After several attempts over the last 6 months the source of an odd, and heretofore undetermined, "rattle" under the hood of the Escort has finally been found;

It seems that the timing belt has stretched to the limit of the tensioner movement range, and at little beyond even. I have never once seen a timing belt stretch that far, regardless of age or miles. And this belt is only about 3 years and 10K miles old. It is so loose that you can see it flap back and forth on the forward side when it gets revved with no load, vibrating into the into the strip of aluminum casting that forms the forward part of "belt cover", a distance of a solid inch. Engine off, it takes almost no effort to deflect it with a single finger that inch into the "cover". The only other possible thing is a defective tensioner that was built with a reduced movement range, but that seems very unlikely considering it had plenty of range when I last did the timing belt/tensioner change.

So, anyone ever seen a timing belt actually stretch like this? Thoughts? BTY, I have no memory of which brand the belt is.

06HHR
06HHR HalfDork
12/27/17 6:38 p.m.

Could be a defective belt, could be the wrong specification belt with an extra tooth or two.  I actually had that happen when I did an R&R on my son's Rodeo.  Check the part number.

mad_machine
mad_machine GRM+ Memberand MegaDork
12/27/17 7:18 p.m.

yea, as far as I know, stretch on any T-belt is a big no no.

Streetwiseguy
Streetwiseguy UltimaDork
12/27/17 7:28 p.m.

It needs to come apart, but I would look very closely at tensioners and water pumps and everything else run by the belt.  It might be more likely than a stretching belt, unless you checked the lowest cost option from Rock Auto when you bought the parts.

dean1484
dean1484 GRM+ Memberand MegaDork
12/27/17 9:37 p.m.

If the reinforcement in the belt fails it will stretch. However it would be in a specific area of the belt.  If everything else os good I would suspect a mfgs defect. 

Dr. Hess
Dr. Hess MegaDork
12/28/17 6:56 a.m.

I'm going with "something else," not the belt stretching.  Tensioner, etc. went bad.

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