3176 CATERPILLAR ENGINE SERVICE REPAIR MANUAL S7LG - PDF DOWNLOAD

Previous Screen
Shutdown SIS
1087-010
1. Disconnect air line (1). Disconnect air line (2). Remove twelve bolts (3). Remove intake manifold
(4) with gasket.
NOTE: The following steps are for the installation of the air intake manifold.
2. Position the gasket with intake manifold (4). Install twelve bolts (3). Tighten bolts (3) evenly.
3. Connect air line (2). Connect air line (1)
Media Number -SENR5109-01
Copyright 1993 - 2022 Caterpillar Inc.
All Rights Reserved.
Private Network For SIS Licensees.
Product: TRUCK ENGINE
Model: 3176 TRUCK ENGINE 7LG
Configuration: 3176 Truck Engine 7LG00001-07499
Publication Date -01/10/2003
Thu Mar 3 09:36:38 UTC+0530 2022
Date Updated -02/11/2011
SENR51090018
Disassembly and Assembly
3176 DIESEL TRUCK ENGINE DISASSEMBLY & ASSEMBLY
Air Intake Manifold
Remove & Install Air Intake Manifold
SMCS -

Previous Screen
Shutdown SIS
1087-010
1. Disconnect air line (1). Disconnect air line (2). Remove twelve bolts (3). Remove intake manifold
(4) with gasket.
NOTE: The following steps are for the installation of the air intake manifold.
2. Position the gasket with intake manifold (4). Install twelve bolts (3). Tighten bolts (3) evenly.
3. Connect air line (2). Connect air line (1)
Thu Mar 3 09:35:48 UTC+0530 2022
SENR51090018
Air Intake Manifold
Remove & Install Air Intake Manifold
SMCS -

Previous Screen
Shutdown SIS
1059-010
Start By:
a. remove turbocharger
1. Remove bolts (1) and remove manifold (2) with gasket.
NOTE: The following step is for the installation of the exhaust manifold.
NOTE: Apply 5P3931 Anti-Seize Compound to the threads of bolts (1).
2. Position gasket and manifold (2). Install all manifold bolts (1) finger tight, then tighten evenly to a
torque of 55 ± 5 N·m (40 ± 4 lb ft).
End By:
a. install turbocharger
Publication Date -01/10/2003 Date Updated -02/11/2011
SENR51090017
Exhaust Manifold
Remove & Install Exhaust Manifold
SMCS -

Thu Mar 3 09:36:24 UTC+0530 2022

Previous Screen
Shutdown SIS
1052-010; 1052-017
2. Remove four nuts (6). Remove the turbocharger.
NOTE: The following steps are for the installation of the turbocharger.
3. Apply 5P3931 Anti-Seize to turbocharger mounting studs. Position turbocharger gasket and
turbocharger. Install four nuts (6). Tighten nuts to a torque of 55 ± 5 N·m (40 ± 4 lb ft).
1. Remove two bolts (1) and remove oil supply line (2). Remove two bolts (3), loosen hose clamp (4)
and move drain tube (5) out of the way.
SENR51090016
Turbocharger
Remove & Install Turbocharger
SMCS -

2.
3.
Start By:
a. remove turbocharger
Place cartridge assembly (4) in tooling (B).
Loosen clamp (3) and remove cartridge assembly (4).
1. Place turbocharger in tooling (A). Put alignment marks on all the housings. Loosen clamp (1) and
remove housing (2).
4. Position drain tube with gasket and install bolts (3), then tighten hose clamp (4). Position oil supply
line (2) with gasket and install bolts (1).
Disassemble & Assemble Turbocharger

4. Remove nut (5) and remove compressor wheel (6).
5. Remove snap ring (7), then use two screw drivers and remove adapter plate (8). Remove O-ring
seal (9) and inspect.
6. Remove and inspect bushing and seal (10).
7. Remove oil deflector (11) and thrust ring (12).
8. Remove bearing (13), sleeve (14) and thrust ring (15).
9. Lift housing assembly (19) off of shaft and wheel (20).
10. Use snap ring pliers and remove wrap around snap ring (16), then remove double bushing (17).
NOTICE
Use a 5S9566 Sliding T-Wrench and a universal socket to remove nut
(5). Do not bend or add stress to the shaft when nut (5) is loosened or
tightened.

