活塞冷却喷头故障可能导致活塞、活塞销、连杆销衬套损坏或无油压的故障吗约翰迪尔柴油机
如果完成4.的检查和“热箱”清洁,则拆下约翰迪尔柴油机正时齿轮系和凸轮轴。(需要气缸组缸体,请参阅相应的050。)
拆除所有外部和内部安装的组
下列部件:5.拆下约翰迪尔柴油机喷油泵和燃油滤清器总成。(090组)
1.拆下约翰迪尔柴油机曲轴和皮带轮(如果以前没有)远离的。(第040组)6.如有必要“加热油箱”缸体,拆下机油通道塞、冷却液通道塞、活塞冷却
2.拆下所有剩余的润滑系统节流孔和约翰迪尔柴油机序列号标牌。组件。(第060组)
3.拆下冷却液泵和所有其余冷却系统部件(组070)
拆下并清洁活塞冷却孔
1.拆下所有六个(如图所示)约翰迪尔柴油机活塞冷却孔(A),并检查每个冷却孔,确保其未堵塞或损坏。
2.使用软电线和压缩空气清洁孔口。如果条件有问题,请更换。
重要事项:约翰迪尔柴油机活塞冷却孔故障可能导致活塞、活塞销、连杆销衬套和衬套损坏。如果省略活塞冷却孔,将导致油压低或无油压。
检查和清洁缸体
注意:必须从约翰迪尔柴油机缸体上拆下所有部件(包括活塞冷却孔)、冷却液通道塞和机油通道塞,以便检查和清洁。有关所有外部和内部安装部件的拆卸,请参阅相应的组。
1.使用D17015BR O形圈孔清洁刷或等效刷子彻底清洁缸套O形圈内的所有碎屑。
2.拆下约翰迪尔柴油机气缸盖定位销(如果之前未拆下)。清洁缸体顶部甲板上缸盖安装带帽螺钉的所有螺纹孔。使用JDG681丝锥或等效的9/16-12 UNC-2A丝锥约88.9毫米(3.5英寸)
长的使用压缩空气清除带帽螺钉孔中可能存在的任何碎屑或液体。
重要事项:如果缸体在高温罐中清洁,请务必拆下所有铝制零件。热罐解决方案可能会损坏或破坏铝部件。
拆下所有序列号标牌。
3.使用清洁溶剂、压力蒸汽或热罐彻底清洁砌块。
4.检查衬里支撑法兰(C)是否有毛刺。如果存在毛刺,使用小半月形锉刀并轻轻锉掉(以圆周运动)大约60 角锉削时,不要让锉刀碰到缸体(B)的顶面。
注意:不要过度锉衬板支撑法兰。
过多的锉削会损坏衬套支撑法兰,并导致衬套安装不当。彻底清洁缸体上的所有锉屑。
5.测量约翰迪尔柴油机缸体中的衬套法兰沉孔深度(A),并与下面给出的规范进行比较。
测量缸体中的缸套法兰沉孔深度
A-约翰迪尔柴油机缸套法兰沉孔深度B-气缸体顶部甲板C-缸套支撑法兰
规格
气缸体法兰沉孔深度……11.913-11.963 mm(0.469-0.471英寸)
仔细检查砌块是否有裂缝或任何其他物理损坏。如果怀疑缸体有裂纹,则对缸体进行压力测试。FOS(服务基础)手册约翰迪尔柴油机中概述了压力测试程序。如果有裂纹或物理损坏的迹象,则更换挡块。
Complete Disassembly of Cylinder Block (If Required)
If complete inspection and “Hot Tank” cleaning of 4. Remove timing gear train and camshaft. (Group cylinder block is required, refer to the appropriate 050.)
group for removal of all external and internal mounted
components listed below: 5. Remove fuel injection pump and fuel filter assembly. (Group 090.)
1. Remove crankshaft and pulley if not previously
removed. (Group 040.) 6. If necessary to “Hot Tank” the block, remove oil gallery plugs, coolant gallery plugs, piston cooling
2. Remove all remaining lubrication system orifices and the engine serial number plate. components. (Group 060.)
3. Remove coolant pump and all remaining cooling system components (Group 070.)
Remove and Clean Piston Cooling Orifices
1. Remove all six (four shown) piston cooling orifices (A) and inspect each cooling orifice to make sure it is not plugged or damaged.
2. Use a soft wire and compressed air to clean orifice. Replace if condition is questionable.
IMPORTANT: A piston cooling orifice failure could cause damage to pistons, piston pins, rod pin bushings, and liners. If a piston cooling orifice is left out, low or no oil pressure will result.
Inspect and Clean Cylinder Block
NOTE: All components (including piston cooling orifices), coolant gallery plugs and oil gallery plugs must be removed from the cylinder block for inspection and cleaning. Refer to the proper group for removal of all external and internal mounted components.
1. Use D17015BR O-ring Bore Cleaning Brush or an equivalent brush to thoroughly clean all debris from cylinder liner O-ring bores.
2. Remove cylinder head locating dowels, if not previously removed. Clean out all threaded holes for cylinder head mounting cap screws in top deck of cylinder block. Use JDG681 Tap or an equivalent 9/16-12 UNC-2A tap approximately 88.9 mm (3.5 in.)
long. Use compressed air to remove any debris or fluid which may be present in the cap screw hole.
IMPORTANT: If cylinder block is cleaned in a hot tank, be sure to remove any aluminum parts. Aluminum parts can be damaged or destroyed by hot tank solutions.
Remove all serial number plates.
3. Clean block thoroughly using cleaning solvent, pressure steam, or a hot tank.
4. Inspect liner support flange (C) for burrs. If burrs are present, use a small half-moon file and LIGHTLY file (in a circular motion) burr off at approximately a 60 angle. DO NOT let file hit top deck of cylinder block (B) while filing.
NOTE: DO NOT file liner support flange excessively.
Excess filing can damage liner support flange and allow an improper liner fit. Thoroughly clean all filings from cylinder block.
5. Measure liner flange counterbore depth (A) in block and compare with specification given below.
Measuring Liner Flange Counterbore Depth in Block
A—Liner Flange Counterbore Depth B—Top Deck Of Cylinder Block C—Liner Support Flange
Specification
Cylinder Block Flange
Counterbore—Depth....... 11.913—11.963 mm
(0.469—0.471 in.)
Carefully inspect block for cracks or any other physical damage. If a cracked block is suspected, pressure-test the block. A procedure for pressure testing is outlined in FOS (Fundamentals of Service) Manual-ENGINES. Replace block if there is evidence of a crack or physical damage.
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