Valve Guide - Inspect - Perkins 1104D NH1 Systems Operation Testing And Adjusting

RENR7967
2. Use the Tooling (A) to check the depths of the inlet
valves and the exhaust valves below the face of
the cylinder head. Use Tooling (B) to zero Tooling
(A).
3. Measure the depth of the inlet valve and the
exhaust valve below the cylinder head face. The
minimum and maximum limits for a new engine
follow:
Inlet valves
Minimum .................. 0.905 mm (0.0356 inch)
Maximum ................. 1.163 mm (0.0458 inch)
Exhaust valves
Minimum .................. 0.876 mm (0.0345 inch)
Maximum ................. 1.131 mm (0.0445 inch)
4. Service wear occurs on an engine which has
been in operation. If the valve depth below the
cylinder head face on a used engine exceeds
the specification for service wear, the following
components must be replaced.
•
Valves
•
Valve inserts
Wear limit for inlet valves .. 1.41 mm (0.0555 inch)
Wear limit for exhaust valves ................. 1.38 mm
5. Check each valve for cracks. Check the stems of
the valves for wear. Ensure that the valves are
the correct fit in the valve guides. Refer to Testing
and Adjusting, "Valve Guide - Inspect" for the
procedure to inspect the valve guides.
6. Check the load on the valve springs. Refer to
Specifications, "Cylinder Head Valves" for the
correct lengths and specifications for the valve
springs.

Valve Guide - Inspect

Perform this test in order to determine if a valve guide
should be replaced.
Illustration 57
Measure the radial movement of the valve in the valve guide.
(1) Valve guide
(2) Radial movement of the valve in the valve guide
(3) Valve stem
(4) Dial indicator
(5) Valve head
1. Place a new valve in the valve guide.
2. Place a dial indicator with a magnetic base on the
face of the cylinder head.
3. Lift the edge of the valve head to a distance of
15.0 mm (0.60 inch).
4. Move the valve in a radial direction away from the
dial indicator. Make sure that the valve moves
away from the dial indicator as far as possible.
(0.0543 inch)
Position the contact point of the dial indicator on
the edge of the valve head. Set the position of the
needle of the dial indicator to zero.
5. Move the valve in a radial direction toward the dial
indicator as far as possible. Note the distance of
movement which is indicated on the dial indicator.
If the distance is greater than the maximum
clearance of the valve in the valve guide, replace
the valve guide.
The maximum clearance for the inlet valve stem
in the valve guide with a valve lift of 15.0 mm
(0.60 inch) is the following value. ........... 0.08 mm
i02400035
The maximum clearance for the exhaust valve
stem in the valve guide with a valve lift of 15.0 mm
(0.60 inch) is the following value. ........... 0.09 mm
Testing and Adjusting Section
g00314806
(0.0031 inch)
(0.0035 inch)
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