Anybody know what this is...sent out motor, and this came back in a separate box

Thanks

I believe that is the heat riser stop that bolts to the oil filter adapter. It should have a small piece of rubber that slides over the end.

Thanks for the response. I believe you to be correct. Found in a box of leftovers when engine was rebuilt. If this part is left off will the heat riser oscillate like a metallic percussion system, or could engine builder possibly have left it off intentionally? To put on, just remove 2 bolts off of filter housing right? Have to check if rubber part is available or may have to make my own out of vacuum hose

Thanks

I believe if left off the butterfly on the shaft can go over center. Yea I would just make my own rubber piece and set the wide open spot before you put the pipe on to get it right. Make sure you crack the third bolt on the filter adapter loose also or you will take a chance on warping it.

Thanks Barnbird. I looked in service manual for torque, is this the right one for the adapter bolts to block: "Oil filter pad cover-30lbs" on 6a-16. That seems like a too much torque. I remember from my "yute" that these can be touchy.

That sounds right for that size bolt. Make sure you do it in three steps of 10 ft. lbs. each around the clock. Most of the time when people crack aluminum parts like this tightening them, they just slam each bolt to full tight one at a time.

Just to clarify this for future readers, I actually went out and looked at my car instead of trusting my memory and this piece is for the full closed position not full open as I previously stated.