Date registered: May 2006
Vehicle: 93 SL500, 95 SL320, 96 S320, 98 S500, 2002 E320 4Matic Wagon & A little 91 5.0 FORD Mustang
Location: Sacramento, California & El Dorado Hills, California, USA
Mentioned: 37 Post(s)
Quoted: 1225 Post(s)
A couple of things...
The "MOT" Valve(Purge Valve) is known to tick loud. The valve sends engine vacuum to the fuel tank. Follow the large engine vacuum lines. One goes to the brake booster and the other to the MOT valve..
Remember, these M119 have bypass oilers at the top of the heads, and your oilers are metal(+93/+94 M119's have plastic oilers that blow the end-caps, and make the tick), BUT........ They yours have rubber orings. I would inspect the oiler orings for how soft they are, but I bet they are brittle-hard. I'd replace the orings first, and while you are there you will see any CAM lobe's with excessive wear..