Power steering pump fitting question.

BOJANGLES

Its alright.
#21
That fitting you have circled is just pressed in. On my hybrid project, I simply pulled it out and tapped it 1/2" NPT. Easy Peasy
I’m going to tap this pump npt, I can’t seem to find the correct size to tap the hole on the reman pump I have. Hole measures 3/4” and my 3/4 npt tap is much to large. What am I doing wrong here? I would think 1/2” would be way to small unless NPT taps run different in sizes?
 

earlbrown

runs with scissors
#22
NPT is pipe thread. Which means you're tapping a hole to install a pipe that has that size as an I.D. It's not like bolts that are numerically sized for the actual threads.

In other words, a 1/2 pipe is a 1/8 wall would have an OD of 3/4. So a 1/2NPT tap would be sized for 3/4 hole.

On a side not I'd do two things before you go through a bunch of BS modifying that pump. Once is to make sure the ID of whatever fitting you're wanting to install is as least as large as the nipple you're replacing.

Second is to test that exact pump under real world use to make sure it's up to par. Aftermarket pumps have a very high success rate of not being able to to handle steering and braking.
 

BOJANGLES

Its alright.
#23
NPT is pipe thread. Which means you're tapping a hole to install a pipe that has that size as an I.D. It's not like bolts that are numerically sized for the actual threads.

In other words, a 1/2 pipe is a 1/8 wall would have an OD of 3/4. So a 1/2NPT tap would be sized for 3/4 hole.

On a side not I'd do two things before you go through a bunch of BS modifying that pump. Once is to make sure the ID of whatever fitting you're wanting to install is as least as large as the nipple you're replacing.

Second is to test that exact pump under real world use to make sure it's up to par. Aftermarket pumps have a very high success rate of not being able to to handle steering and braking.
Much appreciated information. Not much of a hassle doing this to the pump I was just having some issues with sizing the correct tap, as from what I found which wasn’t through extensive searching I was only finding reman pumps for our cars and I came across 1 that was pretty pricey. Any suggestions? I’m basically just trying to stop the leaks and get some of this whining under control since my hydroboost install. Pump was quiet for a while and started to get noisy slowly again and brakes are a little funny too but stops very well. The pressure lines are all AN I believe that came with the kit but when I looked it seems like the feed hose from the reservoir to the pump was leaky and figuring air was getting sucked in as well. So trying to eliminate that and move on to the next.
 

earlbrown

runs with scissors
#24
My advice it to go vacuum, but I know how hard it is to abandon something you're already deep into.


From what I've read the current supply of pumps just aren't rated to handle the additional load from braking.

At least with vacuum, you always know it's there on decell.
 
#26
i looked at the vacuum set ups and ended up going to h.boost, i modified a reservoir from TR parts and added a separate return and also a cooler to slow the flow down, it works but i just think i have a leaky return hose which is sucking air, i also believe i removed the factory pump and feed hose so i think its time for a upgrade. i got a tap coming today and going to hit the parts store for some JIC fittings and try an get this thing buttoned up. on the next note i need to go in a tighten every intercooler bolt and bracket...... anyone have a front mount IC laying around willing to part for cheap? lol worth a try anyway.... would like to clear up some room in the front of this motor and stop tightening these bolts every damn day...
 
#27
That fitting you have circled is just pressed in. On my hybrid project, I simply pulled it out and tapped it 1/2" NPT. Easy Peasy
What brand or type of tap did you use if you remember. I got a 1/2 npt Tap tapered and with the taper it only put in a few threads and bottoms out on the little sleeve that’s in that hole...
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