Question about 1984 Ford F 150

1 Answer

Clutch will not disengage

My son installed a new clutch in his 84 f-150 four wheel drive with a 300 6cyl, the new clutch will not disengage allowing us to shift.

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  • rsarrasin Apr 23, 2009

    slave cylinder is working great, getting any where from 1/2 to 5/8 throw on the throwout bearing, how could he have put the disc in bakwards, now that would be funny.

  • Dave  C
    Dave C May 11, 2010

    It kind of looks the same on both sides and the splined hub will go on the input shaft of the transmission either way but the hub is longer on the transmission side and if it is installed on the flywheel side, it will press against something and bind up.

  • Dave  C
    Dave C May 11, 2010

    If the hydraulics have been bled and you're sure that the clutch fork is operating properly against the release bearing, then he may have put the friction disc in back-to-front.

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  • Master
  • 710 Answers

Check the reservoir on the firewall near the master cylinder. If the reservoir is empty fill it with brake fluid and pump the clutch and bleed the air out on the side of the transmission.

Posted on Apr 23, 2009

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1 Answer

How do I repair the four wheel drive on a 1999 Ford Ranger XLT?


It depends on what is wrong , is the 4x4 light flashing ? Are you aware of the complexity of the 4x4 system ? Has a electronic control module , has the ability to set an store DTC'S - diagnostic trouble codes !
Transfer Case The four wheel drive system is an electronic shift 4X4 system that allows the operator to choose between three different modes. The operator can switch 4X4 HIGH modes at any speed. To engage or disengage 4X4 LOW the vehicle speed must be less than 5 kph (3 mph), the brake depressed, and the transmission must be in NEUTRAL.
The shift motor sense plate, an integral part of the electronic shift motor, informs the generic electronic module (GEM) of the transfer case shift motor and contact plates A, B, C and D position.
The digital transmission range (TR) sensor is located on the LH side of the transmission, and informs the GEM when the transmission is in the NEUTRAL position.
The electronic shift motor is mounted externally at the rear of the transfer case. It drives a rotary cam which moves the mode fork and range fork within the transfer case between the 4X4 HIGH, 4X4 LOW and 2WD range positions.
When the GEM verifies the completion of the transfer case shift from 2WD to 4X4 HIGH (reading the contact plate positions), the GEM will then energize both pulse vacuum hublock (PVH) solenoids (supplying ground for 45 seconds). The PVH solenoid will allow a HIGH flow of intake manifold vacuum to the "wheel end hublocks", engaging the wheel end hubs to the front differential and transfer case to achieve four wheel drive.
Here are just a few DTC'S the system can set an store in the module !
P1804 4WD High Indicator Circuit Failure GEM GO to Pinpoint Test C . P1806 4WD High Indicator Short to Battery GEM GO to Pinpoint Test C . P1808 4WD Low Indicator Circuit Failure GEM GO to Pinpoint Test C . P1810 4WD Low Indicator Short to Power GEM GO to Pinpoint Test C . P1812 4WD Mode Select Switch Circuit Failure GEM GO to Pinpoint Test A . P1815 4WD Mode Select Switch Circuit Short to Ground GEM GO to Pinpoint Test A . P1820 Transfer Case CW Shift Relay Circuit - Failure GEM GO to Pinpoint Test A . P1822 Transfer Case CW Shift Relay Coil Short to Power GEM GO to Pinpoint Test A . P1824 4WD Electric Clutch Relay Circuit Failure GEM GO to Pinpoint Test A . P1826 4WD Low Clutch Relay Short to Power GEM GO to Pinpoint Test A . P1828 Transfer Case CCW Shift Relay Coil Circuit Failure GEM GO to Pinpoint Test A . P1830 Transfer Case CCW Shift Relay Coil Short to Battery GEM GO to Pinpoint Test A . P1838 Transfer Case Shift Motor Circuit Failure GEM GO to Pinpoint Test A . P1846 Transfer Case CONTACT PLATE "A" Circuit Failure GEM GO to Pinpoint Test A . Now are you sure you really want to mess with this ? You would need a factory diagnostic scan tool to check this out before you start replacing parts !
Here

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2 Answers

How do i disengae from four wheel drive


At best as I know the 2005 Prado is all time 4WD vehicle.
Is the engine running ? Can you shift the gears ?
May be something is broken in the drive train...
As a suggestion you can go home by locking the centre differential, proceeding at low speed and checking for noises .
Pls. let me know if it helps...

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After the four drive kicks in from a mslippery spot, it doesn't seem to disengage once you get to the bare road and seems to make a sound like it is trying to disengage


Sounds like you have a faulty actuator, when you put the truck in neutral you taking load off of it allowing it to shift it sounds as it has gotten weak over time

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1 Answer

Vehicle dies when downshifting to first gear and also makes a squeling noise


Manual Transmission

  1. 1
    Park your car with its front tyres touching the curb. Engage 1st and start slowly releasing the clutch pedal without applying any throttle. The engine should gradually fade out and bog down when the pedal is completely released. If the engine just bogs down at some point, or the fading is not gradual, the clutch is damaged. If the gearbox grinds when you try to shift in first from a standstill, there's a damage in the clutch too.
    550px-find-out-if-a-transmission-has-gone-out-step-1.jpg


