Well, a lot has to do with what kind of vehicle we are talking about. For future reference, YEAR, MAKE, MODEL and ENGINE SIZE is required information if you want someone to answer questions for your vehicle....
On MOST vehicles it is not required to loosen or remove the gear box to replace a pitman arm. On some vehicles this IS required because there is not enough room to use a pitman arm puller with the gearbox in place. So, basicly. if you can get the puller in there, the answer to your question is NO and if there is not enough room for the puller the answer would be YES.
The idler arm is totally different. Some vehicles have self-locking nuts where the idler arm connects to the center link. Others have "casltle" nuts and cotte pins. The self-locking nuts can be very difficult to remove and ven harder to get back on. The ones with the castle nuts are easier if the cotter pin comes out easy.
As for how long it takes...again, this is vehicle-specific. Most cars take just under an hour each for the idler arm and pitman arm.
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There is a tool called a pitman arm puller. You will also need something called a "pickle fork" to seperate the tie rod ends. total time with the proper tools is about an hour.
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Instructions
Park
the vehicle on a level surface and make sure the front wheels are pointing
straight ahead. Make sure the vehicle is in park (or in gear if you have manual
transmission) and set the parking brake.
Disconnect
the pitman arm from the steering box from underneath the front of the vehicle
by turning the holding bolt in a counterclockwise direction with an adjustable
wrench. Place a pitman arm puller (available at auto parts stores) over the
pitman arm and tighten the nut on the puller in a clockwise direction with an
adjustable wrench until the pitman arm loosens from the steering box shaft.
Remove the pitman arm and the puller.
Open
the hood and loosen the lock nut on top of the steering box from the engine
compartment with an adjustable wrench in a counterclockwise direction.
Place
a torque wrench on the steering shaft and turn the wrench one complete turn.
Make sure the torque reading is approximately 2 inch pounds. Tighten the
adjusting nut on top of the steering box (it comes out of the center of the
lock nut) in a clockwise direction with an adjustable wrench one half turn if
the torque wrench reading is too low. Loosen the nut in a counterclockwise
direction if the reading is too high.
Rotate
the steering shaft with the torque wrench again. Make adjustments to the
steering box adjusting nut as described in Step 4, if needed, until the correct
reading is obtained on the torque wrench.
Make
sure the steering wheel is in the straight ahead position and reattach the
pitman arm to the bottom of the steering shaft on the steering box. Tighten the
holding nut in a clockwise direction with an adjustable wrench until the pitman
arm seats into place.
Tighten
the lock nut on top of the steering box with an adjustable wrench in a clockwise
direction. Close the hood
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year, model and engine size, please!
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