YAMAHA GRIZZLY 660 2008 Owners Manual

8-17
8 2. Check the spark plug for electrode erosion
and excessive carbon or other deposits, and
replace it if necessary.
To install the spark plug
1. Measure the spark plug gap with a wire thick-
ness gauge and, if necessary, adjust the gap
to specification.
2. Clean the surface of the spark plug gasket
and its mating surface, and then wipe off any
grime from the spark plug threads.
3. Install the spark plug with the spark plug
wrench, and then tighten it to the specified
torque. Specified spark plug:
NGK/DPR8EA-9
Spark plug gap:
0.8–0.9 mm (0.031–0.035 in)
1. Spark plug gapTightening torque:
Spark plug:
17.5 Nm (1.75 m·kgf, 12.7 ft·lbf)
U23D60E0.book Page 17 Thursday, March 15, 2007 7:59 PM

8-18
8
NOTE:If a torque wrench is not available when installing
a spark plug, a good estimate of the correct torque
is 1/4–1/2 turn past finger tight. However, the spark
plug should be tightened to the specified torque assoon as possible.
4. Install the spark plug cap.
5. Install the panel.EBU23325Engine oil and oil filter cartridge The engine oil level should be checked before
each ride. In addition, the oil must be changed and
the oil filter cartridge replaced at the intervals spec-
ified in the periodic maintenance and lubrication
chart.
To check the engine oil level
1. Remove panel F. (See page 8-9.)
2. Place the ATV on a level surface.
3. Check the engine oil level on a cold engine.
NOTE:If the engine was started before checking the oil
level, be sure to warm up the engine sufficiently,
and then wait at least ten minutes until the oil set-tles for an accurate reading.
4. Remove the engine oil filler cap, and then
wipe the dipstick off with a clean rag.
5. Insert the dipstick into the filler hole (without
screwing it in), and then remove it again to
check the oil level.1. Engine oil filler cap
2. Dipstick
U23D60E0.book Page 18 Thursday, March 15, 2007 7:59 PM

8-19
8
NOTE:The engine oil should be between the minimumand maximum level marks.
6. If the engine oil is at or below the minimum
level mark, add sufficient oil of the recom-
mended type to raise it to the correct level.
7. Insert the dipstick into the oil filler hole, and
then tighten the engine oil filler cap.
8. Install the panel.To change the engine oil (with or without oil fil-
ter cartridge replacement)
1. Remove panel F. (See page 8-9.)
2. Place the ATV on a level surface.
3. Start the engine, warm it up for several min-
utes, and then turn it off.
4. Place an oil pan under the engine to collect
the used oil.
5. Remove the engine oil filler cap, and then re-
move the engine oil drain bolt to drain the oil
from the crankcase.1. Maximum level mark
2. Minimum level mark
1. Engine oil drain bolt
U23D60E0.book Page 19 Thursday, March 15, 2007 7:59 PM

8-20
8
NOTE:Skip steps 6–10 if the oil filter cartridge is not beingreplaced.
6. Remove panels D and E. (See page 8-9.)
7. Remove the oil filter cartridge with an oil filter
wrench.NOTE:An oil filter wrench is available at a nearby Yamahadealer.
8. Apply a thin coat of engine oil to the O-ring of
the new oil filter cartridge.
NOTE:Make sure that the O-ring is properly seated.
9. Install the new oil filter cartridge with an oil fil-
ter wrench, and then tighten it to the specified
torque with a torque wrench.
1. Oil filter cartridge
2. Oil filter wrench
1. O-ring
U23D60E0.book Page 20 Thursday, March 15, 2007 7:59 PM

8-21
8
10. Install panels D and E.
11. Install the engine oil drain bolt, and then tight-
en it to the specified torque.12. Add the specified amount of the recommend-
ed engine oil, and then install and tighten the
engine oil filler cap.
NOTE:Be sure to wipe off spilled oil on any parts after theengine and exhaust system have cooled down.CAUTION:ECB00300
In order to prevent clutch slippage (since the
engine oil also lubricates the clutch), do not
mix any chemical additives. Do not use oils
with a diesel specification of “CD” or oils of
a higher quality than specified. In addition,
do not use oils labeled “ENERGY CONSERV-
ING II” or higher.
1. Torque wrenchTightening torque:
Oil filter cartridge:
17 Nm (1.7 m·kgf, 12 ft·lbf)
Tightening torque:
Engine oil drain bolt:
30 Nm (3.0 m·kgf, 22 ft·lbf)
Recommended oil:
See page 10-1.
Oil quantity:
Without oil filter cartridge replacement:
1.90 L (2.01 US qt) (1.67 Imp.qt)
With oil filter car tridge replacement:
2.00 L (2.11 US qt) (1.76 Imp.qt)
U23D60E0.book Page 21 Thursday, March 15, 2007 7:59 PM

