NEW P.S. Conversion - LEAK FOUND

[madams557]

Okay, all the pieces are in place and everything is ready to go except a single leak.

I have a 1978 FJ45, using a Volvo 240 Saginaw P.S. pump and a mini truck p.s. gear box.

I had a high pressure hose built at Napa, but the leak that I am having is at the P.S. gearbox. The low pressure return needed a 90' flange bolt. The leak is coming out of the threads of the flange. So, I believe I am either missing a rubber washer/gasket maybe, the flange bolt is the wrong size, or it is the wrong thread spacing. I can't remember off the top of my head what size I got, but it just doesn't seem to thread in there properly, though it seems tight once its all the way tightened. However, without moving the steering wheel, the ATF starts to seep through the threads.

Any suggestions are appreciated.

 

[Pin_Head]

The box is not pipe thread and needs to have a flared tube type fitting. It seals on the tube flange, not the thread. If you really need a 90 degree turn, put a 90 degree compression fitting on the original tube end.

 

[Degnol]

FWIW, the fittings I used are the same for the Saginaw pump and the mini box. The only difference between the Vulva pump and any other GM pump is that "metric" is cast into the housing, indicating that the threaded bosses in the pump are metric in size and threads. The low pressure return line on the box is a bastard size, but the high pressure fitting is the same as the pump. Like I said, FWIW, but mine does not leak.
Don't tug on Superman's cape, don't spit in the wind, don't pull the mask off the ol' Lone Ranger and...don't argue with PinHead.
GL
Ed

 

[madams557]

Pin-Head - I believe I am using a flared tube fitting. I'll work on getting a picture, to see if I have a compression fitting.

Degnol - so if I am understanding you correctly, the high pressure fittings is not the same size as the low pressure fitting? If that is correct, it explains almost everything. I took the high pressure hose in that had one end that fit but the other did not. They (NAPA) made me a high pressure hose with matching ends. It was my assumption that the low pressure fitting coming off of the gear box was the same size, so they gave me a 90' that matched the high pressure side.

You wrote that the low pressure return line on the box is a 'bastard' size, do you by chance remember that size off the top of your head?

 

[Degnol]

Michael
I'm sorry that I don't know what size it is because it came with the box from Woody. So I never had to figure it out. The pressure side of the box is the inboard inlet, make sure you have it hooked up that way.
GL
Ed

 

[madams557]

Okay, now I'm confused. The h.p. connection is the inboard port?? So that is the port closes to the engine block then?? If that is the case, I currently have it on backwards.

I have the h.p. connection in the outboard port, closes to the fender. The reason I did this is when I pumped the gear box, the outboard port appeared to suck and the inboard port appeared to puke out.

If I do have things backwards, I could be SOL on my h.p. hose since the fitting should not fit...considering the l.p. fitting is suppose to be identical to the h.p. fitting, and it isn't fitting.


How fitting!

 

[madams557]

The first picture is the 90' fitting that I was given by NAPA. The second is the picture of the gear box, with the HP hose attached and the LP port (unless I'm wrong and I have these backwards, which in turn will compound my situation).

 

[Degnol]

My bad, the high pressure side is OUTBOARD...towards the fender. That's what I get for using what's left of my memory. I just went out and looked. None of the local hydraulic places carried the metric fitting, but I bet Mr Toyota does.
SORRY for the confusing advice!!
Ed

 

[madams557]

So is it possible that the HP fitting is standard on the P.S. gearbox, while the low pressure return port is metric? Boy, I wish I could remember what size the NAPA guy said that 90' fitting was. Regardless though, I'm sure it wasn't metric. I'm still surprised that the high pressure port isn't metric as well.