

The Caterpillar Diesel Marine Engine 3512 is a robust, high-performance engine designed for marine applications. Known for its reliability and efficiency, this engine is ideal for various marine vessels, providing exceptional power and durability in demanding environments.
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Tensioning Guide
Belt-diagram
C-120 pulleys
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Pre-built workflows to keep your asset running smoothly.
Daily Electrical System Inspection
Replace Roller and Pulley
Install Engine B-120
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Applied Industrial Technologies
Electrical Brothers
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Drive Motor
B2 Rollers
Tensioning System
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Caterpillar Diesel Marine Engine 3512
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11000 Hours Top End Maintenance
Perform every 11000 hours or 1,460,000 liter (385,500 U.S. gallon) of Fuel Rated Up to 1300 rpm
Inspect Cylinder Heads
Test Injectors
To minimize downtime and provide you with the lowest cost and highest value, Caterpillar recommends that the engine be overhauled before failure by scheduling an overhaul with your Caterpillar dealer;
Sign off on the 11000 Hours Top End Maintenance
1 Daily Lubricators Maintanance
Inspect Air Starting Motor and Air Prelube Pump Lubricators
Adjust the air starting system pressure, if necessary
Fill all air starting system lubricators
NOTICE: Never allow the air lubricator jar to become empty. The starting and prelube pump motors will be damaged by lack of proper lubrication
The vanes of the air starting motor and air prelube pump motor are lubricated with a fine oil mist from the starting motor oiler while the air starting motor is operating
When the air lubricator jar becomes half empty, remove oil filler plug and fill the jar with clean diesel fuel or kerosene.
Refer to the Lubricant Viscosity Recommendations for more information
Sign off on the daily lubricators maintenance
22000 Hours Engine Overhaul
Perform every 22000 hours or 2,920,000 liter (770,000 U.S. gallon) of Fuel Rated Up to 1300 rpm
Inspect/Rebuild or Exchange if necessary Cylinder Heads
Inspect/Rebuild or Exchange if necessary Connecting Rods
Inspect/Rebuild or Exchange if necessary Cylinder Liners
Inspect/Rebuild or Exchange if necessary Pistons
Inspect/Rebuild or Exchange if necessary Turbochargers
Inspect/Rebuild or Exchange if necessary Cam Followers
Inspect/Rebuild or Exchange if necessary Fuel Transfer Pump
Inspect/Rebuild or Exchange if necessary Prelube Pump
1000 Hours Marine Gear Oil Replacement
- Perform every 1000 hours or 133,500 liter (35,000 U.S. gallon) of Fuel Rated Up to 1300 rpm, 164,000 liter (43,200 U.S. gallon) of Fuel Rated 1301 to 1600 rpm, 194,000 liter (51,200 U.S. gallon) of Fuel Rated 1601 to 1800 rpm
- Change oil of Marine Gear
WARNING!
Use caution when draining oil or changing filters
Hot oil or components can cause burns if they contact skin
With the oil warm and the engine stopped, drain the marine gear
1. Remove the marine gear drain plug and allow the oil to drain
2. Clean and install the drain plug
If a Sump Pump is Used to Drain Oil
1000 Hours Marine Gear Breather Cleaning
- Perform every 1000 hours or 133,500 liter (35,000 U.S. gallon) of Fuel Rated Up to 1300 rpm, 164,000 liter (43,200 U.S. gallon) of Fuel Rated 1301 to 1600 rpm, 194,000 liter (51,200 U.S. gallon) of Fuel Rated 1601 to 1800 rpm
- Clean the Marine Gear Breather
1. Remove the breather
2. Clean the breather with clean, nonflammable solvent
3. Install the breather
- Fill the Marine Gear
NOTICE:
Be sure both valves (one to the marine gear and one to the engine oil pan) are closed. Otherwise, a transfer of oil may occur during operation and damage could result
Fill the marine gear to the FULL mark on the oil level gauge. Refer to the Refill Capacities chart for the correct amount of oil
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Silicone Lubricant
5N5561
Torque Screwdriver Tool Group
6V4980
Woodward Governor
UG8L
Hydrosolv 100, 208L (55 U.S. Gal) Drum
8T7571
Cooling System Cleaner Standard Type In The 2 Liter (1/2U.S. Gallon)
6V4511
Silicone Lubricant
5N5561
Torque Screwdriver Tool Group
6V4980
Woodward Governor
UG8L
Hydrosolv 100, 208L (55 U.S. Gal) Drum
8T7571
Cooling System Cleaner Standard Type In The 2 Liter (1/2U.S. Gallon)
6V4511
Silicone Lubricant
5N5561
Torque Screwdriver Tool Group
6V4980
Woodward Governor
UG8L
Hydrosolv 100, 208L (55 U.S. Gal) Drum
8T7571
Cooling System Cleaner Standard Type In The 2 Liter (1/2U.S. Gallon)
6V4511
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