manua de servicio para motor cummins c gas plus

7/22/2019 Manua de Servicio Para Motor Cummins c Gas Plus

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01-005 Bearings, Connecting Rod

Table of Contents

General InformationPreparatory Steps

Remove

Clean and Inspect for Reuse

Install

Finishing Steps

General Information TOC

The connecting rod bearings are a trimetaldesign with a steel backing.

SMALL| MEDIUM|LARGE

Next

Improper maintenance of the lubricationsystem is the primary cause of reduced

bearing life.

An oil analysis will aid in determining

the extent of internal enginedamage.Refer to Procedure 007-083 in

Section 7 for more information.ForSMALL| MEDIUM|LARGE
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additional oil analysis, refer toCummins Engine Oil and Oil Analysis

Recommendations, Bulletin 3810340.

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Normally, worn bearings can be detected byreduced oil pressure, but if this wear goes

undetected, the excessive clearance will

increase the impact between the bearing andcrankshaft, causing a distinct knocking

sound.

SMALL| MEDIUM| LARGE

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A connecting rod noise occurs when the

engine is notloaded. Verify by firstapplying a load and then unloading and

listening for the noise.


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The connecting rod bearing shells are

identified by steel-stamped characters on

the back of the bearings. The characters

indicate either standard (STD) or theamount oversize (OS).

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Preparatory Steps TOC

WARNING

To reduce the possibility of personal

injury, avoid direct contact of hot oilwith your skin.

WARNING

Batteries can emit explosive gases. To

reduce the possibility of personalinjury, always ventilate the

compartment before servicing the

batteries. To reduce the possibility of

arcing, remove the negative (-) batterycable first and attach the negative (-)

battery cable last.

WARNING

Some state and federal agencies have

determined that used engine oil can be

carcinogenic and cause reproductive

toxicity. Avoid inhalation of vapors,

SMALL| MEDIUM|LARGE

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ingestion, and prolonged contact with

used engine oil.

Close the fuel supply valve.Refer to the OEM instructions.

Disconnect the batteries. Refer tothe OEM service manual.

Drain the lubricating oil.Refer toProcedure 007-037 in Section 7.

Remove the lubricating oil panand gasket.Refer to Procedure007-025 in Section 7.

Remove the oil suctiontube.Refer to Procedure 007-035

in Section 7.

Remove TOC

Rotate the crankshaft, using the enginebarring gear, Part Number 3377371, to

position two of the connecting rods atbottom dead center.

SMALL| MEDIUM|LARGE

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Loosen the connecting rod capscrew nuts.

Do notremove the capscrew nuts.

Hit the connecting rod capscrew nuts with a

plastic hammer to loosen the rod caps.


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CAUTION

The connecting rod bearings must beinstalled in the same location they

were removed from if they are reused.

Failure to install the connecting rodbearings in the same location will

cause engine damage.

Remove the connecting rod capscrew

nuts and rod cap.

Remove the bearing shell from the rod

cap, and mark it as the lower bearingshell from the connecting rod number

from where it was removed.


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Push the connecting rod up far enough toallow the upper bearing shell to be

removed.

Remove the bearing shell, and mark it as

the upper bearing shell and theconnecting rod number from where itwas removed.


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Clean and Inspect for Reuse TOC

WARNING

When using solvents, acids, oralkaline materials for cleaning, follow

the manufacturer's recommendations

for use. Wear goggles and protectiveclothing to reduce the possibility of

personal injury.

WARNING

Some solvents are flammable and

toxic. Read the manufacturer's

instructions before using.


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WARNING

Wear appropriate eye and faceprotection when using compressed air.

Flying debris and dirt can causepersonal injury.

Use solvent and a soft bristle brush or asteam cleaner to clean the cap,

capscrews, and bearings.

Dry the connecting rod cap, bearings,

and capscrews with compressed air.

Inspect the connecting rod caps,

connecting rod bearing saddles, and

capscrews for nicks, cracks, burrs,scratches, or fretting.


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Inspect the bearings for damage. Refer tothe Parts Reuse Guidelines, Bulletin

3810303, for information on bearing

inspection.

Replace any bearings with lock tangdamage or scratches deep enough to be

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felt with a fingernail.

Replace any bearings that show pitting,flaking, or corrosion into the lining.

