flatlander757's 03 TJ build/update thread - Page 90

flatlander757 · 05-18-2010, 05:54 PM

Quote:

Originally Posted by SaxManClay

It's nice to finally see you do some wheeling with your Jeep. Nice job!

Thanks! Me too haha!

Quote:

Originally Posted by Firedog13

I don't believe I'm aware of these mods

Enlighten me please.

powersteering

Firedog13 · 05-19-2010, 03:37 PM

Haha. I thought it may have a redneck connection to it!

flatlander757 · 05-19-2010, 08:37 PM

So tonight I decided to play with steering pumps... I went to Advance and went through each and every box on the shelf marked as a power steering pump...

Found a lot of interesting stuff but nothing of use to myself.

I was specifically looking for something that met the following criteria:

-CB style pump(not a TC which our Jeeps come with)
-16mm o-ring pressure fitting... so the OEM pressure line would bolt up
-Set up for an external reservoir
-Mounting holes usable on the 4.0... most CB and TC pumps will work but there are a few oddball bolt patterns out there like what come on Pacificas and Audis and stuff.

I already got pump number 20-888, it is factory on a 1998 Olds Cutlass w/ 3.1L engine.

Unfortunately I could not for the life of me find anything in stock that was set up for a remote reservoir so I settled for that pump, I am going to try and mod it to take a remote reservoir... either a press in fitting or tap it for an AN adapter. The most hillbilly idea I've had is to just put a huge rubber hose around it and clamp it, but I fear there isn't enough on there to sufficiently and safely stay clamped on tightly.

The main differences between a TC and CB pump(at least visible to the eye) are that the TC has a sealed bearing behind the pulley(obviously won't see that if the pulley is on there) and the CB has a brass bushing. Also the CB is physically larger in the body than the TC, as seen below:

The only notable mounting issues with this particular CB pump are:

1) the holes are all threaded... stock pump the bolts pass through and bolt into the motor
2) the one hole(middle) doesn't have any material at the back... only the front so obviously going all the way through isn't possible... also due to the hole being so close to the body... it's physically larger than a TC.

My TJ has a bracket that captures the lowest and middle bolt before going through the pump so this works out quite well... I got a shorter bolt(found in my box of bolts... it's the same thread pitch and size as the long ones though)... so I could have the upper and lower bolts go through like normal, and the middle small bolt just bolts the pump to the bracket... still helping keep everything in place:

A closer look at the bracket:

And yes the stock pressure fitting works:

Just for grins I checked to see if the stock reservoir would clip on...

It does... however requires crazy force on the upper clip to get on... I actually had to spread the legs of the clip with my press... I cracked it in the process:

I also had to bend the "retaining tabs" in further to actually catch on the CB pump body so they clips won't shoot off.

Note that the CB pumps have a larger shaft as well, so pulleys won't interchange. TC pumps have a 5/8" shaft, CBs have a 3/4" shaft.

Just for the heck of it I bought the stock pulley for the 1998 Olds Cutlass and it is like 1/8" smaller in diameter than a stock TJ pulley:

My only concern is going to be the offset of the pulley... It is offset in the opposite way(in, not out)... once the pump and everything is bolted down solid I will have to check and see if the new CB pump itself requires different offset than the TC or if I'll have to get a different pulley. I COULD probably install it backwards, only problem is it will never be removable... at least not in one piece. Good thing is the pulley was about $15. Pump was like $80 including the core charge IIRC

Here is the pressure valve that will be getting modified:

I took it apart just for pics, not doing anything just yet though... I'm going to get everything installed and then see how it feels/performs and then do changes in little steps from there.

**LuckRider** · 05-19-2010, 08:46 PM

Sounds like fun. I take it you are using a smaller pulley for more power at lower RPM. That was one of the things Dale and I were talking about that for OBA.

flatlander757 · 05-19-2010, 08:52 PM

Quote:

Originally Posted by LuckRider

Sounds like fun. I take it you are using a smaller pulley for more power at lower RPM. That was one of the things Dale and I were talking about that for OBA.

Not really big enough difference to matter may affect pump RPMs by about 5 per minute... like going from 40s to 39.5s in tires

I just wanted a pulley that would fit the pump and was close to stock size, bigger or smaller that's fine, just close.

You are nearly always the first to respond to my updates... you sir are a master web wheeler

DaleII · 05-19-2010, 08:58 PM

I was here and read the whole thing first, but didn't have anything to say. As goes for most things. I read a lot but don't post.

**LuckRider** · 05-19-2010, 08:59 PM

That is because I have a laptop, and I am on when you post. I happen to be playing Uncharted 2 right now, and I saw the update.

I didn't think the pully would make much of a difference. For OBA, it is supposed to be a 6", but we were talking (ok, I was) about using a 3" pulley to essentially double output.

Edit: I post because I have lots of questions.

flatlander757 · 05-19-2010, 09:01 PM

Quote:

Originally Posted by LuckRider

That is because I have a laptop, and I am on when you post. I happen to be playing Uncharted 2 right now, and I saw the update.

I didn't think the pully would make much of a difference. For OBA, it is supposed to be a 6", but we were talking (ok, I was) about using a 3" pulley to essentially double output.

I think belt slippage would be a big issue with a pulley that small... smallest I'd consider is like 4.5 or at least 5". That thing will draw a lot of power(read: drag) when pumping against 120psi. York OBA is fast as heck to begin with... I wouldn't bother.

**LuckRider** · 05-19-2010, 09:07 PM

Now see... that is the kind of input I was looking for.

DaleII · 05-19-2010, 09:14 PM

Thanks. I wasn't sure on going with a smaller pulley, but maybe just an inch or so. I wasn't too worried about it. They big thing is still the bracket and getting it mounted and aligned.