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Pickup Question

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Howard H.

03-29-2003 18:57:35




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Hi All,

I've got a '94 Ford F-250 with a standard transmission.

It has 180,000 miles on it, but is still a great pickup. I pull a 24 foot triple axle trailer with it when I'm picking up farm sale items and have put quite a few miles on it doing just that.

Lately, when I leave it running and out of gear, you can hear sort of a "sewing machine" type of rythmic rattle coming from either the bell housing or the transmission.

I've changed the transmission oil fairly regularly and have never had any metallic flake or dust in it...

Any ideas on what could be causing this rattle?? It sort of comes and goes, but lately has been "coming" more than "going"!

Thanks a lot,
Howard H.

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Fred OH

04-02-2003 10:08:55




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 Re: Pickup Question in reply to Howard H., 03-29-2003 18:57:35  
Been working on a 91 chevy 4wd that had clutch problems and after putting in new throw out bearing, clutch fork and pivot pin and talking to GM trained buddy...he came up with something that I hadn't thought of. He says that the throw out bearing runs all the time on a hydraulic clutch setup...theres no spring to pull it away from the pressure plate. Anybody got any comments on this? I put a screwdriver in the hole behind the clutch fork and pushed and it surely seemed like he was right. The clutch shaft on the front of transmission would have some slop in it if you had it out and shook it sideways...that would tell you if the bearing on it was bad. L8R....Fred OH

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DaveCA

04-03-2003 04:47:40




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 Re: Re: Pickup Question in reply to Fred OH, 04-02-2003 10:08:55  
Fred OH,
I don't know the answer for sure. I've seen them worn out bad. I think they could spin a long time with just grease in them if the pressure was slight. The seal around the hyraukic piston may be designed to return the piston a little. I believe disc brakes use this method.



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Don LC

04-01-2003 09:27:13




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 Re: Pickup Question in reply to Howard H., 03-29-2003 18:57:35  
My guess would be a throw out bearing with a lot of miles on it..... if so it will get worse.....



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KB

03-30-2003 14:25:50




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 Re: Pickup Question in reply to Howard H., 03-29-2003 18:57:35  
I have had throw out bearings fail and they usually made the most noise once the clutch was let out as the bearing spun down. I have also had the input bearing literally fall apart, what a mess. When the input bearing went it would make a noise just like you describe and also would make a similar noise when under heavy load. Easiest way to rule that out would be to pull the inspection cover and see what you find. In my case I found several ball bearings that were split in half attatched to the magnet in the bottom of the gear case. BTW, I still have those ball bearings since nobody believed me until they saw it for themselves. Never saw that type of failure anywhere else. Good Luck.

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Bus Driver

03-30-2003 12:17:25




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 Re: Pickup Question in reply to Howard H., 03-29-2003 18:57:35  
Howard, I think the noise is one of two -or both- bearings in the transmission. When the clutch is depressed with vehicle not in motion, nothing in the transmission turns- no noise. Only when the clutch pedal is depressed does the clutch throwout bearing turn- if all is adjusted properly. Sometimes the retainer in a ball bearing- the cage that spaces the balls in a ball bearing- will wear out and the balls are no longer evenly spaced around the bearing. Such a bearing will be noisy and failure can be sudden and catastrophic. Maybe destroy most of the gears and/or crack the transmission housing. The bearing is likely the front one on the transmission main shaft or the front one on the countershaft-or both. If it was mine, the transmission would be removed and inspected immediately.

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Scott Green

03-30-2003 04:07:56




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 Re: Pickup Question in reply to Howard H., 03-29-2003 18:57:35  
Sounds like throw out bearing to me. With that many miles , it probably needs a clutch , and a throw out bearing. While your in there , I would consider a preasure plate also. My clutch went at just over 180,000 miles. Could not complain. Especialy with the hard work I put the truck through.



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Travis

03-30-2003 04:57:21




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 Re: Re: Pickup Question in reply to Scott Green, 03-30-2003 04:07:56  
Have to agree with Howard H. for the most part. Could even be the pressure plate, the fingers on it may be out a little more or even a spring may be broken allowing one finger to extend out farther thus touching the t-out bearing. I am sure your truck would have a hydraulic clutch and the bearing sits a lot closer to the pressure plate on these. Since the noise goes away when you push the clutch in I almost has to be right there. If this is the first clutch you ever need, you are one of the few people that actually know how to use a clutch carefully--I have a hard time doing this myself.
Have also seen a couple of times when someone installs a new pressure plate, they don't tighten it down evenly and actually warps it--then it may make this noise right from the start, guess I don't think it's a major problem, just kind of annoying.

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Travis

03-30-2003 04:58:53




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 Re: Re: Re: Pickup Question in reply to Travis, 03-30-2003 04:57:21  
Sorry, meant to say I have to agree with Scott Green. DOH! :)



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