SECTION IV – ASSEMBLY 3-锥形密封件-航修札记

3.Conical Seal

锥形密封件

NOTE: Conical seals are used at specific locations during engine production to preclude leakage. However, conical seals may be used at any flared tubing fitting of appropriate size in fuel and oil systems as a repair to correct leakage at the option of the user.

注：锥形密封件在发动机生产特定工序中用于防止泄漏。但可选择将其用于燃油及滑油系统中任何尺寸匹配的扩口管接头，作为修复泄漏的解决方案。

A.Conical Seal Selection and Lubrication

锥形密封件选型与润滑

CAUTION: INPROPER INSTALLATION OF CONICAL SEALS DESCRIBED IN THE FOLLOWING STEPS IS ESSENTIAL TO AVOID FLOW RESTRICTION OR SUBSEQUENT LEAKAGE. CONICAL SEALS ARE TO BE USED ONLY ONCE AND SHALL BE REPLACED AT EACH DISASSEMBLY OF PLUMBING. ENSURE THAT PREVIOUSLY INSTALLED CONICAL SEAL IS REMOVED FROM PLUMBING FITTING BEFORE INSTALLING NEW CONICAL SEAL.

警告：必须严格遵循以下步骤安装锥形密封件，否则将导致流量受限或后续泄漏。锥形密封件仅限一次性使用，每次拆卸管路时均须更换。安装新锥形密封件前，务必从管道接头中清除旧密封件。

Unless otherwise specified, flared tubing fittings when used with conical seals shall be tightened to torque values specified in Table 502. When conical seals are used, install conical seals and tighten fittings as described in the following steps.

除非另有说明，带锥形密封件的喇叭口管接头应按表502规定的扭矩值拧紧。使用锥形密封件时，请按以下步骤安装密封件并拧紧接头。

(1) Select proper conical seal part number for tube assembly being installed. (Refer to Table 502.)

根据待安装管路组件选择对应锥形密封件零件号（参见表502）。

(2) Lubricate conical seal and threads of plumbing fitting with clean engine oil.

用干净的机油润滑锥形密封件及管件螺纹。

B.Conical Seal Installation

锥形密封件安装

CAUTION: DO NOT INSTALL CONICAL SEAL INTO TUBE NUTS. SEAL SHALL BE INSTALLED ON MALE FITTING ONLY.

注意：严禁将锥形密封件安装于管螺母。密封件仅可安装于外螺纹接头。

(1) Install conical seal onto male flare portion of plumbing fitting. Flats on conical seal are designed to provide proper positioning of seal onto plumbing fitting to prevent cocking of seal that could cause flow restriction.

将锥形密封件安装于管件的外螺纹喇叭口部位。密封件的平面设计用于确保其在管件上的正确定位，防止密封件倾斜（翘起）导致流量受限。

(2) Thread tube nut onto plumbing fitting several turns with fingers until joint is snug. If tube nut cannot be tightened snugly with fingers, disassemble and correct problem to prevent assembly damage to conical seal.

用手指将管螺母旋入管件数圈直至接头紧固。若无法用手拧紧管螺母，请拆卸并排除故障，以免组装过程损坏锥形密封件。

CAUTION: DO NOT INSTALL CONICAL SEAL INTO TUBE NUTS. INSTALL SEAL ON MALE FITTING ONLY.

注意：锥形密封件严禁安装于管螺母，仅可安装在外螺纹接头。

(3) Tighten tube nuts as follows:

按以下步骤拧紧管螺母：

NOTE: Conical seals are subject to cold creep; therefore, a double tightening procedures is required.

注：锥形密封件易受冷蠕变影响，故需执行双重紧固程序。

(a) Tighten tube nuts to torque value specified in Table 502. Torque values are higher than torque values for tube nuts without conical seals installed.

按表502规定的扭矩值拧紧管螺母。带锥形密封件的管螺母扭矩值高于未安装密封件的管螺母。

(b) Allow five minutes elapsed time for cold creep to occur.

静置五分钟以发生冷蠕变。

重新检查管螺母扭矩值，必要时按表502规定值再次拧紧。