BOMBARDIER SEA-DOO SPX 5838 1998 Shop Manual page 93

Section 04 ENGINE
Subsection 05 (TOP END)
2
F00B09A
1. Use the micrometer to set the cylinder bore gauge
2. Dial bore gauge
F00B0AA
1. Indicator set to zero
Position the dial bore gauge at 16 mm (5/8 in) be-
low cylinder top edge.
A
F01D0KA
1. Measuring perpendicularly (90°) to piston pin axis
A. 16 mm (5/8 in)
04-05-18
Read the measurement on the cylinder bore
gauge. The result is the exact piston/cylinder wall
clearance.
NOTE: Make sure the cylinder bore gauge indica-
tor is set exactly at the same position as with the
1
micrometer, otherwise the reading will be false.
Ring/Piston Groove Clearance
717 and 787 Engines
Using a feeler gauge, check clearance between
rectangular ring and groove. If clearance exceeds
specified tolerance, replace piston.
NOTE: Ring/piston groove clearance can be cor-
rectly measured only on rectangular ring which is
bottom ring.
1
1. Feeler gauge
2. Rectangular ring (bottom)
947 Engine
Due to the semi-trapez rings, it is not possible to
accurately measure ring/piston groove clearance.
Ring End Gap
Position ring halfway between exhaust port and
top of cylinder.
NOTE: In order to correctly position ring in cylin-
der, use piston as a pusher.
Using a feeler gauge, check ring end gap. If gap
exceeds specified tolerance, rings should be re-
1
placed.
1
F01D0XA
2