LUBRICATION SYSTEM-L.6 To Renew the Filter Canister 1. Unscrew the canister from the filter head (see Fig. L.12). 2. Check that the threaded adaptor is secure in the filter head and discard the old canister. Clean the filter head. 3. Using clean engine lubricating oil, lightly oil the top seal of the new canister. 4. Prime the canister with lubricating oil allowing time for the oil to filter through the element. 5. Screw the new canister on to the filter head until the canister seal just touches the head and then tighten by hand as detailed in the instructions on the canister. Where a tool is available, tighten to 15 Ibf It (2,07 kgf m). 6.
As the filter canister will normally be changed at the same time as the engine lubricating oil, refill the sump with oil, run the engine and check for oil leaks. Recheck the oil level after running the engine and top up as necessary. Oil Filter Assembly L11 In some instances the setscrews securing the filter head to the cylinder block are enclosed within the filter head and bowl assembly as shown in Fig. L.11. With this arrangement, the filter bowl has to be re- moved before the filter head can be detached from the block. When fitting the filter head joint, ensure that the holes in the joint line up with the corresponding drillings in the cylinder block.
By·Pass Valve Should the lubricating oil filter element be allowed to become contaminated to the extent where the lubri- cating oil has difficulty in passing through the element, then a pressure difference will build up between the inlet and outlet sides of the filter assembly. When this pressure reaches the figure given on Page B.10, a ball valve will open in the filter headcasting and allow un- filtered oil to by-pass the filter element to prevent the engine being starved of oil. l12