90332 Mercury PLATE, SWITCH BOX

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PSP FOR INCORRECTLY ADJUSTED AIR FUEL RATIO CONTROL ON CERTAIN 3208 TRUCK ENGINES - 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-64 TT-4 1278 PS4231 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 "PS4231" as Part Number and "7755" as Group Number. Termination Date
April 30, 1989
Problem
The air fuel ratio control on certain 3208 Truck Engines may have been incorrectly adjusted.
Affected Product
Model Identification Number 3208 2Z36385, 36445, 38473, 38521, 38572, 38623, 38624, 38676, 38729, 38766, 38808, 38848, 38889, 38897, 38918, 38979, 39041, 39134, 39174, 39175, 39225, 39277, 39332, 39333, 39368, 39369, 39379, 39380, 39403, 39413, 39440, 39441, 39450, 39509, 39571, 39602, 39640, 39693, 39741, 39788, 39834, 39920, 40016, 40069, 40114, 40124, 40132, 40138, 40144, 40157, 40165, 40170, 40175, 40179, 40183, 40200, 40209, 40216, 40221, 40224, 40227, 40241, 40269, 40327, 40330, 40342, 40349, 40363, 40374, 40404, 40419, 40443, 40450, 40453, 40465, 40473, 40498, 40544, 40597, 40606, 40648, 40702, 40713, 40752, 40753, 40755, 40758, 40759, 40768, 40771, 40776, 40779, 40794, 40795, 40798-40800, 40812, 40813, 40823, 40824, 40831, 40832, 40848, 40849, 40851, 40854, 40857, 40866, 40869, 40872, 40875, 40877, 40889, 40901, 40902, 40904, 40907, 40909, 40918, 40921, 40924, 40927, 40929, 40932, 40944, 40953, 40964, 40971, 40985, 40993, 41006, 41007, 41010, 41012, 41023, 41058, 41059, 41061, 41065, 41066, 41068, 41075, 41078, 41083, 41106, 41107, 41109, 41112, 41114, 41119, 41124, 41128, 41155, 41157, 41158, 41161-41163, 41168, 41171, 41174, 41178, 41182, 41206, 41207, 41209, 41210, 41217, 41218, 41225, 41226, 41231, 41232, 41236, 41239, 41242, 41245, 41248, 41250, 41252, 41254, 41256, 41258, 41260, 41262, 41264, 41266, 41274, 41275, 41277, 41282, 41286, 41292, 41296, 41298, 41300, 41319, 41320, 41322, 41325, 41326, 41332, 41335, 41336, 41340, 41343, 41346, 41349, 41351, 41370, 41372, 41375, 41376, 41382, 41384, 41387, 41388, 41393, 41395, 41398, 41403, 41406, 41410, 41420-41422, 41424, 41427-41429, 41432, 41434, 41437, 41440, 41443, 41447, 41450, 41451, 41454, 41470, 41472, 41475, 41479, 41482, 41483, 41487, 41490, 41493, 41496, 41498, 41507, 41518, 41520, 41524, 41525, 41531, 41533, 41536, 41537, 41539, 41540, 41544, 41545, 41549, 41550, 41554, 41565, 41570, 41571, 41573, 41576, 41583-41585, 41588, 41592, 41593, 41597, 41598, 41601, 41602, 41605, 41608, 41622, 41624, 41627, 41635, 41640, 41645, 41646, 41649, 41677, 41679, 41688, 41727, 41744, 41770-41773, 41797, 41798, 41808, 41809, 41816, 41822, 41824, 41841, 41854, 41855, 41857, 41868, 41876, 41882, 41905, 41909, 41910, 41911, 41920, 41921, 41924, 41927, 41932, 41934, 41937, 41963, 41965-41967, 41972, 41975, 41977, 41982, 41989, 42001-42004, 42008, 42012-42015, 42017, 42020, 42021, 42024, 42027, 42031, 42034, 42043, 42046, 42048, 42056-42059, 42060, 42067-42069, 42074, 42075, 42079, 42086, 42087, 42091, 42099, 42100, 42103, 42107, 42112, 42113, 42115, 42122-42124, 42129, 42133, 42136, 42147, 42152, 42153, 42167 -42171, 42180-42182, 42188, 42189, 42200, 42204, 42207, 42213-42215, 42218, 42222, 42227-42229, 42231, 42237, 42246, 42261, 42265, 42267, 42269, 42273, 42277-42279, 42281, 42284, 42288-42290, 42297, 42304, 42309, 42313, 42317, 42321, 42326-42329, 42331, 42334, 42335, 42339, 42340, 42341, 42343-42345, 42349, 42350, 42351, 42353, 42354, 42360, 42361, 42366, 42367, 42372, 42373, 42376, 42379, 42381, 42385, 42387, 42390, 42391, 42393, 42397, 42401, 42402, 42404, 42412, 42414, 42418, 42421, 42422, 42424, 42427, 42433, 42439, 42444, 42448, 42452, 42457, 42458, 42461, 42469, 42470, 42473, 42480, 42481, 42484, 42492, 42516, 42524, 42525, 42528, 42536, 42537, 42540, 42548, 42549, 42551, 42559, 42561, 42581, 42584, 42592, 42594, 42599,