7.3 Death Vibration
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Elder User
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From: Guymon
7.3 Death Vibration
While I was at work yesterday, I moved one of the trucks that a guy stuck in a fresh rebuild from jasper which included the injection pump and injectors already installed from the factory.
Well, Started that thing and I dont' think I have ever been in a truck that has ever vibrated that much. I could feel it the seat, steeringwheel, the doors, floor and metal dash were making so much noise you can't think.. Not only that, the engine itself is the loudest I had ever herd. Not to mention its in a large completly metal box truck that has 500K+ thats beat to hell.. I know these are loud engines but yall sould hear this baby!!! It feels like someone welded a very large weight on one side of the flywheel or something cause you can sit there and listen to your teeth rattle. I have heard many of these engines, but nothing like this.
Any Ideas???
Well, Started that thing and I dont' think I have ever been in a truck that has ever vibrated that much. I could feel it the seat, steeringwheel, the doors, floor and metal dash were making so much noise you can't think.. Not only that, the engine itself is the loudest I had ever herd. Not to mention its in a large completly metal box truck that has 500K+ thats beat to hell.. I know these are loud engines but yall sould hear this baby!!! It feels like someone welded a very large weight on one side of the flywheel or something cause you can sit there and listen to your teeth rattle. I have heard many of these engines, but nothing like this.
Any Ideas???
Posting Guru
Joined: Mar 2005
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From: KY
Make sure the trans components are fastened up good. I have seen torque converters fastened up wrong and bust a flex plate instantly. Thats is the only thing that could cause a problem where the installer messed up.
I did see a 6.5 replaced one time and the new motor did the same thing and it ended up being a cat. converter stopped up. That was a bad call. Wasn't me though. I did make a bad call on Detroit one time. It happens.
I did see a 6.5 replaced one time and the new motor did the same thing and it ended up being a cat. converter stopped up. That was a bad call. Wasn't me though. I did make a bad call on Detroit one time. It happens.
Post Fiend
Joined: Nov 2003
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From: Nutter Fort, WV
I had a reman that did that.
9700 miles later the crankshaft was a two piece version.
As far as we can tell, the crank was cracked, they used it anyway or did not catch it.
The engine was extremely loud, almost hurt your ears with a high pitched rattle when it was first started.
The vibration was not to bad at first, but it got worse as I drove it.
Right before it broke, 2000 RPM was out of the question the vibration was so bad.
9700 miles later the crankshaft was a two piece version.
As far as we can tell, the crank was cracked, they used it anyway or did not catch it.
The engine was extremely loud, almost hurt your ears with a high pitched rattle when it was first started.
The vibration was not to bad at first, but it got worse as I drove it.
Right before it broke, 2000 RPM was out of the question the vibration was so bad.
Post Fiend
Joined: Oct 2007
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From: Faibanks Ak.
Two more things come to mind a friend of mine bought a nice 87 idi because it felt like the motor was going to shake out of the truck. Installed a new fan clutch and drove it home.
Another thing and I dont know how the 6.9s are set up but somebody on here will know is the bellhousing adapter may be off a little doesn't take much we use dial indicators to install them on cummins. could it have been missing a dowell pin.
Another thing and I dont know how the 6.9s are set up but somebody on here will know is the bellhousing adapter may be off a little doesn't take much we use dial indicators to install them on cummins. could it have been missing a dowell pin.
Postmaster
Joined: Apr 2008
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One injector loose in the head will cause a "misfire" that is good to shake the whole truck, I went through that in September, as luck (or the lack thereof) has it it happened 100 miles from home with a car to tow too. Didn't quite catch it then tho, I thought about it for a minute but then I forgot about it cause the darn race was going steady downhill, ended up driving it home like that through some nasty rainstorm and still got 15mpg, then later that week I remembered about the loose injector thought and checked them and sure enough #5 was loose - pulled it, replaced o-ring, tightened it down, no more compression leaks, engine runs nice smooth (well, as smooth as one of these can run). This actually happened to me 3 times, on injectors #4, 5, and 6, in that order, #6 tho I could not remove cause it felt like I'm fighting threadlock, so I just tightened it down and she was good.
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From: Guymon
Well, I don't think its the bell housing since it just uses like 12 or so bolts (never counted) for the spicer manual tranny. Otherwise, That would be a great one to check. It feels more like the crank is bent/broke or something but its still running. I know it shook real bad before they installed the tranny when they put the new engine in and test fired it.
Also, The injector is something to consider but I don't think it would make it shake as bad as this, and loud rattleing, hammering, I honestly don't know how that thing is still running. If you have ever driven a full aluminum metal box truck, yall know how loud they are, this thing is like a paint shaker with tin cans tied to it.
Also, The injector is something to consider but I don't think it would make it shake as bad as this, and loud rattleing, hammering, I honestly don't know how that thing is still running. If you have ever driven a full aluminum metal box truck, yall know how loud they are, this thing is like a paint shaker with tin cans tied to it.
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Elder User
Joined: Jan 2008
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From: Guymon
HEY DAVE S, Was your engine rebuild a Jasper that broke. We have had bad luck with the jasper rebuilds. I hear they are a great company but Im thinking not so great with the 7.3, 6.9 IDI.
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Joined: May 2004
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From: Danville, Pa
If the timing marks are lined up on the IP, then it's too advanced by 1-2 teeth alignment with the cam gear. (if louder than a powerstroke significantly, 2 teeth.) It will also shake progressively worse as timing is retarded 2 degrees or more, but thats easily diagnosed by hard/slow starting, pugnent diesel exaust smell, blue exaust smoke, and breakup above 1500~2000 RPM's.
Post Fiend
Joined: Nov 2003
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From: Nutter Fort, WV
The company name was Reviva, which used to be Dealer Diesel five or so years ago.
Jasper engines at one time were great engines.
Today I know several shops here that will not even look at them.
Funny thing is those same shops used to use and install Jasper engines 10 years ago.
Jasper engines at one time were great engines.
Today I know several shops here that will not even look at them.
Funny thing is those same shops used to use and install Jasper engines 10 years ago.
Postmaster
Joined: Mar 2008
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From: Sweet Home, OR
Two more things come to mind a friend of mine bought a nice 87 idi because it felt like the motor was going to shake out of the truck. Installed a new fan clutch and drove it home.
Another thing and I dont know how the 6.9s are set up but somebody on here will know is the bellhousing adapter may be off a little doesn't take much we use dial indicators to install them on cummins. could it have been missing a dowell pin.
Another thing and I dont know how the 6.9s are set up but somebody on here will know is the bellhousing adapter may be off a little doesn't take much we use dial indicators to install them on cummins. could it have been missing a dowell pin.
Also if the motor is "ground-out" where the motor or trans. is touching some part of the body or chassis where it's not supposed to it'll shake your teeth out. I saw a wrecked Dodge-Cummins that way and you couldn't read the gauges or look in the mirrors.
The body shop supposedly fixed it. The owner brought it by for me to look at it and I couldn't believe they let it out like that. They said they thought it was "normal" for diesels to shake like that.
IDIOTS!!!!!
Laughing Gas
Joined: Mar 2006
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From: Fitzpatrick Alabama
My dad had an old UD truck, he had two of them. The first one he bought lasted 400,000 and was still running when it left here, he liked it so much he bought another one a little newer, by the time he got home it was vibrating bad enough to shake your teeth out, took it somewhere where they pulled the oil pan and the crankshaft was in two pieces, but some kind of way it was still running, or at least thats what they said, had to have a used engine put in.