Where's the check valves?

old islander

Petty Officer 1st Class
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Jan 27, 2013
Messages
302
Ok, so I have a 1977 MC1 outdrive. I'm having a problem with the tilt/trim not staying up. I was told the check valves are bad in the pump. This is my confusion.... In shopping for a new pump [old style prestolite] I see they come as the pump and the tank but the valve body that feeds the trim cylinders is not included. This bolts to the bottom of the tank. Are the check valves in that valve body or in the pump/tank set up? Don't want to buy the new pump/tank and find out I needed the valve body that is no longer avalible.
 
Last edited:

wrench 3

Commander
Joined
Aug 12, 2012
Messages
2,108
Re: Where's the check valves?

They are in the valve body in the bottom of the pump assembly. They were prone to corrosion if water got into the system.
Sierra Marine has a replacement assemble for your Prestolite pump part #18-6768. It looks different but does the same job.
 

Bt Doctur

Supreme Mariner
Joined
Aug 29, 2004
Messages
19,092
Re: Where's the check valves?

I might have a valve body, will check tomorrow in the evening.PM me then
 

old islander

Petty Officer 1st Class
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Jan 27, 2013
Messages
302
Re: Where's the check valves?

I might have a valve body, will check tomorrow in the evening.PM me then

Thanks BT. I would gladly buy it from you if you do. That Sierra set up is $700 with shipping...YIKES. I'm really starting to understand that "bust out another thousand" quote.
 

old islander

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Jan 27, 2013
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302
Re: Where's the check valves?

Hello bt doctor, I tried to send you a pm but your mail box was full and it kicked back to me.
 

Bt Doctur

Supreme Mariner
Joined
Aug 29, 2004
Messages
19,092
Re: Where's the check valves?

fixed it, never made it home yet, In the shop Monday, will look and get back to you in a PM
 

old islander

Petty Officer 1st Class
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Jan 27, 2013
Messages
302
Re: Where's the check valves?

Thanks fishrdan, I'll let you know. There sure are a lot of nice guys on this site. Thanks to all.
 

Bt Doctur

Supreme Mariner
Joined
Aug 29, 2004
Messages
19,092
Re: Where's the check valves?

Have it. res. valve body and hose block.
PM me
 
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