DG30, DG50, DG60, DG80, DG100, DG125 and DG150 Generator Sets Caterpillar

Product Description

Usage:

DG50 NB4

Show/hide table

Table 1
Engine	3.0L	5.0L/5.7L	8.8L/8.8L Turbo
Type	3.0L L4	5.7L V-8 GEN-1E	8.8L V-8
Displacement cc (c.i.d.)	2966 (181)	5735 (350)	8800 (537)
Compression Ratio	10.5:1	9.4:1	10:1
Valve Configuration	Push Rod Actuated Overhead Valve	Push Rod Actuated Overhead Valve	Push Rod Actuated Overhead Valve
Valve Lifters	Flat Follower	Hydraulic Roller	Hydraulic Roller
Bore x Stroke mm (inches)	101.60x91.44 (4.00x3.60)	101.60x88.39 (4.00x3.48)	110.49x114.30 (4.35x4.50)
Main Bearing Caps	2 Bolt	2 Bolt	4 Bolt
Firing Order	1–3–4–2	1–8–4–3–6–5–7–2	1–8–7–2–6–5–4–3
Minimum Oil Pressure (Hot)	6 psi at 1000 rpm 18 psi at 2000 rpm	6 psi at 1000 rpm 18 psi at 2000 rpm	5 psi at 1000 rpm 15 psi at 2000 rpm
Engine Rotation (Flywheel End)	CCW	CCW	CCW
Ignition System	High Voltage Switch (HVS)	High Voltage Switch (HVS)	Distributor-less Electronic (ECU)
Ignition Timing	ECM Controlled Not Adjustable	ECM Controlled Not Adjustable	ECM Controlled Not Adjustable
Spark Plug Gap	0.035 in	0.035 in
Valve Clearance (Lash) Intake Exhaust	Half to 1 Turn Down From 0 Lash	1 Turn Down From 0 Lash	Net Lash No Adjustment

Gas Package Operating Pressures for Natural Gas

Show/hide table

Table 2
Model	Standard Gas Train				Optional Upgrade Gas Train
	Minimum Operating Pressure		Maximum Operating Pressure		Minimum Operating Pressure		Maximum Operating Pressure
	in H₂O	kPa	in H₂O	kPa	in H₂O	kPa	in H₂O	kPa
DG30–2	9.5	2.4	27.7	6.9	8.0	2.0	27.7	6.9
DG50–2	8.0	2.0	27.7	6.9	Not Available		Not Available
DG60–2	8.0	2.0	27.7	6.9	Not Available		Not Available
DG80–2	8.5	2.1	27.7	6.9	Not Available		Not Available
DG100–2	10.0	2.5	27.7	6.9	Not Available		Not Available
DG125–2	10.0	2.5	27.7	6.9	8.0	2.0	27.7	6.9
DG150–2	10.5	2.6	27.7	6.9	8.5	2.1	27.7	6.9

Gas Package Operating Pressures for LP Vapor

Show/hide table

Table 3
Model	Standard Gas Train				Optional Upgrade Gas Train
	Minimum Operating Pressure		Maximum Operating Pressure		Minimum Operating Pressure		Maximum Operating Pressure
	in H₂O	kPa	in H₂O	kPa	in H₂O	kPa	in H₂O	kPa
DG30–2	8.5	2.1	27.7	6.9	8.0	2.0	27.7	6.9
DG50–2	8.0	2.0	27.7	6.9	Not Available		Not Available
DG60–2	8.0	2.0	27.7	6.9	Not Available		Not Available
DG80–2	Not Available		Not Available		Not Available		Not Available
DG100–2	10.0	2.2	27.7	6.9	Not Available		Not Available
DG125–2	Not Available		Not Available		Not Available		Not Available
DG150–2	8.5	2.1	27.7	6.9	8.0	2.0	27.7	6.9

Your engine uses one of two types of ignition systems. 1) Distributor-less electronic ignition and 2) High Voltage Switch (HVS) ignition. Both types of ignition are controlled by the engine ECU. Distributor-less electronic ignition is utilized on the 8.8L engine. All other engine models use an HVS ignition system which consists of a distributor and HVS ignition coil.

Engine Identification

Show/hide table




Illustration 1	g06078980
(1) Engine family (2) Serial number

An identification label is affixed to the right side of the engine on the rocker cover when looking at the engine from the flywheel end. (The engine serial number is also stamped into the left side of the cylinder block near the engine flywheel.) The label contains the engine family number and a serial number which identifies the engine from other Cat engines. The engine model and serial number are required when seeking information concerning the engine and/or ordering replacement service parts.