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12 01-15

SUBJECT

DATE

Crankshaft and Bearings

December 2015

Additions, Revisions, or Updates
Publication Number / Title

DDC-SVC-MAN-0081
DDC-SVC-MAN-0181

Platform

EPA07/10/
GHG14
Euro IV

Section Title

Change

Description and
Operation of the
Crankshaft

Changed title and made minor terminology improvements.

Removal of the
Crankshaft

Added step regarding removing engine accessories and mounting
engine to a stand.
Added notice regarding removal of connecting rod bearing caps.

Inspection of the
Crankshaft

Made several improvements.

Installation of the
Crankshaft

Added notice regarding debris during installation.
Added main cap bolt measurement step.

Inspection of the Main
and Connecting Rod
Bearings in Chassis

Made several improvements.

All information subject to change without notice.

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Copyright © 2016 DETROIT DIESEL CORPORATION

3

2 Description and Operation of the Crankshaft

2

Description and Operation of the Crankshaft

The crankshaft is made out of induction-hardened steel. The crankshaft bearing journals and connecting rod journals are
hardened in the boundary layer and then ground. In order to avoid vibrations, counterweights are cast onto the guide-ways.
The crankshaft is mounted with seven crankshaft main bearing journals in the cylinder block. There are oil holes located at
the crankshaft main bearing journal and the connecting rod journal for lubrication.

1. Crankshaft Main Bearing Journals
2. Connecting Rod Bearing Journals

3. Counterweights (Number Varies By Engine Model)
4. Arrows Show Lubricating Oil Passage Locations

Figure 1. Crankshaft

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All information subject to change without notice.

Copyright © 2016 DETROIT DIESEL CORPORATION

12 01-15

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1.
2.
3.
4.
5.
6.

Bolt
Main Bearing Caps
Lower Crankshaft Main Bearing Shells
Lower Connecting Rod Bearing Shells
Upper Connecting Rod Bearing Shells
Cylinder Block

7.
8.
9.
10.
11.

Vibration Damper
Upper Crankshaft Main Bearing Shells
Thrust Washer
Crankshaft
Thrust Washer

Figure 2. Crankshaft with Four Counterweights used in DD13 Engines (All), DD15 Engines (Later EPA10
and all GHG14), and DD16 Engines (Later EPA10 and all GHG14)

All information subject to change without notice.

12 01-15

Copyright © 2016 DETROIT DIESEL CORPORATION

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2 Description and Operation of the Crankshaft

1.
2.
3.
4.
5.

Bolt
Vibration Damper
Cover Plate
Crankshaft Main Bearings
Connecting Rod Bearings

6.
7.
8.
9.
10.

Thrust Washer
Bolt
Flywheel
Ring Gear
Crankshaft

Figure 3. Crankshaft with Eight Counterweights used in all EPA07 and Early EPA10 DD15 and DD16
Engines

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All information subject to change without notice.

