Thread: IP Timing
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Old 05-08-2018, 10:53 PM
ngoma ngoma is offline
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Join Date: Nov 2009
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Default I like this description better

Again, thanks to v8volvo for this explanation of the preferred method of IP timing:

- ensure cold start device is disengaged and rotate the pump a bit afterwards to let the IP timing parts settle to the "warm" position

- rotate engine until it approaches #1 TDC, using the notch in the IP sprocket as your guide for when you are getting close, but stop before reaching the TDC mark

- using the cam sprocket counterhold tool and the offset wrench, loosen and remove the rear cam sprocket bolt, the sprocket, and the belt

- install the new belt, clean up the mating surface between the rear cam sprocket and the back of the cam to ensure it is dry, apply a light coat of oil to the threads of the rear cam bolt and between the bolt head and washer, and reinstall the rear cam sprocket inside the new belt. Install the bolt until it is finger tight but still allows the sprocket to move freely on the cam.

- bring the engine up to TDC by turning the front of the crankshaft and using the flywheel marker. Make sure you only turn in the direction of engine rotation. If you go past TDC and need to go back, turn the engine back a ways then come back to TDC in the direction of rotation. This is to ensure there's no slack in the drive side of the front timing belt, which would throw your timing setting off.

- install the dial indicator and holder in the IP and zero it. Using the 5199 counterhold tool on the rear cam sprocket, rotate the rear sprockets and belt until the notch on the IP sprocket is on approach for the TDC mark on the IP bracket, and continue to slowly rotate until you reach your desired timing setting plus .02mm or so. Then tighten the rear cam sprocket bolt, ensuring the timing setting and engine position don't move as you tighten it (use the counterhold and wrench together).

- turn the engine two full rotations and confirm your timing setting is correct. If so, finish tightening the rear cam bolt to spec if necessary, remove the dial indicator, reengage the cold start cable, and you're good to go.

Sounds a little complicated to explain but once you have done it this way a couple of times it's quick and painless, much better than wrestling the IP sprocket off, and guarantees correct timing and successful work. Using the method you described would work but is less exact and more difficult, especially if you find you need to make a timing adjustment afterwards. Rotating the IP on its mount to adjust timing is a pain compared to the method given above.

Note -- all of this assumes you are certain before beginning that the cam timing setting is correct, which requires removing the rear cam sprocket (and valve cover) anyway
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1985 744 gle d24t
1985 745 gle d24t
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