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2/6/17 10:53pm - Original Message: 'Steering Cylinder Pulses'
Bluestreak
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Vette(s):
72 Coupe /Blue

Joined: 1/30/2017
Posts: 4
72 Coupe.  Installed new lines, control valve and steering cylinder.  Bled system per directions that came with control valve.  Steering cylinder pulses or hammers when turning steering wheel, especially when to the left.  Have checked check valve in pump.  Thought the new control valve was defective, so installed another new one.  Still have same problems.  Any suggestions.
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2/6/17 11:45pm - Reply: 'Re: Steering Cylinder Pulses'
73shark
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Overland Park, KS - USA

Vette(s):
1973 Orange Metallic Coupe (orig owner), L82, 4 spd (WR), PS, (A/C & PW (I installed from wrecked 73)), leather, AM/FM Stereo, ran with '65 FI unit earlier & will again some day.

Joined: 7/9/2003
Posts: 381
Haven't done mine yet but it sounds like there may still be air in the system somewhere.

____________________________________

1973 L-82 4 spd

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2/6/17 11:59pm - Reply: 'Re: Steering Cylinder Pulses'
Bluestreak
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Vette(s):
72 Coupe /Blue

Joined: 1/30/2017
Posts: 4
Any suggestions here as to how to bled the system?
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2/18/17 10:09am - Reply: 'Re: Steering Cylinder Pulses'
Steevo
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San Diego, CA - USA

Vette(s):
'73 Coupe, 350, Auto, A/C, Electric Windows. White exterior w/ Dk Blue interior.OEM Aluminum Wheels

Joined: 11/10/2013
Posts: 10
Bluestreak said: Any suggestions here as to how to bled the system?
Hi Bluestreak,
About the only way I know how to bleed this system is to put the front end on jack stands to free the tires off the ground, start the car, and steer the wheel left to right, stop to stop, a number of times and see if this helps. My experience has been; when any single Left or Right turning anomaly occurs, the problem points to the Control Valve. You've replaced it twice, right?
I wonder what would happen if, while on jacks and engine running, you adjusted that Control Valve to move the wheels Left and Right, from stop to stop, then balance, and then see if the problem still exists.
Is the Pump old, or been replaced?
 
There's not much to this system. Hope you find it and let us know.
 
Steve





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2/18/17 3:56pm - Reply: 'Re: Steering Cylinder Pulses'
Vman73
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Gig Harbor, WA - USA

Vette(s):
1973 L82 4 Speed Coupe - Very original, well documented driver/survivor. 2016 Bend Regional NCRS Top Flight.

Joined: 10/2/2014
Posts: 357
Steevo said:
Bluestreak said: Any suggestions here as to how to bled the system?
Hi Bluestreak,
About the only way I know how to bleed this system is to put the front end on jack stands to free the tires off the ground, start the car, and steer the wheel left to right, stop to stop, a number of times and see if this helps. My experience has been; when any single Left or Right turning anomaly occurs, the problem points to the Control Valve. You've replaced it twice, right?
I wonder what would happen if, while on jacks and engine running, you adjusted that Control Valve to move the wheels Left and Right, from stop to stop, then balance, and then see if the problem still exists.
Is the Pump old, or been replaced?
 
There's not much to this system. Hope you find it and let us know.
 
Steve






+1 on Steevo's reply. Balance control valve with engine running and front wheels off the ground. Once balanced, then back and forth lock to lock to bleed while checking fluid level. It's possible that your pump is causing the pulse but I suspect the control valve. I've heard about a lot of issues with recent rebuilt units. Newer control valve castings are being knocked off overseas and do not have same quality/function as ones rebuilt with real GM core castings. Let us know if you find the issue.

____________________________________
John Sigmund
valkman57@sbcglobal.net
NCRS Member 61302
NW NCRS Chapter Member



Duct tape is the new Black !!
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2/20/17 4:33pm - Reply: 'Re: Steering Cylinder Pulses'
Bluestreak
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Vette(s):
72 Coupe /Blue

Joined: 1/30/2017
Posts: 4
Control Unit has been replaced twice with new, not rebuilt.  Steering Cylinder was replaced at same time with all new lines.  Old unit did not exhibit these problems.  Pump is about 30 years old.  Will try centering control valve and let you know is this helps.  Thanks for the reply.
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2/20/17 4:36pm - Reply: 'Re: Steering Cylinder Pulses'
Bluestreak
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Vette(s):
72 Coupe /Blue

Joined: 1/30/2017
Posts: 4
Control valve has been replaced twice with new unit, not rebuilt.  Steering cylinder was replaced at same time with all new lines.  Old valve did not exhibit any of these problems.  Will try and balance control valve and let you know results.  Thanks for the reply.
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