Copyright © 2016 DETROIT DIESEL CORPORATION

12 01-15

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Removal of the Crankshaft

This procedure requires removal of the engine from the chassis. Refer to section "Removal of the Complete Powertrain
Assembly".
Remove as follows:
WARNING: FALLING ENGINE
To avoid injury from a falling engine, ensure the engine is securely attached to the engine overhaul
stand before releasing the lifting sling.
1. Remove all of the accessories and assemblies to allow a suitable, properly rated cylinder block adaptor to be bolted to
the cylinder block. Mount the adaptor and engine to a suitable, properly rated engine stand.
2. Remove the oil pan. Refer to section "Removal of the Oil Pan".
3. Remove the oil pump, oil suction manifold, and oil lines. Refer to section "Removal of the Oil Pump, Oil Suction
Manifold, and Oil Lines".
4. Remove the flywheel. Refer to section "Removal of the Flywheel".
5. Remove the flywheel housing. Refer to section "Removal of the Flywheel Housing".
6. Remove idler gear No. 1 and idler gear No. 4, if equipped.
NOTICE: Use care when removing the vibration damper. If the damper is allowed to fall, damage to the internal
components of the damper may result.
7. Loosen and remove two of the vibration damper mounting bolts 180 degrees apart and install flywheel guide studs
(J-36235) in their place. Then loosen and remove the remaining six mounting bolts.
8. Remove the vibration damper.
9. Remove the front engine cover.
NOTICE: Paint-mark the connecting rod bearing caps for position so they can be installed to their respective
connecting rods.
NOTICE: The connecting rod assembly is a cracked rod design. When removed, ensure that the connecting rod
bearing cap is placed on its side. Damage to the connecting rod bearing cap will occur if it is placed on end. The
connecting rod assembly will need to be replaced if the connecting rod bearing cap is damaged.
10. Remove all six connecting rod bearing caps. Discard the bolts.
11. Remove connecting rod and piston assemblies, if necessary. Refer to section "Removal of the Piston and Connecting
Rod Assembly".
NOTICE: Paint-mark the main bearing caps so that they can be installed to their respective, original positions.
The main bearing caps must be kept in sequence.
12.
13.
14.
15.
16.

Loosen and remove the main bearing cap bolts.
Using the appropriate main bearing cap puller tool, remove the main bearing caps.
Remove the thrust washers from each side of the No. 6 main bearing cap.
Using an appropriately rated lifting device, carefully remove the crankshaft.
Remove the crankshaft gear and place the crankshaft on a suitable surface.

All information subject to change without notice.

12 01-15

Copyright © 2016 DETROIT DIESEL CORPORATION

7

4 Inspection of the Crankshaft

4

Inspection of the Crankshaft

Inspect as follows:
1. Clean out the oil passages thoroughly with a stiff wire brush.
2. Clean the crankshaft with a suitable degreaser and solvent.
WARNING: EYE INJURY
To avoid injury from flying debris when using compressed air, wear adequate eye protection (face
shield or safety goggles) and do not exceed 276 kPa (40 psi) air pressure.
3. Dry the crankshaft with compressed air.
4. Inspect the crankshaft journals, flanges and counterweights for cracks. Replace the crankshaft if cracks are found.
NOTE: Light scratching or visible marks on the crankshaft journals is considered normal wear.
5. Inspect the crankshaft journals for excessive scoring that can be felt with a fingernail. Replace the crankshaft if
excessive scoring is found.
6. Inspect the front crankshaft oil seal contact surface for scoring that can be felt with a fingernail. Replace the crankshaft
if the sealing surface is damaged to the point of causing an oil leak.
NOTE: Excessive wear at the crankshaft thrust surfaces can be caused by improper transmission clutch
adjustment.
7. Check the crankshaft thrust surfaces for excessive wear. If excessively worn, replace the crankshaft.
8. Measure crankshaft main journal run-out. Replace as necessary.
• Set main journals number 1 and number 7 on a pair of non-marring V-blocks
• Rotate crankshaft and carefully measure main journals with a dial indicator. Record the results. The maximum is
shown below.
Table 1.
Journal 1
On V-block

Journal 2

Journal 3

Journal 4

Journal 5

Journal 6

0.040 mm

0.060 mm

0.090 mm

0.060 mm

0.040 mm

(0.0015 in.)

(0.0024 in.)

(0.0035 in.)

(0.0024 in.)

(0.0015 in.)

Journal 7
On V-block

9. Clean and inspect bolt holes in crankshaft for the flywheel and vibration damper mounting bolts. Check for damaged
threads. Repair as necessary.
10. Measure the main cap bolts for reuse. The maximum allowable length is listed below.
Table 2.
Main Bearing Cap Bolt

DD13

DD15

DD16

175.5 mm (6.909 in.)

200.5 mm (7.894 in.)

200.5 mm (7.894 in.)

11. Inspect the cylinder block main journals for damage. Repair as necessary.
12. If the crankshaft is reusable but will not be installed the same day, coat the crankshaft and main journals of the cylinder
block with a rust prevention solution such as fogging oil.

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All information subject to change without notice.

Copyright © 2016 DETROIT DIESEL CORPORATION

12 01-15