3500B Engines and 776D, 777D, 784C, 785C, 789C, 793C and 793D Off-Highway Truck/Tractors Caterpillar

Cylinder Head Valves

Usage:

785C 1HW

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图 1	g02829216

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表 1
技术规格 - 338-8671 缸盖总成、 338-8672 缸盖总成和 317-2440 缸盖总成
项目	数量	零件	技术规格说明
1	4	316-5976 弹簧	测试力下的长度为 60.29 mm (2.374 inch)。测试力为 460 ± 23 N (103 ± 5 lb)。测试后的自由长度为 74.8 mm (2.94 inch)。
2	4	316-5977 弹簧	测试力下的长度为 57.5 mm (2.26 inch)。测试力为 248.0 ± 12.4 N (55.8 ± 2.8 lb)。测试后的自由长度为 71.4 mm (2.81 inch)。
3	2	316-5980 气门杆密封件	将阀杆密封件安装到进气阀上。组装前涂抹发动机机油。
4	2	316-5981 垫圈	将垫圈安装到排气阀上。
A	-	-	从缸盖顶部到气门导管顶部的高度为 26.0 ± 1.0 mm (1.02 ± 0.04 inch)。
5	2	197-6995 气门导管	安装后排气门导管的孔径为 12.619 ± 0.025 mm (0.4968 ± 0.0010 inch)。
6	2	133-9306 气门导管	安装后进气门导管的孔径为 9.487 ± 0.025 mm (0.3735 ± 0.0010 inch)。
7	2	443-2712 排气门	组装前，用清洁的发动机机油涂覆排气阀杆。气门杆直径 (B) 为 12.573 ± 0.01mm (0.4950 0.0004 inch)。气门直径 (D) 为 56.00 ± 0.15 mm (2.205 ± 0.006 inch)。端面角度为 44.40 ± 0.25 度。
8	2	210-2542 进气阀	组装前，用清洁的发动机机油涂覆进气阀杆。气门杆直径 (C) 为 9.441 ± 0.010 mm (0.3717 ± 0.0004 inch)。气门直径 (E) 为 56.00 ± 0.15 mm (2.205 ± 0.006 inch)。端面角度为 19.40 ± 0.25 度。
9	2	130-2608 气门座镶圈	排气门座镶圈的直径为 60.119 ± 0.015 mm (2.3669 ± 0.0006 inch)。缸盖的缸径为 60.000 ± 0.025 mm (2.3622 ± 0.0010 inch)。端面角度为 45.00 ± 0.25 度。
10	2	130-2607 气门座镶圈	进气门座镶圈的直径为 60.627 ± 0.015 mm (2.3869 ± 0.0006 inch)。缸盖的缸径为 60.508 ± 0.025 mm (2.3822 ± 0.0010 inch)。端面角度为 20.00 ± 0.25 度。

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