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Old 06-02-2017, 04:08 AM   #1
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Default Power steering inop

On my 1800sr the power steering went out years back. I've replaced the steering gear, power steering pump (automotive) and checked all the linkages and cables. Basically it steers hard and doesn't seem to be building pressure. I also bypassed the cooler to eliminate the possibility of a restriction. Any help would be greatly appreciated !
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Old 06-02-2017, 10:49 AM   #2
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Have you checked to verify its not the steering cable? Disconnect the cable at the back of the boat and see if the wheel turns freely or not.

By steering gear are you refering to the helm steering system, rack?
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Old 06-02-2017, 11:41 AM   #3
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Have you checked to verify its not the steering cable? Disconnect the cable at the back of the boat and see if the wheel turns freely or not.

By steering gear are you refering to the helm steering system, rack?
No, not the helm rack but the power ram at the transom. During that replacement I checked the cable for free operation and the outdrive for any binding. Is it possible to have the hydraulic lines reversed at the steering ram?
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Old 06-02-2017, 11:51 AM   #4
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No, not the helm rack but the power ram at the transom. During that replacement I checked the cable for free operation and the outdrive for any binding. Is it possible to have the hydraulic lines reversed at the steering ram?
I don't recall if the lines have the same size fittings or not at the ram. The pump end are different.

Did you replace the entire ram or rebuild it?
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Old 06-02-2017, 10:10 PM   #5
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I don't recall if the lines have the same size fittings or not at the ram. The pump end are different.

Did you replace the entire ram or rebuild it?
I installed a brand new complete ram and bled it as much as I thought nessasary. This issue blows my mind b/c it's such a simple system:
Pump>hose>steering ram>low psi return hose>liquid cooler>hose>return pump
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Old 06-03-2017, 12:31 AM   #6
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automotive pumps do not put out as much PSI as the marine pumps
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Old 06-03-2017, 02:01 AM   #7
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automotive pumps do not put out as much PSI as the marine pumps
Is that a fact or a assumption ?
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Old 06-03-2017, 03:02 AM   #8
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Is that a fact or a assumption ?
mercruiser testing manual specs 1150-1250 PSI... typical automotive are 500-700... now that being said you can have the automotive one make the 1150-1250 by replacing the pressure relief assembly (spring) in the pump with a marine one (I would not personally do that with one of the cheap reman auto zone type ones) and you will have the proper pressure
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Old 06-03-2017, 04:40 PM   #9
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mercruiser testing manual specs 1150-1250 PSI... typical automotive are 500-700... now that being said you can have the automotive one make the 1150-1250 by replacing the pressure relief assembly (spring) in the pump with a marine one (I would not personally do that with one of the cheap reman auto zone type ones) and you will have the proper pressure
I'm using a 90's based Saginaw that supposably produces a regulated 1000-1200 psi. I'll just buy a pressure gauge and run through the test plan in the service manual to get more accurate results.
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