Do not bend or add stress to the shaft when nut (5) is tightened.
18. Install compressor wheel (6) on the shaft. Put one drop of 9S2365 Retaining Compound on the
threads of the shaft. Install nut (5) and torque it to 14.4 ± 0.5 N·m (144 ± 5 lb in).
19. Remove cartridge assembly (4) from tooling (B) and install it into the housing on tooling (A).
Align marks and tighten clamp (3).
20. Install housing (2). Align marks and tighten clamp (1).
End By:
a. install turbocharger
11. Remove seal ring (21) and backplate (18).
12. Check all parts of the turbocharger for damage. If any parts are damaged, use new parts for
replacement. See Special Instructions Form No. SMHS6854 for turbocharger reconditioning. Also,
see Guidelines For Reusable Parts, Form No. SEBF8018.
NOTE: The following steps are for the assembly of the turbocharger.
13. Make sure that all the oil passages in the turbocharger cartridge housing are clean and free of dirt
and foreign material.
NOTE: Do not put oil on any parts of the turbocharger until after the compressor wheel has been
assembled, put clean engine oil into the oil inlet of the turbocharger.
14. With shaft and wheel (20) in tooling (B), install seal (21).
15. Install double bushing (17) into housing (19) and install wrap around snap ring (16). Position
housing assembly (19) onto shaft and wheel (20).
16. Install thrust ring (15), bearing (13), sleeve (14) and thrust ring (12). Install oil deflector (11) then
bushing and seal (10).
17. With oil seal (9) in place, position adapter plate (8) and install snap ring (7).
NOTICE
Thu Mar 3 09:38:57 UTC+0530 2022

Previous Screen
Shutdown SIS
1087-010
(1) Bolts. Apply 5P3931 Anti-Seize Compound to threads.
Tighten to a torque of ... 55 ± 10 N·m (41 ± 7 lb ft)
(2) Studs. Tighten to a torque of ... 35 ± 5 N·m (26 ± 4 lb ft)
Thu Mar 3 09:36:10 UTC+0530 2022
Specifications
3176 DIESEL TRUCK ENGINE SPECIFICATIONS
Exhaust Manifold
SMCS -

Previous Screen
Shutdown SIS
1087-010
(1) End play for shaft (new) ... 0.102 ± 0.025 mm (.004 ± .001 in)
Maximum permissible end play (worn) ... 0.20 mm (.008 in)
(2) Thickness of thrust bearing (where thrust rings contact bearing) ... 5.36 ± 0.03 mm (.211 ± .001 in)
(3) Diameter of shaft (new) ... 12.697 to 12.705 mm (.4999 to .5002 in)
Bore in the bearing (new) ... 12.741 to 12.748 mm (.5016 to .5019 in)
Maximum permissible clearance between bearing and shaft (worn) ... 0.05 mm (.002 in)
Specifications
3176 DIESEL TRUCK ENGINE SPECIFICATIONS
Schwitzer S3B
Turbocharger
SMCS -

