Automobile Level04-Hbse-U2-S3-Inspection and Replacement of Cylinder Liner

  

(Inspection and replacement of cylinder liner, bore skeve, connecting rod vkSj engine bearing

Q1.         Cylinder liner dh inspection dSls djksxsaA

Ans.      

(i)            Bore sleeve dh upper side dh tkap djsa ;fn ;g f?kl xbZ gS rks sleeve dks cny nsaA

(ii)           Dial bare gauge dh lgk;rk ls fo'ks"k rkSj ls swept volume ;k travel area dh f?klkoV dh tkap djsaA

(iii)          ;fn piston ring, ring groove esa vVdk gqvk gS rks bore sleev esa scratches notice fd,  tk,axsA

(iv)          Engine overheating ds dkj.k piston, bore sleeve esa size  gks ldrk gSA

 

Q2.         Dry liner/ore sleeve dks cnyus dh fof/k fy[kksA

Ans.

(i)            Engine block dks press ij j[ksaA

(ii)           Cylinder bore ds size ds vuqlkj special tool dk iz;ksx djsaA

(iii)          Engine Block dks properly support djsa vkSj press ij rigidly fix djsaA

(iv)          0.2 ls 0.5 tone dk pressure dry liner ij B.D.C dh rjQ ls yxk,a tgka batu block ds crank case dh rjQ ls sleeve lekIr gksrh gSA

(v)           iqjkuh sleeve batu block ls ckgj vk tk,xhA

(vi)          u, standard size dh bore sleeve, standard piston vkSj rings ds lkFk select djsaA

(vii)         Sleeve dks liquid hydrogen esa j[ksa tgka ls ;g engine block bore esa j[kus ds fy, vklku gks tk,A  

(viii)        Sleeve dks cylinder head side ls engine block ij j[ksaA

(ix)          /khjs&/khjs 0.1 ls 0.3 tone rd sleeve ij izS'kj yxk,a] blls sleeve vklkuh ls engine block esa enter gks tk,xhA

(x)           Machinist edge vkSj feeler gauge dh lgk;rk ls engine block esa sleeve dh height dh tkap djsaA

(xi)          lHkh cylinders ds equal height dks maintain djsaA

(xii)         Bore dks lkQ vkSj lubricate djsaA

(xiii)        Piston dh clearance dks feeler gauge dh lgk;rk ls pSd djsA

(xiv)        Piston ring compressor dk iz;ksx djrs gq, piston dks connecting rod ds lkFk engine block ds lkFk fit djsaA

(xv)         ;gh vki lHkh sleeve ds lkFk nksgjk,aA

 

Q3.         Wet liner / bore sleeve dks cnyus dh fof/k crk,aA

Ans.

(i)            batu block dks press ij j[ksaA

(ii)           Cylinder bore ds size ds vuqlkj special tod dk iz;ksx djsaA

(iii)          batu block dks properly support djsa vkSj press ij rigidly fix djsaA

(iv)          tgka Sleeve B.D.C. ij [kRe gksrh gS ogka batu block dh crankside ij 01. to 0.3 tone ij pressure  yxk,aA

(v)           Engine block ls iqjkuh sleeve ckgj vk tk,xhA

(vi)          u, standard size dh bore sleeve piston vkSj rings ysaA

(vii)         Sleeve ij soap water yxk,a vkSj crankcase esa water dh leakage ls cpus ds fy,  O ring fit djsaA

(viii)        Sleeve dks cylinder block ds head okyh side ij j[ksaA

(ix)          /khjs&/khjs press ij 0.1 ls 0.3 tone dk pressure apply djsaA /;ku j[ksa dh O ring tuist u djsaA Liner dks cylinder block esa /khjs&/khjs ljdk,aA

(x)           Machinist edge vkSj feeler guage dh lgk;rk ls sleeve height dh tkap djsaA

(xi)          Bore dks lkQ vkSj lubricate djsaA

(xii)         Rings dks ring groove esa j[ksa vkSj lubricating oil apply djsa vkSj ring compressor dh lgk;rk ls piston dks connecting rod ds lkFk engine block eas MkysA

 

Q4.        Crank Shaft vkSj main bearing dh tkap (inspection) dSls djksxs \

Ans.      

