2018 YAMAHA WOLVERINE Owners Manual

8-24
8
4. Install the differential gear oil drain boltand its new gasket, and then tighten the
bolt to the specified torque.
5. Refill the differential gear case with the recommended oil.
TIPGL-4 is a quality and additive rating; GL-5
rated hypoid gear oils may also be used.
 If desired, an SAE 80W-90 hypoid gear oil
may be used instead. 6. Check the oil filler bolt gasket for dam-
age, and replace it if necessary.
7. Install the differential gear oil filler bolt and its gasket, and then tighten the bolt
to the specified torque.
8. Check for oil leakage. If oil leakage is found, check for the cause.
1. Differential gear oil drain bolt
2. GasketTightening torque:Differential gear oil drain bolt:9.8 N·m (0.98 kgf·m, 7.2 lb·ft)
12
Tightening torque: Differential gear oil filler bolt:23 N·m (2.3 kgf·m, 17 lb·ft)
UB3D7AE0.book Page 24 Tuesday, November 7, 2017 9:38 AM

8-25
8
EBU33661CoolantThe coolant level should be checked regular-
ly. In addition, the coolant must be changed
at the intervals specified in the periodic main-
tenance chart.TIPIf genuine Yamaha coolant is not available,
use an ethylene glycol antifreeze containing
corrosion inhibitors for aluminum engines and
mix with distilled water at a 1:1 ratio.
NOTICEECB02190Mix antifreeze with distilled water only.
However, if distilled water is not available,
soft water may be used for refilling. Do not
use hard water or salt water since they are
harmful to the engine. To check the coolant level1. Park the vehicle on a level surface.
2. Wait for the engine to cool for an accurate reading.
3. Look the coolant level in the coolant res- ervoir.
Recommended coolant:YAMALUBE coolant
Coolant quantity: Coolant reservoir (up to full level):0.28 L (0.30 US qt, 0.25 Imp.qt)
Radiator (including all routes): 2.85 L (3.01 US qt, 2.51 Imp.qt)
UB3D7AE0.book Page 25 Tuesday, November 7, 2017 9:38 AM

8-26
8
4. If the coolant is at or below the minimumlevel mark, remove the coolant reservoir
cap and add coolant to the maximum lev-
el mark.
5. Install the reservoir cap.
To change the coolant 1. Park the vehicle on a level surface.
2. Remove the hood. (See page 8-10.) 3. When the engine is cool, remove the radi-
ator cap. WARNING! Never attempt to
remove the radiator cap when the en-
gine is hot.
[EWB04250]
4. Place a container under the engine to col- lect the used coolant.
5. Remove the coolant drain bolt. Discard the used gasket.
1. Coolant reservoir cap
2. Maximum level mark
3. Minimum level mark
123
1. Radiator cap
1
UB3D7AE0.book Page 26 Tuesday, November 7, 2017 9:38 AM

8-27
8
6. Remove the coolant reservoir cap.7. Place a container under the coolant res-
ervoir.
8. Disconnect the coolant reservoir hose and drain the reservoir.
9. After draining both the radiator and the
reservoir, thoroughly flush the cooling
system with clean tap water.
10. Install the coolant drain bolt with a new
gasket, and then tighten to the specified
torque.1. Coolant drain bolt
2. Gasket
1 2
1. Coolant reservoir cap
2. Coolant reservoir hose
12
UB3D7AE0.book Page 27 Tuesday, November 7, 2017 9:38 AM

8-28
8
11. Connect the coolant reservoir hose.
12. Pour the specified amount of fresh cool-ant into the radiator, then install the radi-
ator cap.
13. Pour the specified amount of fresh cool- ant into the reservoir, then install the res-
ervoir cap.
14. Remove the right panel and right rear panel. (See page 8-11.)
15. Loosen the water pump air bleed bolt to
allow air to escape from the system. 16. When coolant begins to flow out, tighten
the bleed bolt.
17. Loosen the cylinder head air bleed bolt to allow air to escape from the system.Tightening torque:Coolant drain bolt:8 N·m (0.8 kgf·m, 5.9 lb·ft)
1. Water pump air bleed boltTightening torque: Water pump air bleed bolt:8 N·m (0.8 kgf·m, 5.9 lb·ft)
1
UB3D7AE0.book Page 28 Tuesday, November 7, 2017 9:38 AM

8-29
8
18. When coolant begins to flow out, tightenthe bleed bolt.
19. Start the engine and let it idle for ten mi- nutes.TIPWhile the engine is idling, check the cooling
system for leaks.
20. Rev the engine five times, then stop theengine and allow it to cool.TIPWhile waiting for the engine to cool, clean up
the used coolant and prepare it for disposal
according to local regulations. 21. When the engine is cool, remove the radi-
ator cap and check the coolant level in
the radiator. WARNING! Never attempt
to remove the radiator cap when the
engine is hot.
[EWB04250]
If necessary, add
coolant until the radiator is full. Install the
radiator cap.
22. Check the coolant level in the reservoir and replenish if necessary.
23. Install the panels and the hood.
EBU32400Axle bootsCheck the axle boots for holes or tears.
If any damage is found, have them replaced
by a Yamaha dealer.
1. Cylinder head air bleed boltTightening torque: Cylinder head air bleed bolt:10 N·m (1.0 kgf·m, 7.4 lb·ft)
1
UB3D7AE0.book Page 29 Tuesday, November 7, 2017 9:38 AM

8-30
8
EBU33570Spark plug inspectionRemoval1. Remove the spark plug cap.
2. Use the spark plug wrench in the tool kit to remove the spark plug as shown.
1. Front axle boot
1. Rear axle boot
1
1
1
1
1. Spark plug cap
1
UB3D7AE0.book Page 30 Tuesday, November 7, 2017 9:38 AM

8-31
8
Inspection
The spark plug is an important engine com-
ponent and is easy to inspect. The condition
of the spark plug can indicate the condition of
the engine.
The ideal color of the porcelain insulator
around the center electrode is a medium-to-
light tan for a vehicle that is being ridden nor-
mally.
You should periodically remove and inspect
the spark plug because heat and deposits will
cause the spark plug to slowly break downand erode. If electrode erosion becomes ex-
cessive, or if carbon and other deposits are
excessive, you should replace the spark plug
with the specified plug.
Measure the spark plug gap with a wire thick-
ness gauge and, if necessary, adjust the gap
to specification.1. Spark plug wrench
1
Specified spark plug:
NGK/CPR7EA-91. Spark plug gap
1
UB3D7AE0.book Page 31 Tuesday, November 7, 2017 9:38 AM