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Old 03-02-2012, 04:05 AM   #1
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2001 7.3 motor rattle

I have a 2001 F350 7.3 P.S. that I bought new. It has always been serviced at 3000 miles. The transmisson was replaced at 125,000 miles it now has 185,000 on it. Lately between 2000 to 2200 rpm's the motor sounds like it has a rattle in the bottom end, just before it shifts into drive. No power loss towing or solo. I'm not a diesel mech. I'm hoping it is something simple like a sensor to adjust the timing. I don't hear any rattles any other times, easy driving or hard throttle. I don't have a code reader with me on the road. Anybody heard of this happening? This truck has been pretty trouble free other than the transmisson,being replaced. Also only uses less than a quart of oil to 3000 miles. Thanks for any help!
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Old 03-02-2012, 06:37 AM   #2
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I had the same year and truck, never had an issue other than the oil pan replacement. Check at www.dieselstop.com I always had good luck with the folks there.
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Old 03-04-2012, 05:36 AM   #3
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I would tend to think it is exhaust pipe hitting the firewall or bell housing.
Check the space around the down pipe from turbo down along firewall. Since trans was changed a while back, the pipe might have moved a bit and under some speeds or rpm's the pipe can cause a lot of noise if it hits. I have heard many trucks with this downpipe hitting and it sounds like engine will fail when it hits the firewall. This happens under heavy pull because the motor mounts let it rock left or right
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Old 03-06-2012, 12:04 AM   #4
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Thanks for the reply, I will check the pipe,won't be able to until end of week. Let you know what I find.
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Old 03-06-2012, 05:11 AM   #5
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My bet is the pipe is just touching at high rpm and under load. Look real good where it comes down at firewall and at the bell housing. As I said, when it does come in touch with something it makes a lot of noise that you could mistake it for engine noise and after it shifts gears, rpm drops and goes away
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Old 03-15-2012, 10:02 PM   #6
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My 99 had a rattle, that almost sounded like someone shaking a chain around and it did it just before shifting into drive. I have a friend who is a transmission guru and he said it was the torque converter. The issue was coming from a lack of fluid pressure. I was also told by him, to just drive the truck and have fun. He was not too concerned about it and said that a new TC was in my future, whenever the transmission was ready for a rebuild. Since a new TC would be part of a tranny rebuild anyway, I just ignore the sound anymore.

BTW: The noise started 15,000 miles ago and there has been no loss of performance. The truck still shifts perfectly.
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Old 03-16-2012, 03:36 PM   #7
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Without hearing it I can not be sure. .I have had that exhaust pipe issue on a car once.

I've also had pre-ignition "Pinging" which sounds a lot like a rattle.
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Old 03-17-2012, 07:29 PM   #8
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Thanks for all the replies. I have been busy and haven't had a chance to look at the truck yet. Today it is raining, so won't be today. Will post if I find something. Thanks
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Old 05-21-2012, 12:54 AM   #9
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On my '02 PSD... The power elbow (down pipe) off the turbo cracked right at the weld on the flange. When that happened it was a going excuse the install a Banks power elbow and full exhaust. Pretty straight forward to do. Symptoms were very similar.

Good luck. Keep us posted.

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Old 05-21-2012, 08:10 AM   #10
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An additional area to check is the rear transmission support brackets. See these loose and can cuase some interesting rattles and pops.

ken
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