This document is printed from SPI². Not for RESALE
Illustration 59 g01201916
Typical example
1. Ensure that the face of the valves are clean.
Ensure that the bottom face of the cylinder head is
clean. Ensure that the cylinder head is not
distorted. Refer to Systems Operation, Testing and
Adjusting, “Cylinder Head - Inspect” for the
procedure to measure flatness of the cylinder
head.
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. For the minimum and maximum limits for a new
engine for the inlet valves and the exhaust valves,
refer to Specifications, “Cylinder Head”.
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
For the wear limits for the inlet valves and exhaust
valves, refer to Specifications, “Cylinder Head”.
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 Systems
Operation, 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.
i04483849
Valve Guide - Inspect
Perform this test in order to determine if a valve guide
should be replaced.
Illustration 60 g00314806
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 mm (0.591 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.
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. Refer to Specifications, “Cylinder
Head Valves” for the clearances.
66 UENR0623
Air Inlet and Exhaust System
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