Clean all parts with PD-680, Type Ill, or equivalent, and dry with compressed air.
Check the plungers, stops, springs, and housing bores for evidence of wear, scoring, or distortion; replace all
parts that show visual evidence of wear, scoring, or distortion.
REGULATOR VALVE ASSEMBLY. See Figure 8-1.
Install regulator valve plunger (9), regulator valve spring (8), and valve plunger guide (7) into regulator valve
housing (1 0). Secure with roll pins (6).
Install the pressure regulator (items 7 through 10) in the lube oil filter head (24) as an assembly. Using a
new cover gasket (5), install valve housing cover (4) and secure with lockwashers (3) and capscrews (1 and
2). Cross-tighten the capscrews in accordance with Table 1-2.
Install valve housing (17), by-pass valve spring (15), and relief plunger (16) into bore of lube oil filter head
(24). Secure by installing a new valve cover gasket (14), by-pass valve cover (13), capscrews (11), and
lockwashers (12). Cross-tighten the capscrews in accordance with Table 1-2.
Lubricate preformed packing (23) with dean engine lubricating oil and position it on pressure regulator stop
Install piston cooling plunger (22), piston cooling spring (21), and pressure regulator stop (20) into bore of the
lube oil filter head (24). Secure with internal retaining ring (19).
SECTION II. LUBE OIL COOLER
GENERAL. The lube oil cooler is located between the left and right cylinder head banks. Oil from the lube
oil pump is routed through the finned elements of the lube oil cooler. The elements are immersed in coolant which
absorbs the heat conducted through the element.
LUBE OIL COOLER REMOVAL . Drain engine coolant and oil in accordance with the Operator and
Organizational Maintenance Manual. Remove the after-coolers in accordance with paragraph 9-42. Then see Figure 8-2
and proceed as follows:
Remove the self-locking nuts (1) that secure the lubricating oil elements (10) in the rear header covers (7).
Remove front and rear cover capscrews (2 and 3) and lockwashers (4 and 5). Insert capscrews (2 and 3)
into the jacking screw holes provided in the rear of each cover (6 and 7). Remove front water cover (6) and
rear header cover (7). Remove and discard gaskets (8 and 9).
Replace the self-locking nuts (1) and remove the lubricating oil cooler elements (1 0). Remove and discard
the gaskets (11) and preformed packings (12).
LUBE OIL COOLER ELEMENT CLEANING AND INSPECTION.
Cleaning compound M1S36426 is flammable and toxic to the side,
eyes, and respiratory tract. Skin, eye, and respiratory protection is
required to avoid injury to personnel. Use only with a dosed
circuit, reverse flushing machine.
If any type of engine failure has occurred that might leave metal
particles In the oil cooler elements, the elements will be difficult or
impossible to clean successfully and must be replaced. Engine
failure will result from reusing contaminated oil cooler elements.
a. Cleaning. To prevent the hardening and drying of foreign substances, clean the elements (10, Figure 8-2)
immediately after removal as follows:
Reverse flush the elements using cleaning compound MS36426.