Kohler Command Pro CV980 User Manual download pdf (Page 94)

Section 9

Inspection and Reconditioning

9.2

45°

High Point from

Fillet Intersections

This Fillet Area

Must Be

Completely Smooth

Minimum

The Fillet Must

Blend Smoothly

with the Bearing

Journal Surface

NOTE: If the crankpin is reground, visually check to

ȱȱȱęȱȱ¢ȱȱ

the crankpin surface. See Figure 9-1.

Figure 9-1. Crankpin Fillets.

The connecting rod journal can be ground one size

ǯȱȱȱȱĞǰȱȱȱ

deposits can get caught in the oil passages, which

could cause severe engine damage. Removing the

ȱȱȱȱĞȱȱȱȱ

easy access for removing any grinding deposits that

may collect in the oil passages.

Use the following procedure to remove and replace

the plug.

Procedure to Remove Crankshaft Plug:

1. Drill a 3/16" hole through the plug in the

Ğǯ

2. Thread a 3/4" or 1" long self-tapping screw with a

ĚȱȱȱȱȱǯȱȱĚȱȱ

must be large enough to seat against the shoulder

of the plug bore. See Figure 9-2.

3. Tighten the self-tapping screw until it draws the

ȱȱȱȱĞǯ

Procedure to Install New Plug:

ȱ ŗǯȱ ȱȱȱ¢ȱĞȱǰȱȱȱ

No. 47 380 09-S as a driver and tap the plug into

ȱȱȱȱȱȱȱȱĴȱȱȱ

bore. Make sure the plug is tapped in evenly to

prevent leakage.

Figure 9-2. Removing Crankpin Plug.

Crankcase

Inspection and Service

Check all gasket surfaces to make sure they are free of

gasket fragments. Gasket surfaces must also be free of

deep scratches or nicks.

Inspect the main bearing (if so equipped) for wear or

ȱǻȱȱȱŗǰȱȃęǰȱǰȱ

ȱȱȱȄǼǯȱȱȱȱ

or crankcase using a miniblock or short block as

required.

Check the cylinder bore for scoring. In severe cases,

ȱȱȱȱĜȱȱȱȱȱ

cylinder wall. It washes the necessary lubricating

ȱěȱȱȱȱ¢ȱǯȱȱȱȱ

seeps down the cylinder wall, the piston rings make

metal to metal contact with the wall. Scoring of the

cylinder wall can also be caused by localized hot

ȱȱȱȱȱęȱȱȱ

inadequate or contaminated lubrication.

If the cylinder bore is badly scored, excessively worn,

tapered, or out-of-round, resizing is necessary. Use an

inside micrometer to determine the amount of wear

ǻȱȱȱȃęǰȱǰȱȱȱ

ȱȄǰȱȱȱŗǼǰȱȱȱȱȱ

suitable oversize of either 0.25 mm (0.010 in.) or 0.50

mm (0.020 in.). Resizing to one of these oversizes will

allow usage of the available oversize piston and ring

assemblies. Initially, resize using a boring bar, then

use the following procedures for honing the cylinder.

Honing

While most commercially available cylinder hones

can be used with either portable drills or drill presses,

the use of a low speed drill press is preferred as it

facilitates more accurate alignment of the bore in

ȱȱȱĞȱǯȱȱȱȱ

Flat Washer

Self-Tapping Screw

Plug

Crankshaft

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