Disassembling The Crankcase; Checking The Crankcase; Checking The Bearing And Oil Seals; Assembling The Crankcase - Yamaha FZ1-N Service Manual

EAS25550

DISASSEMBLING THE CRANKCASE

1. Place the engine upside down.
2. Remove:
• Crankcase bolts
NOTE:
• Loosen each bolt 1/4 of a turn at a time, in
stages and in a crisscross pattern. After all of
the bolts are fully loosened, remove them.
• Loosen the bolts in decreasing numerical
order (refer to the numbers in the illustration).
• The numbers embossed on the crankcase
indicate the crankcase tightening sequence.
M9 x 105 mm (4.1 in) bolts: "1" – "10"
M8 x 60 mm (2.4 in) bolt: "11" LOCTITE®
M8 x 60 mm (2.4 in) bolts: "12", "16"
M6 x 70 mm (2.8 in) bolts: "19", "21", "23"
M6 x 65 mm (2.5 in) bolts: "17", "18"
M6 x 60 mm (2.4 in) bolt and washer: "22"
M6 x 60 mm (2.4 in) bolts: "24", "25"
M6 x 50 mm (2.0 in) bolts: "20", "26"
M8 x 50 mm (2.0 in) bolts: "13" – "15"
3. Remove:
• Lower crankcase
ECA13900
CAUTION:
Tap on one side of the crankcase with a
soft-face hammer. Tap only on reinforced
portions of the crankcase, not on the
crankcase mating surfaces. Work slowly
and carefully and make sure the crankcase
halves separate evenly.
4. Remove:
• Dowel pins
5. Remove:
• Crankshaft journal lower bearing
(from the lower crankcase)
NOTE:
Identify the position of each crankshaft journal
lower bearing so that it can be reinstalled in its
original place.
EAS25580

CHECKING THE CRANKCASE

1. Thoroughly wash the crankcase halves in a
mild solvent.
2. Thoroughly clean all the gasket surfaces
and crankcase mating surfaces.
3. Check:
• Crankcase
Cracks/damage → Replace.
• Oil delivery passages
Obstruction → Blow out with compressed
air.
ET2D1014

CHECKING THE BEARING AND OIL SEALS

1. Check:
• Bearings
Clean and lubricate the bearings, then
rotate the inner race with your finger.
Rough movement → Replace.
2. Check:
• Oil seals
Damage/wear → Replace.
EAS25650

ASSEMBLING THE CRANKCASE

1. Lubricate:
• Crankshaft journal bearings
(with the recommended lubricant)
Recommended lubricant
Engine oil
2. Apply:
• Sealant
Yamaha bond No. 1215
(Three Bond No.1215®)
90890-85505
NOTE:
Do not allow any sealant to come into contact
with the oil gallery or crankshaft journal bear-
ings. Do not apply sealant to within 2–3 mm
(0.08–0.12 in) of the crankshaft journal bear-
ings.
5-68
CRANKCASE