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30/ENGINE - WORK ON THE INDIVIDUAL PARTS
Checking the piston ring end gap
19.20
Piston/cylinder - determining the mounting clearance
19.21
–
Check/measure the cylinder. (
–
Check/measure the piston. (
–
The smallest piston/cylinder mounting clearance equals the smallest cylinder bore diameter minus the largest piston diameter. The
largest piston/cylinder mounting clearance equals the largest cylinder bore diameter minus the smallest piston diameter.
Guideline
Piston/cylinder - mounting clearance (All 450 models)
Size I
Size II
Wear limit
Piston/cylinder - mounting clearance (All 570 models)
Size I
Size II
Wear limit
»
If the piston pin shows severe discoloration/signs of wear:
–
Replace the piston pin.
–
Place the piston pin in the connecting rod and check the seating for play.
»
If the piston pin seating has excessive play:
–
Replace the connecting rod and piston pin.
–
Measure the pistons at the piston skirt, perpendicular to the piston pin.
Guideline
Piston - diameter (All 450 models)
Size I
Size II
Piston - diameter (All 570 models)
300356-10
Size I
Size II
Info
Piston dimensions
–
Remove the piston ring from the piston.
–
Place the piston ring in the cylinder and align with the piston.
Guideline
Below the upper edge of the cylinder
–
Measure the end gap with a feeler gauge
Guideline
Piston ring - end gap
Compression ring
300357-10
Oil scraper ring
»
If the end gap is greater than the specified measurement:
–
Check/measure the cylinder. (
»
If cylinder wear lies within the specified tolerance:
–
Replace the piston ring.
–
Mount the piston ring with the marking facing toward the piston head.
p. 120)
p. 120)
94.93... 94.95 mm (3.7374...
3.7382 in)
94.95... 94.97 mm (3.7382...
3.739 in)
99.95... 99.96 mm (3.935...
3.9354 in)
99.96... 99.97 mm (3.9354...
3.9358 in)
are marked on the piston head.
10 mm (0.39 in)
.
≤ 1.00 mm (≤ 0.0394 in)
≤ 1.20 mm (≤ 0.0472 in)
p. 120)
0.040... 0.082 mm (0.00157... 0.00323 in)
0.042... 0.075 mm (0.00165... 0.00295 in)
0.120 mm (0.00472 in)
0.040... 0.062 mm (0.00157... 0.00244 in)
0.042... 0.065 mm (0.00165... 0.00256 in)
0.120 mm (0.00472 in)
121
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