OM-C3 11/21
43
Service and Maintenance - 500 Hour
Remove, Inspect and Clean Engine Aftercooler Core
IMPORTANT: Initially remove and inspect the aftercooler
core at 250 hour or three month service interval on a new
engine. Then, remove and clean at every 500 hour or 12
month interval thereafter.
IMPORTANT: Ensure that replacement seals and o-rings
are readily available before removing aftercooler core.
Air side seals will be destroyed during core removal.
1. Close sea cocks and drain the sea water system.
2. Loosen clamp (A, right) and remove air filter.
3. Loosen clamps (B, right), remove mounting bolt
(C, right) and remove water line from rear of
aftercooler.
4. Remove four cap screws (D, right) and remove rear
cap and O-ring.
5. Remove clamps (E, right) and remove hoses from front
cap.
6. Remove four cap screws (F, right), front cap and
O-ring.
7. Remove aftercooler core from the rear of the engine.
8. Thoroughly clean all buildup from both end caps.
9. Use a 4.76 mm (3/16 in.) diameter brass rod to clean
out any buildup in each tube. Run the rod the entire
length of each tube to push debris out (below).
10. Flush the tubes with clean water, making sure all tubes
are cleared of debris. Clean (with brass rod) and flush
aftercooler core again if necessary to remove any
remaining debris from tubes.
If you suspect that your aftercooler core is defective, have
your authorized servicing dealer or engine distributor
pressure test for leaks. Replace aftercooler core as
required.
Clamp (A) and air fllter
Rear clamp removal - Clamps (B), Mounting bolt (C), Cap
screws (D)
Front clamp removal - Clamps (E), Cap screws (F)
Aftercooler core cleaning
