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Engine Specific Info and Questions => IDI Engine => Topic started by: wpinnix on November 25, 2012, 06:48:54 pm

Title: Which way to turn adjustable IP pulley for advance?
Post by: wpinnix on November 25, 2012, 06:48:54 pm

I know this is a silly question....but just wanted to make sure.

I have an adjustable injection pump pulley (1996 AAZ). How to I advance timing?

I have it timed perfectly now (flywheel marker spot on; cam locked and shimmed; timing pin in IP pulley), but want to play with a little advance. I loosen the 3 bolts on the pulley, then turn the center bolt....which way?

Title: Re: Which way to turn adjustable IP pulley for advance?
Post by: JamesT on November 25, 2012, 11:06:57 pm

Looking at the pulley side of the motor, the IP turns clockwise. So to advance, the inner nut (the pump hub) turns clockwise more than the sprocket outer section.

Title: Re: Which way to turn adjustable IP pulley for advance?
Post by: Big Daddy Roth on November 25, 2012, 11:18:02 pm

- take the cam plate out

- take the IP pin out

- insert dial indicator into pump

- roll engine back until dial stops moving down

- adjust the dial so this measurement reads zero

- roll engine forward to TDC

- loosen 3 13mm sprocket bolts, use a 19mm wrench to hold the IP shaft from moving

- make sure engine is still at TDC

- roll pump shaft until dial reads 0.80mm above that zero mark

- tighten 3 13mm bolts, use 19mm to hold IP shaft

- roll engine forward 2 complete revolutions. Never roll engine backwards with dial in pump, unless setting zero mark

- with the crank back at TDC, check to make sure dial still reads 0.80mm