AQ171A; AQ171C Cooling System Oil Cooler: 855839 Parts on group Oil Cooler: 855839: Pos. Part No Qty Parts name Comments 1. 855839 [1] Oil cooler 1A. 925255 [1] O-ring 2. 3. 824514 [1] Insert 4. 925092 [2] O-ring 5. 831044 [1] End cover 6. 831045 [1] End cover 7. 824522 [1] Centre bolt 8. 955983 [1] O-ring 9. 966871 [1] Shut-off cock Parts catalog : Sea Water Pump AQ171A, AQ171C Heat Exchanger and Water Filter with Installation Components: B AQ171C Heat Exchanger and Water Filter with Installation Components: A AQ171A Cooling System, Induction and Exhaust Manifold: B AQ171C Cooling System, Induction and Exhaust Manifold: A AQ171A Oil Cooler: 856271 Induction-and Exhaust Manifold: A AQ171A Induction-and Exhaust Manifold: B AQ171C