Clark G127E Service-Handbuch - Seite 6

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Group 00, Engine

CLCIRK

Main bearing and connecting rod bearing

1) Visually inspect the bearings for breaking away,

melting, seizing and improper contact. If any damage

is found, replace the bearings.

2) Check the oil clearances to the crankshaft journals

and pins.

Install the bearing caps and tighten the cap bolts to the

specified torque. Measure inside diameter (ID)of each

bearing in two directions A and B at the front and rear

ends of the bearing.

Compare these measurementswith the measurements

of the journals and pins (see previous section) to

determine the oil clearances. Each clearance is calcu-

lated by subtracting journal or pin OD from ID of the

installed bearing. If any clearance is outside the limit,

the fault must be corrected before reassembly.

BEARING OIL CLEARANCE

Description

Specification

Repair limit

Journal/Main brg. oil

[0,020-0,080]

[0,15]

clearance: [mm] in.

.0008-.0031

.006

(Center bearing)

Pin/Corm. rod brg.

[0,014-0,064]

[O,lO]

oil clearance: [mm] in.

.0005-.0025

.004

Main brg. cap bolt

[73.6-83.41

torque: [N.m] Ibf.ft.

54-61

Connecting. rod cap

[44.1-47.11

bolt torque: [N.m] Ibf.ft.

32-35

NOTE

*When installing a new crankshaft, use

the standard-size bearings.

-When a clearance does not fall into the

specified range even after replacing the

bearing, grind the journal or pin to the

next undersize and install the correct

bearing of same undersize.

OIL CLEARANCE

- ALTERNATE

METHOD

Oil clearances also may be checked with a Plastigage

using the following procedure:

1. Clean to remove oil and dust from the bearings and

journals to be checked.

2. Cut down the Plastigage strip to the same length as

the width of bearing.

Put the strip into the journal

bearing cap, taking care not to pass the oil hole.

3. Install the crankshaft, bearings and caps. Tighten the

main bearing bolts to the specified torque. Be careful

not to rotate the crankshaft.

Remove the cap and

measure the amount of flattening (the maximum width)

of the gage with a special scale supplied with the

Plastigage.

Crankshaft sprocket

1) Check the crankshaft sprocket teeth fordamage and

wear. If damaged, replace the sprocket.

Flywheel and ring gear

1) Check the flywheel for any evidence of damage.

Look for evidence of cracks or corrosion. If damaged,

replace the flywheel.

2) Inspect the ring gear for damage, cracks and wear of

the teeth or evidence of improper seating of ring gear.

If damaged, replace the ring gear.

3) Ring gear replacement procedure

When removing the ring gear, use a hammer to tap

lightly around the side face of the ring gear until it comes

off the flywheel.

Do not heat the ring gear when

removing it.

When installing a new ring gear, heat the ring gear to

[260"-28O"C] 500"-536°F and shrink-fit it to the

flywheel.

00-2-34

Engine

SM 619, Jan '98