Motor mounts
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Elder User
Joined: Aug 2009
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Thank you sir, let's assume I know nothing, would a miss balanced engine last this long? I honestly chalked it up to worn out motor mounts and a decent cam. It seems to idle smoother during driving, when I get on the fast pedal and let off, I can watch the 4wd and shifter snapping.
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Elder User
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T19 manual, has shook all along, best way to describe it is like a cam lope, almost like too low an idle speed sounding like that's why I always thought mounts, no real miss, smooths out if I raise idle rpm.
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From: Denver Metro Area, CO
But you said something about a "low" idle speed of 900 RPM, I consider that pretty fast for a stick shift... unless there's a cam... will the cam allow it to get down to 500 or so for testing purposes?
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If I can figure out a way, and weather permits, I'd like to post a video so everyone can see what kind of shake it has. now I'm a bit concerned, perhaps i don't have experience, but are they not supposed to shake at all? I know it's no diesel, but I thought some would be expected?
pedant
Joined: Jan 2008
Posts: 23,576
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From: EXTREME southwest CT
... if this engine was from a car it is 28 Oz. out of balance with a truck flywheel.
THAT will cause a lot of shaking.
Look on the block behind the starter for a casting number.
If it is not D9TE you've found the problem.
You should also check the crank spacer behind the harmonic damper.
If it is just a round sleeve that the front main seal rides on, it's not right for a manual.
ETA: unless someone put the wrong spacer on too...
If the crank is internal balance, then you need to remove that flywheel and bring it to the machine shop or order a zero balance flywheel and spacer from some other source.
The shaking will destroy the main bearings if you don't.
THAT will cause a lot of shaking.
Look on the block behind the starter for a casting number.
If it is not D9TE you've found the problem.
You should also check the crank spacer behind the harmonic damper.
If it is just a round sleeve that the front main seal rides on, it's not right for a manual.
ETA: unless someone put the wrong spacer on too...
If the crank is internal balance, then you need to remove that flywheel and bring it to the machine shop or order a zero balance flywheel and spacer from some other source.
The shaking will destroy the main bearings if you don't.
Laughing Gas
Joined: Apr 2013
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I replaced my motor mounts when I noticed excessive motor movement when dropping it into reverse. The new ones were hard rubber.
My mostly stock 460 (automatic) idles about 850 in park and 650 in gear and I figure the tune is about right when the radio and CD antennas don't shake when the motor is running.
Over the years I'd say most of my roughness at idle has been ignition related, bad wires in particular, followed closely by vacuum leaks.
Vacuum leaks will tend to smooth out at higher RPM as the volume of air leaking into the intake becomes a much smaller percentage relative to all the air and fuel entering through the carb.
If you have an EGR, and its hanging open, that's a big vacuum leak that will certainly cause the shakes at idle.
My mostly stock 460 (automatic) idles about 850 in park and 650 in gear and I figure the tune is about right when the radio and CD antennas don't shake when the motor is running.
Over the years I'd say most of my roughness at idle has been ignition related, bad wires in particular, followed closely by vacuum leaks.
Vacuum leaks will tend to smooth out at higher RPM as the volume of air leaking into the intake becomes a much smaller percentage relative to all the air and fuel entering through the carb.
If you have an EGR, and its hanging open, that's a big vacuum leak that will certainly cause the shakes at idle.
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Elder User
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I will double check the stamping number on the block, as well as the number on the dampener. the spacer is the pendulum style, not a straight sleeve, it has a counterweight on it. I do not have egr, and no known vacuum leaks. Thanks everyone so far!
pedant
Joined: Jan 2008
Posts: 23,576
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From: EXTREME southwest CT
You have added external balance components to an internally balanced engine.
Find a spacer sleeve for the front and have the flywheel zero balanced.
The vibration should be gone.
Ideally you would have the entire rotating assembly balanced, but it's a little late for that.
While it is possible that the PO put an external balance crank in an internal balance block it is not likely that that happened.
Ford Parts Specialist
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From: Simi Valley, CA
D1VE-6015-A2B = Internal balance: 1971/73 Passenger Car 429; 1971/78 Passenger Car 460; 1973/78 F100/350; 1975/78 Econoline; Some 1979 F150/350 & Econoline 460.
D9TE-6015-AB = External balance: Some 1979 F150/350 & Econoline 460; 1980 and later Econoline 460; 1983 and later F250/350.
Mid-year 1979, FoMoCo changed the 460 engine, it's externally balanced, has a weighted crank spacer.
There are no before/from serial numbers or production dates, the block casting number must be known to get the correct harmonic balancer and flywheel.
Sorry, that's incorrect.
D0OZ-6316-B .. 1970/73 429/460 Harmonic Balancer / D4VZ-6316-A .. 1974/79 460 Harmonic Balancer-Use with D1VE block casting number.
D9TZ-6316-C (replaced D9TZ-6316-B) .. 1979/95 460 Harmonic Balancer-Use with D9TE block casting number.
F5TZ-6312-CA .. 1996/97 460 Harmonic Balancer.
D9TE-6015-AB = External balance: Some 1979 F150/350 & Econoline 460; 1980 and later Econoline 460; 1983 and later F250/350.
Mid-year 1979, FoMoCo changed the 460 engine, it's externally balanced, has a weighted crank spacer.
There are no before/from serial numbers or production dates, the block casting number must be known to get the correct harmonic balancer and flywheel.
Originally Posted by ArdWrknTrk
The harmonic balancers are all the same, internal or external. 
D0OZ-6316-B .. 1970/73 429/460 Harmonic Balancer / D4VZ-6316-A .. 1974/79 460 Harmonic Balancer-Use with D1VE block casting number.
D9TZ-6316-C (replaced D9TZ-6316-B) .. 1979/95 460 Harmonic Balancer-Use with D9TE block casting number.
F5TZ-6312-CA .. 1996/97 460 Harmonic Balancer.
pedant
Joined: Jan 2008
Posts: 23,576
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From: EXTREME southwest CT
The *balancer* is the porkchop spacer.
The *damper* is the pulley attachment point with the rubber bonded ring that has the timing marks.
These aren't weighted
See: 521 Harmonic Balancer question - 460 Ford Forum
Ford Parts Specialist
Joined: Nov 2006
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From: Simi Valley, CA
Bill, I clarified my post.
The *balancer* is the porkchop spacer.
The *damper* is the pulley attachment point with the rubber bonded ring that has the timing marks.
These aren't weighted
See: 521 Harmonic Balancer question - 460 Ford Forum
The *balancer* is the porkchop spacer.
The *damper* is the pulley attachment point with the rubber bonded ring that has the timing marks.
These aren't weighted
See: 521 Harmonic Balancer question - 460 Ford Forum
Looks to me that the OP added a weighted crank spacer to the internally balanced block, no wonder there's a vibration.
pedant
Joined: Jan 2008
Posts: 23,576
Likes: 40
From: EXTREME southwest CT
460 trucks didn't come with manual until 1983.
This is well after the 1979 running change.