Timing rattle


New Member
Apr 2, 2018
I have a 1996 mustang gt with what sounds like a rattle in the timing chain. I’ve changed all the sprockets. Chains. Guides. Arms. Tensioners. Harmonic balancer. Everything. But the noise remains. I’ve had the timing cover off 4 times trying to figure this out. Any ideas? It’s an intermittent noise.
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SN Certified Technician
Aug 14, 2009
Houston Texas
Who made the timing set used?

Which tensioner did you use? The all steel unit with the ratchet or the plastic unit?

Did you inspect all of the roller followers for loose or worn needle bearings?

Did you replace the oil pump? Has the oil pressure been measured?

How many miles on this motor? IMO considering how many times this major job has been done without success you should perhaps consider that the reason for the problems might be low oil pressure. What could CAUSE low oil pressure?
  • debris in the oil pan. When the original timing set failed, did any the broken pieces fall into the oil pan?
  • worn main bearings. Excessive clearance will cause low oil pressure.
  • debris or slug in the upper cam head passage ways.
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5 Year Member
Nov 6, 2016
So no change in the sound after doing all that? Have you tried a mechanics stethoscope to narrow down the area? A sound clip might be helpful if you can get one.