Date registered: Nov 2008
Vehicle: 1981 300TD 310k--1966 230 165k--1970 280se 172k
Location: Ohio City, Ohio
Mentioned: 1 Post(s)
Quoted: 33 Post(s)
If you are still convinced that it's valve train noise, you can do a cursory check of the camshaft. It sounded more like a light pounding than a ticking, but I could be wrong.
Check each lobe for excessive wear. When they wear through the case hardening they lose their sheen.
Mark and wire the chain to the camshaft sprocket, remove the bolt holding the sprocket on, and you should be able to pull it forward enough to get it off the shaft. Stuff the chain cavity with rags and watch you don't lose the key or washer.
Remove the followers and turn the camshaft by hand. There should be some resistance but be turn-able.
Make sure the cam tower bolts are tightened to specification.
Check the rotational resistance of the camshaft again. Put the sprocket back on.
Having gone this far, you might as well check the springs/valve guides and replace the seals. Button it back up and see what gives.
1981 300TD--310k miles
1970 280sel--172k miles
1966 230--162k miles
Last edited by carpenterman; 09-20-2013 at 06:37 PM.