Category Archives: 6.7L Cummins

Use the following procedure if the crankcase ventilation filter housing requires disassembly and/or the filter requires replacement. Refer to Procedure 003-021 in Section 3.  

Disconnect the crankcase ventilation filter oil drain tube from the crankcase ventilation filter housing. Remove the crankcase ventilation filter oil drain tube from the cylinder block by holding the tube near the connection point at the cylinder block and pulling upward. The insert in the cylinder block may stay in the cylinder block when the… Read More »

Depending on the application, two different breather systems are used. • An internal system, which is a part of the rocker lever cover assembly. • An external system, which mounts at the rear of the engine above the flywheel housing. Both systems are closed crankcase breather systems, meaning the crankcase gases are vented into the… Read More »

A new gasket must be installed. Do not reuse an old gasket. Install the head gasket.  

NOTE: Cylinder head gaskets can not be reused. A new cylinder head gasket must be used. Clean the cylinder block and cylinder head combustion deck. Inspect and measure the cylinder block and cylinder head combustion deck flatness. Refer to Procedure 002-004 in Section 2.  

Remove the cylinder head gasket.

A specific head gasket with an increased thickness is not available for combustion deck resurfacing of the cylinder block or cylinder head. If the combustion deck can not be resurfaced such that the correct specifications can be maintained, the block and/or cylinder head must be replaced. Refer to Procedure 001-026 in Section 1. Refer to… Read More »

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.… Read More »

Clean the seal tower and valve stem with contact cleaner, Part Number 3824510. Inspect the exposed valve stem for scoring or heavy polishing. Inspect the valve collet grooves for wear. If the valve stem is damaged, the cylinder head must be removed and the valve replaced. Refer to Procedure 002-004 in Section 2. Inspect the… Read More »

NOTE: In order to remove the valve springs with the cylinder head installed, the piston of the cylinder being worked on must be brought to top dead center (TDC) to support the valves. Use barring tool, Part Number 3824591, to rotate the piston to the TDC of the cylinder being worked on. TDC can be… Read More »