0554208 JOHNSON .VALVE, Throttle

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PSP FOR INSTALLING UNIT INJECTOR ROCKER ARMS, EXHAUST VALVE ROCKER ARMS, AND PISTON CROWNS IN CERTAIN 3176 TRUCK ENGINES - PS4 375 - MAILED US AND CANADA, TRUCK TEPS
  The information supplied in this service letter may not be valid after the termination date of this program.   Do not perform the work outlined in this Service Letter after the termination date without first contacting your Caterpillar product analyst.
U-207 TT-15 1123 PS4375 This Program can be administered either before or after a failure. In either case the decision whether to apply the Program is made by the dealer. When reporting the repair, use "PS4375" as Part Number, "7755" as Group Number, and "96" as Description Code. Although this Program is to be administered as described above on the Affected Product, parts should be removed from parts stock as soon as possible. If possible, this Program is to be implemented at the same time as the August 7, 1989 Service Letter - PI3419. Implement both portions of this Program at the same time if applicable. Termination Date
October 31, 1990
Problem
***** Group 1 ***** The rocker arms for the exhaust valves may fail and the piston crown bushings may rotate and cause scuffing on certain 3176 Truck Engines. ***** Group 2 ***** The retaining cup on the unit injector rocker arm could loosen and fall down around the push rod on certain 3176 Truck Engines.
Affected Product
Model Identification Number ***** Group 1 ***** 3176 2YG1-1690, 1692-1696, 1698-1710, 1712-1725, 1727, 1729, 1731- 1736, 1738-1765, 1767-1773, 1775, 1777-1780, 1782-1783, 1785-1811, 1813, 1815, 1816, 1818-1846, 1848, 1851-1868, 1870-1882, 1884-1892, 1894, 1897, 1899-1903, 1905-1911, 1913-1916, 1918, 1919, 1922-1932, 1934-1946, 1948-1952, 1954-1958, 1960-1964, 1966, 1967, 1969, 1971-1978, 1981- 1983, 1985-1987, 1989, 1992, 1994-2011, 2014, 2015, 2018, 2019, 2021-2023, 2025-2028, 2030-2037, 2039-2042, 2045-2049, 2052-2056, 2058-2061, 2064, 2066-2069, 2072, 2073, 2075- 2077, 2079-2084, 2087-2088, 2090, 2092-2094, 2096, 2097, 2099, 2100, 2103-2109, 2111, 2112, 2114, 2116, 2118, 2119, 2121, 2123-2130, 2132-2136, 2139, 2140, 2142-2146, 2148, 2151, 2152, 2154, 2156, 2157, 2159, 2160, 2164-2166, 2168- 2171, 2173, 2175-2179, 2181-2186, 2188, 2191-2194, 2196, 2197, 2199, 2202-2205, 2207-2209, 2211, 2213, 2215, 2217- 2219, 2221-2228, 2230-2231, 2233-2235, 2237, 2238, 2240, 2242-2245, 2247, 2248, 2250, 2251, 2253-2255, 2258-2261, 2264, 2266-2270, 2272-2283, 2285-2300, 2303-2313, 2315-2317, 2319-2325, 2327, 2328, 2330-2334, 2337, 2339, 2340, 2342- 2346, 2348-2363, 2365, 2370-2372, 2374-2386, 2388-2392, 2395, 2397-2399, 2402, 2404-2408, 2410, 2412, 2413, 2415- 2419, 2421-2429, 2431, 2434-2439, 2441, 2442, 2444, 2446- 2474, 2476-2478, 2480-2485, 2487, 2488, 2490, 2491, 2493- 2498, 2500-2518, 2520-2527, 2530, 2531, 2533-2539, 2542, 2543, 2545, 2547, 2549-2552, 2554, 2557-2565, 2567-2569, 2571-2577, 2579, 2580, 2582, 2584, 2587-2590, 2592-2606, 2608-2614, 2616, 2618, 2619, 2621-2623, 2625-2645, 2647- 2649, 2651, 2653-2655, 2657, 2658, 2660, 2662, 2664, 2666, 2668, 2670-2674, 2676-2679, 2681, 2683, 2685, 2687-2694, 2697-2699, 2701-2704, 2706-2725, 2727-2745, 2747-2767, 2769- 2773, 2775-2779, 2781-2791, 2793, 2794, 2796, 2798-2804, 2806-2812, 2814, 2815, 2817, 2819, 2820, 2822-2826, 2828- 2830, 2832-2839, 2841-2847, 2849-2854, 2856, 2858-2863, 2865-2869, 2871-2873, 2875-2877, 2879, 2881, 2883, 2886- 2888, 2890, 2891, 2893-2898, 2900-2903, 2906-2912, 2914, 2915, 2917, 2918, 2921-2925, 2927-2929, 2931-2934, 2936-2942, 2944-2950, 2952-2955, 2957, 2959, 2962, 2964, 2967-2970, 2973-2975, 2977,