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Komatsu 6D140 NPR Piston Rings Diesel Engine Accessories 6211-31-2031

Basic Information
Place of Origin: JAPAN
Brand Name: NPR
Model Number: 6D140
Minimum Order Quantity: 1 SET
Price: usd+15+CYL
Packaging Details: CARTON
Delivery Time: 2-5days
Payment Terms: T/T
Supply Ability: 100 SETS
Detail Information
Type:: Piston Ring Brand Name :: NPR
Place Of Origin:: JAPAN Condition:: New, 100%new
OEM No:: 6211-31-2031 NPR Catalog Code:: YDK04028ZZ
Reference:: 6211-31-2031 Make :: Komatsu
Engine Model:: 6D140 Cyl No. :: 6
SET/CYL:: CYL Delivery Time:: 2-5days
Cylinder Diameter: 140.0mm Exhaust Quantity: 15,240C.C
High Light:

6D140 NPR Piston Rings


6211-31-2031 NPR Piston Rings

Product Description

Komatsu 6D140 piston ring diesel engine accessories 6211-31-2031​




Engine Type Exhaust quantity
Vehicle Model Chassis Type NPR Catalog Code Cyl No. Position Size(mm) Shape Mate rial Surface
d 1 (D) h 1 (B) a 1
Outside Upper /Lower
6D140 15,240 Generator YDK04028ZZ 6 1st 140.0 2.4 5.4 BF-K1 HB Cr Fe 6211-31-2031
2nd 140.0 2.4 5.4 T1-K1-IC HB Cr Fe
Oil 140.0 4 4.15 E-BC16 SR Cr Fe



1. This product is a direct injection engine piston ring accessory for Komatsu 6D140 model;


2. This model of direct injection engine and electronic injection engine have different ring sizes, and it is necessary to distinguish them clearly when selecting the product;


3. Choosing specific products based on OEM No is the best method



Komatsu 6D140 NPR Piston Rings Diesel Engine Accessories 6211-31-2031 0


NPR PISTON RING SET Fitting Instruction

I. Install piston rings in the following order:

1,Thoroughly clean ring grooves of piston.

2,Fit the oil control -followed by compression rings in ascending order,into the ring grooves using a ring tool.

3, Take care to fit the rings with marked faces upward and toward top of the piston.

II.Confirmation that rings are fitted correctly:

1,Make sure rings can be moved freely - without jamming-in the piston grooves.

2,Make sure each ring gap is not positioned in line with piston pin axis or thrust

III.Installation of piston fitted with rings:

Always use an installation tool when inserting into cylinder.

Special instruction for fitting NPR NIFFLEX oil ring

1, Fit the expander of NIFFLEX oil ring into the ring groove by hand and ensure the ends butting together as shown in the illustration.

2,Hold with your thumb the expander at its butt ends. Fit the upper rail on to the expander with its gap approx.45° to the left,and the lower rail approx.45° to the right to the ends of expander.


Contact Details

Phone Number : +86 13076899589

WhatsApp : +8613076899589