Figure 7. Old vs. New Fuel Return Hose with Orifice Fitting

Figure 3. Exploded View of Flyweight Springs

TM-5-3820-256-24-5 Drilling System Well Rotary Truck Mounted Air Transportable 600 Feet Capacity Model LP-12 NSN 3820-01-246-4276 Manual
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SERVICE MANUAL CLEANING AND INSPECTION Section 3 CAMSHAFT Injection pump part numbers 1 802 604 C91, 1 802 605 C91, 1 802 606 C91, 1 802 607 C91, 1 802 608 C91, 1 802 643 C91 and 1 802 995 C91 were built with old style camshaft (Figure 6) and old style fuel return hose with a .062 in. diameter orifice (Figure 7). If camshaft replacement is required order new style camshaft (IH P/N 1 806 505 C1) and new style fuel return hose with a .046 in. diameter orifice (IH P/N 1 806 503 C1). The new camshaft provides improved fuel supply pump performance and the reduced orifice diameter is required to maintain appropriate fuel return flow to the tank and internal fuel injection pump housing pressures. IMPORTANT THE NEW CAMSHAFT (1 806 505 C1) MUST USE THE FUEL RETURN HOSE WITH .046 IN. DIAMETER ORIFICE (1 806 503 C1). CONVERSELY THE OLD CAMSHAFT (691 248 C1) MUST USE THE FUEL RETURN HOSE WITH .062 IN. DIAMETER ORIFICE (1 802 897 C1). NOTE: With the new camshaft and fuel return hose added to any of the injection pumps listed above it becomes a C92 suffix pump. This is important when determining correct supply pump pressure on individual pump data sheets (Section 5 - Calibration). Figure 6. Camshaft Identification Figure 7. Old vs. New Fuel Return Hose with Orifice Fitting CGES-375 Printed in United States of America Page 4

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