Under the upper timing cover there is a long u shaped seal , when installing the upper cover you need to be careful and install it slowly, I use a feelr gauge (thin) and a light to make sure it did not get sucked in when installing the cover. On the 119 motor you can use a old microfiche card it works really good. The same can be done on the 104 motor.

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Mercedes Technician 7 Years (retired to Hyundai)
2000 Dodge Durango
98 Mazda truck