Piston and Connecting Rod Assembly Página 1 de 4
001-054 Piston and Connecting Rod Assembly
Install
The cylinder block and all parts must be clean before assembly. Inspect the
cylinder walls of the cylinder block, if out of specification. Refer to Procedure
001-026 in Section 1.
Use a clean, lint-free cloth to clean the connecting rods and bearing shells.
If new bearings are not used, the used bearings must be installed on the
same connecting rod and location from where they were removed.
Make sure the connecting rod and back surface of the connecting rod bearing
surfaces are clean and free of debris. Do not lubricate the back surface of the
connecting rod bearings.
Install the upper bearing shell into the connecting rod.
The tang of the bearing shell must be in the slot of the rod. The end of the
bearing shell must be even with the cap mounting surface.
NOTE: The upper and lower rod bearing shells are not interchangeable
on fracture split connecting rods.
Use assembly lube, Part Number 3163087, or equivalent, to coat the inside
circumference of the bearing shell.
Apply a film of clean 15W-40 oil to the cylinder block wall.
Lubricate the rings and piston skirts with clean engine lubricating oil.
Rotate the rings to position the ring gaps as shown.
mk:@MSITStore:C:\Users\alberto\Desktop\cummins2012\MR_D.CHM::/english/pro... 14/03/2013
Piston and Connecting Rod Assembly Página 2 de 4
The ring gap of each ring must not be aligned with the piston pin, or with any
other ring. If the ring gaps are not aligned correctly, the rings will not seal
properly.
Use piston ring compressor, Part Number 4918294, to compress the rings.
Rotate the crankshaft so the connecting rod journal of the connecting rod being
installed is at bottom dead center.
CAUTION
Failure to follow this step will result in extensive engine damage.
NOTE: The piston and connecting rod assembly must be installed with
the correct orientation.
Align the “Front” marking and/or arrow on the top of the piston so that it points
towards the front of the engine. Insert the connecting rod through the cylinder
bore until the ring compressor contacts the top of the cylinder block.
The long end of the connecting rod (1) and the notch in the piston skirt (2) will
be on the exhaust side of the engine. If not, verify the piston is installed
correctly onto the connecting rod.
Hold the ring compressor against the cylinder block.
Push the piston through the ring compressor and into the cylinder bore.
Push the piston until the top ring is completely in the cylinder bore.
NOTE: If the piston does not move freely, remove the piston and inspect
for broken or damaged rings.
mk:@MSITStore:C:\Users\alberto\Desktop\cummins2012\MR_D.CHM::/english/pro... 14/03/2013
Piston and Connecting Rod Assembly Página 3 de 4
Carefully push the piston into the bore while guiding the connecting rod to the
crankshaft journal.
NOTE: If new bearings are not used, the used bearings must be installed
on the same connecting rod cap from which they were removed.
Install the bearing in the connecting rod cap.
The tang of the bearing (2) must be in the slot of the cap (1).
Use assembly lube, Part Number 3163087, or equivalent, to coat the inside
diameter of the bearing shell.
Use clean 15W-40 oil to lubricate the connecting rod capscrew threads and
the underside of the connecting rod capscrew head.
CAUTION
Do not damage the fractured split surface on the connecting rod or
connecting rod cap while the connecting rod cap is removed. If the
fractured split surface is damaged, the connecting rod and connecting rod
cap must be replaced to help reduce the possibility of engine damage.
The connecting rod and cap must have the same number and must be
installed in the proper cylinder. The connecting rod cap number and rod
number must be on the same side of the connecting rod to prevent engine
damage during engine operation.
Install the connecting rod cap and capscrews.
Use a marked socket and torque wrench to tighten the rod capscrews.
Use the torque plus angle method to tighten the connecting rod capscrews in
alternating sequence.
Torque Value:
1. 60 n.m [44 ft-lb]
2. Rotate 60 degrees clockwise
Measure the side clearance between the connecting rod and crankshaft.
Do not measure the clearance between the rod cap and crankshaft.
Connecting Rod and Crankshaft Side Clearance
mm in
0.10 MIN 0.004
0.33 MAX 0.013
mk:@MSITStore:C:\Users\alberto\Desktop\cummins2012\MR_D.CHM::/english/pro... 14/03/2013
Piston and Connecting Rod Assembly Página 4 de 4
Measure piston protrusion above the cylinder block combustion deck.
NOTE: This procedure is only required after a piston, crankshaft, connecting
rod, or block modification/replacement.
Measure the piston protrusion with depth gauge assembly Part Number 3164438.
Piston or head gasket grading is not required.
Install the dial indicator on the cylinder head mating surface and zero the gauge.
Move the dial indicator directly over the piston pin to eliminate any side-to-side
movement. Do not place the indicator tip on the anodized area.
Rotate the crankshaft to top dead center. Rotate the crankshaft clockwise and
counterclockwise to find the highest dial indicator reading. Record the reading.
Piston Protrusion
mm in
0.151 MIN 0.006
0.485 MAX 0.019
If the piston protrusion is not within specification, verify that the correct parts are
installed and/or the cylinder block combustion deck has been machined improperly.
Refer to Procedure 001-026 in Section 1.
Check for freedom of rotation as the connecting rod caps are installed. If the
crankshaft does not rotate freely, check the installation of the connecting rod
bearings and the bearing size.
Last Modified: 05-May-2011
Copyright © 2000-2010 Cummins Inc. All rights reserved.
mk:@MSITStore:C:\Users\alberto\Desktop\cummins2012\MR_D.CHM::/english/pro... 14/03/2013
