TRACING ENGi.NE TROUBLE
Apparent lack of pomer (continuously)
Possible causes are mechanical tightness of the tractor or deterioration
of the engine during operation.
Test compression when engine is hot.
Test for ability of tractor to run freely by attempting to push the
tractor along a smooth road with the gear lever in neutral and brakes
disengaged. If tightness is suspected, examine for binding of brakes, under
inflated tyres, or transmission stiffness due to lack of lubrication or use of
incorrect lubricant.
If tractor runs freely and all the above points have been looked over,
check the setting of the engine controls, and for tightness at control joints.
Correct where necessary.
Appa,·ent lack of pomer (aL intervals)
-Fuel Systeni
This may arise from partial obstruction of the fuel system-inspect
and correct as explained in previous section (also see below).
Apparent lacl, of power (at intervals)
-Mechanical
This may result from inadequate lubrication of the engine, causing
partial seizure. Inspect sump level and condition of oil filter at pump.
Top-up and clean as required. A check on the condition of the oil cleaner
element should be made; wash or ·renew.
Engine knocl, (mith overheating)
Due possibly to shortage of water in the cooling system, fan belt slip,
excessive carbon deposit on the piston crowns, etc. ( causing " pinking "),
the use of incorrect lubricating oil or the radiator blind not operating.
Check for blocked radiator and flush if necessary. Adjust fan belt,
·
check lubricant and, if knocking persists, consult a David Brown dealer.
Engine knock (without overheati,ig)
Causes are inadequate lubrication of the engine, use of unsuitable
lubricating oil, bearing slackness at crankshaft main journals and big ends,
or piston slap.
After checking level and quality of lubricant, obtain advice of a David
Brown dealer.
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