PIAGGIO MSS ZIP 100 4T, Service Manual

Page: 97 / 192

NATION WITH A USED CYLINDER MAY HAVE
DIFFERENT BEDDING CONDITIONS THAN
THE STANDARD.
SEALING RINGS
Name Descripti
on
Dimensio
ns
Initials Quantity
Top piston
ring
0.08 ÷
0.20 mm
0.35 mm
Middle pis-
ton ring
0.05 ÷
0.20 mm
0.30 mm
oil scraper 0.20 ÷
0.70 mm
0.80 mm
Refitting the cylinder
If the four cylinder stud bolts should be replaced in this kind of engine, it is necessary to tighten the
head nuts strictly following the procedure below.
The procedure is different from that indicated in the vehicle manuals:
Head nuts tightening (only for stud bolts replacement) 6÷7 N*m +90° + 90° + 90°
The 45° rotation reduction of the key is necessary to avoid stud bolt stretching.
- Fit the base gasket of the chosen thickness, pre-
viously determined.
- Fit the cylinder as shown in the figure
- The piston can be kept out of the housing plane
using the appropriate tool.
N.B.
BEFORE FITTING THE CYLINDER, CAREFULLY BLOW
OUT THE LUBRICATION DUCT AND OIL THE CYLINDER
BARREL.
Specific tooling
020288Y Fork to assemble piston on cylinder
Inspecting the cylinder head
- Using a trued bar check that the cylinder head
surface is not worn or distorted.
- Check that the camshaft and rocking lever pin
bearings show no signs of wear.
- Check that the cylinder head cover surface, the
intake manifold and the exhaust manifold are not
worn.
Characteristic
Maximum admitted unevenness: Head check
MSS ZIP 100 4T
Engine
ENG - 97