3991488 — PISTON,INTERNAL COMBUSTION ENGIN

✓ Government record, cited

— · COMPONENT

PRODUCT OVERVIEW

3991488: PISTON,INTERNAL COMBUSTION ENGIN.

PISTON,INTERNAL COMBUSTION ENGIN. Key specifications include weight: 21.0 OUNCES OZ, diameter: 4.000 INCHES NOMINAL IN, material: ALUMINUM ALLOY, cut_depth: 0.970 INCHES NOMINAL IN, head_style: CONCAVE, oil_groove: INCLUDED. This part is cataloged in the U.S.

Government catalog under NSN 2805-00-757-4107, indicating validated use in U.S. government and defense logistics supply chains. Available through authorized enterprise resellers and TPM (Third Party Maintenance) channels.

Verify compatibility with your specific system configuration before ordering.

WHERE IT FITS

3991488

NSN: 2805-00-757-4107
FSC: 2805 — Gasoline Reciprocating Engines, Except Aircraft; and Components
CAGE: 23862 — MILITARY VEHICLES OPN GENERAL MOTORS TRUCK AND BUS GROUP MS 2603-02 (USA)

SPECIFICATIONS

weight	21.0 OUNCES OZ
diameter	4.000 INCHES NOMINAL IN
material	ALUMINUM ALLOY
cut_depth	0.970 INCHES NOMINAL IN
head_style	CONCAVE
oil_groove	INCLUDED
skirt_type	SOLID
carbon_groove	NOT INCLUDED
overall_height	3.190 INCHES NOMINAL IN
surface_finish	FINISHED
oil_passage_type	HOLE LOCATION NOT OTHERWISE SPECIFIED
pin_hole_bushing	NOT INCLUDED
NSN	2805-00-757-4107

COMPONENT DIAGRAM

KEY FEATURES

•

CARBON GROOVE: NOT INCLUDED

•

RING GROOVE WIDTH: 0.1880 INCHES MINIMUM AND 0.1890 INCHES MAXIMUM THIRD RING IN

•

DISTANCE BETWEEN PIN BOSSES: 1.140 INCHES NOMINAL IN

•

RETAINING RING GROOVE: NOT INCLUDED

•

SURFACE FINISH: FINISHED

TECHNICAL CHARACTERISTICS

OVERALL HEIGHT	3.190 INCHES NOMINAL IN
CARBON GROOVE	NOT INCLUDED
RING GROOVE WIDTH	0.1880 INCHES MINIMUM AND 0.1890 INCHES MAXIMUM THIRD RING IN
RING GROOVE WIDTH	0.0790 INCHES MINIMUM AND 0.0800 INCHES MAXIMUM FIRST RING IN
RING GROOVE WIDTH	0.0790 INCHES MINIMUM AND 0.0800 INCHES MAXIMUM SECOND RING IN
DISTANCE BETWEEN PIN BOSSES	1.140 INCHES NOMINAL IN
RETAINING RING GROOVE	NOT INCLUDED
SURFACE FINISH	FINISHED
OIL PASSAGE TYPE	HOLE LOCATION NOT OTHERWISE SPECIFIED
DIAMETER	4.000 INCHES NOMINAL IN

SUBSTITUTES & CROSS-REFERENCES 1

423PSame NSN cross-reference

Same NSN cross-reference

Also cataloged under this NSN

LIFECYCLE

NSN statusActive· U.S. Government catalog

Acquisition advice: Normally procured from the manufacturer (OEM)No demilitarization required

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FREQUENTLY ASKED QUESTIONS

What is 3991488?

3991488 is a PISTON,INTERNAL COMBUSTION ENGIN.

What parts can replace 3991488?

There is 1 known substitute for 3991488: 423P. Substitute compatibility should be verified for your specific system.

What is the NSN for 3991488?

3991488 is cataloged in the U.S. Government catalog under NSN 2805-00-757-4107. This indicates validated use in U.S. government and defense supply chains.

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3991488 — PISTON,INTERNAL COMBUSTION ENGIN

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