TABLE OF SPECIFICATIONS, NEW CLEARANCES AND WEAR LIMITS

TABLE OF SPECIFICATIONS, NEW CLEARANCES AND WEAR LIMITS - Continued

Technical Manual For Mixer, Rotary Tiller, Soil Stabilization Diesel Engine Driven (Ded) Page Navigation
277

TM 5-3895-359-14&P

ENGINE PARTS (Standard Size, New)

MINIMUM

MAXIMUM

LIMITS

Cross-Head Pistons and Rings

71N Engines

Piston crown:

Saddle-to-crown distance:

N piston (18.7:1 compr. ratio) ................................................

2.7030"

2.7100"

Diameter:

At top .....................................................................................

4.2226"

4.2256"

Below both compression rings ................................................

4.2391"

4.2421"

Above and below seal ring groove..........................................

3.8850"

3.8950"

Above and below bearing saddle............................................

3.2360"

3.2370"

Compression rings:

Gap (top-fire ring) .......................................................................

.0230"

.0380"

.0600"

Gap (No. 2 and 3) ......................................................................

.0180"

.0430"

.0600"

Clearance-ring-to-groove:

*Top (Keystone fire ring) ....................................................... .

.0010"

.0050"

.0070"

No. 2 (rectangular section) ....................................................

.0100"

.0130"

.0220"

No. 3 (rectangular section) ....................................................

.0040"

.0070"

.0130"

Seal ring:

Gap (in skirt counterbore) ...........................................................

.0020"

.0210"

.0270"

Clearance ...................................................................................

.0005"

.0030"

.0040"

Piston skirt:

Diameter ...................................................................................

4.2428"

4.2450"

Clearance-skirt-to-liner................................................................

.0045"

.0083"

.0120"

Seal ring bore .............................................................................

3.9200"

3.9240"

3.9260"

Piston pin bore............................................................................

1.5000"

1.5030"

1.5040"

Oil control rings:

Gap (two rings in lower groove)...................................................

.0080"

.0230"

.0430"

Gap (two rings in upper groove) ..................................................

.0080"

.0230"

.0430"

Clearance (lower groove)............................................................

.0015"

.0055"

.0080"

Clearance (upper groove) ...........................................................

.0010"

.0035"

.0060"

*Measured with Keystone fire ring flush with outside diameter of piston crown.

Diameter above and below the piston pin may be 4.2414".

10-2-134

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