The first time I pulled the chain tensioner on my 617, I didn't realize you had to re-set the piston to its starting position (thanks, Haines).

After a few miles I smelled burning oil and rubber and there was smoke coming out of the oil filler. The excessive pressure and subsequent friction on the tensioner rail was so great that the rubber lining on the rail was melted/burned off clear down to the metal.

new rail--$70
unneeded oil change--$20
New chain--$130 (about time anyways)

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1981 300TD 310k miles
1970 280sel 172k miles
1966 230 Fintail 162k miles

"Where are we going? And why am I in this hand basket?"