Ski-Doo FORMULA III, Shop Manual

Page: 113 / 356

Section 04 ENGINE
Sub-Section 04 (LEAK TEST AND ENGINE DIMENSION MEASUREMENT)
04-04-2
Engine
TYPICAL
1. Blocked intake flanges
2. Blocked impulse fitting
3. Open ends (if applicable)
4. Blocked RAVE valve flanges (if applicable)
5. Blocked exhaust flanges
When exhaust manifold is installed, use rubber
plug. (In this case it is not necessary to move pis-
ton to BDC).
1. Rubber plug
Check the following :
1. All jointed surfaces and screw / stud threads of
engine :
– spark plug base, insulator
– cylinder head
– decompressor valve (247 and 277 types
only)
– cylinder base
– crankcase halves (joint)
– rotary valve cover
– oil injection pump mounting flange (O-ring,
seal)
– coolant pump housing
– bleed screws / plugs
2. Small injection oil lines coming from pump.
1. Banjo fittings
2. Small injection oil lines
Check for air bubbles or oil column going toward
pump. It indicates defective check valve in banjo
fitting (or lines).
3. Remove cooling system cap.
Check for air bubbles in antifreeze. It indicates de-
fective cylinder head O-ring or cylinder base gas-
ket.
4. Block both hoses of rotary valve gear lubrica-
tion system with hose pincers.
A01B4TA
1
2
3
4
5
A01B4BA
1
A01B2XA
1
2