Service Manual

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Look for or check

SMOKING

LIQUID-COOLED ENGINE TROUBLESHOOTING WARNING SIGNS

AIRFILTER

OIL LEVEL

COOLANT LEVEL

FUEL SYSTEM

ENGINE TIMING

COMPRESSION

BLACK SMOKE BLUE SMOKE

WHITE SMOKE

GAS: Check condition of air

filter, replace if in question.

Restricted air filter can cause

a rich running condition.

Check condition of air filter,

replace if in question.

DIESEL: Check condition of air filter,

replace if in question. Restricted air fil-

ter can cause a high intake vacuum and

potentially pull oil from air breather.

Check and maintain proper

oil level. Refer to engine

owner manual for proper

grade and type.

Check and maintain proper oil level.

Refer to engine owner manual for proper

grade and type.

Check for signs of coolant in engine oil.

Additionally do compression and leak-

down test on engine.

DIESEL: White smoke may be

an indication of low combus-

tion temperature. Check and

reset valve cleanances as

required. Perform compression

test on engine.

DIESEL: Replace fuel filter, clogged

fuel filter, air in fuel lines or restricted

flow can cause white smoke.

GAS: Check for proper choke

operation. Inspect spark

plugs firing end condition to

aid in diagnosis

DIESEL: Black smoke can be

caused by advanced timing

DIESEL: White smoke may be

an indication of retarded

engine timing.

Perform compression and

leakdown testing of engine

as outlined in repair manual

Pressure test cooling system,

follow procedure and values

found in repair manual

AS Overview: Rich running engine

DIESEL Overview: Timing advanced/

overloaded engine, dirty nozzle or

faulty turbocharger.

AS Overview: Burning coolant

DIESEL Overview: Low combustion temp.,

lack of fuel, improper fuel, defective nozzle,

retarded timing, burning coolant.

AS Overview: Burning oil

DIESEL Overview: Burning oil

Check and maintain proper

oil level. Refer to engine

owner manual for proper

grade and type.

Maintain a 50/50 mix of water and

antifreeze. Keep coolant level full.

Look for signs of oil in coolant if found

do compression test and

pressure test of cooling system.

The best way to resolve a

problem is to identify it by

testing. A compression test,

leakdown or pressure test is

required prior to any engine

disassembly.

ESEL: If fuel primer is getting pulled

down during operation, look for blockage

in tank, fuel line, shut off valve or filter.

Maintain a 50/50 mix of water

and antifreeze. Keep coolant

level full.

Perform compression and

leakdown testing of engine as

outlined in repair manual

Ensure fuel is of proper grade

minimum of 40 cetane

Always consult engine owners manual and repair manual for specific values and procedures. www

.briggsandstratton.com or www

.briggsnetwork.com

Summary of content (5 pages)

PAGE 1
SMOKING Look for or check LIQUID-COOLED ENGINE TROUBLESHOOTING WARNING SIGNS BLACK SMOKE GAS Overview: Rich running engine DIESEL Overview: Timing advanced/ overloaded engine, dirty nozzle or faulty turbocharger. WHITE SMOKE BLUE SMOKE GAS Overview: Burning coolant DIESEL Overview: Low combustion temp., lack of fuel, improper fuel, defective nozzle, retarded timing, burning coolant.
PAGE 2
OVERHEATING Look for or check LIQUID-COOLED ENGINE TROUBLESHOOTING WARNING SIGNS COOLANT TEMPERATURE GAUGE READS ABOVE TEMPATURE LIGHT COMES ON 220˚ F (105˚ C) NORMAL RANGE 175˚- 220˚ F (80˚-104˚ C) COOLANT OVERFLOW AT WATER RESERVOIR RADIATOR Inspect debris guards. Note there may be more than one. See owners manual for engine/equipment Clean debris from debris guard radiator fins. Check radiator condition, look for leaks or any visible damage or kinked / bulged hoses.
PAGE 3
Vanguard 3/LC Engine Compression Engine Model 700G 950G 954G 700D 850D 950D 950DT/954DT Nominal Valve 192 psi at 400rpm 200 psi at 400 rpm 215 psi at 400 rpm 498 psi at 300 rpm 512 psi at 300 rpm 526 psi at 300 rpm 526 psi at 300 rpm Minimum Valve 142 psi at 400 rpm 150 psi at 400 rpm 155 psi at 400 rpm 384 psi at 300 rpm 384 psi at 300 rpm 384 psi at 300 rpm 384 psi at 300 rpm Checking Compression Pressure on Vanguard 3/LC Diesel Engines: Cylinder compression testing is a valuable tool that can reveal
PAGE 4
3/LC ENGINE TROUBLESHOOTING WORKSHEET Equipment Manufacturer: Warranty Claim No. Customer Name: Hours Used: Date of Purchase: Control No. Engine Model: Dealer Name: Engine Type: Dealer Phone: Engine Code S/N: COMBUSTION Check valve clearance Dealer Fax: Adjust YES/GOOD NO/BAD Check compression pressure. Compression test Cyl.#1 Cyl.#2 Cyl.#3 Leakdown test FINDINGS > Cyl.#1 Cyl.#2 Cyl.
PAGE 5
COOLANT Engine may not be warming up due to defective thermostat Coolant level in surge tank Check alternator belt deflection Check for leaks Check level of antifreeze Pressure test radiator NO/BAD FINDINGS YES/GOOD NO/BAD FINDINGS Cyl.#1 Cyl.#2 Cyl.#3 Cyl.#1 Cyl.#2 Cyl.#3 YES/GOOD NO/BAD FINDINGS Cyl.#1 Cyl.#2 Cyl.