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I found this neat diesel timing instrument on ebay. Retail was $420.00, but got it for $200.00. Based on the slash marks on my IP housing and the timing belt cover it definitely looked retarded. The screwdriver test in the cold start advance lever indicated it was retarded. Hooked up the DTI...

It's definitely retarded. When warm I pushed in the cold advance lever on the side of the IP with a screwdriver and nothing happened. The engine sound got a little quieter, but it didn't drop in rpm, sputter or stall.. I'll move the marks so they are lined up and go from there. Thanks for your...

Thank you.

One more followup question... If I loosen the IP bolts and move it back to where the hash marks line up and start the truck can anything be damaged? Like I mentioned above the IP is retarded a good 3/16" right now. Thank you, Mark

So with the screwdriver.... If it cuts off it's too advanced, if it doesn't do anything it's retarded and if it shakes a little then smooths back out when you release the plunger it's ok?. My M1123 seems a little rough idling right now...

Been reading here on IP timing.... Checked mine, visually, and it looks like it's retarded, toward passenger side. Seems like alot, looking at it compared to the scribe marks on the housing and IP. Aren't they pretty much lined up with each other. Thanks.