(2) Align the protrusion of lower main bearing with the recess on the main bearing cap, and push in the 5 lower main
bearings (Fig. 59). Don’t smear oil onto the main bearing seat and the main bearing half backside.
5. Mount the upper thrust washer
Mount 2 thrust washer at both sides of No.3 main bearing of cylinder block, with the oil groove outwards. Don’t mount
oppositely or drop them (Fig. 60).
6. Put the crankshaft upon the cylinder block
Smear the engine oil onto the operating surface of main bearing shell and thrust washer. Smear the engine oil onto the
main journal of crankshaft, and insert the crankshaft into the bearing hole of cylinder block gently.
7. Mount the main bearing cap and the lower thrust washers
(1) Mount the 2 thrust washers onto the No.3 main bearing cap, with the oil duct outwards (Fig. 61).
Mount the 5 bearing cap onto proper locations, with the arrow marks forwards. Assemble them according to the shown
arrows and sequences (Fig. 62).
(2) Mount and screw on the 10 main bearing cap bolts (with a thin layer of engine oil applied on the bolt screw) according
to the shown sequence (Fig. 63) by multiple and equal actions, the MR479Q/MR479QA torque is 60N.m, the MR481QA
torque is 70N.m, the JL481Q torque is 80N.m.
8. Check the axial clearance of crankshaft
The crankshaft shall be able to rotate freely. Check and measure the axle clearance with the plastic oil clearance gauge
(Fig. 64)
Fig.61 Mount the Thrust Washers onto the Main Bearing Cap
Fig.62 Location to Install the Main Bearing Cap
Front end of engine
Fig. 59 How to Mount the Main Bearing onto
the Main Bearing Cap
Fig. 60 How to Mount the Thrust Washer onto
the Cylinder Block
41
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 ...