Peugeot 405 Manual

Hose and fluid leak check (6000 Mile (10 000 km) / 6 Month Service)
Routine maintenance and servicing / Hose and fluid leak check (6000 Mile (10 000 km) / 6 Month Service)


Note: On models from 1994, the maker’s specified interval for this procedure is 9000 miles (15 000 km) or 12 months.

1 Visually inspect the engine joint faces, gaskets and seals for any signs of water, oil or fuel leaks. Pay particular attention to the areas around the camshaft cover, cylinder head, oil filter and sump joint faces. Bear in mind that, over a period of time, some slight seepage from these areas is to be expected. What you are really looking for is any indication of a serious leak. Should a leak be found, renew the offending gasket or oil seal by referring to the appropriate Chapters in this manual.

2 Also check the security and condition of all the engine-related pipes and hoses. Ensure that all cable-ties or securing clips are in place and in good condition. Clips which are broken or missing can lead to chafing of the hoses, pipes, or wiring, which could cause more serious problems in the future.

3 Carefully check the radiator hoses and heater hoses along their entire length. Renew any hose which is cracked, swollen, or deteriorated. Cracks will show up better if the hose is squeezed. Pay close attention to the hose clips that secure the hoses to the cooling system components. Hose clips can pinch and puncture hoses, resulting in cooling system leaks. If the original Peugeot crimpedtype hose clips are used, it may be a good idea to replace them with standard wormdrive hose clips.

4 Inspect the cooling system (hoses, joint faces, etc.) for leaks (see Haynes Hint).

5 Where any problems of this nature are found on system components, renew the component or gasket, referring to Chapter 3.

6 Where applicable, inspect the automatic transmission fluid cooler hoses for leaks or deterioration.

7 With the vehicle raised, inspect the petrol tank and filler neck for punctures, cracks, and other damage. The connection between the filler neck and tank is especially critical.

Sometimes, a rubber filler neck or connecting hose will leak due to loose retaining clamps or deteriorated rubber.

8 Carefully check all rubber hoses and metal fuel lines leading away from the petrol tank.

Check for loose connections, deteriorated hoses, crimped lines, and other damage. Pay particular attention to the vent pipes and hoses, which often loop up around the filler neck, and can become blocked or crimped.

Follow the lines to the front of the vehicle, carefully inspecting them all the way. Renew damaged sections as necessary.

9 From within the engine compartment, check the security of all fuel hose attachments and pipe unions, and inspect the fuel hoses and vacuum hoses for kinks, chafing and deterioration.

10 Where applicable, check the condition of the power steering fluid hoses and pipes.


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