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Author Topic: Inspection of the Contitech belt kit reveals...  (Read 4647 times)

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Webby the Bear

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Inspection of the Contitech belt kit reveals...
« on: 09 November 2015, 10:59:46 »

As you may know I, with the help of TB, replaced my timing belt kit yesterday from a Contitech with a Gates kit. The Contitech kit was 2 years old and had only done 10,000 miles.

The howling I sometimes got has gone.

Belt looks a bit worn to me but no obvious signs of imminent failure. in my opinion.

Tensioner and upper idler have no play or slop when you spin it but they do have some interesting ''scoring'' marks on the parts that contact the belt. Normal for two years of use? No idea.

HOWEVER, the lower idler has lots of forward and back play in the bearing. It also appears to have small particles of belt material baked on to it.

I assume this isn't normal.

If needed, I will post a video of the play in it.

So. Conclusion. A duff idler. Unless anyone confirms this play is normal.  :y
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Kevin Wood

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Re: Inspection of the Contitech belt kit reveals...
« Reply #1 on: 09 November 2015, 11:37:47 »

I've never found play in an idler bearing. A bullet dodged there. :y
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Marks DTM Calib

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Re: Inspection of the Contitech belt kit reveals...
« Reply #2 on: 09 November 2015, 11:49:43 »

You will get axial play in a bearing of that type.

Just remember that the Contitech idlers and tensioner are exactly the same parts, from the same factory, as the Gates ones  :y
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Webby the Bear

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Re: Inspection of the Contitech belt kit reveals...
« Reply #3 on: 09 November 2015, 11:50:12 »

I've never found play in an idler bearing. A bullet dodged there. :y

Thanks Kev,

Yeah that makes sense cos the upper idler is still solid!  :y
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Webby the Bear

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Re: Inspection of the Contitech belt kit reveals...
« Reply #4 on: 09 November 2015, 11:51:35 »

You will get axial play in a bearing of that type.

Just remember that the Contitech idlers and tensioner are exactly the same parts, from the same factory, as the Gates ones  :y

So how come the other one is solid still with noplay?
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Marks DTM Calib

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Re: Inspection of the Contitech belt kit reveals...
« Reply #5 on: 09 November 2015, 12:00:50 »

You understand what the axial play is?  :y
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05omegav6

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Re: Inspection of the Contitech belt kit reveals...
« Reply #6 on: 09 November 2015, 13:10:09 »

You understand what the axial play is?  :y
Rotational play caused by wear along the shaft by the loaded side of the bearing... You'll likely find the shaft or bearing internal bore are out of round ;)
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Webby the Bear

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Re: Inspection of the Contitech belt kit reveals...
« Reply #7 on: 09 November 2015, 14:46:43 »

I've no idea what axial play is.  :)

But I know I've got two idlers that look identical. They both feel the same when I spin them in my hand (perhaps the one with the play feels as though it lacks the same resistance as the one with no play but near enough the same) but one idler has in and out play, the other doesn't. That has to be a fault.... if not, why not? :)

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Marks DTM Calib

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Re: Inspection of the Contitech belt kit reveals...
« Reply #8 on: 09 November 2015, 14:59:08 »

Always worthy of a picture:



Now these bearings from memory are a twin race and hence you can see axial play but no radial play and axial play is not really a problem.  :y

I recall they are a standard bearing type (e.g. 0603 etc) so might be worth getting the number to understand the construction better.
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Webby the Bear

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Re: Inspection of the Contitech belt kit reveals...
« Reply #9 on: 09 November 2015, 15:03:14 »

Thanks for the diagram. So, yes, it appears axial play is what we are looking at.

But why does the other one not have this play?
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Webby the Bear

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Re: Inspection of the Contitech belt kit reveals...
« Reply #10 on: 09 November 2015, 15:04:13 »

....combined with a loud clicking noise I might add  :)
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Marks DTM Calib

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Re: Inspection of the Contitech belt kit reveals...
« Reply #11 on: 09 November 2015, 15:31:44 »

Thanks for the diagram. So, yes, it appears axial play is what we are looking at.

But why does the other one not have this play?

It may be a different bearing type used or down to manufacturing tolerances (if you find the bearing number we can look).

The clicking noise however is a different matter (and new info)  :y
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Webby the Bear

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Re: Inspection of the Contitech belt kit reveals...
« Reply #12 on: 09 November 2015, 15:45:32 »

Thanks for the diagram. So, yes, it appears axial play is what we are looking at.

But why does the other one not have this play?

It may be a different bearing type used or down to manufacturing tolerances (if you find the bearing number we can look).

The clicking noise however is a different matter (and new info)  :y

ok thanks mark. ill go and get the things out the boot tonight and post up.

yeahwhen you push the bearing in and out (in an axial way lol) theres a definite clunk aswell. I may even do a video  ;D
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Webby the Bear

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Re: Inspection of the Contitech belt kit reveals...
« Reply #13 on: 09 November 2015, 15:46:24 »

ps I presume bearing numbers will be written on or stamped on the old part?
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Marks DTM Calib

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Re: Inspection of the Contitech belt kit reveals...
« Reply #14 on: 09 November 2015, 15:55:05 »

Normally engraved on the edge of the outer race.

Every single one I have seen were French SKF parts
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