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7/120 (P425AWIR), 9/110 (XP375AWIR), 10/105 (HP375AWIR), 14/85 (VHP300AWIR),
7/170 (P600WIR), 10/125 (HP450WIR), 14/115 (VHP400WIR)
Symptom Problem Solution
Engine runs irregularly
or stalls frequently
Low coolant temperature. Remove and check thermostat.
Clogged fuel filter. Replace fuel filter element.
Water, dirt, or air in fuel system. Drain, flush, fill, and bleed system.
Dirty or faulty injection nozzles.
Have authorized servicing dealer
check injectors.
Electronic fuel system problem See your distributor or servicing
dealer.
Below normal Engine
temperature
Defective thermostat. Remove and check thermostat.
Defective temperature gauge or
sender.
Check gauge, sender, and
connections.
Lack of power Engine overloaded. Reduce load.
Intake air restriction. Service air cleaner.
Clogged fuel filter. Replace filter elements.
Improper type of fuel. Use proper fuel.
Overheated engine. See “Engine Overheats”.
Below normal engine temperature. Remove and check thermostat.
Improper valve clearance. See your authorized servicing
dealer.
Dirty or faulty injection nozzles. Have authorized servicing dealer
check injectors.
Injection pump out of time. See your authorized servicing
dealer.
Electronic fuel system problem See your authorized servicing
dealer.
Turbocharger not functioning.
(Turbocharger engines only)
See your authorized servicing
dealer.
Leaking exhaust manifold gasket. See your authorized servicing
dealer.
Defective aneroid control line. See your authorized servicing
dealer.
Restricted fuel hose. Clean or replace fuel hose.
Low fast idle speed. See your authorized servicing
dealer.