TROUBLE SHOOTING DIESEL ENGINES
TROUBLE
PROBABLE CAUSES
AND
Check causes given on next page
SYMPTOMS
In sequence shown -
ENGINE CRANKS, WILL NOT START
Fuel Pressure Normal..................................................................... la,b,d,24,11,10b, 16,17,18,19,5,8
Fuel Pressure Low ........................................................................................................... lb,c,2,3,4,24
Fuel Pressure High ............................................................................................................ la,10b,14,24
ENGINE STARTS, ERRATIC FIRING ALL CYLINDERS
Low Fuel Pressure .................................................................................................................. la,c,2,3,4
Adequate Fuel Pressure
Erratic at Idle Speed Only........................................................................................................... 6b
Erratic at Both Idle and High Speeds
Smoke.................................................................................................... lb,20b,5,24,3d,9,26,21
No Smoke ................................................................................... .1c,2,3,11,18,13,19,410,5,22
ENGINE MISSING ON ONE OR MORE CYLINDERS
Missing at Idle Speed Only ............................................................................................ 6b,24,8,9,10,5
Missing at Idle and High Speed
Smoke .......................................................................................................... 5,9,24,26,22,21,27,6a
No Smoke..................................................................................................a,c,2,3,4,9,10,5,21,22,6a
Blow-by at Crankcase Breather .............................................................................................. 23,27
ENGINE STALLS FREQUENTLY
Low or No Fuel Pressure ........................................................................................................c,2,3,417
Fuel Pressure Adequate
No Smoke..................................................................................................... 6b,11,13,17,16d,5,10
Black Smoke ................................................................................................................ 11,20,5,21,9
ENGINE SURGES...................................................................... 6b,3a,d,8,17, la,c,d,18,12,19,15,5,10,16d
ENGINE WILL NOT REACH NO LOAD GOV. RPM . . ............................. 1,6a,11,13,12,16,3,2,5,10,26
ENGINE OVERSPEEDS ........................................................................................ 6a,14,11,10b,15,12,20a
ENGINE LACKS POWER
No Smoke .................................................................................................. 1,3,22,10,5,6a,11,19,13,17
Black or Brown Smoke .............................................................................. 1,9,5,13,24,21,22,23,27,29
Blue or White Smoke.................................................................................................... 22,23,27,20,29
ENGINE WILL NOT SHUT DOWN ...............................................................................a,3,19,15,12c,10a,b
ENGINE OVERHEATS .................................................................................................22,29,5.9c,21,23,20
FUEL CONSUMPTION EXCESSIVE................................................. 3c,9,22,24,21,5,10,6a,27,20b,c,d.13
LUBRICATING OIL CONSUMPTION EXCESSIVE .......................................... 25,22,20a,24,21c,23,27,26
EXCESSIVE FUEL PRESSURE ............................................................................................................ 7,4
EXCESSIVE OIL PRESSURE ............................................................................................................ 30,31
NO OR LOW OIL PRESSURE ...................................................................................................... 30,31,28
LOW COMPRESSION ........................................................................................................ 23.27,26,22,21
CRANKCASE BUILDUP........................................................................................................... 26,22,23,27
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