  2. 2
    Try to pull off in 3rd gear with the front wheels at the curb, and without applying throttle. If the engine doesn't die, it shows a complete clutch failure. In that case, do not drive this vehicle.
    550px-find-out-if-a-transmission-has-gone-out-step-2.jpg
  3. 3
    Find a smooth, straight road to test the vehicle. Start from first, and slowly accelerate from second. As you do this use late-shifting, i.e. slightly over-rev the engine (approx. 500-1000 RPM faster than the revs you'd normally shift at). Up-shift to second without using double-clutching. Repeat the same procedure when shifting into 3rd. Now, with your car running at approximately 50 km/h (25 mph) try down-shifting to second without double-clutching. Both the up-shifting and the down-shifting must be done without grinding. Grinding of the gears indicates a gearbox malfunction, most likely in the sync gears ("synchronizers"). To make sure it's the synchronizers, try up-shifting and down-shifting with double-clutching. If the grinding stops, then it's the synchronization.
    550px-find-out-if-a-transmission-has-gone-out-step-3.jpg
550px-find-out-if-a-transmission-has-gone-out-step-4.jpg
  • 2
    Shift into drive and hold the break pedal after making sure your brakes work. Press the gas pedal all the way down. The engine should not fade. If it does, it means the transmission (particularly the clutch) does not disengage completely.
    550px-find-out-if-a-transmission-has-gone-out-step-5.jpg
  • 3
    Check for smooth shifting. On an even and relatively horizontal road you should be able to accelerate without any tangible jolts. If there are such, the gearbox has malfunctioned.
    550px-find-out-if-a-transmission-has-gone-out-step-6.jpg
  • 4
    Check for vibrations. Driving at about 70 km/h (35 mph) switch to Neutral (both auto and manual). There shouldn't be any lateral vibrations. If there are, this is either due to a warping of the drive-shaft, or a suspension damage. Basically, drive-shaft warping is perceived as a vibration in both vertical and horizontal direction, whereas a suspension damage is felt as a vibration in only one direction (i.e. either horizontally or vertically).
    550px-find-out-if-a-transmission-has-gone-out-step-7.jpg
  • 5
    Test steering. When trying to enter a corner with approximately 30 km/h (15 mph) there shouldn't be any tangible under-steer. The presence of such may be due to a differential failure, especially in FWD cars. Novice drivers must never try and test their differentials by trying to induce under/over-steer!
    550px-find-out-if-a-transmission-has-gone-out-step-8.jpg
  • EditTips for preventing transmission damages

    • Avoid prolonged driving by slipping the clutch.
    • Avoid jerks and jolts while driving.
    • Avoid "riding the clutch", i.e. needlessly keeping your foot on the clutch pedal.
    • Never use clutch slipping for regulating the speed of a heavy truck!
    • Make sure the clutch of a manual transmission is fully pressed when shifting
    • Do not use excessive force when shifting a manual.
    • For rear wheel drive (RWD) vehicles, avoid driving through places at the minimum of the vehicle's clearance.
    EditTips

    • Incomplete disengaging is due to the trailing disc sticking to the leading one, e.g. because of mechanical soiling of the friction surfaces or worn out springs.
    • Incomplete disengaging in automatic transmissions is felt as a forward jolt when the gearbox changes gears, whereas incomplete engaging is felt as over-revving the engine without any significant change in speed, especially when stepping on the throttle at high speeds (over 50 km/h or 30 mph).
    • Automatic transmissions have the so-called "hydraulic clutch". It's basically a combination of a hydraulic pump, driven by the engine, and a hydraulic motor, linked to the rest of the drive-train. This allows for the hydraulic liquid to flow through the motor, even if its load is too big for the engine to rotate it. This eases operation, but results in poorer acceleration, greater fuel consumption and severely decreased ability of the driver to use engine braking, which can be very dangerous on long downward slopes. Hydraulic clutches are easier to operate in urban driving, but become a drawback on long roads
    • Gearboxes come in three types: manual, semi-automatic, and automatic
    • Malfunctions in a hydraulic clutch include incomplete disengaging (due to old hydraulic fluid, which has become thicker than specified by the manufacturer), or incomplete engaging (most often due to a leak of hydraulic fluid or presence of an air pocket within the hydraulic circuit. These are both dealt with by replacing the hydraulic fluid, bleeding (if necessary) of the hydraulic system, and removing any possible leaks.
    • The most common malfunction of a dispatch box is the inability to change its function (e.g. switch between 4x2 and 4x4) If this happens, refer to a repair shop.
    • The clutch is designed to smoothly disconnect the engine from the rest of the drive-train.
    • The clutch disengaging too low or too high is an indication of a worn out trailing disc.
    • There are implements that allow an automatic gearbox to operate in semi-automatic mode, allowing the driver to manually shift gear up or gear down, but w/o using a clutch. These operate exclusively by aids of electronics. This is common in high-class German cars like the S-Klasse Mercedes. Usually the corresponding position of the lever is marked with T or M and the driver selects a gear down by moving the lever to the left, and a gear up by nudging it do the right.
    • Semi-automatic gearboxes are combined with a hydraulic clutch. They allow the driver to select a gear up or a gear down. These are most often seen in rally cars, where there are two levers on both sides of the steering wheel. Usually the right one switches a gear up, and the left one switches a gear down.

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