tools Required Tools Required Tools
Tool Part Number Part Description Qty
A 1P-2320 Combination Puller 1
B 1U-7638 Magnetic Holding Tools 12
C 1P-2321 Combination Puller 1
C 9S-9153 Puller Jaws 3
11

• Start By
• Remove the timing gear cover. Refer to
  Disassembly and Assembly, " Housing (Front) -
  Remove".
• Remove the cylinder head. Refer to Disassembly
  and Assembly, "Cylinder Head - Remove".
• Note This removal procedure is done with the
  engine in the upright position and the valve
  lifters left in the cylinder block.
• NOTICE
• Keep all parts clean from contaminants.
• Contaminants may cause rapid wear and shortened
  component life.

NOTICE Care must be taken to ensure that fluids
are contained during performance of inspection,
maintenance, testing, adjusting and repair of the
product. Be prepared to collect the fluid with
suitable containers before opening any
compartment or disassembling any component
containing fluids. Refer to Special Publication,
NENG2500, "Caterpillar Tools and Shop Products
Guide" for tools and supplies suitable to collect
and contain fluids on Caterpillar
products. Dispose of all fluids according to
local regulations and mandates.
12
Illustration 6
g00532179
The engine is rotated at 180 degrees. 1. Use
Tool (A) to remove bearing (1) from the front of
camshaft gear (2) . Note This step is necessary
only if the camshaft gear is equipped with a
bearing.
Illustration 7 g00534616 2. Install Tool (B) in
order to hold the 12 valve lifters. Note Make
sure that Tool (B) is holding the lifters as far
up in cylinder block (6) as possible.
Illustration 8 g00534473 Note Be careful not to
dislodge the valve lifters from Tools (B) during
removal of the camshaft. NOTICE
13
Do not damage the lobes or the bearings when the
camshaft is removed or installed.
3. Position camshaft gear (2) so that the gear's
slots align from the top to the bottom. Remove
two bolts (3) and the washers that hold thrust
plate (4). Carefully remove the camshaft, the
thrust plate and the camshaft gear as an assembly
from cylinder block (6) .
Illustration 9 g00532384 4. Use tool (C) to
remove camshaft gear (2) from camshaft (5).
Remove thrust plate (4) . Installation Procedure
2 Table 3
Required Tools Required Tools Required Tools Required Tools
Tool Part Number Part Description Qty
B 1U-7638 Magnetic Holding Tools 12
Note This installation procedure is done with
the engine in the upright position and the valve
lifters left in the cylinder block. NOTICE Keep
all parts clean from contaminants. Contaminants
may cause rapid wear and shortened component life.
Note During installation, ensure that camshaft
(4) is clean and lubricate all of the components
with clean engine oil.
14

• Illustration 10 g00532385
• Install thrust plate (4) onto camshaft (5). Heat
  camshaft gear (2) to a maximum temperature of 150
  C (302 F) and install camshaft gear (2) onto
  camshaft (4) .
• Note During installation, ensure that the marks
  on the timing gears are in alignment. Align the
  fuel injection drive gear with the "33" mark with
  the "3" mark on the idler gear. Make an alignment
  of the "2" mark on the camshaft gear with the
  "22" mark on the idler gear. Align the "1" mark
  on the crankshaft gear with the "11" mark on the
  idler gear. The No. 1 cylinder is at the top
  center position when these marks are in
  alignment.
• Carefully install the camshaft assembly into the
  original location in the cylinder block.
• Note Caution must be used when the camshaft is
  installed in order to not damage the camshaft
  lobe or the camshaft bearings.

Illustration 11 g00534616 Note Make sure that
Tool (B ) is holding the lifters as far up in
cylinder block (6) as possible.
15

• Illustration 12 g00534473
• Position camshaft gear (2) so that the gear's
  slots align from the top to the bottom. Install
  two bolts (3) and the washers that hold thrust
  plate (4). Tighten bolts (3) to a torque of 10 to
  13 Nm (7 to 10 lb ft).
• If necessary, install the bearing onto the front
  of the camshaft gear.
• End By
• Install the cylinder head. Refer to Disassembly
  and Assembly, "Cylinder Head - Install".
• Install the timing gear cover. Refer to
  Disassembly and Assembly, "Housing (Front) -
  Install".

Copyright 1993 - 2020 Caterpillar Inc. All Rights
Reserved. Private Network For SIS Licensees.
Wed Dec 2 095811 UTC0800 2020
16
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Product EXCAVATOR Model 318B N EXCAVATOR
AEJ Configuration 318B L and 318B LN Excavators
AEJ00001-UP (MACHINE) POWERED BY 3046 Engine
Disassembly and Assembly 3046 Engine For
Caterpillar Built Machines Media Number
-SENR6458-05 Publication Date -01/04/2004
Date Updated -22/04/2004
i04990496
Camshaft Bearings - Remove and Install SMCS -
1211-010 Removal Procedure Table 1
Required Tools Required Tools Required Tools Required Tools
Tool Part Number Part Description Qty
A 8S-2241 Camshaft Bearing Tool Group 1
A 8H-0684 Ratchet Wrench 1

• Start By
• Remove the flywheel housing. Refer to Disassembly
  and Assembly, "Flywheel Housing - Remove and
  Install".
• Remove the camshaft. Refer to Disassembly and
  Assembly, "Camshaft - Remove and
• Install".
• NOTICE
• Keep all parts clean from contaminants.
• Contaminants may cause rapid wear and shortened
  component life.

