Engine
SHOP MANUAL
Ch 1 page 211
L1 – Low pressure check
1. Open the test connection on the high pressure pump.
2. Pump using the hand pump. Check that fuel comes out of the test connection.
3. Turn the engine over using the starter motor. Check that fuel comes out of the test connection.
4. Close the test connection.
L2 – Checking the suction filter
Note: When renewing the suction filter, check the following with the suction filter removed.
1. Pump with the hand pump and check that fuel free from air flows out of the hole on the inside of the filter housing.
2. If no fuel comes out, check the suction strainer and all joints on the suction pipe up to the fuel tank armature.
Renew the seals and check-tighten the connections.
3. If fuel comes out, fit a new filter and bleed the fuel system.
L3 – Checking the feed pump
1. Detach the pipe for outlet fuel from the feed pump. Place a container under the free end of the pipe.
2. Turn the engine over using the starter motor for about 20 seconds. The feed pump provides about 1.2 l/min. The
correct quantity for 20 seconds is 0.3-0.4 litres.
L4 – Checking the feed pump drive
1. Remove the feed pump from the high pressure pump bracket.
2. Turn the feed pump by hand. The pump should rotate freely and the drive shaft in the pump should be intact. 3.
Check that the drive pins in the high pressure pump are intact.
4. Turn the engine over using the starter motor. Check that the feed pump drive in the high pressure pump rotates.
L5 – Checking the high pressure pump drive
1. Remove the high pressure pump.
2. Turn the engine over using the starter motor. Check that the high pressure pump drive rotates in the timing gear.
3. Renew the pump drive gear if it does not rotate or is damaged. Check for resulting damage to the high pressure
pump gear. Damaged gears should be renewed.
4. If the pump drive gear in the timing gear rotates and is not damaged:
Check that the high pressure pump gear is properly seated on the shaft. If the gear is loose, the shaft may be dam-
aged. Do not tighten the gear. Renew the high pressure pump. If the gear is jammed, the high pressure pump is
defective. Renew the high pressure pump.
L6 – Checking the supply pressure at the test connection on the high pressure pump
1. Connect pressure gauge 99 362 to the test connection on the high pressure pump and open the test connection.
2. Turn the engine over using the starter motor. Read the pressure after approximately 20 seconds.
The pressure should be more than 2 bar.
Descriptions, Low pressure check
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