Auto Service Professional

DEC 2018

Magazine for the auto service professional

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10 A S P D e c e m b e r 2 018 C o m p a n i e s H e l p i n g T e c h s T The majority of automotive gasket replacement today is referred to as soft gas- kets. is would include engi- neered fiber material, molded two-dimensional rubber prod- ucts, and the three-dimensional "press into place" style gaskets. ese products generally seal oil or coolant below a temperature of 300°F. e two probable reasons these gaskets may be replaced are leakage or disassembly. In the case of leakage, it is critical to investigate the root cause of the problem. Gaskets are not prone to leakage from material failure as they once were, so close inspection is in order: hardware, missing fastener, unusual heat source could be a few. e more likely situation is removal due to some other component. In each case, the preparation of the component is just as important. A flat surface is easy to in- spect and relatively easy to clean, but small particles of the previous gasket, or other addition sealers, need to be removed. e more compli- cated applications are "push in place" applications; they are not always so easy to in- spect, as they are black and the groove is filled with oil. e groove needs to be free of any material. It is typically plastic, so one must be careful not to damage the component. An item such as a toothpick is a good way to determine if there is an obstruction that will put stress on the new gasket. e final step and typically most misunderstood is ensur- ing surface friction, as so gaskets require surface friction for them to work. While the latitude – or surface finish – is quite wide, the use of any oil on the surface will cause failure of the gasket due to reduced fric- tion. Dry means dry! e pe- troleum distillate in carb and choke cleaner does not leave the surface dry, whereas brake cleaner and contact cleaner does leave the surface dry and costs the same price. e small pieces of le over gasket can hold oil as well as the groove that held the previous gasket. It is critical for the areas to be dry. When there is no friction on the surface, the material will squeeze out prematurely and is now susceptible to leak- age and failure. ■ CLEAN AND DRY MAHLE Aftermarket Inc. 23030 MAHLE Drive Farmington Hills, MI 48335 USA 248-437-9700 www.mahle-aftermarket.com

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