The missing one from the above pics looks like the one I'm looking at on a 617 I have torn down. Best I can tell, its sole purpose is to hold the timing tab and tach pickup on, but it is the one that does not have a copper washer (#1 in the lower right attached pic). It goes through the front of the block, but does not protrude through to hold any timing components in place or anything else. Was this used for any other equipment on an earlier 617 and perhaps the same block manufacturing process was used for later production dates??? The other one I suspect you are referring to that is in the picture and has the copper washer also has a pin made onto it that allows the lower timing chain guide to pivot(#2 in the attached pic to the lower right). I took pics of each. The SM calls it an "upper bearing bolt with closing plug" and appears to hold #93a - "inner slide rail"
28Crankshaft sprocket53Camshaft sprocket85Tensioning rail89Slide rail93Outer slide rail93aInner slide rail94Chain locking screw98Injection timer98aGuide wheel aChain tensioner
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Thanks,
Mark in NC
"Spark plugs?...We don't need no stinking spark plugs!"
1985 300SD "Der Silberne Schlitten" 420,000 mi
Wish these were diesel:
2003 Ford Club Wagon 130,000 mi
Last edited by mach0415; 05-13-2011 at 04:26 PM.
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