C15 On-highway RENR3977
September 2004
Truck Engine Engine Design
C15 On-highway Bore
Stroke
137.2 mm (4.40 inch)
171.45 mm (6.75inch)
Truck Engine Number of Cylinders
Cylinder Arrangement
6
*in-Line
Firing Order (Injection Sequence) 1, 5, 3, 6, 2, 4
Direction of Rotation
(Viewed from flywheel end) Counterclockwise
*The No. 1 cylinder is the front cylinder.
Repair Determination Procedure
Lower End Inspection v
Q6 Remove the oil filters and cut them open to examine for
Q- Denotes Critical Checkpoint foreign material contamination, damage, or plugging.
Cut open the oil filters with the 5P-1747 Cutter Tool.
Tools Required The filter is contaminated, damaged, __Yes
Part No. Description or plugged. __No
2P-5518 Bearing Tool Q7 Remove the oil pan and examine the bottom of the oil
pan for foreign material.
2P-8250 Strap Wrench
Foreign material __ Yes
5P-1747 Cutter Tool __ No
8 Remove the suction bell, oil supply tube, oil pump and
Literature References underframe assembly.
Form No. Title 9 Number all of the main bearing caps, connecting rods
and connecting rod caps.
SEBV0544 Engine Bearings
Q 10 Rotate the crankshaft until two rod journals are at the
Guideline for Reusable Parts lowest position. Remove the two rod caps. Inspect the
SEBF8009 Main and Connecting Rod Bearings bearings according to SEBF8009. Visually inspect the
crankshaft journals for damage or unusual wear. Refer
SEBF8043 Visual Inspection of Crankshafts to SEBF8043. Reinstall the rod caps. Repeat this
Procedure Chart procedure until all rod journals and rod bearings have
been inspected.
RENR3975 In-Frame Overhaul Procedure
Crankshaft damage __ Yes
Service Manual __ No
SENR9695 C15 On-Highway Engine Service Manual (BXS) Note: If step 10 is NO, proceed to Step 11.
If step 10 is YES, stop here. The engine must be removed
from the vehicle.
Q 11 Loosen the crankshaft pulley belts. Remove the
Initial Disassembly and Inspection following main bearing caps; 2, 3, 4, 5 and 6. Use the
2P-5518 Bearing Tool to remove and install all of the
Note: EXTRA ATTENTION should be given to upper main bearings. Inspect the bearings and
crankshaft journals as mentioned in step 10. Inspect the
cleanliness, as built in dirt is a major cause of bearing bore in the cylinder block and the caps for
failure following rebuild. damage. Replace the number 2 main bearing and the
number 6 main bearings, caps and bolts. Remove the
v number 1 and the number 7 main bearing caps. Inspect
Steps Procedures all critical areas as mentioned above. Replace the
bearings, caps and bolts.
1 Steam clean the engine.
Crankshaft damage __Yes
Q2 Disconnect the batteries. __ No
Q3 Remove the air cleaner and piping. Inspect the Cylinder Block Damage __ Yes
turbocharger inlet for indications of abrasive dirt __ No
entry. Note: If both inspections in step 11 are NO, proceed to step 12.
Note: Dirt or indications of abrasive dirt entry may be found at the If either inspection in step 11 is yes, stop here. The engine
turbocharger inlet. This is an indication of possible accelerated must be removed from the vehicle.
wear and/or damage. The following components may be
damaged; the turbocharger, cylinder walls, pistons, rings,
bearings, and others. Cylinder head removal will be necessary
to determine the extent of the wear or damage. If the
turbocharger inlet and inlet piping are clean, it may not be Repair Determination
necessary to remove the cylinder head.
12 If answers to steps 10 and 11 are NO, the engine may
4 Drain the engine oil. be repaired in-frame.
5 Drain the coolant.
If a complete in-frame overhaul is to be performed, refer
to the In-Frame Overhaul Procedure Wall Chart,
RENR3975 and begin with step 5.
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©2004 Caterpillar Inc.
All Rights Reserved Printed in U.S.A.
