On initial engine startup. having re-installed the rebuilt power steering system, the wheels moved about 2/3 to the right and remained. I did not try turning the wheel. How do I re-center the system?
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Re: '67 POWER STEERING ADJUSTMENT
Turn the nut on the end of the control valve until the system remains in position without moving. I forget which direction for right vs left. -
Re: '67 POWER STEERING ADJUSTMENT
specifics addressed in shop manual. mikeComment
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Re: '67 POWER STEERING ADJUSTMENT
Rob,Be sure to make your adjustments with the car jacked up and wheels off the ground so there is no drag/load on tiresComment
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Re: '67 POWER STEERING ADJUSTMENT
This is, I assume done with the engine not running....Comment
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Re: '67 POWER STEERING ADJUSTMENT
Rob,
The motor must be running to drive the p/s pump in order generate pressure. What you are adjusting is the spool in its valve. It needs to be exactly centered or will send pressure to one side or the other of the piston, causing assist and the entire linkage to shift. Normally when the pitman arm moves the stud sticking out of the valve it causes the spool to shift, causing the assist, this is why you need to have wheels off the ground to be sure no pressure is bleeding to one side, it is possible for very little to bleed by but will not be enough to move the wheels as the tires will have enough resistance on the ground to prevent movement. Once you start moving that bit of pressure will cause the car to pull to side getting the assist. Hence, important to center the spool while there is no resistance.
Good luck!Comment
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Re: '67 POWER STEERING ADJUSTMENT
The control valve centering procedure is covered in step-by-step detail in the Chassis Service Manual; if you don't have one, get one - you need it. Whatever you do, DO NOT reach through the steering wheel to start the engine if the valve hasn't been centered - it can break your arm.Comment
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Re: '67 POWER STEERING ADJUSTMENT
John,
I have the service manual. I see the procedure for bleeding the power steering system, which involves the front wheels off the ground, and then on. I also see the over-center adjustment procedure, but it doesn't call for the wheels to be off the ground.Comment
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Re: '67 POWER STEERING ADJUSTMENT
Rob, you will get a better adjustment if, with the front wheels off the ground, disconnect the slave cylinder shaft from its bracket on the frame, letting it hang down supported by the two hoses. Take the end cap off of the control valve and get a 7/16" socket and a 1/4" drive ratchet ready to turn the adjustment nut. Start the engine and use the control valve nut to adjust the slave cylinder rod in and out until you balance the shaft in a neutral position, neither moving in or out, as the engine is running. As it states in the shop manual.
Disconnecting the slave cylinder shaft from its bracket will give you a finer adjustment because the system does not have to move all the linkages and wheels back and forth. Its also safer and easier on the system. And if you put your arm through the steering wheel when you start the engine it will not hurt your arm.
Now hook the shaft up to the frame bracket, check the fluid level, adding fluid if necessary and move the wheels lock to lock several times to purge the air, add more fluid if necessary, lower the Corvette to the ground and away you go. Sometime in this process put the control valve cap back on.
ScottComment
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Re: '67 POWER STEERING ADJUSTMENT
Thanks a lot for the info....Comment
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