NOTE: If bearings are damaged,

they must be replaced as a set.

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NOTE: Normal bearing wear

produces a smooth finish that will

wear into the lining. An exposed lining

does not always indicate worn

bearings. If large areas of the lining

are visible in the bearings before the

engine has accumulated 240,000 km[150,000 mi] or 3750 hours, inspect the

engine for contamination from fine

dirt particles, and correct the

problem.


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Inspect the crankshaft rod

journals.Refer to Procedure 001-006 in

Section 1.


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Inspect the bearing shell seating surfacefor nicks or burrs.

If nicks or burrs can notbe removed

with Scotch-Brite 7448, Part Number

3823258, the bearings mustbe replaced.

NOTE: For more detailed information

on bearing damage, refer to Analysis

and Prevention of Bearing Failures,

Bulletin 3810387.


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Measure the rod bearing shell thickness

with an outside micrometer that has aball tip.

Standard Connecting Rod BearingThickness (Used)

mm in

2.43 MIN 0.096

2.47 MAX 0.097

The bearing mustbe replaced if it isbelow the minimum specification.


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NOTE: Connecting rod bearings are

identified with a part number and size

stamped on the back.

Determine the size of the removed rod

bearing and obtain a set of newconnecting rod bearings the same size.

NOTE: Oversize service rod bearings

are available for use with crankshafts

that have been machined undersize.

See the appropriate parts catalog.


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Crankshafts that are machined undersizein the connecting rod or main bearing

journals are marked on the front

counterweight. If the crankshaft is

marked, check the bearing shell part

number to make sure the correct bearingsize is used.

Bearing shells are identified by steel-

stamped characters on the back of thebearings to indicate either standard

(STD) or amount oversize (OS).


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Install TOC

CAUTION

The connecting rod bearings must beinstalled in the same location theywere removed from if they are reused.

Failure to install the connecting rod

bearings in the same location willcause engine damage.

Use clean engine oil to lubricate thecrankshaft journal mating surface of the

upper bearing shell.

Install the upper bearing shell in theconnecting rod with the tang of the

bearing in the slot of the rod.

Pull the connecting rod against the


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crankshaft to hold the bearing in place.

Install the bearing shell in the connecting

rod cap with the tang (2) of the bearing

in the slot (1) of the cap.

Use clean engine oil to lubricate the

bearing shell to crankshaft journal

mating surface.

Use clean engine oil to lubricate the

threads of the connecting rod capscrews.


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NOTE: Unique serial numbers

(not cylinder numbers) are stamped

on the connecting rod and matching

connecting rod cap.

When the connecting rods andconnecting rod caps are installed in the

engine, the numbers on the connectingrods and connecting rod caps mustmatchand be installed on the same side of the

engine.


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CAUTION

The connecting rod cap number mustmatch the number on the connecting

rod and must be installed with theSMALL| MEDIUM| LARGE
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numbers aligned to prevent damage to

the connecting rods and thecrankshaft. The locking tang of the

connecting rod cap must be toward

the camshaft side of the cylinderblock.

Lubricate under the connecting rod

capscrew nuts with clean engine oil.

Install the connecting rod caps and rod

capscrew nuts.

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Tighten the connecting rod capscrewnuts in alternating sequence.

Torque Value:

1. 30 n.m [22 ft-lb]2. 70 n.m [52 ft-lb]3. 60 turn


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Measure the side clearance between the

connecting rod and crankshaft.

Connecting Rod Side Clearance

mm in

0.10 MIN 0.004

0.33 MAX 0.013 SMALL| MEDIUM| LARGE

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NOTE: The crankshaft must rotate

freely.

Check for freedom of rotation as the caps

are installed. If the crankshaft

does notrotate freely, check theinstallation of the rod bearings and thebearing size.


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Finishing Steps TOC

Install the oil suction tube.Referto Procedure 007-035 in Section

7.

Install the lubricating oilpan.Refer to Procedure 007-025

in Section 7. Fill the oil pan with clean engine

oil.Refer to Procedure 007-037

in Section 7.

Connect the batteries. Refer tothe OEM service manual.

Open the fuel supply valve. Referto the OEM instructions.

Operate the engine until thecoolant temperature reaches82C [180F], and check for

leaks and proper operation.


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