17
Illustration 1
g00533094
1. Remove plug (1) from the cylinder block.
Illustration 2
g00533095
Illustration 3 g00533096 2. Use Tool (A) in
order to remove the camshaft bearings from the
cylinder block.
18
Note Refer to the instructions of the 8S-2241
Camshaft Bearing Tool Group for the proper
procedure. Installation Procedure Table 2
Required Tools Required Tools Required Tools Required Tools
Tool Part Number Part Description Qty
A 8S-2241 Camshaft Bearing Tool Group 1
A 8H-0684 Ratchet Wrench 1
NOTICE Keep all parts clean from
contaminants. Contaminants may cause rapid wear
and shortened component life.
Illustration 4
g00533095
19
Illustration 5 g00533096 1. Use Tool (A) in
order to install the camshaft bearings into the
cylinder block. Ensure that the oil hole of the
camshaft bearings are in alignment with the oil
ports in the engine block. Note Refer to the
instructions of the 8S-2241 Camshaft Bearing Tool
Group for the proper procedure.

• Illustration 6 g00533094
• Install plug (1) into the cylinder block. Use
  Loctite 596 .
• End By
• Install the camshaft. Refer to Disassembly and
  Assembly, "Camshaft - Remove and Install".
• Install the flywheel housing. Refer to
  Disassembly and Assembly, "Flywheel Housing -
  Remove and Install".

Copyright 1993 - 2020 Caterpillar Inc. All Rights
Reserved. Private Network For SIS Licensees.
Wed Dec 2 095911 UTC0800 2020
20
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Previous Screen
Product EXCAVATOR Model 318B N EXCAVATOR
AEJ Configuration 318B L and 318B LN Excavators
AEJ00001-UP (MACHINE) POWERED BY 3046 Engine
Disassembly and Assembly 3046 Engine For
Caterpillar Built Machines Media Number
-SENR6458-05 Publication Date -01/04/2004
Date Updated -22/04/2004
i05007631
Engine Oil Pan - Remove and Install SMCS -
1302-010 Removal Procedure NOTICE Keep all parts
clean from contaminants. Contaminants may cause
rapid wear and shortened component life.
NOTICE Care must be taken to ensure that fluids
are contained during performance of inspection,
maintenance, testing, adjusting, and repair of
the product. Be prepared to collect the fluid
with suitable containers before opening any
compartment or disassembling any component
containing fluids. Refer to Special Publication,
NENG2500, "Dealer Service Tool Catalog" for tools
and supplies suitable to collect and contain
fluids on Cat products. Dispose of all fluids
according to local regulations and mandates.
21

• Illustration 1 g00560680
• Remove oil pan drain plug (3) and drain the
  engine oil from engine oil pan (2) .
• Install oil pan drain plug (3) . Tighten the oil
  pan drain plug to a torque of 78 5 Nm (57 4
  lb ft).
• Remove oil tube assembly (5) .
• Remove 30 bolts (1) and the washers from engine
  oil pan (2) . Remove engine oil pan (2) and
  gasket (4) .
• Note A liquid gasket may be factory installed in
  place of an oil pan gasket.

Illustration 2 g00538955 5. Remove two bolts (7)
from engine oil suction tube (6) . Remove engine
oil suction tube (6) .
22
Illustration 3 g00538957 6. Check condition of
O-ring seal (8) . If the O-ring seal is damaged,
use a new part for replacement.
Installation procedure NOTICE Keep all parts
clean from contaminants. Contaminants may cause
rapid wear and shortened component life.
Illustration 4 g00538957 1. Install O-ring seal
(8) on suction pipe (6) .
23
Illustration 5 g00538955 2. Position engine oil
suction tube (6) . Install two bolts (7) in order
to secure the engine oil suction tube .
Illustration 6
g00560680

• Clean engine oil pan (2) .
• Note Ensure that the engine oil pan and all of
  the mating surfaces are free of oil and gasket
  material.
• Install gasket (4) , engine oil pan (2) , bolts
  (1) and the washers. Tighten the bolts to a
  torque of 10 to 13 Nm (7 to 10 lb ft).
• Note Loctite 5127 may be used instead of gasket
  (4) . Both contact surfaces must be completely
  free of oil. Apply gasket material on the
  cylinder block on the inside of the bolt hole
  pattern in a continuous bead in order to help
  prevent an oil leak.
• Install oil tube assembly (5) .
• Fill the crankcase with engine oil to the correct
  level. Refer to the proper Operation and
  Maintenance Manual for the correct engine oil and
  the correct filling procedure.

