Mahindra 35 Series, Service Manual

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C-29 35 Series 4WD, Model - 3535, 4035, 4535 and 5035 SM June’08
Fig. 14
Replacing the valve seat
Fig. 15
The Guide Stud
SEAT GRINDING STONE 15 0 SMALLER THAN
ANGLE OF VALVE SEAT NARROWS SEAT
VALVE FACE NOW CONTACTS THE SEAT
i) Assemble the valve rocker arm assemblies as
detailed. Loosen the lock nuts on each valve lever
and back of the adjusting screw.
j) Install the valve rocker arm assembly as detailed.
Replace the longer cap screw through the center
bracket and retorque to the correct figure.
k) Install the thermostat housing.
l) Install the thermostat bypass hose.
m) Reassemble the fuel injection pipes.
n) Refit the intake and exhaust manifolds.
o) Adjust the tappet clearance after the cylinder head
is tightened to the correct torque for adjustments.
Tips for service of cylinder head
1) During cylinder head overhaul, Nozzle protrusion
(protrusion of nozzle tip from head bottom face)
should be checked thoroughly as it affects the
fuel spray pattern of the nozzle.
2) Excessive carbon deposition on valve neck and
valve stem indicates engine oil consumption due
to excessive clearance between stem and valve
guide.
3) Discard valve springs if they have lost tension or
are broken.
4) Always replace valve collects whenever valves are
opened for inspection or repairs.
5) Improper valve spring tension, valve lapping,
tappet setting, timing or excessive cam lobe wear
will cause valve seat damage and subsequent
leakage.
6) While replacing piston rings ensure that the valve
seats are ground/lapped for perfect seating to
avoid oil throw from the exhaust.
7) While regrinding the valve maintain it’s
concentricity with the guide to ensure proper
seating.
8) Never remove the cylinder head in hot condition.
Manifolds, Cylinder Head & Valves