5T5979 SEAL Caterpillar parts
789, 789B
Rating:
Alternative (cross code) number:
CA5T5979
5T-5979
5T5979
CA5T5979
5T-5979
5T5979
Weight: 1 pounds 0 kg.
TRUCK,
Information:
Available Installation and Alignment Instructions
Allowance for Expansion due to Thermal Growth
Cast iron has a thermal expansion coefficient of 0.0000066 in. per in. per Degree F (0.000012 mm per mm per Degree C). Steel has an average thermal expansion coefficient of 0.0000063 in. per in. per Degree F (0.000011 mm per mm per Degree C).The engine mounting system must allow for this expansion through the proper use and placement of clearance bolts, fitted bolts, and dowels. Failure to allow for thermal expansion will result in driven equipment misalignment and engine block distortion.Compensation offsets must be incorporated into alignment procedures to accommodate this growth when alignment is performed cold.Thermal expansion = Expansion Coefficient × Linear Distance* × Delta T*Linear distance is the length or width of engine for horizontal growth and the distance between the mounting surface and the crankshaft centerline for vertical growth.Examples: 3606 - Cast Iron Block, Length of block between rear fitted bolt and front clearance bolt in 87.6 in. (2226 mm). Delta T = 130°F (72°C). Expansion allowance required is: 0.0000066 (0.000012) × 87.6 in. (2226 mm) × 130°F (72°C) = 0.075 in. (1.9 mm)Collision Blocks for Marine Engines
When marine classification societies or local marine practice requires the use of collision blocks, they should be located with sufficient clearance to allow for thermal growth of the engine. Prefabricate the collision blocks and install them while the engine is at operating temperature with approximately 0.005 in (0.12 mm) hot clearance. Collision blocks are recommended to resist the shock loads encountered in hard docking collisions and groundings.Types of Misalignment
Parallel or bore misalignment occurs when centerlines of driven equipment and engine are parallel but not in the same plane.Angular or face misalignment occurs when centerlines of driven equipment and engines are not parallel.Dial Indicator Quick Check
When both shafts are rotated together, the algebraic sum of the readings at D and B should equal the reading at C. This check is useful for identifying improper indicator setup or procedure. The example shown is out of alignment.Required Foundation Depth for Stationary Installations
Calculate foundation depth to equal generator set weight by:FD = foundation depth in feet (meter)W = total wet weight of generator set in pounds (kg) Use 125% of actual weight if vibration isolators are not used.D = density of concrete in pounds per cubic foot (kg/m3) Use 150 for English unit and 2402.8 for metric unit.B = foundation width in feet (meter)L = foundation length in feet (meter)Pressure on Supporting Material
Where: P = Pressure in psi (kpa)W = Weight in pounds (kg)A = Area in square inches (m2)Pressure imposed by the generator set weight must be less than the load-carrying capacity of supporting material.General Torque Specifications
The following charts give general torque values for fasteners of SAE Grade 5 or better and Metric ISO Grade 8.8.Torques for Bolts and Nuts with Standard Threads
Torques for Taperlock Studs
Metric ISO Thread
Allowance for Expansion due to Thermal Growth
Cast iron has a thermal expansion coefficient of 0.0000066 in. per in. per Degree F (0.000012 mm per mm per Degree C). Steel has an average thermal expansion coefficient of 0.0000063 in. per in. per Degree F (0.000011 mm per mm per Degree C).The engine mounting system must allow for this expansion through the proper use and placement of clearance bolts, fitted bolts, and dowels. Failure to allow for thermal expansion will result in driven equipment misalignment and engine block distortion.Compensation offsets must be incorporated into alignment procedures to accommodate this growth when alignment is performed cold.Thermal expansion = Expansion Coefficient × Linear Distance* × Delta T*Linear distance is the length or width of engine for horizontal growth and the distance between the mounting surface and the crankshaft centerline for vertical growth.Examples: 3606 - Cast Iron Block, Length of block between rear fitted bolt and front clearance bolt in 87.6 in. (2226 mm). Delta T = 130°F (72°C). Expansion allowance required is: 0.0000066 (0.000012) × 87.6 in. (2226 mm) × 130°F (72°C) = 0.075 in. (1.9 mm)Collision Blocks for Marine Engines
When marine classification societies or local marine practice requires the use of collision blocks, they should be located with sufficient clearance to allow for thermal growth of the engine. Prefabricate the collision blocks and install them while the engine is at operating temperature with approximately 0.005 in (0.12 mm) hot clearance. Collision blocks are recommended to resist the shock loads encountered in hard docking collisions and groundings.Types of Misalignment
Parallel or bore misalignment occurs when centerlines of driven equipment and engine are parallel but not in the same plane.Angular or face misalignment occurs when centerlines of driven equipment and engines are not parallel.Dial Indicator Quick Check
When both shafts are rotated together, the algebraic sum of the readings at D and B should equal the reading at C. This check is useful for identifying improper indicator setup or procedure. The example shown is out of alignment.Required Foundation Depth for Stationary Installations
Calculate foundation depth to equal generator set weight by:FD = foundation depth in feet (meter)W = total wet weight of generator set in pounds (kg) Use 125% of actual weight if vibration isolators are not used.D = density of concrete in pounds per cubic foot (kg/m3) Use 150 for English unit and 2402.8 for metric unit.B = foundation width in feet (meter)L = foundation length in feet (meter)Pressure on Supporting Material
Where: P = Pressure in psi (kpa)W = Weight in pounds (kg)A = Area in square inches (m2)Pressure imposed by the generator set weight must be less than the load-carrying capacity of supporting material.General Torque Specifications
The following charts give general torque values for fasteners of SAE Grade 5 or better and Metric ISO Grade 8.8.Torques for Bolts and Nuts with Standard Threads
Torques for Taperlock Studs
Metric ISO Thread
Caterpillar parts catalog:
Parts seal Caterpillar catalog:
8T0675
SEAL-O-RING
785, 789, 793, 793B
785, 789, 793, 793B
9X7388
SEAL-U-CUP
789, 789B, 793, 793B
789, 789B, 793, 793B
9X7350
SEAL-LIP TYPE
793, 793B, 793C, 793D, 793F, 793F AC, 793F CMD, 793F OEM, 793F-XQ
793, 793B, 793C, 793D, 793F, 793F AC, 793F CMD, 793F OEM, 793F-XQ
9X7364
SEAL-U-CUP
793, 793B, 793C
793, 793B, 793C
8Y6975
SEAL-GLASS
793, 793B, 793C, 797
793, 793B, 793C, 797
9X7315
SEAL AS
793, 793B
793, 793B
1608181
SEAL-LIP TYPE
769C, 769D, 771C, 771D, 773B, 773D, 775B, 775D
769C, 769D, 771C, 771D, 773B, 773D, 775B, 775D
8T6923
SEAL AS
789, 789B, 789C, 789D
789, 789B, 789C, 789D
4T4803
SEAL
785, 789, 789B, 789C, 789D
785, 789, 789B, 789C, 789D
1U4623
SEAL-RING
785, 785C, 789, 789B, 789C, 789D
785, 785C, 789, 789B, 789C, 789D
8T7574
SEAL-RING
789, 789B, 789C, 789D
789, 789B, 789C, 789D
1374349
SEAL-O-RING
789B, 789C, 789D
789B, 789C, 789D