2000/12/01 Caterpillar

The Oil Seals Have Been Removed From The Exhaust Valves {1100}

Usage:

3512 1LM

Engines: Commercial
All 3500 Diesel

Description of Change: The oil seals have been removed from the exhaust valves in the basic cylinder head groups that are used on 3500 Commercial Engines. This oil seal has been removed in order to help prevent the buildup of deposits on the exhaust valve stem. These deposits may occur on engines that operate for extended periods of time with the following conditions:

Temperatures that are below 0 °C (32 °F)
Low loads
Low RPM

Adaptable To: The 137-6856 Seals (Oil) have been removed from the exhaust valves in the basic cylinder head groups that are used on 3500 Commercial Engines. This change is effective with the commercial engines that are listed in Table 1.

Cylinder heads that do not include oil seals on the exhaust valves should be used for top end overhauls and major overhauls. The cylinder heads without oil seals on the exhaust valves can be used individually for repair of cylinder head damage. When a cylinder head is rebuilt, that cylinder head should not include oil seals on the exhaust valves. Remanufactured cylinder heads that have date codes from UUNN (November 2000) and later than November 2000 do not include oil seals on the exhaust valves. Table 2 provides part numbers for the basic cylinder head groups.

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Table 1
Engine Serial Number For Removal Of The 137-6856 Seal (Oil)
Model	MUI Engine Serial No.	EUI Engine Serial No.	B Series Engine Serial No.
3508 Industrial	95Y1127, 68Z1154		S/N:CBB120
3508 Marine	96Y1981, 69Z875	3PS197	S/N:7SM419, 8KN416, 2BM153, 3DM207, 1TW272, 3DW162
3508 Generator Set	23Z7770, 70Z1061	S/N:5XM32, 3LS228	S/N:6PN716, 4GM656, 2HW162
3508 Vehicular	97Y733
3508 Locomotive			5PS265
3508 Military	S/N:3HM15, 9WN16		S/N:BAG10
3508 Captive Generator Set	S/N:1JZ221		S/N:1FZ600
3512 Industrial	S/N:49Y967, 1LM214		S/N:2AF200, 8DF187, BRC147
3512 Marine	50Y1742, 66Z900	3RS340	S/N:4TN379, 8EM353, 2EZ232, 1PW362, 2GW278
3512 Generator Set	24Z9874, 67Z1914	3MS233	S/N:8RM602, 6WN711, 5AW117, 4AW430
3512 Vehicular	51Y843
3512 Locomotive		2WK84	3ZW206
3512 Military			4DR2
3512 Captive Generator Set	S/N:1KZ308	S/N:	S/N:1GZ376
3516 Industrial	S/N:27Z813, 71Z362	S/N:	S/N:9WF118
3516 Marine	S/N:29Z1362, 72Z559	S/N:3SS324, 3XS408	S/N:8KN416, 8CN181, 9AN201, 4BW362, 2FW207, 3CW243
3516 Generator Set	S/N:25Z6946, 73Z947, 5SJ7733	S/N:7KM75, 3NS246	S/N:7RN1641, 6HN1341, 2JW294, 1NW134
3516 Vehicular	S/N:28Z653	S/N:	S/N:
3516 Locomotive	S/N:9KF114	S/N:	S/N:BCK231
3516 Military	S/N:	S/N:3JS9, 2TS8	S/N:
3516 Captive Genertor Set	S/N:1LZ227	S/N:	S/N:1HZ290

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Table 2
Reference For Basic Cylinder Head Groups
Model	Part Number For Basic Cylinder Head Group	Part Number For Remanufactured Cylinder Head	Part Number For Upgrade To New Cylinder Head
3500B	145-3216	0R-9472	0R-9473
3500 MUI	172-0835	0R-9775	0R-9773
3500 EUI	172-0837	0R-9777	0R-9778