Lubrication System/Oil By-Pass Valve CTM3274 (01JUL99) 25-26 Saran Liter Engines 060799 PN=187 OIL BY-PASS VALVE REPLACEMENT 1. Remove timing gear cover and front plate. 2. Remove oil by-pass valve and spring. Inspect valve -UN-09NOV88 and spring for damage. IMPORTANT: By-pass valves and springs of two lengths may be installed on engine. Check the relationship between cylinder T87436 block bore depth (C), valve length (B) and free length of spring (A) as indicated in the chart. 3. Check spring calibration: • 92 to 112 N (21 to 25 lb) for the longer spring when compressed at 34 mm (1.34 in.) length.
• 79 to 96.5 N (18 to 22 lb) for the shorter spring when compressed at 29 mm (1.14 in.) length. 4. Install oil by-pass valve and spring. 5. Install front plate and timing gear cover. A—Spring length B—Valve length C—Cylinder block bore depth -UN-23JUL96 Y—Longer configuration (earlier engines) Z—Shorter configuration (later engines) CD574P1 CD,3274,G25,21 -19-04JAN99 25 26