Power steering pump

rasbury

Is the pump a standard gm pump for a 270 350 mpi? I think I toasted mine with the line that leaked the fluid...

Black_Diamond

Should be. 

Ian

I believe so. I did the same on the port engine a few years ago. Found a remanufactured one via Amazon and has been fine. Found others on eBay also, just pump , reuse the reservoir 

rasbury

@icoultha not sure I get the comment of " pump only" - doesn't it all kind of come together? I was shocked looking at oem new...what are they thinking? Any clue on figuring out the gm part number? You go into an auto parts store with a part and they look like a deer caught in the headlights.....

reneechris14

Looks like the pump it self is $40ish bucks. 

Ian

@rasbury I also was shocked when I used the Mercury parts site with my serial number and looked at the OEM part number then looked up the price - $4-500 if I recall. So I then searched around and found this https://www.amazon.com/gp/product/B012DWJYSG/ref=ppx_yo_dt_b_asin_title_o09_s00?ie=UTF8&psc=1 (and others) with lifetime warranty for $150. At the time they were in stock, very helpful and shipped out the rebuilt unit. I called as I heard a slight squeak at low revs, he suspected the pulley was not quite home and the belt was tweaked slightly. Sure enough, it was slightly out compared to the starboard one and with a pulley tool, pressed it back a  little and no more squeak. The unit comes just the pump, you take of the reservoir can and put into the pump as it is perfectly okay.

Punch you serial number into https://www.mercurymarine.com/en/us/parts-and-accessories/parts-catalog and get down to the pump part number then search Amazon/eBay or your favorite boat-parts-where-we-wont-rip-you-off.com

rasbury

I looked on both sites I normally look at ( including the one above) and do not see a part number for just the pump itself, only the asy. I need to get down there and get a better look and see what is going on....I don't think it is as simple as a hose unfortunately! Never seems to be that simple for me anyway...

Ian

What’s your serial number first few digits?
If you lost all fluid and it ran dry the pump likely is stuffed. 

Ian

What’s your serial number first few digits?
If you lost all fluid and it ran dry the pump likely is stuffed. 

davidbrooks

@rasbury I have been dealing with this for the last year and have pulled my PS pump at least 5 times.  First time it died i pulled it.  Then discovered that there are several options to repair.  The easiest and most expensive is to go OEM.   That will run you $600 to $1000.  There is the pump, the reservoir and the pulley.  The pump is all you need.  You can purchase a replacement or rebuilt pump for $100.  You will need a pulley puller. There is a thread on here about it.  I used a loaner one from AutoZone but it caused issues.  The process of pulling the pump is pretty straight forward but the press requires the threads to be tight.  I ruined two because of stripped threads in the pump shaft pressing it back on.  Second big tip is to take a photo of the old one and measure how much shaft is sticking out before you pull it.  If the new one isnt pressed on to the same depth your belt will work its way off the pulley under WOT.   Had that happen also.  When you pull the old resevoir off you will want to reuse the pressure valve and spring.  Looks like a metal piston under the bolt for the High pressure line.  Just toss the one that come with your replacement pump.  After you get it put back together on your bench plug the outlets and fill it with PS fluid.  It is a lot easier to check for leaks on your bench than leaning over your engine.  Trust me.  This was pull number 3 or 4. Getting a seal on the bolts that hold the reservoir in place is tricky.  Look for a replacement PS Pump that comes with new gaskets.  For Example....https://www.amazon.com/gp/product/B07731SBFW/ref=oh_aui_search_asin_title?ie=UTF8&psc=1 

Other than that it is a piece of cake.  

rasbury

Thanks all.....My serial number is ow038097. This is all great info and I appreciate it. Admiral about had a cow as I left up the site showing the 700 pump....I need to get it pulled off and see where it is leaking. Heck it could be blowing up from the cap, I checked it and it seemed to be on there tight....resolving another issue and will get that pulled off/inspected this week. I was on the boat by myself....and low rpm it did not make and noise. Give it any gas and it starts to make noise- I don't think it was the belt....I had the hatch open and it looked like when I gave it the gas fluid was shooting out the bottom. The power steering itself is still working so I guess the pump is still functioning....?

Ian

Zero W - no wonder it wouldn't come up!
 I agree with most of what @davidbrooks said although I had no issues pressing on the pulley - once I homed it fully that is as mentioned above. I bought a pulley puller from harbor freight that was useless; also rented form Autozone and no issues at all. I had to change over the valve and spring also, forgot about that, the pulley challenges blanked everything else out.

Mine also was a hose leak and hard to find but it became obvious once topped up and run and even though the pump seemed to work, the advice was if it went dry the bearings/seal won't be happy. While this was on my port engine and therefore not actually doing anything but pumping fluid around it may have lasted but I wasn't taking a chance. Under a load you may see a different result later - and you've had enough issues already Ras.

According to Merc part number 16792a39 for the assembly at $756 - a bargain for someone. I punched in 16792a39 on Amazon and got amongst the various Sierra and apparent QS offerings a rebuild at https://www.amazon.com/Part-Tool-LLC-Steering-Mercruiser/dp/B07731SBFW/ref=sr_1_2?keywords=16792a39&qid=1553609394&s=gateway&sr=8-2 

Hope this helps.

rasbury

It does....I will get it pulled out and see what is going on....I'm sure missing out on some nice boating weather for sure....

212rowboat

you want a used one? 
PM me your addy.  Was working fine when I yanked the engine.  two to choose from, so take a pic of yours... low left or high right?

rasbury

  wow 212- that's awesome! I will get a picture of it..my motor is a 350 2006 MPI but I'm guessing there are not a lot of variables..I recall you replaced a motor....does it come turn key or would they not transfer stuff like that from old to new??

Stodge

One nice thing about twins.  I had the "working" pump on my 280 die years back. I just swapped it for the "dummy" on the other engine.  Did the trick.

Ian

True and why I decided to change it out. Knew I had a working backup if needed.

212rowboat

rasbury said:

  wow 212- that's awesome! I will get a picture of it..my motor is a 350 2006 MPI but I'm guessing there are not a lot of variables..I recall you replaced a motor....does it come turn key or would they not transfer stuff like that from old to new??

it comes down to hoses and crimped fittings... one style is located high on the engines accessory drive, the other low on the accessory drive... and one style is mounted on the starboard side.  other than that i'm not sure it matters. 

rasbury

I took a look but could not get any good pictures....it is starboard under the oil filter...both hoses connect at the bottom. I'm going to fill it and see if it leaks sitting there...hoses do not seem wet, face around the shaft seem wet. I will clean it up, take the belt off and spin it and see if it will show where it's leaking....