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Urgent Help Needed: Misfires after VCT replacement & Timing chain refresh

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Urgent Help Needed: Misfires after VCT replacement & Timing chain refresh

  #11  
Old 11-07-2018, 10:08 PM
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Set it once and done.
 
  #12  
Old 11-07-2018, 10:46 PM
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I dont think I could do that for the very reason this thread exists. Its contrary to every engine I set timing on, odd!
 
  #13  
Old 11-08-2018, 04:52 PM
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Originally Posted by ndinsmore View Post
Follow up question.

I noticed that after I had tightened down the sprocket bolts on Bank 1 then removed the "special tool" that the secondary chain would go a little slack. Now when it was in the tool the chain was nice and tight, but the second i would loosen that tool, it looked like the exhast cam would turn clockwise just a little. Now I had noted something like that when I took it apart, so I didn't think that was an big issue. but does anyone know if that sound right?
That would appear to be right. I had one of my cam covers off a couple of weeks ago to check out the VCT solenoid. I noticed that, though the secondary chain was properly tensioned, it was slack at the top between the two cam cogs. I had quite forgotten about this slack and am sure it was there after I rebuilt both my heads.

On the point of setting the timing, are you aware that there is a shim (sold by Dingocrft here in the UK) part N 303-530-04 that sits between the the cam locking tool and the two flats. I had one for my rebuild, it takes up that small gap left between the flats and the tool and locks things up better. https://www.dingocroft.co.uk/cgi-bin...303_2d530_2d04

 
  #14  
Old 11-08-2018, 07:31 PM
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Yeah, the AST tool comes with it. The cheap tool I had would have needed 4 or 5 of those.

https://asttool.com/detail_page.php?...&from_search=y
 
  #15  
Old 11-09-2018, 07:02 AM
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So when I got the covers off the intake sprocket was off by 15-20 degrees. I have followed the topix shop manual exactly, used the crappy tool, but nailed the torques. I thought I had checked this before I closed up the engine. Does anyone have any thoughts about how the timing could have gotten this bad without me just screwing up?
 
  #16  
Old 11-09-2018, 08:28 AM
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The chain could have had slop in it. When you fit it onto the sprockets all the slack has to be off the chain on the guide side, so when released the tensioner takes it all.

Thats just a guess, but the secondary chain should have kept it all in place. Did you have someone holding the cam with the cam tool while torqueing?

I have a write up done for a Jag with pictures, torque settings are different, but it helps as a guide.

I will post once Im at the shop.
 
  #17  
Old 11-09-2018, 11:27 AM
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