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Old 01-24-2005, 09:49 AM
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meltedpanda meltedpanda is offline
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Join Date: Mar 2003
Location: Central Ky
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A few points
The bolt must be adjusted while engine is HOT
The bolt serves to "dampen" the movement of the rack in the injector
It is possible even with a new bolt that it will screw in all the way, pumps do wear.
A inline 5 cylider diesel will always have some movement (rock) it is mechanically impossible to completely balance them.
A buddy of mine expalined it this way

Mercedes dealt with this by putting the motor supports at the center of mass and allowing the engine to vibrate. It is quite a bit smoother than the 4 cylinder (OM 616.9xx) but not nearly as smooth as either a straight 6 (M103) or 8 (M117) .

The straight 6 (or 8, 10, 12, etc...) is ideal from a balance standpoint and can be set up so that all primary and secondary shaking and rocking forces sum to 0. A 90 degree 8 can be set up so that each bank has only a primary (at crank speed) rocking couple. These can be set to be 90 degrees out of phase and can then be compensated by eccentric weights on either end of the crankshaft (that's why a V8 has a harmonic balancer, and a straight 6 doesn't.)
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