1D-38 Engine Mechanical: For M16A Engine with VVT
Valves and Valve Guides Inspection
S5JB0A1416026
Valve Guide
Valve stem-to-guide clearance
Using a micrometer and bore gauge, take diameter
readings on valve stems and guides to check stem-to-
guide clearance.
Be sure to take reading at more than one place along the
length of each stem and guide.
If clearance exceeds limit, replace valve and valve
guide.
Valve stem and valve guide specification
Valve stem end deflection
If bore gauge is not available, check end deflection of
valve stem with a dial gauge instead.
Move stem end in directions (1) and (2) to measure end
deflection.
If deflection exceeds its limit, replace valve stem and
valve guide.
Valve stem end deflection limit
In: 0.14 mm (0.005 in.)
Ex: 0.18 mm (0.007 in.)
Valve
Visual inspection
• Remove all carbon from valves.
• Inspect each valve for wear, burn or distortion at its
face and stem end, as necessary, replace it.
• Inspect valve stem end face for pitting and wear. If
pitting or wear is found there, valve stem end may be
resurfaced, but not too much to grind off its chamber.
When it is worn out too much that its chamber is gone,
replace valve.
Valve head thickness
Measure thickness “a” of valve head. If measured
thickness exceeds limit, replace valve.
Valve head thickness “a” (In and Ex)
Standard: 1.25 – 1.55 mm (0.049 – 0.061 in.)
Limit: 0.9 mm (0.035 in.)
Item
Standard
Limit
Valve stem
diameter
[A]
In
5.465 – 5.480 mm
(0.2150 – 0.2157 in.)
—
Ex
5.440 – 5.455 mm
(0.2142 – 0.2148 in.)
—
Valve guide
bore [B]
In & Ex
5.500 – 5.512 mm
(0.2165 – 0.2170 in.)
—
Stem-to-
guide
clearance
In
0.020 – 0.047 mm
(0.0008 – 0.0018 in.)
0.070 mm
(0.0028 in.)
Ex
0.045 – 0.072 mm
(0.0017 – 0.0028 in.)
0.090 mm
(0.0035 in.)
I3RM0A140035-01
IYSQ01141096-01
I2RH01140135-01
I2RH0B140102-01
www.CarGarage.ir
www.CarGarage.ir
www.CarGarage.ir
