Remove/install piston rings

AR03.10-D-7311R

Remove/install piston rings

04.09.2018

Engine

646 in model 909

1

Compression ring

2

Compression ring

3

Oil scraper ring

4

Garter spring

5

Piston

6

Pliers

Measure vertical clearance

Measure end gap



Remove

1

Remove piston (5)

AR03.10-D-7021R



Measure

2

Measure side clearance of compression ring (1), compression ring (2) and oil scraper ring (3)

 Clean piston pin zones before measuring.

Piston ring vertical clearance

*BE03.10-N-1003-02Q

Cold degreasing agent/cold cleaning solvent HAKU 1025-920

*BR00.45-Z-1051-04A

3

Remove compression rings (1, 2) and oil scraper ring (3) together with garter spring (4) on piston (5) using pliers (6)

 Pliers

*000589513700

4

Measure end gap of compression ring (1) and compression ring (2)

 Clean cylinder barrel before measuring.
To measure the respective compression ring (1, 2), insert in the area of the cylinder barrel which is not worn.

Cold degreasing agent/cold cleaning solvent HAKU 1025-920

*BR00.45-Z-1051-04A

Piston ring end gap

*BE03.10-N-1004-02Q

5

Remove garter spring (4) and measure end gap of oil scraper ring (3)

 To measure oil scraper ring (3) insert in the area of the cylinder barrel which is not worn.

Piston ring end gap

*BE03.10-N-1004-02Q

Cold degreasing agent/cold cleaning solvent HAKU 1025-920

*BR00.45-Z-1051-04A



Install

6

Insert garter spring (4) in the corresponding groove on piston (5), then install oil scraper ring (3) using pliers (6)

 Offset ends of the garter spring (4) to ring gap from oil scraper ring (3) by 180° (arrow).

 Pliers

*000589513700

7

Insert compression ring (1) and compression ring (2) in the corresponding groove in piston (5) using pliers (6)

 The "Top" emblem or the manufacturer's name must point towards the piston crown. Insert compression ring (1), compression ring (2) and oil scraper ring (3) with ring gaps offset by 120° to each other.

 Pliers

*000589513700

8

Install piston (5)

AR03.10-D-7021R

Test specifications for pistons

Number

Designation

Engine 646 in model 909

BE03.10-N-1003-02Q

Piston ring vertical clearance

Groove 1

mm

0,12...0,16

Groove 2

mm

0,05...0,09

Groove 3

mm

0,03...0,07

Test specifications for pistons

Number

Designation

Engine 646 in model 909

BE03.10-N-1004-02Q

Piston ring end gap

Groove 1

mm

0,22...0,37

Groove 2

mm

0,80...1,00

Groove 3

mm

0,20...0,40

Repair materials

Number

Designation

Order number

BR00.45-Z-1051-04A

Cold degreasing agent/cold cleaning solvent HAKU 1025-920

Chemische Werke Kluthe GmbH
Gottlieb-Daimler-Str. 12
69115 Heidelberg
Germany
Tel. +49 6221 5301-0
Fax +49 6221 5301-176
http://kluthe.com