questions on timing belt idler pulley(s) - Focus Fanatics
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Old 01-23-2014, 01:51 PM   #1
Pur Pony
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questions on timing belt idler pulley(s)

im getting ready to install a new timing belt on my 02 Zetec and have been looking at ford parts and aftermarket parts....

I noticed that aftermarket timing belt kits come with 1 idler and 2 idler pulleys....

after looking on the ford drawings, it shows only 1 idler pulley... but is has a 47mm and 60mm idler listed under the same part number.....

so just to get straight in my head and make sure i have all the parts needed.....

a zetec ONLY has 1 idler and 1 tension pulley for the timing belt CORRECT?????

I gave my dealer my vin and he is telling me that mine is the 47mm.... is this the most common?

And why do the aftermarket timing kits come with 2 idlers??? Just one of each size just in case????

thank you very much.....

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Old 01-23-2014, 03:40 PM   #2
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You have one idler and one is adjustable

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Old 01-23-2014, 06:15 PM   #3
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Kits with 2 idlers are made to fit many cars.

If you use one, just pick the one that matches your old one.

Making one kit instead of two is easier for the manufacturer & for the parts stores. Half the inventory, and no-one gets the wrong kit.
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Old 01-24-2014, 02:39 AM   #4
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The reason it has two idler pulleys is because the aftermarket kit is designed for a broader market. In other words, it includes most Zetecs including the one's used in Escorts.
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Old 02-28-2014, 09:28 PM   #5
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They used to put an idler down around the crank pulley then later found out they could save thousands on assembly line by leaving it off. The holes are still tapped for it on many motors but you do NOT need to have it. Same belt used just slipped a bit to retime it for the loss in distance. Later kits have only the one pulley, funny thing is they are priced like $30 higher for one less part. I always buy the extra pulley one for cheaper and then extra bearings laying around, I grind them out of the plastic outsides and use them on belt pulleys for other cars. So like saving double the difference. Focus serpentine idler uses it IIRC, if you have the earlier metal pulley you can drill 3 rivets to split, change bearing and then 3 bolts to bolt it back together for new idler at maybe $2 cost. Did that on both mine. I went back and dropped the extra pulley off my Contour as well once I realized it didn't need it.

The plastic eventually cracks and outside of pulley then breaks up from heat, one less pulley means car may well go longer before breaking down.
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