5-23
VALVES AND VALVE SPRINGS
ENG
2. Eliminate:
• Carbon deposits
(from the valve face and valve seat)
3. Check:
• Valve face
Pitting/wear
→
Grind the valve face.
• Valve stem end
Mushroom shape or diameter larger than the
body of the valve stem
→
Replace the valve.
4. Measure:
• Valve stem runout
Out of specification
→
Replace the valve.
TIP
• When installing a new valve, always replace
the valve guide.
• If the valve is removed or replaced, always re-
place the valve stem seal.
EAS30285
CHECKING THE VALVE SEATS
The following procedure applies to all of the
valves and valve seats.
1. Eliminate:
• Carbon deposits
(from the valve face and valve seat)
2. Check:
• Valve seat
Pitting/wear
→
Replace the cylinder head.
3. Measure:
• Valve seat contact width “a”
Out of specification
→
Replace the cylinder
head.
a. Apply blue layout fluid “b” onto the valve
face.
b. Install the valve into the cylinder head.
c. Press the valve through the valve guide
and onto the valve seat to make a clear
impression.
d. Measure the valve seat width.
Valve and valve guide clearance = a-b
Valve stem runout
0.020 mm (0.0008 in)
G088960
G088961
Valve seat contact width (intake)
Limit
1.3 mm (0.05 in)
Valve seat contact width
(exhaust)
Limit
1.7 mm (0.07 in)
G088966
G088967
BCWF8197E0.book Page 23 Thursday, November 18, 2021 9:18 AM
Summary of Contents for R15 2022
Page 6: ...BCWF8197E0 book Page 2 Thursday November 18 2021 9 18 AM...
Page 56: ...1 49 GEN INFO SPECIAL TOOLS BCWF8197E0 book Page 49 Thursday November 18 2021 9 18 AM...
Page 109: ...2 52 CABLE ROUTING SPEC ABS System BCWF8197E0 book Page 52 Thursday November 18 2021 9 18 AM...
Page 142: ...3 30 ELECTRICAL SYSTEM CHK ADJ BCWF8197E0 book Page 30 Thursday November 18 2021 9 18 AM...
Page 308: ...5 71 TRANSMISSION ENG BCWF8197E0 book Page 71 Thursday November 18 2021 9 18 AM...
Page 330: ...7 11 THROTTLE BODY FI BCWF8197E0 book Page 11 Thursday November 18 2021 9 18 AM...
Page 333: ...BCWF8197E0 book Page 2 Thursday November 18 2021 9 18 AM...
Page 344: ...8 11 CHARGING SYSTEM ELEC BCWF8197E0 book Page 11 Thursday November 18 2021 9 18 AM...
Page 348: ...8 15 LIGHTING SYSTEM ELEC BCWF8197E0 book Page 15 Thursday November 18 2021 9 18 AM...
Page 360: ...8 27 COOLING SYSTEM ELEC BCWF8197E0 book Page 27 Thursday November 18 2021 9 18 AM...
Page 488: ...8 155 ELECTRICAL COMPONENTS ELEC BCWF8197E0 book Page 155 Thursday November 18 2021 9 18 AM...
Page 495: ...BCWF8197E0 book Page 1 Thursday November 18 2021 9 18 AM...
Page 496: ...1Y245 SM 01 1578 10 21 E BCW F8197 E0 BCWF8197E0 book Page 2 Thursday November 18 2021 9 18 AM...