POTENTIAL CAUSE 1. Low quality fuel. 2. Injection pump/engine timing is retarded. 3. Engine coolant entering combustion chamber through blown gasket, cracked head, loose/damaged head…

POTENTIAL CAUSE 1. CDR valve faulty. 2. Worn piston rings, valve stem seals, or valve guides. CORRECTION 1. Check valve operation with manometer or vacuum…

POTENTIAL CAUSE 1. Vehicle overloaded. 2. Low grade diesel fuel. 3. Sludge or wax buildup in fuel filter (low fuel supply). 4. Air in fuel…

POTENTIAL CAUSE 1. Air leaks in fuel lines. 2. Fuel filter partially plugged by wax formation, dirt/sludge, or partially water filled. 3. Misfueled, wrong fuel,…

POTENTIAL CAUSE 1. Shift lever not entirely in Park (or Neutral position). 2. Insufficient battery voltage due to: – Low charge – Corroded connections –…

POTENTIAL CAUSE 1. Incorrect grade of diesel fuel. 2. Water in fuel or wax buildup in filter. 3. Glow plugs inoperative. 4. Fuel lift pump…

POTENTIAL CAUSE 1. Wrong fuel or poor quality fuel. 2. Air leaks in fuel supply (suction) lines. 3. Fuel return or vent line restricted. 4.…

POTENTIAL CAUSE 1. Insufficient cranking speed (below 100 rpm cold or 180 rpm hot). Caused by: – Low batteries – Bad cable connections – Serpentine…

The diagnosis charts describe common faults that may occur. Potential causes are listed in order of probability. Although the charts list frequent causes for specific…

Connect the pressure test gauge to the transmitter fitting in the valley of the block. Pressure should be a minimum of 6 psi (41 kPa)…