Dnepr MT9 - Push Rods; Tappets; Valve Rocker with Pin

On co mpl e ting the in spection, taking m eas urem e nts and pcr!orm-
ing the re quir ed repair s, re-in s tall th e va lv es .
The
\·alves are re -installed in r eve r se orde r, the va l ve stems
bei
ng lubri cated wit h grap hite grease.
Valve Rocker with Pin
To rcmo\·c lhe rocke rs, un sc r ew the nul and tak e the r ocke r pi n
Dut of the
brackets of th e cylin der h ea d. In doing thi s, mark th e
rockers t ogether wit h their bush in gs so that th ey can be co rr ectly
in stal led in their orig inal pl aces .
After remova l of th e va l\ -e rocker s, was h the co mpon en t p ar ts,
examine th em an d mak e the n ecessary m eas ur eme nt s.
Make s ur e there are no cracks, dents, sco r es on the pin, in the
rocker opening a nd in the cylin der h ead br ac k ets ; a lso, check t he
rock er bushin gs <~nd th e in le rn< il open i ngs of the rockers th em selves
for wear.
If th e bus hin gs or open in gs in th e r ocke rs are wo rn to the extent
of more than 0.07 111111, rep l ace the co mpon ent part s. ·
Re-instal l the rocke rs on the he ad in the following order :
ins
tall th e l ower thru st w as her, rocker and upper thru st was her
in the brackets of th e cy linder h ead;
lubricate the r ocker pin with en gin e oil an d s li ghtly pr ess th e
pin into th e cy lind er head brack ets;
fit th e sp ring washer a nd spec ial was her on the bolt a nd screw
the bolt in to the ope nin g of th e rocker pin.
If the adj u st ing h olt ha s been scr ewed out of the r ocker, inse rt it
bac k in pla ce <llld screw it in as f(lr as it will go, then sc rew on th e
check nut.
Push Rods
Exami ne the remov ed pu sh rod s, chec k th e rod e nd pieces for
we ar or dllmage, (l l so check the rods for bei ng rectilin ear.
If foun d not rect ilin ea r, s tr<~ight en t he r ods on a ch eck faceplate
by lap ping a bar wit h a hamm er t hr oug h a so ft meta l mandr e l.
Wh en chec king on th e plale, a 0.2 mm feel er g au ge mu st not pa ss
bet wee n the rod and pl ate.
The l ola ] le ngth of the rod must be 256 .= ri~ mm .
Tappets
Wash and tho r oughly exam ine the ta ppets th at ha ve been re-
moved during eng ine di sass embl y.
Th e tap p ets h av ing worn-ou t or pitted surf aces or scores on th e
e
nd f aces contacti ng t he camshaft cams, must be replaced by n ew
ones.
Th e t appets that arc worn at the int e rn al sphe rical s urf ace con-
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