Re: detroit specs

Posted by NC Wayne on May 12, 2006 at 21:57:57 from (205.188.117.14):

In Reply to: detroit specs posted by John Starnes on May 12, 2006 at 09:03:55:

I've got a Detroit Field Service data book and unless I'm reading it wrong the settings on a 2-71 are the same as any other 71 series engine. It gives 2-71 specs individually where they are different but in the case of the valve lash it doesn't make a distinction. That said if your setting them cold it's .012 for two valve heads and .016 for 4 valve heads. I know a 2-71 is, for the most part, a creature unto itself in the Detroit family so think about it like this. If your facing the front of the engine and it's rotating CCW then the tabs would go to your right, if it's rotating CW then they'd go to the your left. Basically when the engine is on either stroke it's pushing on the bearing and trying to make it spin. The majority of the force is gonna be on the top half on the compression and power strokes. So you want the rotational force acting on the bearing at that time to be in the same direction as the face of the tab, not the taper of the tab. So, for example, if the crank is rotation CCW, facing the front of the engine, then the greatest force is, again, on the top half of the bearing. However, while the crank itself is turning CCW the rod journal is actually rotating CW in the rod bearing trying to spin it in a CW motion. In this case you need the tab on the right side so the CW motion on the bearing is transmitted to the face and not the taper of the tab. Hope this explination helps and doesen't confuse you. Good luck.

Replies:

• Re: detroit specs John Starnes 09:20:28 05/13/06 (0)

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