Wed Dec 2 100010 UTC0800 2020
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Product EXCAVATOR Model 318B N EXCAVATOR
AEJ Configuration 318B L and 318B LN Excavators
AEJ00001-UP (MACHINE) POWERED BY 3046 Engine
Disassembly and Assembly 3046 Engine For
Caterpillar Built Machines Media Number
-SENR6458-05 Publication Date -01/04/2004
Date Updated -22/04/2004
i01037459
Pistons and Connecting Rods - Remove SMCS -
1225-011 Removal Procedure Table 1
Required Tools Required Tools Required Tools Required Tools
Tool Part Number Part Description Qty
A 8S-2269 Ridge Reamer 1
B 6V-9120 Socket (1) 1

• ( 1 ) Tool (B) is a 46 mm socket.
• Start By
• Remove the cylinder head. Refer to Disassembly
  and Assembly, "Cylinder Head - Remove".
• Remove the engine oil pan. Refer to Disassembly
  and Assembly, "Engine Oil Pan - Remove
• and Install".
• NOTICE
• Keep all parts clean from contaminants.
• Contaminants may cause rapid wear and shortened
  component life.

1. Use tool (A) to remove the wear ridge from the
inner surface of the cylinder bore.
25
Illustration 1 g00534937 2. Use Tool (B) to
rotate the crankshaft until two of the pistons
are at the bottom center. Remove four connecting
rod nuts (1) from the connecting rod. Remove two
connecting rod caps (2). Put identification marks
on the connecting rod, the connecting rod cap and
the connecting rod bearings. The identification
marks must be on the bearing tab side for
installation purposes.

• Illustration 2 g00534943
• Note Use tape or rubber tubing on connecting rod
  bolts to protect the crankshaft journals.
• Push the piston and connecting rod (4) away from
  the crankshaft until the piston rings are out of
  the cylinder liners. Remove the piston from
  cylinder block (3) .
• Keep the connecting rods and connecting rod caps
  together. Put an identification mark on each
  piston in order to locate the piston in the
  cylinder block.
• Repeat Steps 1 through 4 for removing the
  remaining pistons and connecting rods.

Copyright 1993 - 2020 Caterpillar Inc. All Rights
Reserved. Private Network For SIS Licensees.
Wed Dec 2 100109 UTC0800 2020
26
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Product EXCAVATOR Model 318B N EXCAVATOR
AEJ Configuration 318B L and 318B LN Excavators
AEJ00001-UP (MACHINE) POWERED BY 3046 Engine
Disassembly and Assembly 3046 Engine For
Caterpillar Built Machines Media Number
-SENR6458-05 Publication Date -01/04/2004
Date Updated -22/04/2004
i01038260
Pistons and Connecting Rods - Disassemble SMCS -
1225-015 Disassembly Procedure Table 1
Required Tools Required Tools Required Tools Required Tools
Tool Part Number Part Description Qty
A 1P-1857 Retaining Ring Pliers 1
B 1U-6683 Ring Expander 1
C 1P-0510 Driver Group 1
Start By A. Remove the pistons and connecting
rods. Refer to Disassembly and Assembly, "Pistons
and Connecting Rods - Remove". NOTICE Keep all
parts clean from contaminants. Contaminants may
cause rapid wear and shortened component life.
27
Illustration 1
g00535407
Piston and Connecting Rod Assembly

• Illustration 2 g00535802
• Use Tool (A) to remove two retaining rings (1) .
• Remove piston pin (2) and connecting rod (3) from
  piston (4) .
• Note Check the condition of the following parts
  retaining rings (1), piston pin (2) and piston
  (4). If these items are worn or damaged, use new
  parts for replacement.

28
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Illustration 3
g00535803
Illustration 4
g00535398
Illustration 5 g00535400 3. Remove piston rings
(5) from pistons (4) with tool (B) . Note Check
the condition of the piston rings. If the piston
rings are worn or damaged, use new parts for
replacement.
30
Illustration 6 g00535404 4. Remove connecting
rod bearing (6) and two bolts (7) from connecting
rod (3) .
Illustration 7 g00535406 5. Use Tool (C) and a
suitable press to remove piston pin bearing (8)
from connecting rod (3) .
Copyright 1993 - 2020 Caterpillar Inc. All Rights
Reserved. Private Network For SIS Licensees.
Wed Dec 2 100208 UTC0800 2020
31
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Product EXCAVATOR Model 318B N EXCAVATOR
AEJ Configuration 318B L and 318B LN Excavators
AEJ00001-UP (MACHINE) POWERED BY 3046 Engine
Disassembly and Assembly 3046 Engine For
Caterpillar Built Machines Media Number
-SENR6458-05 Publication Date -01/04/2004
Date Updated -22/04/2004
i01618074
Pistons and Connecting Rods - Assemble SMCS -
1225-016 Assembly Procedure Table 1
Required Tools Required Tools Required Tools Required Tools
Tool Part Number Part Description Qty
A 1P-1857 Retaining Ring Pliers 1
B 1U-6683 Ring Expander 1
C 1P-0510 Driver Group 1
NOTICE Keep all parts clean from
contaminants. Contaminants may cause rapid wear
and shortened component life.
32
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Friend! Thank you very much for visiting. Full
manual if required, please enter the following
URL into your browser. https//www.aservicemanual
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