8-22
8

Make sure that no foreign material enters thecrankcase.
13. Start the engine, and then let it idle for several
minutes while checking it for oil leakage. If oil
is leaking, immediately turn the engine off and
check for the cause.
14. Turn the engine off, wait at least ten minutes,
and then check the oil level and correct it if
necessary.
15. Install panel F.EBU27302Final gear oil The final gear case must be checked for oil leak-
age before each ride. If any leakage is found, have
a Yamaha dealer check and repair the ATV. In ad-
dition, the final gear oil level must be checked and
the oil changed as follows at the intervals specified
in the periodic maintenance and lubrication chart.
To check the final gear oil level
1. Place the ATV on a level surface.NOTE:The final gear oil level must be checked on a coldengine.2. Remove the final gear oil level check bolt, and
then check the oil level in the final gear case.
NOTE:The oil level should be at the brim of the checkhole.
3. If the oil is below the brim of the check hole,
remove the final gear oil filler bolt, and then
add sufficient oil of the recommended type to
raise it to the correct level.1. Final gear oil
2. Final gear oil level check bolt
3. Correct oil level
U23D60E0.book Page 22 Thursday, March 15, 2007 7:59 PM

8-23
8 4. Install the oil level check bolt and oil filler bolt,
and then tighten them to the specified torques.
To change the final gear oil
1. Place the ATV on a level surface.
2. Place an oil pan under the final gear case to
collect the used oil.3. Remove the final gear oil filler bolt, final gear
oil level check bolt, and the final gear oil drain
bolt to drain the oil from the final gear case.
4. Install the drain bolt, and then tighten it to the
specified torque.
5. Add the recommended final gear oil to the
brim of the check hole as shown.
1. Final gear oil filler boltTightening torques:
Final gear oil level check bolt:
10 Nm (1.0 m·kgf, 7.2 ft·lbf)
Final gear oil filler bolt:
23 Nm (2.3 m·kgf, 17 ft·lbf)
1. Final gear oil drain boltTightening torque:
Final gear oil drain bolt:
23 Nm (2.3 m·kgf, 17 ft·lbf)
U23D60E0.book Page 23 Thursday, March 15, 2007 7:59 PM

8-24
8
CAUTION:ECB00420Be sure no foreign material enters the finalgear case.
6. Install the oil level check bolt and oil filler bolt,
and then tighten them to the specified torques.7. Check the final gear case for oil leakage. If oil
is leaking, check for the cause.
EBU23421Differential gear oil The differential gear case must be checked for oil
leakage before each ride. If any leakage is found,
have a Yamaha dealer check and repair the ATV.
In addition, the differential gear oil level must be
checked and the oil changed as follows at the in-
tervals specified in the periodic maintenance and
lubrication chart.
To check the differential gear oil level
1. Place the ATV on a level surface.NOTE:The differential gear oil level must be checked ona cold engine.
1. Final gear oil
2. Final gear oil level check bolt
3. Correct oil levelRecommended final gear oil:
See page 10-1.
Tightening torques:
Final gear oil level check bolt:
10 Nm (1.0 m·kgf, 7.2 ft·lbf)
Final gear oil filler bolt:
23 Nm (2.3 m·kgf, 17 ft·lbf)
U23D60E0.book Page 24 Thursday, March 15, 2007 7:59 PM

8-25
8 2. Remove the differential gear oil filler bolt, and
then check the oil level in the differential gear
case.
NOTE:The oil level should be at the brim of the filler hole.
3. If the oil is below the brim of the filler hole, add
sufficient oil of the recommended type to raise
it to the correct level.
4. Install the oil filler bolt, and then tighten it to the
specified torque.To change the differential gear oil
1. Place the ATV on a level surface.
2. Place an oil pan under the differential gear
case to collect the used oil.
3. Remove the differential gear oil filler bolt and
the differential gear oil drain bolt to drain the
oil from the differential gear case.
4. Install the drain bolt, and then tighten it to the
specified torque.1. Differential gear oil
2. Differential gear oil filler bolt
3. Correct oil level
Tightening torque:
Differential gear oil filler bolt:
23 Nm (2.3 m·kgf, 17 ft·lbf)1. Differential gear oil drain bolt
U23D60E0.book Page 25 Thursday, March 15, 2007 7:59 PM

8-26
85. Add the recommended differential gear oil to
the brim of the filler hole as shown.
CAUTION:ECB00410Be sure no foreign material enters the differen-tial gear case.
6. Install the oil filler bolt, and then tighten it to the
specified torque.
7. Check the differential gear case for oil leak-
age. If oil is leaking, check for the cause.EBU23470Coolant The coolant level should be checked before each
ride. In addition, the coolant must be changed at
the intervals specified in the periodic maintenance
and lubrication chart.EBU27122To check the coolant level
1. Place the ATV on a level surface. Tightening torque:
Differential gear oil drain bolt:
10 Nm (1.0 m·kgf, 7.2 ft·lbf)
1. Differential gear oil
2. Differential gear oil filler bolt
3. Correct oil levelRecommended differential gear oil:
See page 10-1.
Tightening torque:
Differential gear oil filler bolt:
23 Nm (2.3 m·kgf, 17 ft·lbf)
U23D60E0.book Page 26 Thursday, March 15, 2007 7:59 PM