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#564509 - 04/27/16 09:11 AM power steering issue  
Joined: Sep 2006
Posts: 2,129
2Suns Offline
Admiral
2Suns  Offline
Admiral

Joined: Sep 2006
Posts: 2,129
Peoria,IL
5.7 alpha.

Last summer I had hard steering. But only real hard one way (can't remember which way) . The other way was easier but not like it should be. Speed didn't matter. I disconnected the steering cable at the control. The cable is free and the wheel turns one-finger easy. I disconnected the drive and moved it by hand. It turns real easy. So that leaves me with the power steering system.



Because it's easier in one direction, I tend to thing the pump is working? I wonder if that actuator is not moving as it should?

I have to fix it this year. It's borderline unsafe. Thoughts from the experts?

Last edited by 2Suns; 04/27/16 09:23 AM.

By the time they had diminished from 50 to 8, the other dwarves began to suspect "Hungry.”-Gary Larson
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#564514 - 04/27/16 04:35 PM Re: power steering issue [Re: 2Suns]  
Joined: Feb 2003
Posts: 11,955
Frantically Relaxing Offline
Admiral
Frantically Relaxing  Offline
Admiral

Joined: Feb 2003
Posts: 11,955
I've never messed with power steering parts, but I'm sure it's very similar to most hydraulic stuff I have messed with-- I would assume there's some sort of shuttle valve, likely the "spool" mentioned in the text. This thing is likely to have o-rings on both sides, and if one of them is leaking, fluid pressure that's supposed to help push the ram that direction won't be present...

If the control valve is rebuildable, it might not take much to fix it, IF parts are available. Might only need an o-ring or two.

Probably not the piston, if it was bad it likely wouldn't give any assist at all.

Just checked ebay, looks like the valve & piston is an assembly, and not all that expensive for used ones...

http://www.ebay.com/bhp/mercruiser-power-steering-actuator

#564518 - 04/27/16 09:43 PM Re: power steering issue [Re: 2Suns]  
Joined: Jul 2003
Posts: 6,715
Dave R Offline
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Dave R  Offline
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Posts: 6,715
Raymond NH
Gotta be the control valve, IMO.


"Mischief Managed II"
1992 Tollycraft 44 Cockpit Motor Yacht
Twin CAT 3208TA inboards
#564538 - 04/29/16 08:24 AM Re: power steering issue [Re: 2Suns]  
Joined: Jan 2004
Posts: 1,834
Lowrider78 Offline
Admiral
Lowrider78  Offline
Admiral

Joined: Jan 2004
Posts: 1,834
Newton Ks
The spool valve.


That streak that howled by? That was me. Did ya like the roostertail? Big Blocks and Jets Forever
1978 Hawiian 20' Bowrider, 454, Dominator pump
1990 Magnum Mach 1 24' Cuddy Cabin Cruiser, 454, Bravo 1 drive.
1993 Suburban 454 tows the Mach 1 to water.
2001 Blazer 4x4 4.3L gets the Hawaiian wet.
#564539 - 04/29/16 09:00 AM Re: power steering issue [Re: 2Suns]  
Joined: Sep 2006
Posts: 2,129
2Suns Offline
Admiral
2Suns  Offline
Admiral

Joined: Sep 2006
Posts: 2,129
Peoria,IL
So I played around with it last night. Turns are equally hard in both directions and are the same with engine running or off. The piston in the control valve does move when the wheel is turned but I don't know if it's moving as much as it should. Now I'm wondering if the relief is hung open a bit and it's not sending enough pressure back there. Didn't want to buy the gauge set up to troubleshoot but might have to.


By the time they had diminished from 50 to 8, the other dwarves began to suspect "Hungry.”-Gary Larson
#564541 - 04/29/16 01:31 PM Re: power steering issue [Re: 2Suns]  
Joined: Feb 2003
Posts: 11,955
Frantically Relaxing Offline
Admiral
Frantically Relaxing  Offline
Admiral

Joined: Feb 2003
Posts: 11,955
If you're getting no help either direction, might just be the power steering pump? Not sure the best way to verify it's pumping without making a mess! idn

#564543 - 04/30/16 12:06 AM Re: power steering issue [Re: 2Suns]  
Joined: Jan 2004
Posts: 1,834
Lowrider78 Offline
Admiral
Lowrider78  Offline
Admiral

Joined: Jan 2004
Posts: 1,834
Newton Ks
OK, since you are not getting power steering EITHER WAY, yes, NOW I suspect the pump itself.

BTW,,,, the pumps fairly easily damage themselves if they are run completely to the steering stops and held there for more than a few seconds at a time.
Power Steering pumps last many years, when not "abused" by jamming them hard over and holding them there.

How old of a boat?


That streak that howled by? That was me. Did ya like the roostertail? Big Blocks and Jets Forever
1978 Hawiian 20' Bowrider, 454, Dominator pump
1990 Magnum Mach 1 24' Cuddy Cabin Cruiser, 454, Bravo 1 drive.
1993 Suburban 454 tows the Mach 1 to water.
2001 Blazer 4x4 4.3L gets the Hawaiian wet.

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