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14.7) Hydraulic valve tappets
See Pic. 264, 265 and 266.
Remove valve tappet Q from crankcase using a specially shaped screwdriver W.
Never engage at circlip E. This could cause valve tappet to fall apart.
ATTENTION: Lay aside tappets in a
Check valve tappet visually. The tappet
rotates during operation. Therefore the cam
contact surface R is worn evenly. If the
tappet does not rotate, the contact face will
be worn unevenly. In case of uneven wear
4
replace the tappet. The tappets are not allowed
5
Pic. 265
3
6
Pic. 266
14.8) Push rods
See Pic. 267.
Clean push rods Q and inspect them visually. Pay attention to tight fit of the two ball
heads W pressed into the rod. Excessive engine speed may have caused bending
of the push rods. Check push rods for straightness. Through the bores E oil passes
from the valve tappet to the rocker arm.
2
00302
Modification no.
- 0 -
manner to ensure refitting
in their initial place.
to be ground on their face!
If a valve tappet must be re-
placed, check carefully the
respective cam on camshaft.
Taking apart valve tappets is
00300
not planned and not neces-
sary.
The new valve tappet is supplied dry and will fill itself full with oil
during starting procedure. Oil enters the valve tappet through bore
T. The securing ring E keeps the valve tappet plunger Y in
position when the tappet is removed.
ATTENTION: The first cranking of a repaired engine should be
00301
without ignition, until the required oil pressure is built up.
Q
Reference
Pic. 267
Pic. 264
3
1
2
00299
3
2
Main
Date
1997 02 01
914 F
Page
255
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Table of Contents
Troubleshooting
