power steering pump
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New User
Joined: Aug 2003
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From: Toronto
power steering pump
Hello Gentlemen:
I have lost 5 power steering pumps in last 6 months in my 1997 Aerostar. The leakage always occurs thru the seal on the pulley shaft.
Does anyone have any literature on hydraulic circuitry for the power steering. Or is there any releif or bypass vale which would need adjustment.
Any help will be greatly appreciated.
Thanx
I have lost 5 power steering pumps in last 6 months in my 1997 Aerostar. The leakage always occurs thru the seal on the pulley shaft.
Does anyone have any literature on hydraulic circuitry for the power steering. Or is there any releif or bypass vale which would need adjustment.
Any help will be greatly appreciated.
Thanx
Posting Guru
Joined: Apr 2000
Posts: 1,746
Likes: 4
From: PNW
power steering pump
With such short life on the pumps, I would suspect two things. First, the rebuilder (assuming these are rebuilt units) made a bad batch of pumps. I once had to try six different rebuilt starters before I found one that worked. Fortunately for me, I found out right away that the starters were bad and had the shop check the starters before I walked out the door.
The other thing I would suspect would be overheating the seal when the engine is first fired up after the pump is installed. If the pump is low on fluid, the seal could overheat. When you install the pump, you should turn the engine over with the starter but with the fuel pump and/or ignition disabled so that the engine won't run. Then turn the wheels lock to lock to get the air out of the system (the front wheels should be in the air). Then, stop turning the motor over and check the fluid level to avoid getting air in the system. Repeat until the fluid level stays constant.
The other thing I would suspect would be overheating the seal when the engine is first fired up after the pump is installed. If the pump is low on fluid, the seal could overheat. When you install the pump, you should turn the engine over with the starter but with the fuel pump and/or ignition disabled so that the engine won't run. Then turn the wheels lock to lock to get the air out of the system (the front wheels should be in the air). Then, stop turning the motor over and check the fluid level to avoid getting air in the system. Repeat until the fluid level stays constant.
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New User
Joined: Aug 2003
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From: Toronto
power steering pump
Actually all the pumps have been replaced by the three different technicians and the pumps will last for a week or so. The last one failed on I-90 just east of buffalo, NY, away from home in Toronto, Canada app. 120 miles and was replaced in Cheektowaga, NY and seems to be working so far. But again, after a week or two nearly all busted on me.
I am wondering that if the fluid, on turning the wheel gets restricted in line and that stoppage and constant churning of pump builds up excessive pressure right with in the pump and shoots out thru the "pulley seal". This could be due to a bypass valve or a flow control valve(if there is any) or seizing up of the plunger/valve momentarily. I have the manual but that is no help at all.
The poor rebuilding of pumps could also be correct , but my OEM pump suffered the same failure, thru that pulley seal. But after 42000 miles as compared to 2 or 300 miles each with the rebuilt pumps
A complete hydraulic circuitry for the pump fluid will certainly help me diagnose this problem. Any one has it or could perhaps refer to me??
By the way thanx for your help Mikeman, it was very kind of you.
I am wondering that if the fluid, on turning the wheel gets restricted in line and that stoppage and constant churning of pump builds up excessive pressure right with in the pump and shoots out thru the "pulley seal". This could be due to a bypass valve or a flow control valve(if there is any) or seizing up of the plunger/valve momentarily. I have the manual but that is no help at all.
The poor rebuilding of pumps could also be correct , but my OEM pump suffered the same failure, thru that pulley seal. But after 42000 miles as compared to 2 or 300 miles each with the rebuilt pumps
A complete hydraulic circuitry for the pump fluid will certainly help me diagnose this problem. Any one has it or could perhaps refer to me??
By the way thanx for your help Mikeman, it was very kind of you.
Posting Guru
Joined: Aug 2002
Posts: 1,041
Likes: 1
From: Orland USA
power steering pump
I would be thinking I would have a warped pulley or the pump is not inline with the rest.
If not that then I would look to the Cylinder that the pump goes into. Maybe it's not circulating the fluid through the pump just out of it.
If not that then I would look to the Cylinder that the pump goes into. Maybe it's not circulating the fluid through the pump just out of it.
Posting Legend
Joined: Sep 2001
Posts: 30,255
Likes: 37
power steering pump
The pressure relief valve is part of the pump, -so you get another one with each pump.
I would also suspect fluid contamination. Do you have an inline filter installed? A filter is mandated by most pump manufacturers. Check those little pieces of paper in the box that most people ignore and throw away.
Pumps also require that you fill them with fluid and turn the pulley over by hand a number of times to fill the pump passages and lube the seal BEFORE you put the belt on and start the engine.
I would also suspect fluid contamination. Do you have an inline filter installed? A filter is mandated by most pump manufacturers. Check those little pieces of paper in the box that most people ignore and throw away.
Pumps also require that you fill them with fluid and turn the pulley over by hand a number of times to fill the pump passages and lube the seal BEFORE you put the belt on and start the engine.
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