Repair cvt VT25-E/VT20-E, Saturn, Opel.
Demonstrated inside the repair of variator VT25-E/VT20-E (continuous
variable transmission: CVT), mounted on car Saturn Vue 2,2l 2002-2005 and
Ion Quad Coupe 2,2l 2003-2004. Also installed on the car Opel Signum
2004-2007 and the Opel Vectra C 2004-2007.
Ремонт вариатора VT25-E/VT20-E. Saturn Vue, OPEL.
Transmissions: Pros and Cons of Rebuilding Continuously Variable Transmissions
Supported by Transtar and TransTec and produced by Motor Age in partnership
with ATSG, this training program explores the various CVT configurations,
their operation, parts and tool availability to help you determine which
repairs can and cannot be made in your shop. Best of all, this program will
provide basic tips for the average transmission specialist to determine if
the shop can rebuild that CVT profitably or if the transmission will need
to be replaced. Click this link to subscribe to Motor Age!
CVT Transmission Belt to Pulley Clamping
CVT Belt to Pulley Clamping
Get the book here:
The key to understanding how a CVT works, is by reviewing how the chain and
cone pulley react with each other. All CVTs have one weak spot, the contact
point. This is where there is a tendency for the whole transmission to
slip, grind and sustain damage. Incredibly enough, this is not where CVTs
fail the most, but more on that later.
The CVT belt is composed of two groups of metal rings, each of 7 to 12
rings, and a few hundred special metal links. It is these links the ones
with direct contact with the cone pulleys, or variators as they're called
by the manufacturer. For good clamping force, the CVT needs a specific
transmission fluid. To neglect this fact is to ask for trouble, as the CVT
will get damaged due to slipping and grinding between the belt links and
There's also another aspect of the CVT clamping force that needs to be
reviewed, which is the hydraulic pressure exerted on the cone pulleys or
variator. The CVT oil or hydraulic pump can generate as much as 1000 PSI of
pressure. but not everything in the CVT needs this much pressure. Because
800 or more PSI is more than most circuits need, line pressure is regulated
down to three lower levels, 220 PSI maximum for the clutches and variator,
140 PSI for the TCC, or torque converter, and 80 PSI for the lube and
cooler circuits. The CVT also has a few ... Get the whole story right here
in this video... Enjoy...
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Transmission No Shift Case Study (P0888)
To learn more of testing procedures shown in this video, go to
This is a 2002 Dodge Caravan that is stuck in second gear. This is known as
limp home mode or transmission limp mode. In this video I cover the
How to test a computer controlled relay
How to do a loaded circuit voltage drop test
How to determine if a relay is power or ground side controlled.
How to test for an open circuit
Why the computer enters limp mode
P0888 Flow Chart
Transmission wiring diagram overview
Transmission solenoid power
Learn About Transmission Synchro Rings
Learn how transmission synchro rings work. Paul Cangialosi from 5speeds.com
discusses the function of synchro rings typically used in Muncie, T10, T5,
and T56 transmissions.
How Car Transmission System Works
Know how the transmission system inside an automobile works. Do not forget
to hit like if you found this video useful.
Please Note: The differential gear system was mistakenly animated, and the
actual rotation of the pinion and the ring gear is opposite to what is
GM 4L80-E Transmission Rebuild - Transmission repair
GM 4L80-E Transmission Rebuild - Transmission Repair
Here is a full rebuild video of a GM 4L80-E Transmission. We see the parts
that took for a successful repair. Complete overhaul kit with clutches and
steels and molded pistons. All bushings as well.
There's some items that I personally would've add to the parts list but
since this is for a Transmission Shop down the road this is what I was
Items I would add are:
Actuator Feed limit Valve, Transgo.
TCC Regulator Valve Kit from Sonnax.
1-2 & 3-4 Shift Valve Springs from Sonnax.
TCC PWM Solenoid.
And Shift Solenoids if needed.
How to adjust bands and change automatic transmission fluid
This is a demonstration of how I tightened the bands of my automatic
transmission and changed the transmission fluid and filter. The vehicle is
a 1998 Dodge Ram 1500 4X4 with a 46RE transmission. This repair was done
after a transfer case repair which required removal of the propeller
shafts. With the front shaft out of the way, access to the front band
adjustment screw was better than normal. It is possible to do this with the
shaft in place, but access for demonstration is not as good. For details of
how the propeller shaft is removed, see my other videos on repairing a
Dodge transfer case oil leak.
Note that the details of how this is done, especially the torque settings
and the number of rotations backward after ideal torque, are very specific
to the 46RE transmission. Be sure the locknut is backed off enough that it
doesn't bottom out when the adjustment screw is tightened. Before ever
doing this type of procedure yourself, you should consult the dealers
repair manual and verify the specific procedure in your car.
This is an amateur demonstration done for entertainment purposes only. The
information offered here is given in good faith but with no guarantees of
accuracy or safety. Any misadventure you encounter if you decide to do
maintenance on your own vehicle is your responsibility.
