1986 Ski-Doo Factory Shop Manual, Page 150Get this manual
Section 02 ENGINE SUb-section 07 (503 ENGINE TYPE)
, Cylinder flange gasml (21 2Cylinder (21 3Cylinder head gasket 12l 4Cylindar head (2) 5Washer 8.4 mm (41 6Hexagonal nUl mm 141 7Washer 8.4 mm (4) 8Distance nut J( 37 mm (41 9Intake manifold gasket t4) 70Imake manifold 11, Lnek washer mm (4) 12, Hexagonal bolt Me 40 mm (2)
14Imake manfold cover isHexagonal bolt MB 64 mm 12 16Lock washer mm 12) 17Hexagonal bole M6 30 mm (2) 18Noise damper 19, Noise damper (shorr) (41 20, Noise damper (long) (4) 21 Piston (2) 22Rectangular ring (2) 23Semi-lrapez ring (2) 24Needle bearing 12 25Gudgeon pm (2)
13O-ring
26, Cirelip (4)
CLEANING
Discard all gaskets, Clean all metal components in non-ferrous metal cleanerScrape off carbon formation from cylinder exhaust port, cylinder head and piston dome using wooden spatula
INSPECTION
The inspection of the engine top end must Include the following measurements:
TOLERANCES MEASUREMENTS FiniNG NEW PARTS (MIN,) IMAX,j WEAR LIMIT
NOTE: The letters' 'AUS" rover an (row on the piston domel must be visible after cleaning, Clean the piston ring grooves with groove cleaner tool,