1-S12
GR1600EC2, WSM
ENGINE
Valve Clearance
• The valve clearance must be checked and adjusted when
engine is cold.
1. Remove the cylinder head cover (1) and the glow plugs.
2. Align the “1TC” mark (2) on the flywheel and alignment mark (3)
on the rear end plate so that the No. 1 piston comes to the
compression top dead center.
3. Check the following valve clearance marked with “★” using a
thickness gauge.
[When No.1 piston is at the compression top dead center
position]
4. If the clearance is not within the factory specifications, adjust with
the adjusting screw.
5. Then turn the flywheel 6.28 rad (360 °), and align the “1TC” mark
(2) on the flywheel and alignment mark (3) on the rear end plate
so that the No. 1 piston comes to the overlap position.
6. Check the following valve clearance marked with “✩” using a
thickness gauge.
[When No.1 piston is at the overlap position]
7. If the clearance is not within the factory specifications, adjust with
the adjusting screw.
• The sequence of cylinder numbers is given as No. 1 and No.
2 starting from the gear case side.
• After adjusting the valve clearance, secure the adjusting
screw with the lock nut.
W10172470
Cylinder No. No.1 No.2
Intake valve ★
Exhaust valve ★★
Cylinder No. No.1 No.2
Intake valve ✩
Exhaust valve
Intake and exhaust
valve clearance (Cold)
Factory spec.
0.145 to 0.185 mm
0.00571 to 0.00728 in.
(1) Cylinder Head Cover
(2) “1TC” Mark
(3) Alignment Mark
A : Gear Case Side
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