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I just upgraded my IP. The old one had a piece of the turbo come loose go down crank case vent hose. It chewed up the internal IP bolts. I've installed a new IP and am setting the timing using a Gunson pulse pick up and a timing light using the dampner mark and the crank mark. Advanced at 7 degrees at 2000 rpm.
No matter how far to the passengers side I rotate the IP, I'm still too advanced.
I'm wondering with what happened previously if My IP placement is off by a key or so and if so how I would get it back to where I can find the right timing.
I'm no expert so grain of salt and all that. I use the Tech Time timing unit and the advance/offset is 20 degrees at 2000rpm. Rotating the IP towards the passenger will advance the timing and toward the driver side will retard it. Aside from the readings your getting, does the engine/truck run well? I've never used the timing light method so maybe the advance/offset is different, IDK.
Spec is 8.5 BTDC plus or minus 2 degrees. So 6.5 - 10.5 is all good. 7 is what I like to run (lower cylinder pressure, quicker turbo spool, "nice" on things, best for lower end cetane rating around lower 40's and great fuel economy for the average 45 mph speed limits in these parts. If you have better fuel where you live, it will like more advance, I'm sure). That's not too advanced. 6 would be slightly retarded, 11 slightly advanced.
I'd double check and make sure the mark on your harmonic balancer is correctly indicating TDC for cylinder #1.
Remove the 12V from the FSS on your IP. Then remove the #1 injector. You can bump over the starter until your #1 cylinder is at TDC. Use a piece of paper towel in the #1 injector hole. When your #1 cylinder comes up to TDC the paper towel will be forced out of the #1 injector hole.
Here's a quote from OB
Our trucks do not have timing marks like a gas engine generally does. There are two holes on the timing tab above the damper. The one towards the top right is 20* ATDC. The one to the left and lower is TDC. (The middle of the hole is TDC.) So you have no way to know where is 8.5* BTDC. Thus why you need a light with timing advance so you can set the advance to 8.5* (Or 9.5* if you prefer.) so you can line up the mark on the damper with the center of the lower left hand hole. (TDC) The light is compensating 8.5* so you can set the mark at TDC, but you are actually setting to 8.5* BTDC. You also can adjust your timing light to see how many degrees you are from being correctly timed so you have an idea how much to move the pump. The way to think of this is the pump face is a round circle. Thus that circle has 360* like your damper. If you timing is off 5* you are trying to move that circle on the IP 5*. Also be sure to clean out and mark the grooved line on the damper to make it easier to see.
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