6.7L Cummins Cylinder Head – Valve Guide Seal, Cylinder Head – Install

Install new valve stem seals of the same color as removed and in the same location. See the General Information
section of this procedure for valve stem seal identification.
Lubricate the valve stems with clean SAE 15W-40 engine oil before installation.
Install new valve stem seals using a valve stem installation tool, Part Number 3164055.

Install the valve springs and valve spring retainer.

Use the valve spring compressor, Part Number 3164329, to compress the valve springs.
Position the replacer screw (4) above the injector bore and install the two capscrews (5) in the cylinder head, where
the hold-down clamp screws were removed.
Tighten the capscrews (5).
Torque Value: 5 Nโ€ขm [ 44 in-lb ]

NOTE: The valves are not evenly spaced from the injector bore. It is important to align the slots in the valve spring
compressor plate with the valve springs.
Apply anti-seize compound to the replacer screw (4) threads. Always read and follow label precautions.
Position the valve spring compressor plate (1) on the replacer screw (4) and align the slots in the valve spring
compressor plate with the valve springs.
Install the washer (3) and nut (2) on the replacer screw (4).

NOTE: Because there is a gap between the top of the piston and the valve face, it may be necessary to use a
second magnet to pull the valve stem up to install the valve collets.
Compress the valve springs until the valve collets can be installed.
Install the valve collets.
Service Tip: Use Assembly Lube, Part Number 3163087 or equivalent, on the valve collets to help hold them in
place until the valve spring compressor is released.
Remove the valve spring compressor service tool.

Use the marks made previously on the vibration damper/ crankshaft speed indicator to rotate the engine clockwise
to put the next group of cylinders at TDC.

After rotating the engine to the next group of cylinders, hit the valve stems of the cylinders previously worked on with
a plastic hammer to make sure the collets are seated.
Repeat the previous steps until all of the valve stem seals have been replaced.