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约翰迪尔John Deere柴油发动机气门座圈安装阀座嵌件与拆卸研磨方法

2022/8/24 16:16:00

约翰迪尔John Deere柴油发动机气门座圈安装阀座嵌件与拆卸研磨方法

重要事项:约翰迪尔John Deere柴油发动机阀座研磨只能由熟悉设备并能够保持所需规格的经验丰富的人员进行。

研磨阀座时,始终保持工作区域清洁。必须使用120号砂石打磨进气门和排气门座圈(A)。

使用JT05893重型阀座研磨机套件,研磨阀座,以在气缸盖中获得正确的气门凹槽。参见测量阀凹槽序列

本组中较早的数字。研磨阀座前,确保气门导管孔清洁。参见清洁气门导管系列

如果阀座需要研磨,则只需几秒钟即可修复平均阀座。避免过度研磨的倾向。不要对磨石施加过大压力。

1.用发蓝检查阀座宽度(C)和阀座与阀门之间的接触模式。座椅宽度必须保持在规范范围内。使用游标卡尺或标尺测量座椅宽度。研磨后彻底清洁阀座区域,必要时更换阀门和阀座嵌件。

注:阀座宽度可使用变窄石减小。这将改变阀座顶部的角度(B),并增加直径。如果阀座宽度太窄,阀门可能会烧坏或腐蚀。

改变宽度会改变阀面和阀座之间的精细接触。

2.研磨后,务必使用D11010KW偏心仪测量阀座跳动,并在研磨后检查气缸盖中的凹槽,如后所述。

研磨阀座

测量阀座

A-阀座插入件B-阀座角度C-阀座宽度D-阀座跳动

规格

阀座研磨角…….30  0.50

排宽度…2.0-3.8毫米(0.079-0.150英寸

进气宽度……1.4-3.8毫米(0.055-0.150英寸)

最大阀座跳动量……0.051 mm0.0020 in.

拆下气门座圈并测量气缸盖序列号(200000-)中的孔

在某些情况下,气缸盖中的阀座孔可能损坏或尺寸过大,需要进行加工。在这种情况下,超大尺寸的镶件可用于

0.25毫米(0.010英寸)超大尺寸。

规格

尺寸过大的镶块宽度……0.25毫米(0.010英寸)

重要事项:小心不要损坏气缸盖拆卸气门座圈

拆卸座椅时。

1.使用JDE41296阀座拉拔器(A)拆下阀座插件(如有必要)。拆卸镶块时,可能需要重新拧紧拉拔器上的调整螺钉。

也可以使用以下方法拆除阀座嵌件:

•小心加热表面周围四个点的镶块,直到镶块变红。让阀座冷却,然后用螺丝刀小心地撬出嵌件。

加热阀座插件

2.拆卸嵌件后,彻底清洁A阀座拉拔器周围的区域

阀座孔,并检查是否有损坏或裂纹。


安装序列号为(
200000-)的阀座嵌件

1.使用JDE7驱动器(A)和JDG605阀座安装器(B)将插入件驱动到位。JDG605安装器的大端用于安装进气门,小端用于安装排气门。

2.安装新的或翻新的阀门和止回阀凹槽。参见本组前面的测量阀凹槽序列号(200000-)。

3.根据需要研磨阀座,以保持正确的阀座凹槽和阀座密封。参见本组前面的研磨阀座序列号(200000-)。

A驱动器

B-阀座安装器

安装阀座嵌件


Grind Valve Seats Serial Number (200,000— )

IMPORTANT:  Valve seat grinding should only be done by experienced personnel familiar with equipment and capable of maintaining required specifications.

ALWAYS keep work area clean when grinding valve seats. A 120-grit stone MUST BE used for grinding both intake and exhaust valve seat inserts (A).

Using JT05893 Heavy-Duty Seat Grinder Set, grind valve seats to obtain correct valve recess in cylinder head. See MEASURE VALVE RECESS SERIAL

NUMBER (200,000— ) earlier in this group. Be sure valve guide bores are clean before grinding valve seats. See CLEAN VALVE GUIDES SERIAL

NUMBER (200,000— ) earlier in this group.)

If valve seats need grinding, only a few seconds are required to recondition the average valve seat. Avoid the tendency to grind off too much. Do not use excessive pressure on the grinding stone.

1.      Check the seat width (C) and contact pattern between the seat and valve with bluing. Seat width MUST BE maintained within specification. Use a vernier caliper or scale to measure seat width. Thoroughly clean seat area after grinding and replace valves and valve seat inserts as necessary.

NOTE: Valve seat width can be reduced with a narrowing stone. This will change the angle (B) at the top of the seat and increase the diameter. If valve seat width is too narrow, valve may burn or  erode.

Varying the width changes the fine contact between valve face and seat.

2.      ALWAYS measure valve seat runout after grinding using D11010KW Eccentrimeter and check recess in cylinder head after grinding as described later.

Grinding Valve Seats

Measuring Valve Seats

A—Valve Seat Insert B—Valve Seat Angle C—Valve Seat Width D—Valve Seat Runout

Specification

Valve Seat Grinding—Angle ........  30  0.50

Exhaust Width....  2.0—3.8 mm (0.079—0.150 in.)

Intake Width .....  1.4—3.8 mm (0.055—0.150 in.)

Maximum Seat Runout......  0.051 mm (0.0020 in.)

Remove Valve Seat Inserts and Measure Bores in Cylinder Head Serial Number (200,000— )

In some cases the valve seat bore in the cylinder head may become damaged or oversized and will require machining. In this case, oversize inserts are available  in

0.25 mm (0.010 in.) oversize only.

Specification

Oversize Inserts—Width.....  0.25 mm (0.010 in.)

IMPORTANT:  Be careful not to damage cylinder head         Removing Valve Seat Inserts

when removing seats.

1.      Remove valve seat insert (if necessary) with JDE41296 Valve Seat Puller (A). Adjusting screw on puller may need to be retightened during removal of inserts.

Valve seat inserts may be also removed using the following method:

      Carefully heat insert at four points around face until insert becomes red hot. Allow seat to cool and carefully pry out the insert(s) with a screwdriver.

Heating Valve Seat Inserts

2.      After removal of inserts, thoroughly clean area around          A—Valve Seat Puller

valve seat bore and inspect for damage or  cracks.

Install Valve Seat Inserts Serial Number (200,000— )

1.      Use the JDE7 Driver (A) along with JDG605 Valve Seat Installer (B) to drive inserts into place. The larger end of JDG605 Installer is used to install intake valves and the smaller end is used to install exhaust  valves.

2.      Install new or refaced valves and check valve recess. See MEASURE VALVE RECESS SERIAL NUMBER (200,000— ) earlier in this group.

3.      Grind valve seats as required to maintain correct valve recess and valve-to-seat seal. See GRIND VALVE SEATS SERIAL NUMBER (200,000— ) earlier in this group.

A—Driver

B—Valve Seat Installer

 Installing Valve Seat Inserts

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