Snowmobile Arctic Cat (2007 year). Instruction - part 22

 

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Snowmobile Arctic Cat (2007 year). Instruction - part 22

 

 

2-73

2

MD1580

19. Install the connecting rod cap nuts; then tighten

them to specifications.

MD1581

„ NOTE: Leave in the assembled condition for
three minutes. DO NOT rotate or move the crank-
shaft.

20. Remove the connecting rod cap nuts; then care-

fully remove the connecting rod caps and bear-

ings.

21. Using the scale supplied with the plastigauge,

verify that the oil clearance for each journal is

0.020-0.040 mm (0.00079-0.00157 in.) with a

maximum limit of 0.065 mm (0.00256 in.).

Remove the plastigauge; then clean the bearings

and connecting rod bearing journals.

22. Lubricate the connecting rod bearing and con-

necting rod journal surfaces liberally with

engine oil.

23. Keeping the appropriate connecting rod caps

with their respective connecting rods and align-

ing the “V”  arrows as before, install the con-

necting rod caps.

„ NOTE: Make sure the identification numbers
stamped on the side of the connecting rod caps
and the “V” arrow on the connecting rod caps are
facing the timing chain end of the crankcase. The
“V”

 arrow should be on the same side as the oil

squirter boss.

24. Install the connecting rod cap nuts; then tighten

them to specifications.

AO323A

25. Install the two cylinder head dowel pins, a new

cylinder head gasket (never reuse an old head

gasket), and the cylinder head.

„ NOTE: Make sure the identification marking
“TOP” on the gasket is facing up. 

MD1578

26. Apply engine oil to the eight cylinder head cap

screws and install the cap screws; then tighten to

specifications using the correct procedure.

0738-462

! CAUTION

Check that the oil venturi plug is not clogged. If it is,
clean it thoroughly; then install and tighten to speci-
fications.

Dowel

Pin

Dowel

Pin

2-74

„ NOTE: The sprocket on the end of the crankshaft
also serves as the oil pump drive.

MD1514

27. Rotate the crankshaft until the keyway faces

straight up with the No. 1 piston at top dead cen-

ter (TDC) and aligns with the mark on the

crankcase. 

MD1724

28. Verify that the camshafts being installed are

marked correctly: intake camshaft marked U

and exhaust camshaft marked V on the non-

turbo engine, or an intake camshaft marked X

and exhaust camshaft marked 7 on the turbo

models.

AO324B

AO324C

29. Set the intake and exhaust camshafts in place in

the cylinder head. Place a small piece of plasti-

gauge over each journal of the camshafts; then

install the dowel pins, camshaft caps, and cap

screws. Tighten the cap screws to specifications.

„ NOTE: The large camshaft cap mounts are posi-
tioned at the camshaft sprocket end of the cylinder
head. All other camshaft caps have identification
numbers designating intake-side (I-1, I-2, and I-3)
or exhaust-side (E-1, E-2, and E-3). The I-1 and E-1
caps mount nearest to the large one-piece cap on
the sprocket end; then I-2 and E-2 with I-3 and E-3
mounting at the far end. Arrows on each cap need
to face toward the sprocket end of the camshaft. 

! CAUTION

On the non-turbo engine, make sure the camshafts
are installed on the correct sides of the cylinder
head: the intake camshaft has a first digit U marked
on the gear face and the exhaust camshaft has a
first digit V marked on the gear face.

! CAUTION

On the turbo engine, make sure the camshafts are
installed on the correct sides of the cylinder head:
the intake camshaft has a first digit X marked on the
gear face and the exhaust camshaft has a first digit 7
marked on the gear face.

2-75

2

MD1521

30. Remove the camshaft cap retaining cap screws;

then carefully remove the camshaft caps.

31. Using the scale supplied with the plastigauge,

verify that the oil clearance for each journal is

0.045-0.087 mm (0.0018-0.0034 in.). Remove

the plastigauge; then clean the journals and

caps.

MD1723

32. Lubricate the camshaft journal and cap surfaces

liberally with engine oil.

33. Install the camshafts, dowel pins, camshaft caps,

and cap screws. Tighten the cap screws to speci-

fications.

„ NOTE: The large camshaft cap mounts are posi-
tioned at the camshaft sprocket end of the cylinder
head. All other camshaft caps have identification
numbers designating intake-side (I-1, I-2, and I-3)
or exhaust-side (E-1, E-2, and E-3). The I-1 and E-1
caps mount nearest to the large one-piece cap on
the timing sprocket end; then I-2 and E-2 with I-3
and E-3 mounting at the far end. Arrows on each
cap need to face toward the sprocket end of the
camshaft. 

MD1521

MD1522

34. Install the timing chain tensioner and cap

screws. Tighten the cap screws to specifications.

MD1588

35. With the No. 1 piston at top dead center (TDC),

rotate the camshafts so the arrows on the cam-

shaft sprockets are facing straight up and the

hash marks on the opposite sides of the sprock-

ets align with the timing bosses on the face of

the upper crankcase.

2-76

AO324A

36. With the crankshaft sprocket keyway aligned

with the mark on the crankcase, install the tim-

ing chain so the yellow link faces away from the

engine positioning it directly opposite from the

crankshaft-to-sprocket keyway.

„ NOTE: There is also an indent in the sprocket for
aligning with the yellow link.

AO325A

37. With the cam chain on the crankshaft sprocket,

slide the chain over the camshaft sprockets one

at a time making sure the arrow on each cam-

shaft aligns with the center of the dark links in

the timing chain.

0738-517

„ NOTE: The timing marks in the illustrations have
been highlighted for easy identification. The timing
marks are small triangles on the outer face of the
sprockets.

„ NOTE: The two camshafts may need to be
rotated sightly to align the two timing marks with
the two dark links. 

MD1596

38. Install the timing chain tensioner and cap screw;

then install the timing chain tensioner guide and

cap screws. Tighten the cap screws to specifica-

tions. 

AO326

AO327

39. While holding in the tab on the timing chain ten-

sioner plunger, install the timing chain tensioner

guide bracket and cap screws. Tighten the cap

screws to specifications.

 

 

 

 

 

 

 

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