MAHLE says that hands are the best tools when replacing spin-on oil filters, warning against the use of tools.
MAHLE Aftermarket UK has reminded technicians of the importance and benefits of correctly installing spin-on oil filters, in its latest technical messenger bulletin.
Oil filters are available in two variants: filter elements (OX), and spin-on filters (OC). The two filter types differ not only in design, but also significantly in the way they are replaced.
Incorrect installation of OC filters can lead to corrosion damage and ultimately oil leakage, and MAHLE is reiterating the importance of not using specialist tools to install the new filter, with OC filters requiring reinstallation by hand to prevent damage.
Correct replacement
In the case of OX filters, the cover of the oil filter housing is loosened with a tool, such as a socket spanner, and then retightened using the same tool once the filter element has been replaced.
Spin-on filters must be replaced by removing the old filter with a special removal tool such as MAHLE OCS. However, this tool must not be used to install the new filter. OC filters may only be tightened by hand and in accordance with the vehicle manufacturer’s specifications.
It’s crucial that technicians pay special attention to the oil filter flange seals in case these are corroded and require replacement. The old seal should be replaced and cleaned, and the new filter seal should be coated with clean engine oil.
The new spin-on filter should be screwed into place by turning it the specified minimum number of times until the seal is in contact, and then tightened by hand to the specified torque, or angle of rotation.
The newly installed oil filter can then be filled with engine oil. Technicians should then start the engine, check the oil level, and check for any leaks.
Tightening the filters with a removal tool can damage the surface coating, leading to serious problems. Because the spin-on filter is often in an exposed position on the engine, it’s subjected to high levels of stress from water spray, exhaust heat and other debris. It can corrode rapidly if the protective coating is damaged. Constantly changing temperatures and winter road salt can accelerate rusting to the point where the filter leaks and oil escapes.
