1975 Mark 4 Power Steering Pump

[adamfakenamington]

Hey all,

After many weeks of effort, I have given up trying to fix the power steering pump on my Mark 4. Unfortunately, I can't find it for sale anywhere on the internet. The pump is readily available anywhere, but I need it with the reservoir: that's the part that I can't fix.

Parts stores don't have any idea what I'm talking about, places like ebay and amazon having nothing, and even automotive websites like parts geek straight up don't sell this part.

Does anyone know of a website that might sell this part?

Thanks,

Adam

[1Bad55Chevy]

Pump with reservoir on Rockauto.com...

[adamfakenamington]

I must be doing something wrong on rock auto. When I select 1975 Lincoln Mark 4, it does not give me any options with reservoir. Is that for a different year or a different model?

Thanks,

Adam

[adamfakenamington]

I appreciate you looking that up for me, but I don't think that part is for my vehicle. It has one pressure line and one return line. The one for my vehicle has a total of 3 lines, because of the hydroboost I think.

Thanks,

Adam

[1Bad55Chevy]

I looked it up for a 74. Notice the part number for the actual pump without hydroboost is the same for the 74 & 75. If the reservoir looks the same as what's in your car I would assume it to be the same.

[adamfakenamington]

The reservoir in my car is for the hydroboost, it has 2 return lines. That part on rock auto is not for hydroboost, it only has 1 return line.

[adamfakenamington]

As far as I can tell, rock auto doesn't offer any reservoirs for hydroboost for 74-76.

[1Bad55Chevy]

I appreciate you looking that up for me, but I don't think that part is for my vehicle. It has one pressure line and one return line. The one for my vehicle has a total of 3 lines, because of the hydroboost I think.

Thanks,

Adam

Ahhhh... I didn't know it was hydroboost.

If you can't source a reservoir I wonder how hard it would be to put a normal vacuum booster on it..

[beaverbikes]

I got one with res from rock several months ago, even sent back my core. The rebuilt one was from Lares, maybe check with them?

[LithiumCobalt]

Can yours be rebuilt? I sent mine out and had it completely restored. Wasn’t too expensive.

[adamfakenamington]

Where did you send it to be rebuilt? If that's something I could do, I'd definitely go for it. There is pinhole leak somewhere on the back of the reservoir, and I've tried 5 times to seal it with no success. I've used various epoxies rated to up to 3000 PSI, but no matter what I do, it still leaks.

[Dan Szwarc]

You can merge the return lines into one as they are low pressure,.

[Lee]

There’s no pressure on the fluid in the reservoir. I’d be afraid that if you sent it off to rebuild, they’d only clean the reservoir, and you’d get a rebuilt pump (which you don’t need) and a still-leaking reservoir.
If you haven’t pulled it of the car, clean it up real well with something that will emulsify oil, roughen the area with sandpaper and then try epoxying where the leak is. Epoxies don’t stick well to a slick or oily surface.

The leak may be where the fittings are brazed to the case.

[adamfakenamington]

I've pulled it out of the vehicle 5 times now, stripped it down with the wire wheel, cleaned thoroughly with alcohol, and used different epoxies and resins. I've put so many hours into it that I've completely given up on fixing the leak myself.

What's crazy to me is that no one sells that reservoir. I'm just not sure what my options are at this point.

[Dan Szwarc]

I have a spare pump on the shelf, never used. No reservoir.

Junk yard time, dude!