Valve clearance & sodium valves


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Posted by D Sherman [72.47.9.228] on Sunday, November 06, 2011 at 20:58:32 :

I was looking through my manual and found what looks like a definitive source -- an original "Chrysler 6-cylinder industrial engines" operator's manual published by Chrysler. In the intro it says it applies to "Models IND 30, 31, 32 and 33, and the Military standardized engines Models IND 908A and 931.

Here are the interesting parts about valves from page 12:

"EXHAUST VALVES: One of the outstanding features of Chrysler 6-Cylinder Industrial Engines is sodium-cooled exhaust valves which are available as optional equipment on the 32 and 33 models. They are specified for heavy duty operation (Figure 9)The sodium-cooled valve stem is made hollow and then partially filled with pure metallic sodium, which liquefies at 207 deg F. In liquid form, the sodium moves up and down with the motion of the valve in operation and helps to transfer heat from the valve head to the engine cooling system. Engines equipped with sodium-cooled valves can be identified by a plate (Figure 10) attached to the right side of the engine near the engine identification name plate."

Figure 9 shows the different appearances of the two standard and sodium-filled valve and the different valve guides used with each. Figure to shows a data plate that tells how to adjust the valve clearance for sodium-filled valves.

The next paragraph reads:

"ADJUSTING VALVE TAPPETS. Valve tappets should be adjusted with engine running at normal operating temperature. The valve tappet screws are of the self-locking type, without lock nuts. Adjust standard valve tappets to: intake .015 inch (engine hot or cold), exhaust .015 inch (engine cold). Adjust sodium-cooled exhaust valve tappets to: .018 inch (engine hot), .020 inch (engine cold)."

This is a little confusing because first it says to adjust with the engine warmed up and running, and then it gives the exhaust valve clearance only for a cold engine. What I think is interesting is that in the PIF we have .014 for exhaust and .010 for intake. That's considerable tighter on the intake than this Chrysler manual recommends.

Another thing in the manual that I thought was interesting was that they show a version with a front end that has timing gears rather than a timing chain, and a provision for mounting a gear-driven accessory that would drive off of the camshaft gear. Presumably that model would have a backwards camshaft too.



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