Kubota M8540 Workshop Manual page 165

M8540, M9540, WSM
Selecting Cylinder Head Gasket
Replacing the Cylinder Head Gasket
1. Make sure to note the notch (a), (b) or (c) of cylinder head gasket
(1) in advance.
2. Replace the same notch (a), (b) or (c) as the original cylinder
head gasket (1).
Selecting the Cylinder Head Gasket
• Select the cylinder head gasket (1) thickness to meet with the top
clearance when replacing the piston, piston pin bush, connecting
rod or crankpin bearing.
1. Measure the piston head's protrusion or recessing from the
crankcase cylinder face 4 spots per each piston and (average of
four pistons) using the dial gauge as shown in figure.
2. Select the suitable cylinder head gasket refer to the table below.
Thickness of cylinder
Notch of head gasket
Cylinder
Head
Before After
Gasket
tightening tightening
2 notches 0.90 mm 0.80 mm
(a) 0.035 in. 0.031 in.
1 notch 1.00 mm 0.90 mm
(b) 0.0394 in. 0.035 in.
Without 1.05 mm 0.95 mm
notch (c) 0.0413 in. 0.037 in.
(1) Cylinder Head Gasket
(2) Measuring Point
(A) Gear Case Side
(B) Flywheel Side
Valve
1. Remove the valve spring collets (1) after compressing the valve
spring (3) with the valve spring retainer (2).
(When reassembling)
• Install the valve spring with its small-pitch end downward (at the
head side).
• Wash the valve stem and valve guide hole, and apply engine oil
sufficiently.
• After installing the valve spring collets, lightly tap the stem to
assure proper fit with a plastic hammer.
(1) Valve Spring Collet
(2) Valve Spring Retainer
(3) Valve Spring
(4) Valve Stem Seal
(5) Valve
(6) Arm Bridge
1-S42
ENGINE
Piston Head's
protrusion or
recessing from the
Part Code
level of crankcase
cylinder face.
(average of 4 pistons)
-0.07 to +0.049 mm
1G514-03310
-0.0028 to +0.0019 in.
+0.050 to +0.149 mm
1G514-03600
+0.0020 to +0.0058 in.
+0.150 to +0.20 mm
1G514-03610
+0.0059 to +0.0078 in.
(a) 2 Notches
(b) 1 Notch
(c) Without Notch
W1022965
(7) Large Pitch
(8) Smaller Pitch
(9) Install the spring with its smaller-
pitch end downward (at the head
side)
W1053044
KiSC issued 09, 2008 A