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6. Check and grind valve 89º sealed cone
(1) Grind valve to eliminate pockmark and carbon deposit. Apply a thin layer of valve abrasive paste on the valve seat,
then use a handle with a rubber sucker on one end to suck the valve plane tightly. Grasp handle to move upwards and
downwards manually and turn the valve, grinding and
tapping seat surface. Turn valve slowly while tapping
(2) seat surface repeatedly to make continuous thin
belt.Check and grind valve to correct valve cone angle
(Fig.84),valve cone angle: 45.5 º±15’.
(3) Check edge thickness of valve head (Fig. 85), standard
edge thickness is 0.8-1.2mm. Allowable min. edge
thickness is 0.5mm. If edge thickness is less than the
minimum value, replace the valve.
(4) Check full length of valve (Fig. 86)
Maximum full length:
Intake: 87.60mm
Exhaust: 87.95mm
Minimum full length:
Intake: 86.40mm
Exhaust: 87.65mm.
If full length is less than the minimum value, replace the
valve length.
(5) Check abrasion on the end surface of valve stem and
trim it. If the end of valve stem is abraded, use abrasive
wheel to grind and trim the end or replace valve. Be noted
not to exceed minimum valve (Fig. 87).
7. Check valve seat
(1) Use 45ºcarbide ceramic reamer to ream valve seat, cut away some metal to clean up the valve seat (Fig. 88).
(2) Check valve seating
Firstly apply a layer of red lead oil on the contact surface of valve. Do not turn the valve when installing it. Let it fall down
Fig. 86 Check full length of valve
Fig.87 Grind valve end
Edge thickness
Full length
Fig. 84 Grind valve
Fig. 85 Check thickness of valve edge
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Содержание JL481Q
Страница 1: ......
Страница 9: ...5 Fig 3 Components Assembly Drawing of MR479Q MR479QA Engine ...
Страница 10: ...6 Fig 4 MR479Q MR479QA Engine and Its Power System ...
Страница 11: ...7 Fig 5 Assembly Drawing of Engine and Its Auxiliaries MR479Q MR479QA ...
Страница 12: ...8 Fig 6 Electronic Control Fuel Injection System in Engine MR479Q MR479QA ...
Страница 13: ...9 Fig 7 Front view of Engine JL481Q MR481QA ...
Страница 14: ...10 Fig 8 Sectional elevation of Engine JL481Q MR481QA ...
Страница 15: ...11 Fig 9 Electronic Control Fuel Injection System in Engine JL481Q MR481QA ...
Страница 21: ...17 Fig 13 Exterior Feature of JL481Q Engine Power Me N m Torque Pe Kw ge g kwh Fuel Consumption Ratio ...