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Tic noise caused by broken vacuum pump gear

Old 04-12-2010, 11:37 PM
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Tic noise caused by broken vacuum pump gear

I pulled my vac pump to check drive tang and found that the gear has two broken teeth. KDP has been done it was not that. I found both teeth below the cam gear in the housing.Motor has around 190k. this sounded like a valve that had too much lash. Make sure that tic that you think is a fuel pump really is.Using a long screw driver you could hear the noise the loudest from the vacuum pump.
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Old 04-13-2010, 11:38 AM
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Good you found it before it damaged anything else.
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Old 04-13-2010, 10:56 PM
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Pictures of gear

This happened when we went for a trip last weekend.When we pulled in to or campground I heard it making the noise. We were about 200 miles from home.I had checked the oil be for we left and it was full as usual . I have not had the oil fill open for months. So I know nothing was dropped down there.I have put about 20k on the motor sense I put it in. I can not say if something went thru it before I owned it.

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There are no other marks on any of the gears and the teeth fit back on the gear perfectly

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You can see the shiny spots on the left one it looks like it was moving around I think this tooth was cracked and finally broke off

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Both teeth are complete and have no chips or scar marks
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Old 04-14-2010, 10:58 AM
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Wow..Clean shears. That is an odd failure for sure.
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Old 04-14-2010, 06:45 PM
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If the timing gear wasn't damaged my guess is it must have been a defective gear.
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Old 04-14-2010, 08:33 PM
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Thats what I was thinking and wondering how many more are out there.I am going to adjust timing so I will have the pump gear off so I can look it over good but from turning the motor over a 1/4 turn at a time I did not see anything on any of the gears
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Old 04-14-2010, 09:17 PM
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Thanks for posting
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