LEMON Manuals: Even more car manuals for everyone
Home >> Smart >> 2015 >> Fortwo Electric Drive, 2D Convertible >> Repair and Diagnosis >> External Pages >> Different car >> Section 61 (Crank Assembly - 212 Chassis - 1 Of 2) >> Testing & Repair >> Remove/install piston rings >> Remove/install piston rings - AR03.10-P-7311T

Remove/install piston rings - AR03.10-P-7311T

WARNING: This page does not describe the selected car, but rather 33 other vehicles, including the 2016 Mercedes-Benz E63 S AMG, 2016 Mercedes-Benz E400, 2016 Mercedes-Benz E350, 2016 Mercedes-Benz E300, and 2016 Mercedes-Benz E250. However, it is still accessible from the selected car via links, so may be relevant.

ENGINE 646.8/951/961/962/963/966, 647.961, 648.961 

ENGINE 651 in MODEL 166, 172, 204, 205, 207, 212, 218, 221 

Shown on piston for engine 646 

Fig 1: Piston Rings Remove/Install Components
G09974075Courtesy of MERCEDES-BENZ USA

Measure vertical clearance 

Fig 2: Measuring Piston Rings Vertical Clearance
G09974068Courtesy of MERCEDES-BENZ USA

Measure end gap 

Fig 3: Measuring Piston Rings End Gap
G09974069Courtesy of MERCEDES-BENZ USA
REMOVINGINSTALLING Remove/install     
1 Remove pistons ENGINE 646.8/951/961/962/963/966, 647.961, 648.961 AR03.10-P-7021T
ENGINE 651 in MODEL 166, 172, 204, 207, 212, 218, 221 AR03.10-P-7021CD 
ENGINE 651 in MODEL 205 AR03.10-P-7021OLD
2 Determine side clearance of plain compression ring (1), taper-faced hook scraper ring (2) and bevel-edged ring (3) ENGINE 646.8/951/961/962/963/966, 647.961, 648.961 *BE03.10-P-1001-05J 
ENGINE 651 in MODEL 166, 172, 204, 205, 207, 212, 218, 221 *BE03.10-P-1001-05K 
3 Remove plain compression ring (1), taper-faced hook scraper ring (2) and bevel-edged ring (3) using pliers (10) from the piston INSTALLATION IMPORTANT Install plain compression ring (1), taper-faced hook scraper ring (2) and bevel-edged ring (3) with piston ring end gap offset at 120°.
INSTALLATION IMPORTANT Insert hook spring (8) with garter spring (4) offset 180° to the ring gap of the bevel-edged ring (3) (arrow).
INSTALLATION IMPORTANT Observe installation position of plain compression ring (1), taper-faced hook scraper ring (2) and bevel-edged ring (3). The lettering "Top" or the name of the manufacturer must point towards the piston crown.		  
SPECIAL TOOL Pliers Figure
CLEAN Clean     
4 Clean groove of plain compression ring (1), the taper-faced hook scraper ring (2) and the bevel-edged ring (3) in piston    
5 Clean cylinder barrel on the inside    
INSPECT Check     
6 Check plain compression ring (1), taper-faced hook scraper ring (2) and bevel-edged ring (3) for damage or chippings on the coating IMPORTANT Replace plain compression ring (1), taper-faced hook scraper ring (2) or bevel-edged ring (3) if necessary.  
7 Determine end gap of plain compression ring (1), taper-faced hook scraper ring (2) and bevel-edged ring (3) IMPORTANT Insert respective plain compression ring (1), taper-faced hook scraper ring (2) and bevel-edged ring (3) in the unworn area of the cylinder barrel.  
ENGINE 646.8/951/961/962/963/966, 647.961, 648.961 *BE03.10-P-1002-05J 
ENGINE 651 in MODEL 166, 172, 204, 205, 207, 212, 218, 221 *BE03.10-P-1002-05K 
8 Install in the reverse order    
CHECK VALUES FOR PISTON RINGS

Number Designation ENGINE 646.8 ENGINE 646.9
BE03.10-P-1001-05J Piston ring vertical clearance Groove 1 mm 0, 13...0, 17 0, 12...0, 16
Groove 2 mm 0, 07...0, 09 0, 05...0, 09
Groove 3 mm 0, 03...0, 07 0, 03...0, 07
CHECK VALUES FOR PISTON RINGS

Number Designation ENGINE 647 ENGINE 648
BE03.10-P-1001-05J Piston ring vertical clearance Groove 1 mm 0, 12...0, 16 0, 12...0, 16
Groove 2 mm 0, 05...0, 09 0, 05...0, 09
Groove 3 mm 0, 03...0, 07 0, 03...0, 07
CHECK VALUES FOR PISTON RINGS

Number Designation ENGINE 651
BE03.10-P-1001-05K Piston ring vertical clearance Groove 1 mm 0, 12...0, 16
Groove 2 mm 0, 035...0, 08
Groove 3 mm 0, 03...0, 07
CHECK VALUES FOR PISTON RINGS

Number Designation ENGINE 646.8 ENGINE 646.9
BE03.10-P-1002-05J Piston ring end gap Groove 1 mm 0, 22...0, 37 0, 22...0, 37
Groove 2 mm 0, 80...1, 00 0, 80...1, 00
Groove 3 mm 0, 20...0, 40 0, 20...0, 40
CHECK VALUES FOR PISTON RINGS

Number Designation ENGINE 647 ENGINE 648
BE03.10-P-1002-05J Piston ring end gap Groove 1 mm 0, 22...0, 42 0, 22...0, 42
Groove 2 mm 0, 80...1, 00 0, 80...1, 00
Groove 3 mm 0, 20...0, 40 0, 20...0, 40
CHECK VALUES FOR PISTON RINGS

Number Designation ENGINE 651
BE03.10-P-1002-05K Piston ring end gap Groove 1 mm 0, 27...0, 37
Groove 2 mm 0, 8...1, 0
Groove 3 mm 0, 2...0, 4
Fig 4: Identifying Pliers (000 589 51 37 00)
G09974078Courtesy of MERCEDES-BENZ USA
scientia non olet · About LEMON Manuals