XJS ( X27 ) 1975 - 1996 3.6 4.0 5.3 6.0

My timing chain is jammed

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Old Oct 20, 2025 | 02:45 PM
  #1  
monkfe's Avatar
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From: Toms River NJ USA
Default My timing chain is jammed

So I was replacing my valve stem seals today (4L AJ6)....went as expected and I got them all installed. But sometime during the install, the timing chain dropped one one side and now is jammed between the sprocket and the tensioner. I played with it for sometime and couldn't get it to move. Is there a way to unbolt the bottom of the tensioner (passenger side) to allow it to move a bit? I found one bolt that I thought was it, but no dice. I assume the tensioner if bolted from the front. My manual doesn't seem to show it, at least on the page I was on. Thanks in advance gents.
 
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Old Oct 21, 2025 | 05:23 PM
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From: Pacifica
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I think you might need to loosen up the valve train.
Sorry to be the barer of bad news.
 
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Old Oct 22, 2025 | 07:31 AM
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From: Toms River NJ USA
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Ordered a 1 5/16 socket to turn the crank...hopefully this resolves it. Anyone know if there is a specific TDC mark (like on a Chevy small block) on the crank pulley? I can't say I see anything specific in this regard.
 
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