Operation and Maintenance Manual SC9DF Electronically Controlled Diesel Engine for Agricultural Equipment
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4.5.1 Check concentrations of anti-freeze fluid and coolant
additive
Use ice point apparatus to check anti-freeze content of
ant-freeze coolant.
It is necessary to use anti-freeze coolant under any climatic
condition, for it can increase boiling point of the coolant and
meanwhile decrease condensation point, so that the operation
temperature range of the engine coolant is extended.
The anti-freeze content shall be controlled to make the coolant ice point lower than local min. temperature by about
10℃, Refer to Section 2.3.3 for relationship between the volume ratio of ethylene glycol and water and ice point.
If being applied, the content of DCA4 additive shall be checked as per Section 2.3.3.
4.5.2 Adjust valve clearance
Remove cylinder head cover and components above it, before
adjusting the valve clearance.
Insert the barring tool into the flywheel housing barring hole and
make it engage with flywheel gear ring. Rotate the crankshaft
slowly to let the point indicator on the flywheel housing points at
“0” mark in the flywheel and check if the intake and exhaust valves
are closed by rotating their push rods. If the both rods rotate freely, the No.1 cylinder piston is at the top center
compression position of cylinder 1; if not, rotate the crankshaft by 360 to let the No.1 cylinder piston is at the top dead
center on compression stroke.
Check and adjust valve clearance with a feeler gauge.
Intake valve clearance: 0.30 mm;
Exhaust valve clearance: 0.50 mm.
Valve clearance check must be conducted after the engine has
cooled down to below 60C.
△Caution: The clearance is correct when some resistance is
felt when the feeler gauge is slipped between the rocker arm
and the valve bridge.
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