(4) Maximum permissible gap of oil seal ring, measured in bore of housing ... 0.25 mm (.010 in)
(5) Install the compressor wheel (at room temperature) as follows:
a. Put compressor wheel on the shaft.
b. Put a small amount of clean engine oil on the threads.
c. Tighten the nut to 14 to 17 N·m (125 to 150 lb in).
d. Remove nut from shaft and apply 6V1541 Quick Cure Primer on the threads of the shaft and nut
followed by application of 9S3263 Retaining Compound.
e. Tighten nut to a torque of ... 24 ± 2 N·m (216 ± 12 lb in)
(6) Thickness of each thrust ring ... 2.553 ± 0.013 mm (.1005 ± .0005 in)
(7) Bore in housing (new) ... 20.744 to 20.757 mm (.8167 to .8172 in)
Outside diameter of the bearing (new) ... 20.630 to 20.643 mm (.8122 to .8127 in)
Maximum permissible clearance between bearing and bore in housing (worn) ... 0.15 mm (.006 in)
Torque for four nuts (put 5P3931 Anti-Seize Compound on threads) and bolts that hold turbocharger
to exhaust manifold ... 55 ± 5 N·m (40 ± 4 lb ft)
Install the band clamps to hold the cartridge to the compressor housing as follows:
a. Tighten clamps to ... 14 ± 1.1 N·m (125 ± 10 lb in)
b. Tap (hit) clamp lightly all around.
c. Tighten again to ... 14 ± 1.1 N·m (125 ± 10 lb in)
NOTE: Put clean engine oil in the oil inlet of the turbocharger after assembly or before installation to
provide start up lubrication and/or storage protection.

Schwitzer S2BG
(1) Clearance between ends of oil seal ring (when installed in bore) ... 0.05 to 0.25 mm (.002 to .010
in)
(2) Apply 5P3931 Anti-Seize Compound to threads of bolts that hold turbine housing to turbocharger.
Tighten to a torque of ... 15.8 ± 0.5 N·m (140 ± 5 lb in)
(3) Tighten bolts that hold compressor housing to turbocharger cartridge to a torque of ... 7.3 ± 0.5
N·m (65 ± 5 lb in)
(4) Compressor wheel installation:
a. Install wheel on shaft.
b. Put 1 drop of 7M7456 Bearing Mount on shaft threads.
c. Tighten nut to a torque of ... 10.2 ± 0.5 N·m (90 ± 5 lb in)
(5) End play for shaft ... 0.051 to 0.083 mm (.0020 to .0033 in)
(6) Apply 5P3931 Anti-Seize Compound. Tighten to a torque of ... 54 ± 5 N·m (40 ± 4 lb ft)
(7) Bore in housing for bearings ... 17.991 to 18.004 mm (.7083 to .7088 in)

Outside diameter of the bearings ... 17.866 to 17.877 mm (.7034 to .7039 in)
(8) Bore in the bearings ... 10.190 to 10.198 mm (.4012 to .4015 in)
Diameter of shaft bearing surface ... 10.152 to 10.160 mm (.3997 to .4000 in)
(9) Clearance between ends of oil seal ring (when installed in bore) ... 0.010 to 0.218 mm (.0004
to .0086 in)
Thu Mar 3 09:38:23 UTC+0530 2022

Previous Screen
Shutdown SIS
1803-010
Disconnect hoses (1), (2), (3) and (4) from compressor.
Remove three mounting nuts (5).
Remove three supporting bolts (6). Pull air compressor out of drive.
The following steps are for installation of the air compressor.
Position the air compressor, engaging drive gear. Install three support bolts (6).
SENR51090007
Air Compressor
Remove & Install Air Compressor
1.
SMCS -
2.
3.
NOTE:
4.

5
.
6
.
Install three mounting nuts (5).
Connect hoses (4), (3), (2) and (1).
Thu Mar 3 09:41:01 UTC+0530 2022

Previous Screen
Shutdown SIS
1209-010
Start By:
a. remove cylinder head
Remove bolts (1) and (2) from cam roller follower group (3).
Remove cam roller follower group (3). Repeat steps for cam roller follower group (4).
Inspect all rocker arm parts for wear or damage.
The following steps are for the installation of the cam roller followers.
SENR51090035
Cam Roller Followers
Remove & Install Cam Roller Followers
SMCS -
1.
2.
3.
NOTE:
Typical Example

