M11 Series – Service Manual – 007-021   Lubricating Oil High Pressure Relief Valve

Drain the lubricating oil.

Refer to Procedure 007-025.

Remove the oil pan.

Refer to Procedure 007-025.

Measure the installed depth of the relief valve retainer cup plug.

NOTE: If the plug depth is

not within the specifications given, remove the high-pressure regulator assembly and inspect the parts.

WARNING  Use caution while removing the retainer plug (1). The pressure relief valve spring (2) is under compression. Personal injury can result. Wear face and eye protection.

Use light-duty puller kit, Part No. 3375784, or equivalent to remove the retainer plug (1).

Remove the pressure relief valve spring (2), washer (3), and valve disc
(4).

Inspect the parts for damage.

Use a spring compression tester, Part No. 3375182, to measure the relief valve spring tension.

Compress the spring to 29.1-mm [1.15-in] height. The force required to compress the spring

must be:

Measure the relief valve seat depth in the cylinder block.

If the relief valve seat is

not at the specified depth or is loose or

not level in the cylinder block, the seat

must be removed and inspected. Use puller kit, Part No. 3375784, to remove the seat.

If the seating surfaces are free of indentations, the seat can be reused. If the surfaces have indentations, the seat

must be replaced. Use relief valve seat driver, Part No. 3376486, to install the seat.

Install the valve disc (4), washer (3) and spring (2).

Use flat washers equal to 5 mm [0.197 in] with plug driver, Part No. 3376489, to install the new retainer cup plug (1).

Measure the retainer plug depth in the cylinder block.

Install the oil pan.

Refer to Procedure 007-025.

Fill the engine with clean 15W-40 oil.

Refer to Procedure 007-025.

NOTE: Engine oil pressure

must be indicated on the gauge within 15 seconds after starting. If oil pressure is

not registered within 15 seconds, shut off the engine immediately to avoid engine damage. Confirm the correct oil level in the oil pan.

Operate the engine at idle speed for 3 minutes to inspect for leaks.