halp! can't get cam sprockets + chain back on - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

Neejay · 03-29-2008, 02:46 PM

I relieved the upper-left tensioner, but I can't get the cam sprockets back on the cams + timing chain. I can get the sprockets on, but then the chain seems too small.

Question though, are the sprockets different for intake and exhaust cams? I'm doing the 248/232 cam swap, but I just realized that I was trying to use my intake sprocket on the 248 exhaust cam.

I've tried doing one at a time, and both at the same time (slightly working them on).

What am I missing?

KA-T_240 · 04-03-2008, 12:28 AM

both sprokets are the same. Do them one at a time, starting with the exhaust cam.

You may have to have a wrench and adjust the cam a bit. Its a tight fit. Especailly if you do not put the stuff on in just the right order.

Neejay · 04-03-2008, 06:22 AM

Done, kinda. I just didn't update the post/reply back.

You're right: I had to put the intake sprocket on first + chain, then work the other sprocket on. It was a tight fit, but it was slightly off (like it was a machining difference - I just used the end of a wrench + hammer, lightly).

Now my timings off and Im going to have to have it towed to this local shop.

I've already set engine TDC + set distributor TDC + had my friend crank my engine while I turn the distributor left and right. No dice.

louisdaboois · 04-03-2008, 06:27 AM

i suppose for future reference, I found it easier to set the cams where they are supposed to be at TDC loosened the cam caps a little just to get them to slope down to get the sprockets on. Then i tightened the sprockets just hand tight, then slowly torqued the cam caps to spec and finished up with the sprockets.

03-29-2008, 02:46 PM	#1
Neejay Post Whore! Join Date: Jan 2004 Location: lol Age: 35 Posts: 2,586 Trader Rating: (2) Rides Gallery: Neejay Feedback Score: 2 reviews	halp! can't get cam sprockets + chain back on I relieved the upper-left tensioner, but I can't get the cam sprockets back on the cams + timing chain. I can get the sprockets on, but then the chain seems too small. Question though, are the sprockets different for intake and exhaust cams? I'm doing the 248/232 cam swap, but I just realized that I was trying to use my intake sprocket on the 248 exhaust cam. I've tried doing one at a time, and both at the same time (slightly working them on). What am I missing?

04-03-2008, 12:28 AM	#2
KA-T_240 Nissanaholic! Join Date: Sep 2005 Location: Moorhead, MN Age: 34 Posts: 1,788 Trader Rating: (0) Feedback Score: 0 reviews	both sprokets are the same. Do them one at a time, starting with the exhaust cam. You may have to have a wrench and adjust the cam a bit. Its a tight fit. Especailly if you do not put the stuff on in just the right order. __________________

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04-03-2008, 06:22 AM	#3
Neejay Post Whore! Join Date: Jan 2004 Location: lol Age: 35 Posts: 2,586 Trader Rating: (2) Rides Gallery: Neejay Feedback Score: 2 reviews	Done, kinda. I just didn't update the post/reply back. You're right: I had to put the intake sprocket on first + chain, then work the other sprocket on. It was a tight fit, but it was slightly off (like it was a machining difference - I just used the end of a wrench + hammer, lightly). Now my timings off and Im going to have to have it towed to this local shop. I've already set engine TDC + set distributor TDC + had my friend crank my engine while I turn the distributor left and right. No dice.

04-03-2008, 06:27 AM	#4
louisdaboois Zilvia Addict Join Date: Dec 2006 Location: LA, CA Age: 32 Posts: 851 Trader Rating: (28) Feedback Score: 28 reviews	i suppose for future reference, I found it easier to set the cams where they are supposed to be at TDC loosened the cam caps a little just to get them to slope down to get the sprockets on. Then i tightened the sprockets just hand tight, then slowly torqued the cam caps to spec and finished up with the sprockets.