Suzuki GS500E (1989-1997) [89/221] 54 engine clutch and transmission

Suzuki GS500E (1989-1997) [89/221] 54 engine clutch and transmission
2-54 Engine, clutch and transmission
30 Balancer shaft and bearings - ~
removal, inspection and ~
installation ~
Note: To remove the balancer shaft the engine
must be removed from the frame and the
crankcases separated.
Removal
1 Separate the crankcase halves (Section 23).
2 Lift the balancer shaft out of the upper
crankcase half, noting how it fits. If it appears
stuck, tap it gently using a soft-faced mallet.
3 If required, unscrew the bolt In the right-
hand end of the balancer shaft, then remove
the outer washer, the spacer and the middle
washer (see illustration). Using a flat. bladed
screwdriver. carefully lever each damper
spring out of its slot in the driven gear. taking
care not to lose their end caps. Slide the
driven gear outer section off the shaft, noting
how it fits. If the driven gear inner section
needs to be removed, use a puller. If a puller
is not available, carefully lever it off using a
pair of tyre levers. Note how it locates over the
Woodruff key. If it Is loose, remove the
Woodruff key from Its slot in the shaft, then
remove the inner washer.
Inspection
4 Clean the balancer shaft with solvent, using
a rifle-cleaning brush to scrub out the oil
passages. If available, blow the shaft dry with
compressed air, and also blow through the oil
passages.
5 Refer to Section 28 and examine the
30.8 Measure the free length of each
damper spring
corresponding balancer shaft journal. Evidence
of extreme heat, such as discoloration,
indicates that lubrication failure has occurred.
Be sure to thoroughly check the oil pump and
pressure regulator as well as all oil holes and
passages before reassembling the engine.
6 The balancer shaft journals should be given
a close visual examination, paying particular
attention where damaged bearings have been
discovered. If the journals are scored or pitted
in any way a new balancer shaft will be
required. Undersizes are not available,
precluding the option of re-grinding the shaft.
7 Check the balancer shaft driven gear
sections for wear or damage. If any of the
teeth on the outer section are excessively
worn, chipped or broken, the gear must be
replaced. Note that the inner section of the
gear is not available as an individual
component, but comes as part of the balancer
shaft assembly.
8 Measure the free length of each damper
spring (with the spring caps removed), and
compare the result to the specifications at the
beginning of the chapter (see illustration). If
the free length of any spring is below the
service limit specified, replace all three springs.
Bearing shell selection
9 Replacement bearing shells for the
balancer shaft bearings are supplied on a
selected fit basis. Code numbers stamped on
the balancer and crankcase are used to
identify the correct replacement bearings. The
balancer shaft bearing journal size letters, one
letter for each journal (either an A, a B or a C),
are stamped on the outside of each web on
the balancer shaft; the letter on the left-hand
30.9 Balancer shaft bearing housing size
letters (arrows)
size letters (either an A or a B) are stamped
into the rear of the upper crankcase half (see
Illustration). The left. hand letter is for the left
journal, the right-hand letter for the right-hand
journal.
10 A range of bearing shells is available. To
select the correct bearing for a particular
journal, using the table below cross-refer the
bearing journal size letter (stamped on the web)
with the bearing housing size letter (stamped
on the crankcase) to determine the c~our code
of the bearing required. For example. if the
journal size is C, and the housing size is B. then
the bearing required is Yellow.
"
Balancer shaft
joumalcode
ABC
Crankcase
housk1g
code
A Green Black Brown
~
~ Black Brown Y~~J-
Oil clearance check
Note: The crankshaft main bearing oil
clearance should be checked simultaneously
with the balancer shaft bearing oil clearance
(see Section 29).
11 Whether new bearing shells are being
fitted or the original ones are being re-used,
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