Mechanical Diagnosis
150
Clogged air cleaner Clean air cleaner
Damaged valve seals Replace seals on valve stem
Worn valve stem or valve guides Replace valves and valve guides
Broken piston rings or cylinder bore
worn or scored
Have engine repaired. Replace
broken piston rings
Crankcase breather clogged Clean crankcase breather
Blue Smoke (oil consumption) Excessive oil consumption See “High oil consumption”. Repair
as necessary
White Smoke (fuel is not burning) Cold engine Allow engine to warm up
Low compression Check and eliminate possible
causes. Repair as necessary
Timing Readjust timing
Air or water in fuel Bleed system. Replace filters, clean
fuel system, drain and clean tank
and check supply tank for water.
Use known good fuel
Insufficient preheat Check glow plugs
Battery is not recharging Loose alternator belt Tighten belt
Loose connections in electrical
system
Check all electrical connections and
charging system
Worn brushes in alternator Repair
Voltage regulator faulty Replace
Battery defective Replace
Alternator defective Repair or replace
Condition Possible Cause Remedy
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