Gilera SATURNO BIALBERO 350, Workshop Manual

Page: 49 / 140

CYLINDER HEAD VALVETRAIN
COMPONENTS 7 - 2
DISASSEMBLY
Pull off the water passage coupler mounted on the right side of the
head and remove the O-ring found under the coupler fitting (fig. 1).
Remove timing belt cover; loosen idle roller nut and position the idle
roller in such a way as to permit the belt to come off the two cam
pulleys (fig. 2).
Loosen the cylinder head nuts gradually and uniformly. This operation
must be executed in a diagonal crossed sequence.
Remove the head by carefully lifting it from its cylinder. If necessary
loosen the head by hitting it with a plastic mallet (fig. 3).
Block the two camshaft pulleys with special tool 19.1.00504, then
loosen the pulley bolts. Remove bolts with its washers and pull off the
pulleys (figs. 4-5).
Remove the cover plate of the rocker arm shaft retainer bushing (fig. 6).
Remove the cylinder head cover and remove the camshafts with their
oil seals (figs. 7-8)
Remove the valve lifter device (found on the left hand side of head,
near the exhaust valve) by extracting the retainer pin (fig. 9). The little
shaft together with the lifter may now be dismantled by hand.
Extract the retainer bushing and intake rocker arm shaft (use an 8mm
bolt with a 1.25 pitch) and remove the two rocker arms together with
spacer washers and spring. Repeat same procedure for the exhaust
side (fig. 10).
Compress each valve spring with special tool 19.1.20519, by pressing
on spring retainer with enough pressure to remove the collets. Next,
remove the spring retainer and the two outer/inner springs (figs. 11-12).
Slide out the valve from the guide; remove the oil seal (found on the
upper part of the guide and spring seat). Repeat same procedure for
the other valves (fig. 13).
Loosen nut and remove the belt tensioner pulley and spring (fig. 14).
7 - 2,1