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1、4102BZLQ Engine attention points,Dongfeng Chaoyang Diesel Co.,Ltd(2008),4102BZLQ Engine Application,Applied to JAC HFC1048,1061 Medium buses HFK 6603,6730,4102BZLQ Engine Application,4102BZLQ Engine Application,Important tightening torque when you assemble engines,Main bearing cap bolt tightening to
2、rque216-235N.m(22-24kgf.m)160-174 lbf.ft,Cylinder head bolt tightening torque,118-127N.m(12-13kgf.m)87-94 lbf.ft,Cylinder head bolt tightening sequence,Connecting rod tightening torque,118-127N.m(12-13kgf.m)87-94 lbf.ft,Crankshaft front nut,Tightening torque 392-441N.m(40-45kgf.m)290-326 lbf.ft,Fly
3、wheel,Tightening torque 196-216N.m(20-22kgf.m)145-160 lbf.ft,Fly wheel,Flywheel housing,Tightening torque 127-147N.m(13-15kgf.m)94-109 lbf.ft,Flywheel housing,Camshaft gear press plate bolt,Tightening torque 108-118N.m(11-12kgf.m)80-87lbf.ft,Camshaft gear press plate bolt,Valve clearance adjustment
4、procedure,Intake and exhaust valve clearance 0.4mm(cold state)Compression clearance（TDC，distance between piston top and the bottom surface of cylinder head)0.9-1.1mm,Valve clearance adjustment procedure,Intake and exhaust valve clearance 0.4mm(cold state)According engine running direction rotate cra
5、nkshaft,make alignment of TDC mark on damper pulley and timing pointer on gear chamber cover,at this moment,use hand shake No.1 cylinder intake and exhaust valve rocker arm,if both have clearance,that means No.1 cylinder is at TDC,then you can adjust the valve clearance of No.1,2,3,6.If these two ro
6、cker arms has no clearance,that means No.4 cylinder is at TDC,then you can adjust valve clearance of No.4,5,7,8.By two times finish the preliminary adjustment,then you have to recheck it one more time for sure.,Valve clearance adjustment procedure,Valve clearance adjustment procedure,Thrust plate in
7、stallation,Thrust plate on No.4 main bearing cap up and down.When installation,the oil groove side should face crankshaft side,Thrust plate installation,Thrust plate located on No.4 main bearing cap up and down,Main bearing installation,No.3 main down bearing has no oil hole and oil groove.Do not mi
8、x upper and down,which will cause oil hole blocked and no lubrication for bearing,Main bearing installation,Cylinder head gasket,Cylinder head gasket normally has 3groups,the thickness is 1.55mm,1.65mm,1.75mm respectively.For maintenance part,DCD provides the middle one,that is 1.65mm.Anytime when y
9、ou change the head gasket,attention please,Turbo engine(T,Ti)head gasket is different from NA.T,Ti cylinder head gasket,edge of cylinder bore is covered with steel sheet and steel wire inside protection,the edges of oil hole and water holes are all covered copper sheet or have special treatment,whic
10、h is of good sealing ability and longer service life.,Cylinder head gasket,Cylinder liner protrusion,Cylinder liner protrusion above the top surface of the cylinder block over the tolerance(normally the protrusion 0.05-0.12mm,adjacent two cylinders tolerance not exceeding 0.03mm)Higher or lower will
11、 both cause cylinder head gasket broken by gas,Protrusion height,Turbocharger,Attention pointsDo not idle running engine more than 10 minutes,which might cause big negative pressure,leading compressor end oil leaking,Turbocharger,Turbocharger,Long time no use engine,(for instance,more than a month,s
12、hipping just arrival at port),when in operation of the engine,you should remove the top oil fitting of turbocharger,fill some fresh oil to turboin case of turbocharger rotor shaft and bearing excessive wear and burnt.,Check fan belt tension,Check fan belt tension with 39N force pressing the belt,the
13、 deflection is 10-15mm.In case of loose,which causing water pump insufficient capacity,and engine will get high water temperature,Check fan belt tension,Oil appilcation,4102BZLQ engine oil Mobil brand/CF-4,15W-40,Injection pump,After engine run-in 5000KM,the nylon cap on the limit speed screw of fue
14、l pump should be removed,in case of insufficient power.,Intake air system,When in operation,check air intake line connections,be sure no loose or short circuit.Anytime,good quality air filter element should be used,the point is cylinder premature will get much more cost than a good air filter elemen
15、t.,Bad quality air filter elementpoor sealing performance,Bad quality air filter elementpoor sealing performance,Connecting rod,Connecting rod disassembly and assembly,the caps should match the body and do not mix them.,Connecting rod,Connecting rod,Some important fit clearance,Main bearing and main
16、 bearing journal fit clearance 0.055-0.106mm,Main bearing and journal fit clearance check,Connecting rod,Connecting rod bearing and connecting rod journal clearance 0.05-0.098mm,Crankshaft axial clearance,Crankshaft axial clearance 0.115-0.256mm,Some important fit clearance,Cylinder liner and piston fit clearance 0.10-0.12mm,Thank you for your attention!,