(i)            Cranshaft dh alignment ds fy, tkap djsaA

(ii)           Main bearing dh tkap djsaA

(iii)          Crank case esa ls crank shaft gVk,aA

(iv)          Lathe machine ij crankshaft dks j[ksaA

(v)           Runout ;k Bend dks ns[kus ds fy, dial gauge dk iz;ksx djsaA

(vi)          Dial gauge dks nksuksa fljksa ij ;k centre esa j[ksaA

(vii)         Crankshaft dks ?kqek,a vkSj ;n 0.6mm ls vf/kd run out ikbZ tkrh gS] rks crankshaft grind djuk t:jh gksxkA

(viii)        Big end journal ;k main journal dk mHkjkiu ;k VsM~kiu tkap djsaA

(ix)          Micrometer dk iz;ksx vkSj  AA’ (Horizontal) vkSj BB’ (Vertaical)

(x)           Ovality (mHkjsiu) dh  permissible value 0.01mm to 0.015mm  gSA

(xi)          Taperness (Vs<+kiu) tkapus ds fy, main journal / connecting journal ds nksukas fljksa ij reading yhft,A

(xii)         Micrometer yhft, vkSj aa’ position vkSj bb’ ij reading yhft,A ;g Vs<+kiu n'kkZrk gSA

(xiii)        Taperness dh permissible value 0.01 mm ls 0.015 gSA

(xiv)        Journal ends ij collar dks check djsaA

(xv)         Oil hole ds fljksa dh tkap djsA vkSj hole dks lkQ djksA

(xvi)        ;fn alignment/ovality/taperness permissible value vf/kd gS rks crankshaft dks 0.15mm rd undersize djsaA

(xvii)       Cranskshaft dks repair ;k undersize djus ds fy, special grinding machine dk iz;ksx fd;k tkrk gSA

(xviii)      Crankshaft dks maximum 0.15mm rd gh undersize djsaA

(xix)        Gap ;k clearance dks lgh djus ds fy, engine bearing cny nsaA

(xx)         Plastic gauge ;k micrometer dk iz;ksx djds oil clearance ;k bearing clearance dh tkap djsaA Permissible value 0.05mm  gSA

(xxi)        Bend gqbZ ;k twist gqbZ connecting rod dks ges'kk cny nsaA

(xxii)       Crankshaft dks crankcase esa fQV djsa vkSj end dh play dh tkap djsaA

(xxiii)      End play dks tkapus ds fy, crankshaft ds ,d fljs ij dial gauge j[ksaA Crankshaft dks pull/push djus ls dial gauge deflection fn[kkrh gSA

(xxiv)      ;fn play dkQh gS rks oversize ds thrust pad yxk,a vkSj ;fn de gS rks thrust pad dk size ?kVk,aA

(xxv)       lHkh oil seals, ‘o’ ring, packing kit vkfn dks cny nsaA

(xxvi)      Engine dks service manual esa crka, vuqlkj mfpr dze esa assemble djsaA

(xxvii)     Engine oil Mkys vkSj lHkh vU; accessories fQV djsaA

(xxviii)    Engine dks idle speed ij 2 ?kaVs ds fy, pyk,a vkSj  leakage dh tkap djsaA

(xix)        nks ?kaVs ckn test drive ysA

 

               Fill in the Blanks :-

(i)           Bend ;k …………………… connecting rod dks ges'kk cny nsaA

(ii)           Crankshaft dks ?kqek,] ;fn run out …………. Ls vf/kd gS rks crankshaft regrind djus dh need gSA

(iii)          Ovality dh permissible value ………… ls ---------------------mm  gSA

(iv)          Taperness dh permissible value ………………………… ls ---------------------mm gSA

Ans.       (i) Twisted

               (ii) 0.06 mm

               (iii) 0.01 mm, 0.015 mm

               (iv) 0.01 mm , 0.015 mm