7.8.5 Fuel prefilter – Filter element replacement

2. Open threaded vent plug (5) of contaminat‐ed filter. 3. Unlock drain valve (6) by pressing toggle and open it. 4. Drain water and contaminants from the fil‐ter. 5. Close drain valve (6). 6. Remove screws securing the cover and take off cover (2). 7. Remove spring housing (4) and filter ele‐ment (3). 8. Insert new filter element (3) and spring housing (4). 9. Fill filter housing with clean fuel. 10. Place new seal in cover (2). 11. Fit cover with gasket and secure it with screws. 12. Cut in the cut-out filter again. 13. Close threaded vent plug (5) when fuel emerges. 14. Set adjustable pointer of differential pres‐sure gauge (→ Page 105).

7.9 Charge-Air Cooling

7.9.1 Intercooler – Checking condensate drain line for coolant discharge and obstruction

DANGER

WARNING Unguarded rotating and moving engine components. Risk of serious injury – danger to life! • Take special care when working on a running engine.

Engine noise above 85 dB (A). Risk of damage to hearing! • Wear ear protectors.

WARNING Compressed air Risk of injury! • Do not direct compressed-air jet at persons. • Wear protective goggles / safety mask and ear protectors.

Checking intercooler condensate drain line for coolant discharge and obstruction

1. With the engine running, check the conden‐sate drain line on engine driving end for air discharge. 2. If no air emerges, remove condensate drain line and blow out with compressed air. 3. Replace obstructed drain line by new one. 4. Install condensate drain line. 5. If a large amount of coolant is continuously discharged, the intercooler is leaking. Con‐tact Service.

Emergency measures prior to engine start with a leaking intercooler

1. Remove injectors (→ Page 93). 2. Bar engine manually (→ Page 76). 3. Bar engine with starting system to blow out cylinder chambers (→ Page 77). 4. Install injectors (→ Page 94).