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Buddy of mine has a 68 Stingray. Whenever he backs up to park and has to turn some the steering leaks.. It'll leave a trail. but not forward. Whats up? Seems like everything checks out. weird.
Steering leaks backing up
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Anyone? I know its weird question but I've seen it and we cant figure it out.
Steering doesn't know forward from reverse. It really doesn't know right from left. However, during parking, you usually use the full turn or what is called lock to lock.
While parked try turning the wheel full left turn until it stops. Does it make any noise? Try turning the wheel back to the right until it stops. Does it make any noise? Do this a couple of times and you should find the leak and it more than likely will also start to squeal.
Good luck. :beers:
While parked try turning the wheel full left turn until it stops. Does it make any noise? Try turning the wheel back to the right until it stops. Does it make any noise? Do this a couple of times and you should find the leak and it more than likely will also start to squeal.
Good luck. :beers:
Just a couple points of clarification. The 1968 Corvette has a linkage booster power steering system. The pump feeds a control valve that is attached to the relay rod. An assist cylinder is also connected to the relay rod and is fed by seperate pressure hose assemblies for right and left turns.
Chevelles never had a linkage booster type power assist system. Big Chevrolet Impalas (B-Cars) had a linkage booster type power assist steering through the 1964 model year.
It is absolutely correct that the steering system does not know (or care) if the Vette is driven forward or reverse.
Here are a couple of further truths:
The pump and the pressure hose from the pump to the control valve does not know (or care) if the car is being turned right or left. The pressure hose or the discharge portion of the pump could leak any time you were making a turn.
There is a pressure hose assembly from the control valve to the assist cylinder for a right turn and also another pressure hose assembly for a left turn. You could have only one hose assembly leaking that could show up only during a right turn (or only during a left turn.)
The low pressure return line hose assembly (from the control valve back to the pump reservoir) always has fluid flow when the engine if running. The one exception would be if you make a turn to full lock and hold the steering wheel at full lock. Any maneuver at full lock turn more than just a few seconds can be very harmful to the pump.
Jim
Chevelles never had a linkage booster type power assist system. Big Chevrolet Impalas (B-Cars) had a linkage booster type power assist steering through the 1964 model year.
It is absolutely correct that the steering system does not know (or care) if the Vette is driven forward or reverse.
Here are a couple of further truths:
The pump and the pressure hose from the pump to the control valve does not know (or care) if the car is being turned right or left. The pressure hose or the discharge portion of the pump could leak any time you were making a turn.
There is a pressure hose assembly from the control valve to the assist cylinder for a right turn and also another pressure hose assembly for a left turn. You could have only one hose assembly leaking that could show up only during a right turn (or only during a left turn.)
The low pressure return line hose assembly (from the control valve back to the pump reservoir) always has fluid flow when the engine if running. The one exception would be if you make a turn to full lock and hold the steering wheel at full lock. Any maneuver at full lock turn more than just a few seconds can be very harmful to the pump.
Jim
I am not aware that any steering system continues to cycle fluid with engine running and steering OFF lock. Power steering is an ASSIST type function and only performs when the driver makes the first move (left or right). This allows the fluid to ASSIST the driver in turning. So, I am not sure about the fluid constantly cycling. But, hey.
Still I would recommend raising the front of the car during the LOCK to LOCK, to see which side (direction) is causing the leak.
:beers:
Still I would recommend raising the front of the car during the LOCK to LOCK, to see which side (direction) is causing the leak.
:beers:
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250 Posts
Awesome, Thanks guys!
Nearly 100% of hydraulic power steering systems utilize an "open center" control valve concept. Power steering fluid flows out of the pump down through some type of valve. When driving straight ahead, your system is typically flowing 2.5 gallons per minute through the system and back to the pump reservoir with something like 50 psi of system backpressure.
When you start to turn the steering wheel, you partially restrict that flow, build pressure, and the valve directs the pressure to the side of the assist piston that helps you steer in the proper direction.
The 1963 through 1982 Corvette and the pre-1965 Chevrolet B-cars had linear valves but they still were open center just like all the later rotary valve power gears.
Jim
When you start to turn the steering wheel, you partially restrict that flow, build pressure, and the valve directs the pressure to the side of the assist piston that helps you steer in the proper direction.
The 1963 through 1982 Corvette and the pre-1965 Chevrolet B-cars had linear valves but they still were open center just like all the later rotary valve power gears.
Jim
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I have put P/S systems in my 66 and 68 Vettes. You really have to find out what is leaking. It could be a loose hose connection or any component for that matter. All the parts you need are availavle at Vette Brakes and Products in St. Petersburg, FL. Most major components can be exchanged out. Good luck. Jerry
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