Briggs & Stratton 130G00, Repair Manual

Page: 54 / 112

Not for
Reproduction
3. Check the cylinder head to cylinder mating surface for
warpage or distortion. Discard the cylinder head if any
low spot is 0.004 inches (0.10 mm) or more. Proceed
as follows:
A. See A of Figure 53. With the combustion chamber
side facing up, set a straightedge diagonally across
the length of the cylinder head gasket surface.
B. Slide a feeler gauge beneath the straightedge to
check for warpage.
C. Check the opposite diagonal to verify that the
gasket surface is flat.
D. See B of Figure 53. Set a straightedge vertically
across the length of the cylinder head gasket
surface. Use feeler gauge to check for warpage.
Repeat step on opposite side.
E. See C of Figure 53. Set a straightedge horizontally
across the length of the cylinder head gasket
surface. Use feeler gauge to check for warpage.
Repeat step on opposite side.
53
4. Repeat the 6 point check outlined under step 3 to check
for warpage or distortion of the cylinder head to valve
cover mating surfaces. Be sure to check both the
cylinder head and valve cover. Discard the cylinder
head or valve cover if any low spot is 0.004 inches
(0.10 mm) or more.
5. Visually inspect the cylinder head for cracks or
discoloration due to excessive heat. Replace cylinder
head if either of these conditions are found.
6. Verify that breather hole, and intake and exhaust ports
are clean and open.
Valve Guides
1. Inspect external surface of valve guides for cracks
(particularly the combustion chamber side). Replace
the cylinder head if cracks are found.
2. To verify cleanliness, lightly hone bore using a suitable
valve guide hone and then scrub with a valve guide
cleaning brush to remove any dirt or debris.
3. Measure the inside diameter using an inside ball
micrometer or plug gauge. Replace the cylinder head
if the measurement is 0.220 inches (5.58 mm) or more.
Valve Seats
1. Inspect valve seats for cracking, chipping or burning.
Replace cylinder head if any of these conditions are
found or if either valve seat is loose.
Valves
1. Replace the valve if bent or if there is evidence of
burning or cracking.
2. Inspect the end of the valve stem for pitting or uneven
wear. Replace the valve if either of these conditions are
found.
3. Inspect the valve stem retainer groove for burrs,
damage or excessive wear. Remove burrs with a fine
tooth file if found.
4. Polish the valve stem with fine emery cloth or steel wool
to remove carbon buildup.
5. See Figure 54. Measure the top, center and bottom of
the intake valve stem using an outside micrometer.
Replace the intake valve if any measurement is at the
reject size shown.
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