Connecting Rods - MOTO GUZZI V1000 G5 Workshop Manual

12.14 PISTON RINGS AND OIL SCRAPER
Each piston fi ts 3 rings (2 compression 1 lop and
1 cenler stepped) and 1 oil scraper.
The rings have to be fitted in their slots with the end
gap out of line with each other.
Assembly clearance measured between ring
thickness and piston groove (see " A .. in fig. 52)
Compression ring and oil scraper: 0.030-0.062 mm
(.0011-.0024" ).
Assembly clearance between end gap of ring
in the cylinder (see .. B .. in fig. 52)
TOp compression ring and stepped r ing : 0.30-0.45 mm
(.0118-.0177").
Oil scraper : 0.25-0AO mm (.0098-.015" - 0.25-0.50
(.0098-.019) for scaper ring
w/ o
spring ).
Assembling the piston in the small end (see fig. 54)
On assembly, the piston section marked .. SeA .. (see
arrow «A») should lace the exhaust port.
12.1 5 CONNECTING RODS
When overhauling the con-rods, check the following :
• condition of the small end bushings and the
bush-piston pin clearance;
•
•
•
weight of conrods:
parallelism of axis ;
big end bearings.
The big end bearings are of thin wall type in anti-
fr iction alloy and this does not allow any adj ustment.
II scored, worn . or seized they must be replaced.
In such a case , the crankpin has to be re-ground.
Before this re-gri nding operation is proceeded with.
it is necessary to measure the crankpin diameter at
the major wear point so as to determine the U! S
class of the bearing to be replaced and the diameter
to which the crankpin has 10 be ground .
See table .. Thickness of big end bearings» and
"crankpin diameter,..
Selection
CLASS .A. CLASS . B.
(BLEU MARK ON STEM) (WHIT E MARK O N STEM )
47,130 + 47,136 47,136 + 47.142
(1 .8555" )-{1 .8557" ) (1 .8557" )- (1 .8560" )
Crankshaft-connecting rod selection (see fig. 57
and dwg fig. 58)
Con-rods of crass "A" marked .. BIANCO" have to
be matched with c rankshafts of class .. B» marked
55
56
47