N14 Base Engine Troubleshooting and Repair Manual – 004-014   Push Rods or Tubes

Table of Contents

Remove
Inspect for Reuse
Install

Remove

TOC

Remove the rocker lever covers. Refer to Procedure

003-011-002.

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Remove the rocker lever assemblies. Refer to Procedure

003-009-002.

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Remove the push rods.

NOTE: To prevent increased wear, mark each push rod as it is removed so it can be installed back in its original location.

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Inspect for Reuse

TOC

Inspect for engine oil in the push rods as follows:

  • Hold the push rod horizontally and drop it from a height of 6 inches onto a concrete floor or a metal surface.
  • The push rod can be used if a ringing sound is heard.
  • If a dull (or non-ringing) sound is heard, the push rod contains engine oil and

    must
    be discarded.

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Inspect the straightness of the push rod by rolling it on a level bench. Replace the push rod if it is bent. Do

not
use a bent push rod.

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Visually inspect the socket end of the push rod for uneven wear, scratches, or separation of the insert from the tube.

If a worn push rod is found, the mating adjusting screw

must
also be replaced.

When parallel scratches are found in the contact area, the push rods

must
be replaced.

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Visually inspect the ball end of the push rod.

The contact area

must
show a smooth seating pattern.

If the ball end of the push rod has parallel grooves and scratches or a nipple in the center, the push rod

must
be replaced. If a worn push rod is found, the mating cam follower socket

must
be replaced. Refer to the Engine Shop Manual for cam follower rebuild instructions.

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Install

TOC

Use clean 15W-40 oil to lubricate the ball end of the push rods.

NOTE: The injector push rods (1) are larger in diameter than the valve push rods (2).

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Install the push rods into the corresponding numbered location.

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Visually inspect the adjusting screw. The contact area

must
be smooth with an even seating pattern.

If parallel scratches are found in the contact area, the adjusting screw

must
be replaced. This condition is normally found with worn push rods that will also require replacement.

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 CAUTION 

If the adjusting screws protrude beyond the maximum listed below, the push rods can be damaged when the housing capscrews are tightened. Do not attempt to install the rocker lever shaft assemblies again without resetting the lash.

Loosen the rocker lever adjusting screws so there is a maximum of 32 mm [1.250 inch] from the top surface of the lever and the ball end of the adjusting screw.

 
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Install the rocker lever assemblies. Refer to Procedure

003-009-026.

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Adjust the valves and the injectors. Refer to Procedure

003-004-029.

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Install the rocker lever cover gasket. The rocker lever cover gaskets can be used again if

not
damaged.

Install the rocker lever covers. Refer to Procedure

003-011-026.

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Last Modified:  12-May-2003