Fault Finding

Instruction Book for Bolinder Single & Twin-cylinder Engines

Fault Finding

In the following we have listed some of the most commonly occurring troubles and how they are
remedied. Do not, however, try faults that should be repaired by an authorized workshop. Such
faults require special tools and specially trained personnel.

Never forget the necessity of absolute cleanliness in all work on the engine and, in particular, on
the injection equipment.

Engine Fails To Start - Engine Starts But Tends To Stop - Poor Engine Output - Diesel Knock

Smokey Exhaust - Engine Runs Erratically - Engine Fails To Reach Top r.p.m. - Engine Races

Oil Pressure Gauge Shows
Insufficient Pressure

Symptoms	Possible Cause	Remedy

Engine fails to start	Fuel tank empty	Fill with fuel and bleed
	Broken spring ( fig.11 ) at injection pump	Replace spring

	Air in injection pump	Bleed system

	Stop control in stop position	Chang to running position

	Leakage in a fuel line	Check pipe lines
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	Condensation water frozen in fuel tank, clogging suction pipe	Thaw out tank and drain off sediment ( water and fuel )

	Faulty feed pump	Repair by authorized workshop

	Battery discharged	Charge or replace battery

Engine starts but tends to stop	Clogged air holes in fuel tank	Clean out holes

	Clogged fine-filter	Repair by authorized workshop

	Clogged overflow valve on fine-filter	Disassemble overflow valve and check for proper sealing
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	Water in fuel	Drain water and fuel from sludge pocket of fuel tank

	Sticking intake or exhaust valves	Loosen valves

	Broken valve spring	Replace broken spring

Poor engine output	Leaking pressure pipe	Tighten pipes

	Faulty injectors	Replace with spare, Repair faulty injector at authorized workshop

	Clogged air cleaner	Clean air cleaner

	Faulty injector pump	Check pump at authorized workshop
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	Unsuitable fuel	Drain tank and refill with correct fuel

	Incorrectly adjusted valves	Adjust valve-clearance ( warm engine )

	Other engine faults	Have engine checked by authorized workshop or mechanic

Diesel knock	Faulty injector	Replace faulty injector with spare. Repair faulty injector at authorized workshop

	Mechanical knock	Have authorized workshop or mechanic check engine

Smokey exhaust	Faulty injection pump	Check pump at authorized workshop

	Faulty Injector	Replace faulty injector
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	Clogged air cleaner	Clean air cleaner

Engine runs erratically	Air in injection pump	Bleed system

	Clogged fine filter	Check filter at authorized Workshop

	Faulty injection pump	Check pump at authorized workshop

	Decompression lever at open position	Set level at position 1

Engine fails to reach top r.p.m.	Faulty controls	Check controls
	Clogged air cleaner	Clean air filter

	Faulty centrifugal	Have authorized workshop or mechanic check governor
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	Faulty spring at injector pump	Replace spring

Engine races	Faulty injection pump	Have authorized workshop or mechanic check pump

	Faulty governor	Have authorized workshop or mechanic check governor

Oil pressure gauge shows insufficient pressure	Leakage in lubricating system	Check lubricating system

	Leaky reduction valve	Removal and clean valve

	Mechanical fault	Have authorized workshop or mechanic check engine

	Faulty gauge	replace gauge

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