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Author Topic: How do these cam gears look?  (Read 6200 times)

ak96ss

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How do these cam gears look?
« Reply #15 on: August 22, 2007, 07:02:01 PM »
I have the cam gears and chain I pulled out of my motor when I redid my timing chain that I'll let you have for $60 shipped to your door. Extreme close up in this thread, but they are really pretty new looking.

I replaced them because I had no idea when/if the timing chain had been done. Once it was all apart (and I already had the new parts in hand) it became apparent that the timing chain and cam gears had been done in the not-too-distant past. I went ahead and put my new parts in, but I still have the gears and chain.

Had I not already had the new parts on hand, I wouldn't have hesitated to reuse the cam gears and chain. The idler and crank sprocket needed to be replaced, but these look good to me...


LMK.
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nomad

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How do these cam gears look?
« Reply #16 on: August 22, 2007, 10:39:14 PM »
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rhogg

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How do these cam gears look?
« Reply #17 on: August 22, 2007, 11:32:05 PM »
Quote
Pointless unless you know the pitch.

Not entirely true.

I have seen plenty of other sprockets that do, and these could at some point during the wear cycle, but at some point they stop hooking and change to a point.

None of my sprockets were hooked.


I didn't know that.  That does bring a better understanding to what "pointy" means.

Please explain what "pitch" means in this usage.  Is there a way to measure chain stretch?  

Thanks for the clarifications.  I've appreciated your other posts and have much tighter upper oil pan bolts thanks to your cautionary tale! :)
« Last Edit: August 22, 2007, 11:34:18 PM by rhogg »
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sheepdog

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How do these cam gears look?
« Reply #18 on: August 23, 2007, 11:26:37 AM »
Quote from: rhogg;32254
I didn't know that.  That does bring a better understanding to what "pointy" means.

Please explain what "pitch" means in this usage.  Is there a way to measure chain stretch?  

Thanks for the clarifications.  I've appreciated your other posts and have much tighter upper oil pan bolts thanks to your cautionary tale! :)

Pitch is the distance between each pin on the chain. As the side plates stretch, this measurement changes. Even if you know the pitch, you still need to know what constitutes too much stretch. Some stretch is normal.
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rhogg

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How do these cam gears look?
« Reply #19 on: August 23, 2007, 06:16:20 PM »
Quote from: sheepdog;32276
Pitch is the distance between each pin on the chain. As the side plates stretch, this measurement changes. Even if you know the pitch, you still need to know what constitutes too much stretch. Some stretch is normal.


Indeed # of links for a given distance is how I have measured stretch in the past. Basically count the pins and know how many add up to a certain fixed distance.  I hadn't heard is called pitch before - Learn somthing every day!

 Thanks
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tjts1

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How do these cam gears look?
« Reply #20 on: August 26, 2007, 06:24:00 PM »
Quote from: nomad;32129
Those cam gears need to be changed along with the chain. They are very worn out. This is how mine look after 140k miles. The top of the gear teeth need to be flat. They get sharp like that after the chain gets loose and starts to wear away the teeth.
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bmwman91

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How do these cam gears look?
« Reply #21 on: August 26, 2007, 07:33:45 PM »
tjts1 is right on.  Sharp teeth mean they are worn out and due for replacement.  The pic he posted is how they SHOULD look.
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Kedge

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How do these cam gears look?
« Reply #22 on: September 03, 2007, 08:13:39 AM »
I would strongly recommend replacing the guides. I bought an engine that had had a new chain and gears fitted but it tuned out the guides had not been replaced.

After 6 months of use on a long drive back home from Le Mans one of the guides started to break up due to them being old a brittle.
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