G3612 and G3616 Engines Caterpillar

Specifications

Usage:

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Table 1
Engine Specifications
	G3612	G3616
Operating RPM	750 to 1000
Low Idle RPM	550
Cylinders and Arrangement	50 degree vee 12	50 degree vee 16
Bore	300 mm (11.8 inch)
Stroke	300 mm (11.8 inch)
Aspiration	TA
Compression Ratio	9.2:1 10.5:1 11:1
Displacement Per Cylinder	21.2 L (1294 in³)
Total Displacement	254.4 L (15528 in³)	339.2 L (20704 in³)
Mean Velocity of the Pistons at 900 RPM	9 m/s (1772 ft/min)
Mean Velocity of the Pistons at 1000 RPM	10 m/s (1969 ft/min)
Flywheel Rotation (Standard)	Counterclockwise
Fuel	See this Operation and Maintenance Manual, "Refill Capacities and Recommendations" (Maintenance Section). Also, see the Application and Installation Guide.
Method of Starting	Air starting motors
Performance of the Cooling System	See the Application and Installation Guide.
Maximum Allowable Exhaust Back Pressure	3 kPa (12 inches of H₂O)
Maximum Allowable Inlet Air Restriction	3.7 kPa (15 inches of H₂O)
Air Cleaners	Remote
Valve Lash (Gas Admission Valve)⁽¹⁾	0.64 mm (.025 inch)
Inlet Valve Lash	0.50 mm (.020 inch)
Exhaust Valve Lash	1.25 mm (.050 inch)

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⁽¹⁾	This measurement is for newer engines. For earlier engines, the valve lash is set by turning an adjustment screw and counting the “clicks”.

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Illustration 1	g00291490
G3612 Engine cylinder numbers (A) Gas admission valves (B) Inlet valves (C) Exhaust valves (D) Front

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Illustration 2	g00291492
G3616 Engine cylinder numbers (A) Gas admission valves (B) Inlet valves (C) Exhaust valves (D) Front

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Illustration 3	g00291362
SAE standard engine crankshaft rotation (1) Jacket water pump (2) Aftercooler and oil cooler pump (3) Oil pump

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Illustration 4	g00291363
SAE standard engine crankshaft rotation (4) Water outlet (5) Water inlet (6) Oil outlet (7) Oil inlet

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Table 2
Front Drives
Component	Speed⁽¹⁾
Jacket Water Pump	2522
Aftercooler and Oil Cooler Pump	2522
Oil Pump	1524

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⁽¹⁾	The speed of the component is listed for an engine that is operating at 1000 rpm. For an engine that is operating at 900 rpm, multiply the speed of the component by .9. For an engine that is operating at 800 rpm, multiply the speed of the component by .8.

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Illustration 5	g00268306
SAE standard engine crankshaft rotation (1) Crankshaft (2) Idler (3) Idler (4) Jacket water pump (5) Aftercooler and oil cooler pump (6) Auxiliary pump (7) Oil pump

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Table 3
Front Gear Train
Gear	Number Of Teeth
(1) Crankshaft	96
(2) Idler	68
(3) Idler	67
(4) Jacket Water Pump	38
(5) Aftercooler and Oil Cooler Pump	38
(6) Auxiliary Pump	43
(7) Oil Pump	63

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Illustration 6	g00268312
SAE standard engine crankshaft rotation (1) Crankshaft (2) Large cluster idler (3) Small cluster idler (4) Camshaft (5) Idler

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Table 5
Approximate Engine Weights
Dry Weight of the Engine with Attachments	G3612	G3616
	25084 kg (55300 lb)	29892 kg (65900 lb)

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Table 6
Approximate Weights Of Serviceable Parts
Component	G3612 Engine	G3616 Engine
Cylinder Block	6805 kg (14971 lb)	9625 kg (21219 lb)
Bearing Cap	65 kg (144 lb)
Crankshaft	2091 kg (4600 lb)	3800 kg (8378 lb)
Flywheel Assembly	491 kg (1082 lb)
Crankshaft Vibration Damper	183 kg (403 lb)
Cylinder Head Assembly	196 kg (432 lb)
Cylinder Liner	110 kg (243 lb)
Piston Assembly	48 kg (106 lb)
Piston Pin	19 kg (42 lb)
Piston Rod Assembly	57 kg (126 lb)
Turbocharger (one)	401 kg (884 lb)
Aftercooler Core⁽¹⁾	94 kg (207 lb)	125 kg (275 lb)
Front Housing	258 kg (569 lb)
Rear Housing	350 kg (772 lb)
Used Air Cleaner Element	29 kg (64 lb)

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⁽¹⁾	The weight that is listed is for a first stage aftercooler. A second stage aftercooler and an aftercooler with a deeper core are also available.

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Table 7
Approximate Weights Of Package Generator Sets
Item	G3612 Engine	G3616 Engine
Engine⁽¹⁾	25084 kg (55300 lb)	29892 kg (65900 lb)
Generator	15855 kg (34954 lb)
Module	1650 kg (3638 lb)
Mounting Base	12700 kg (28000 lb)
Coupling	977 kg (2154 lb)
Total	56266 kg (124045 lb)	61074 kg (134645 lb)