Jehannum Posted October 17, 2011 Share Posted October 17, 2011 I'm helping a friend with the VG in his Z31. He's done a basic NA build, and is running it on the stock EFI. The issue is this: when we set the distributor correctly (rotor pointing to cylinder 1 at TDC), it won't start. When we set it two teeth off, it runs (points roughly to cylinder 5), but according to the timing light, it's about 60° advanced. Now, I'm judging TDC by the marks on the crank. Is it possible that he's put the crank pulley on incorrectly? IIRC, they're keyed, and there's a keyed washer behind it as well. It's (the pulley) torqued correctly, so it shouldn't be wandering, even if the woodruff key is gone. I'm at wit's end with this POS. Any ideas? Quote Link to comment Share on other sites More sharing options...
New 2 z Posted October 17, 2011 Share Posted October 17, 2011 (edited) Okay, what you do is set the engine to TDC where cylinder #1 is on it's compression stroke after this you pull the distributor and set it so it's point at the fuel pressure regulator. That should be the correct timing order, unless he missed a tooth or something on timing belt. EDIT: I forgot to mention make sure the cams are also in alignment with the crank. Edited October 17, 2011 by New 2 z Quote Link to comment Share on other sites More sharing options...
Jehannum Posted October 18, 2011 Author Share Posted October 18, 2011 (edited) Okay, what you do is set the engine to TDC where cylinder #1 is on it's compression stroke after this you pull the distributor and set it so it's point at the fuel pressure regulator. That should be the correct timing order, unless he missed a tooth or something on timing belt. EDIT: I forgot to mention make sure the cams are also in alignment with the crank. I know what TDC is, and we visually verified that the cams are setup right in relation to when the crank says it's at TDC. When the distributor is set the right way, pointing at cylinder 1, it won't fire at all when we try to turn it over. Edited October 18, 2011 by Jehannum Quote Link to comment Share on other sites More sharing options...
BLOZ UP Posted October 18, 2011 Share Posted October 18, 2011 Are you sure you used cylinder #1? since number 2 fires 60 degrees later. Quote Link to comment Share on other sites More sharing options...
Jehannum Posted October 18, 2011 Author Share Posted October 18, 2011 Are you sure you used cylinder #1? since number 2 fires 60 degrees later. Cylinder 1 is the front cylinder on the bank opposite the distributor. Quote Link to comment Share on other sites More sharing options...
New 2 z Posted October 18, 2011 Share Posted October 18, 2011 You're not suppose to point the rotor at cylinder #1. Look very closing at which way it's pointing. Only other way I could think it's off is if someone messed with the CAS trigger by messing with the disk. Quote Link to comment Share on other sites More sharing options...
BLOZ UP Posted October 18, 2011 Share Posted October 18, 2011 Cylinder 1 is the front cylinder on the bank opposite the distributor. Yes, but you need to point it at the number one contact on the distributor (cap). Quote Link to comment Share on other sites More sharing options...
Jehannum Posted October 18, 2011 Author Share Posted October 18, 2011 Heh, guess I'm owned then. That would make some sense, then, since the only way the bastard would run would be 60° off. Quote Link to comment Share on other sites More sharing options...
Jehannum Posted November 16, 2011 Author Share Posted November 16, 2011 Follow up: The distributor was stabbed correctly, based on the marks on the balancer. The marks on the balancer were wrong. He'd taken the balancer apart to paint the pulleys, and did not reassemble it correctly. Since he had the 3 piece balancer, it was possible to get the timing marks misaligned in increments of (you guessed it!) 60 degrees. I sat it next to a known good one, and the keyway to timing mark relationship was off. I corrected it, and how he's running happily at 20 btdc. Quote Link to comment Share on other sites More sharing options...
BLOZ UP Posted November 16, 2011 Share Posted November 16, 2011 Do you have pics of this crank pulley? Never heard of that. Quote Link to comment Share on other sites More sharing options...
Jehannum Posted November 16, 2011 Author Share Posted November 16, 2011 Do you have pics of this crank pulley? Never heard of that. I don't have any pics. The basic arrangement should be the same on any Z31 pulley, though. Of the 3 rows, the rear two are one piece, and the power steering pulley is another (bolted on the front). The bolts go through the PS pulley, through the alt/AC pulley, into the harmonic balancer. The balancer holds the keyway, and the alt/AC pulley holds the timing marks. Since the double row pulley isn't keyed to the balancer in any way, if you take it apart, make sure to reassemble with the timing marks starting right over the top of the keyway (spaced clockwise away from it). I've heard talk of two and three piece pulleys, but I've only ever seen the three piece unit. Car is an '84 NA, and the reference pulley I used came off of (I think) an '86 (two V-belt, one serp for the alternator). Quote Link to comment Share on other sites More sharing options...
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