Operation Manual

Job Card No.:
Engine:
Filing No.:
Piston Pin, Piston Pin Bush, Piston Pin Bore
Gauging / Reconditioning
0178-07-10 1096
Gauging
Measure the bearing clearance.
Job:
Remove pin (job 02.12.01). Put rod (3) upright. Intro-
duce cleaned pin (1) into cleaned bush until pin
projection "a" is equal at both bush ends.
Measure bearing clearance "S" by feeler gauge.
Insert piston pin in cleaned piston pin bore and
measure clearance. When the specified wear limit
has been exceeded, the components must be indivi-
dually gauged and the worn items renewed.
Clearance New Wear
Condition Limit
Pin / Bush 0,09 - 0,155 0,2
Pin / Piston Bore 0,01 - 0,03 0,1
Diameter
Pin bush
inner 105,090 to
diameter 105,145 105,15
Piston pin 104,990 to 104,95
105,000
Piston pin bore 105,010 to 105,07
105,020
Reconditioning
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02.13.01 Page 1 of 2
S/BVM 628
Tools:
- Feeler gauge,
- Inside micrometer,
- Outside micrometer,
- Removing/Refitting device for
big-end bush (Section 1.8.1)
Press out old bushes with a suitable tool after
applying a saw. Undercool new bush with liquid
nitrogen, if available, (see Section 3.7) or by placing
the bush in the freezer. Heat small end in oil bath to
80-90°C. Introduce bush by removing/refitting de-
vice so that the bush projects the conrod eye evenly
on the right and left. Afterwards, check bush for
roundness and then check - with the adjoining fixture
(4) - that the unparallelism between the small-end/
big-end bearing centre lines is max. 0,04 mm per 100
mm length. If such fixture is not available, proceed as
follows:
© 51 270 0