NOTE: Be sure pin (5) in the shaft engages the slot in the bracket for proper lubrication oil passage
alignment.
4. Replace worn or failed cam roller follower parts.
5. Install cam roller follower groups (3) and (4).
End By:
a. install cylinder head.
Thu Mar 3 10:05:57 UTC+0530 2022

NOTE: Be sure pin (5) in the shaft engages the slot in the bracket for proper lubrication oil passage
alignment.
4. Replace worn or failed cam roller follower parts.
5. Install cam roller follower groups (3) and (4).
End By:
a. install cylinder head.
Thu Mar 3 09:42:13 UTC+0530 2022

Previous Screen
Shutdown SIS
1210-010; 1212-017
Start By:
a. remove rocker arm assemblies and push
rods b. remove fuel injectors
c. remove front pulley and damper
d. remove front timing cover
e. remove fuel transfer pump
NOTE: Turn the engine to (TDC) top center compression stroke for the No. 1 piston and install
crankshaft flywheel timing pin. This will help when timing the camshaft when installing.
SENR51090039
Camshaft
Remove & Install Camshaft
SMCS -

Remove camshaft retainer bolt (1) and remove camshaft assembly (2).
The following steps are for the installation of the camshaft assembly.
NOTE: It is not necessary to remove the cylinder head. With the cylinder head in place, just wire the
cam roller followers up off the camshaft and then remove the camshaft.
Wire used to hold cam roller followers up off camshaft.
1.
NOTE:

NOTE: When installing the camshaft, rotating it both clockwise and counter clockwise directions will
help prevent it from binding in the bearing bores.
2. Put engine oil on the lobes and journals of the camshaft. Carefully install the camshaft.
NOTE: When installing the camshaft, be sure the number one cylinder is at (TDC) top dead center of
the compression stroke with the timing pin installed in the flywheel. Camshaft timing is very
important. Cam gear timing marks must line up with idler gear timing marks as illustrated. For more
information about timing of engine, refer to Specifications module, Form No. SENR3908.
Typical Example
Camshaft Timing

Start By:
a. remove camshaft assembly
3. With the camshaft properly timed and positioned, install retaining bolt (1). Tighten bolt (1) to a
torque of 48 ± 7 N·m (37 ± 5 lb ft). Remove the wire that was used to hold the cam roller followers
up off the camshaft.
End By:
a. install fuel transfer pump
b. install front cover
c. install front pulley and damper
d. install fuel injectors
e. install rocker arm assemblies and push rods
1. Wrap camshaft portion of camshaft and gear assembly (1) with paper towels to protect the camshaft
from being damaged.
Disassembly & Assembly of Camshaft And Gear Assembly

Place camshaft and gear assembly (1) in a press. Press camshaft (5) from gear (4).
The following steps are for the assembly of the camshaft and the gear assembly.
2. Remove six bolts (2). Remove timing/speed sensor ring gear (3). The timing/speed ring gear is
located on gear (4) by dowel (6).
NOTE: Care must be taken not to damage timing/speed sensor ring gear (3) when removing. Using
the prybar, work around the ring gear and pry the ring gear off a little at a time.
3.
NOTE:
Care must be taken not to allow the camshaft to fall to the floor when
pressing it from the gear. Also be sure that a camshaft lobe does not
catch on the press plates.
NOTICE

5. Align timing gear sensor ring gear (3) with dowel (6). "Front" is marked and visible when installing
timing/speed ring gear sensor.
NOTE: Care must be taken not to damage the timing/speed sensor ring gear when installing. Using a
mallet tap around the ring gear and drive it on a little at a time until it bottoms.
6. Install six bolts (2).
End By:
a. install camshaft assembly
4. To install gear (4) on camshaft (5), place gear in the oven at 300°C (572°F) for 30 minutes and
then install. Be sure the woodruff key is properly aligned and the gear is flush with the camshaft
flange.
Thu Mar 3 09:56:14 UTC+0530 2022

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3176 CATERPILLAR ENGINE SERVICE REPAIR MANUAL S7LG - PDF DOWNLOAD

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