ENGINE
EA330-E4, WSM
1-S45
Valve Recessing
1. Clean the cylinder head, the valve face and seat.
2. Insert the valve into the guide.
3. Measure the valve recessing "A" with a depth gauge.
4. If the recession exceeds the allowable limit, replace the valve.
In addition, repair the cylinder head seat surface with a valve
seat cutter or valve seat grinder, and then repair the head
surface with a surface grinder. Or, replace the cylinder head.
9Y1211018ENS0072US0
Width of Contact between Valve and Valve Seat
1. Check the contact between the valve face and valve seat.
2. When parts are not contacting evenly, or the contact width "A"
(See figure) is extremely wide, repair or replace the valve and
cylinder head seat, rub and refit parts to each other applying an
appropriate amount of compound.
9Y1211018ENS0073US0
Correcting Valve Face Angle
1. Correct the valve seat to the factory specification with a valve
seat cutter or a valve seat grinder.
2. Correct the valve using a valve refacer.
9Y1211018ENS0074US0
Valve recessing
(IN and EX)
Factory specification
0.80 to 0.90 mm
0.032 to 0.035 in.
Allowable limit
1.5 mm
0.059 in.
A: Valve recessing
Valve seat width Factory specification
2.1 mm
0.083 in.
A: Contact Width
Valve seat angle
Factory specification
0.785 rad
45.0 °
Valve face angle
0.786 to 0.794 rad
45.0 to 45.5 °
(1) Valve
(2) Corrected Valve Seat
(3) Valve Refacer
(a) 0.26 rad (15 °)
(b) 0.79 rad (45 °)
To Next Page