Short clip of music midway through is royalty free music "The Messenger",
from Youtube creation tools, author unknown. Thunderclap sound used under
Creative Commons 3.0 license, done by RHumphries at
Honda Transmission Repair 2
On this video we see the necessary parts needed for a successful rebuild on
these Honda units. The main issue is the converter lacking lubrication and
burning up. There is a new valve from sonnax to correct this issue. As well
as the "O"ring end plugs and TC check valve.
SUBSCRIBE above, click the like button and leave your comments bellow.
Thanks for watching.
Driven shaft VT25-E/VT20-E.wmv
Slave movable cone (pulley) with bearings (only have nine balls) is based
on the output shaft of the variator (CVT). Drive shaft consists of movable
and fixed cone. Progress is also movable cone is 22 mm.
Push force necessary to create friction between the metal belt and
pulley cone shaped push-plates and a spring in the control cavities moving
Unfortunately movable cone seals can not be replaced, as outer "cup"
seamed, so it is detachable. Of course, if you have too much you can try
the shaft on a lathe to cut the outer "cup" through the rolling and open.
Then after replacing the seals brew.
Car Transmissions & Synchromesh: "Spinning Levers" 1936 Chevrolet Auto Mechanics 10min
more at http://auto-parts.quickfound.net/
Auto mechanics playlist:
'"The transmission in the modern motorcar -- the mechanism that makes it
possible to have three forward speeds and a reverse -- is a series of
levers, levers that spin."
VS cartoon of Archimedes trying to move earth with a lever extending from
the moon or another planet in outer space; CU cartoon of Archimedes says
"Give me a lever long enough and I can move the world."
CU disembodied hands using antique can opener to open a can of peaches; CU
can open cutting through top of can.
Two boys playing on a seesaw.
CU pitch bar tool inserted between train wheel and track; man cranks large
lever to move freight car along track; CU disembodied arm pumps lever
lifting antique car off ground.
VS man demonstrates basics of the lever using triangular piece as fulcrum
and a long metal piece, man attaches 10 lbs. weight to one end of the bar
and a 5 lbs. weight to the other end; man hangs various weights from both
ends of the bar balancing the two by moving the fulcrum to various points
along the bar; man demonstrates how a gear is constructed through numerous
VS stop-motion animation of two wheels with paddles added one by one
turning wheels into paddle wheels and then into interlocking gears; cuts to
more sophisticated gear; cuts to metal gears; VS CU different types of
machine gears, worm gears, bevel gears, lopsided gears.
Disembodied arm pieces together piece by piece a basic motor with various
gear components; superimposed text appears labeling various parts;
superimposed arrows identify different gears; motor begins to turn; cuts to
CU car drives across frame; cuts back to crude motor; camera pans to
Revolutions Per Minute dial which reads 100 rpm, camera pans to another RPM
instrument dial which reads 30 rpm; CU crude model of gears in motor,
superimposed arrows show flow of energy through the system.
CU RPM instrument dial reads 60 rpm; CU churning gears of motor,
superimposed arrows she flow of energy through gear system; VS man
demonstrates on gears how shifting to various gears works.
CU arrow point to 90 rpm on deal labeled Revolutions Per Minute; VS man
demonstrating different gears.
Great shot 4 lanes of cars stopped at stoplight on city street; Travel
Bureau sign in background.
CU disembodied hand in white glove shifts clutch of car; CU motor shifting
gears; CU tire with Chevrolet hubcap begins to move; 1920s and 1930s cars
stopped at traffic light begin to move; CU inside car woman shifts gears;
car driving down tree-lined highway in possibly New York, what appears to
be the Statue of Liberty is seen off in the distance.
Woman enters drivers seat of Chevrolet, man waves start flag; car drives
off down street; CU disembodied woman's foot on gas pedal beside break and
clutch pedal with Chevrolet logos; CU speedometer shows car hitting 60 mph;
CU woman downshifts; CU speedometer goes down to 35 mph; car stops at
bottom of hill.
CU sign along rugged road 'Steep Hill Use Second Gear"'
Public domain film from the Library of Congress Prelinger Archive, slightly
cropped to remove uneven edges, with the aspect ratio corrected, and mild
video noise reduction applied.
The soundtrack was also processed with volume normalization, noise
reduction, clipping reduction, and equalization (the resulting sound,
though not perfect, is far less noisy than the original).
A machine consists of a power source and a power transmission system, which
provides controlled application of the power. Merriam-Webster defines
transmission as: an assembly of parts including the speed-changing gears
and the propeller shaft by which the power is transmitted from an engine to
a live axle. Often transmission refers simply to the gearbox that uses
gears and gear trains to provide speed and torque conversions from a
rotating power source to another device...
Manual transmission come in two basic types:
- a simple but rugged sliding-mesh or unsynchronized / non-synchronous
system, where straight-cut spur gear sets are spinning freely, and must be
synchronized by the operator matching engine revs to road speed, to avoid
noisy and damaging "gear clash",
- and the now common constant-mesh gearboxes which can include
non-synchronised, or synchronized / synchromesh systems, where typically
diagonal cut helical (or sometimes either straight-cut, or double-helical)
gear sets are constantly "meshed" together, and a dog clutch is used for
changing gears. On synchromesh boxes, friction cones or "synchro-rings" are
used in addition to the dog clutch to closely match the rotational speeds
of the two sides of the (declutched) transmission before making a full