Series Motor Mount

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Series Motor Mount
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One of the scariest problems that occurs on Jeep Cherokees is know as death wobble. Death Wobble is when the front tires start to shake violently. Think of a shopping cart wheel that flutters and having two of them on the front of your Jeep.

Death wobble is very common on lifted Jeeps but can occur on stock vehicle as well. The root cause is the instability of the inverted Y steering linkage on the Jeep.

When every thing is working well, this type of steering and suspension works very well. However, when things go wrong, the shake can be very scary and can potentially damaging.

The axle is located side to side by the track bar. The joint on the frame end is made like a tie rod and is susceptible to damage due to corrosion and over extension. Just a very sight amount of wear in this joint can allow the axle to move side to side and can lead to the death wobble shake.

Another base cause of death wobble is the caster angle. The caster angle changes slightly when the XJ Cherokee is lifted due to the unequal length control arms. This angle can be corrected with shims. Very often death wobble can be eliminated by altering the caster angle. More or less caster than the factory recommended settings may be required for your suspension so you may have to experiment.

Worn or soft control arm bushings can lead to caster angle changes and therefore lead to death wobble. Replacing worn bushings are retrofitting polyurethane bushings can correct your steering angles and sometimes eliminate the death wobble.

Sometimes the source of death wobble can be very elusive. Some cases have been reported where the mount for the track bar has become slightly lose either due to loose bolts or metal fatigue and death wobble occurs. This one can be particularly hard to find as every thing may look fine in a visual inspection of the suspension.

To check the track bar and it mounting points, have an assistant move the steering wheel back and forth while you observe the track bar and its mounting points. Also, by placing a finger on the tire and on the fender flare note any side to side movement of the axle when the wheels are turned. Often you can feel the axle body of the truck move slightly before the wheel starts to turn if there is wear in the track bar or is mounts.

Another possible source of difficulty are the steering box bolts. The bolts that pass through the steering box and secure it to the frame also pass through an aluminum spacer. Often this spacer corrodes and keeps the bolts form turning. Even if they feel tight with a wrench, they may not be holding the box tight to the frame. Also, this area of the frame is highly stressed by off road driving and larger tires and can break. Any looseness in the steering box mounts can contribute to death wobble.

If all else fails in trying to correct a death wobble situation, you can try replacing the steering stabilizer. However, in doing so you are only masking the problem not curing it.

In an emergency situation where you must drive a XJ that is experiencing death wobble there are a few tricks that you can try. The first is to toe out the steering by adjusting the tie rod. This will wear the tires but will also put pressure on the suspension and keep it in place so it does not shake making the Jeep drivable. Reducing the air pressure in the tires to trail levels can also eliminate death wobble although I am not sure why.

Death wobble can be a very scary problem and can be very frustrating to solve. Often it is only intermittent and happens at the most inopportune times. If these common solutions do not cure your death wobble see my website for a more thorough list of things to check.

Mike Strawbridge is a Performance Improvement Coach who loves helping people achieve what they truly want in life and business.

To learn more about how to repair or improve the performance of your Jeep Cherokee ==> Jeep Cherokee Maintenance and trouble shooting

Stepper Motor Controller Coin Size Only 1.665*1.665*0.53 Inch From Shanghai

Shanghai UI Robot Technology Co., Ltd

Stepper Motor Controller&Driver designer and producer from Shanghai.

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UIM24002/UIM24004/UIM24008 Stepper Motor Controller with Microstepping

Features:

Miniature Size 42.3mm*42.3mm*13.5mm

Integrally designed to fit onto motors seamlessly, as well as work standalone

10-40VDC supply, Max 2A/4A/8A adjustable output current, 1to16 Microstepping

Dual H-bridge with PWM constant current control,

Enable/shutdown controllable

Opto-isolated inputs with common anode.

Die-cast aluminium enclosure

Overview

UIM24002/24004/24008 is a series of miniature, high performance stepper motor controller.  They can be mounted onto 42/57/86/110 series stepper motor seamless through corresponding flanges.  The thickness of these controllers is less than 14mm, UIM 24002 is capable to provide 0.5-2A adjustable current. UIM 24004 is capable for 1.6-4A adjustable current output. UIM24008 is capable for 2A-8A.adjustable current output.  Their mixed-decay current control reduces the back-EMF effect under high speed  running condition and improves the performance. Except the UIM24002 takes 10-35VDC input, UIM240xx series controllers can work with 12 to 40VDC input.. Enclosures of the UIM240xx controller are made of die-cast aluminum which provide a rugged and durable protection and improve the heat dissipation..

Absolute Maximum Ratings

Supply Voltage 12~40VDC (10~35VDC for UIM24002)

Current input at logic pins:  +/- 30mA

Storage Temperature  -68F - +257F

Operating Temperature -68F - +185F

Note: Stresses beyond those listed under "absolute maximum ratings" may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated under "recommended operating conditions" is not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.

Electrical Characteristics (Ambient Temperature Ta = 77F)

Supply Voltage: 12-40V DC  (10~35VDC for UIM24002)

Output Pahse Current: Max 2A/4A/8A (1)

Current Control:  Constant, PWM control

Microstepping: Full-, Half-, Quarter- and 16th-step (2)

Photocoupler Isolation voltage: 2500 Vrms (min)

Photocoupler Input current:  MAX +/- 45mA

Note:

(1)   adjustable through on-board POT

(2)   adjustable through on-board DIP switch

Communication: 3-wire, Step, Direction, and Enable signals

Handling, Storage and Size:

Cooling Type: Free air

Working Environment:     Free of heavy dust, oil mist and corrosive gas

                        Ambient Tempareture: -68F﹋+144F

                        Humidity: Lower than 80%RH, no condensation and frost

                        Vibration: 1G Max

Storage Tempareture: -68F - +257F

Dimensions: 42.3mm*42.3mm*13.5mm

Weight: 0.1kg

Product Manager: Tiger Huang

Address: The 8th floor, No. 83 Anshun Road, Changning District, Shanghai

Tel: 0086-21-62818217  Fax:0086-21-62817095  MP:0086-13585831572

http://www.uirobot.com/

Yahoo Messenger: uirobot@yahoo.com  MSN(Live): tiger@uirobot.com

 

 

About the Author

1994 civic hatch motor swap?

right now I've got a 1994 civic hatchback with the d... what ever motor and i want to go faster....right now I'm doing all the body work but I'm eventually going to do the swap and then boost the new motor. I'm looking at any b..16 or 18.../h /k series motors. What do i need to do the swap motor and tranny mounts wiring harnesses? and what would be the easiest motor (that's good to boost) to swap into it...I've got nearly all tools known to man so tell me what I need or share a link that can please.

First of all you always use your car's engine harness
it doesn't matter what engine you put in your car
and second if you want a easy motor to boost, any B series engine will work

H and K series engine requires extra work, so the easiest would be a B16 or B18

I suggest a B18
here's what you need

check this out they have everything you need all in one place
comes with everything you need for a complete and headache free swap
http://www.jdmsource.ca/v2/product.asp?ID=16

There's other engine there too if you want to go with something else

Part III: Doctor moves quickly to remove little girl's massive brain tumor
Meanwhile, another of his patients remains in intensive care, where electrodes implanted by the surgeon monitor the boy's brain activity.

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