G3612 and G3616 Engines Specifications Caterpillar


Specifications
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1.1. Engine Specifications
2.1. Drives and Gear Trains
3.2. Front Drives
4.2. Engine Front Gear Train
5.2. Engine Rear Gear Train
6.1. Reference Weights

Engine Specifications

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


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


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

Drives and Gear Trains

Front Drives



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


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

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

Engine Front Gear Train



Illustration 5g00268306
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

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 

Engine Rear Gear Train



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

Table 4
Rear Gear Train 
Gear  Number Of Teeth 
(1) Crankshaft  81 
(2) Large Cluster Idler  90 
(3) Small Cluster Idler  45 
(4) Camshaft  81 
(5) Idler  81 

Reference Weights

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

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) 
(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.

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) 
(1) The weights of the engines that are listed includes attachments that are mounted on the engines. The engine weights are dry weights.

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