Timing chain help,

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BLue n white R1
Posts: 50
Joined: Tue Jul 01, 2003 2:13 am

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I was looking for some information on setting the Timing chain correctley, I know that the crank should be set to TDC, and the cams should have the marks at 0 degrees as well, but how do I set the Crank angle sensor?


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SpeedRacer1
Posts: 3144
Joined: Fri Jul 26, 2002 7:44 pm
Car: 1990 240SX, G35

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SR20DET S13/S14 Timing:Camshafts/sprockets should not be set at 0 degrees.The intake will be set at 10'o clock, the exhaust will be set at 12'o clock, when the crank sprocket is at TDC. TDC is the second mark from the left out of the little notches. However look in the piston to make sure its really at the top of the stroke and not the bottom. Also do not remover the sprockets from the chain before turning the pistons or you will most likely cause damage to the pistons and or valves.

CAS setting: You will notice that there are three dots on the CAS gear. The outer ones are mating marks, the yellow middle one is the pilot mark. Match the mating mark on the outside (away from the engine) with the yellow mark so that they are aligned. Now (while at TDC) slide the CAS back in, you will see the gear turn. When the CAS has been slid all the way in, the two outer mating marks will be aligned and the yellow paint mark will have turned in, towards the engine. Finally bolt the CAS back on the engine with the two 13mm(14mm?) bolts, do not torque tightly. Put the rest of the engine together. Start the car, it may run bad, but rotate the CAS back and forth until you find the proper ignition timing. Then proceed to torque the bolts to 9-12 ftlbs.

Picture of the proper camshaft setting at TDC http://sr20.hybrids.jp/install...3.jpgS14 SR20DET FSM http://www.zilvia.net/faqs/faqs.asp Go to pages 55-68 for the Nissan instructions.This website has good instructions, follow their suggestions on camshaft sprocket retention too, http://sr20.hybrids.jp/install....html

BLue n white R1
Posts: 50
Joined: Tue Jul 01, 2003 2:13 am

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awseome thats, just what I was looking for, Ive done many non CDI systems, so i figured their was a way.

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SpeedRacer1
Posts: 3144
Joined: Fri Jul 26, 2002 7:44 pm
Car: 1990 240SX, G35

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BTW, there are 20 rollers between the mating marks on the cam sprockets (as seen in the sr20hybrids photo). There are 56 rollers between the intake cam mating mark and the crank sprocket at the bottom. There are 48 rollers between the crank mark and the exhaust cam mark. The key way on the crank will be facing straight up at 12'o clock. The timing chain has 3 links, two are painted silver and mate with the cam sprockets, the other mark is gold and mates to the crank sprocket.


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