TRW p/s pump with big block brackets lines up with rear crank pulley instead of front

[NWCharger68]

Posted this previously on the wrong forum. I have a 68 Charger I've been restoring and converting from a 318 to a 440. I'm almost done and now it seems like everything is fighting me. I have my old TRW pump from the 318. I bought the big block brackets for it and it mounts up fine. The only problem is that it lines up with the rear crank pulley along with the water pump and alt. Does the big block use a deeper pulley on the TRW? From what I've read the Saginaw is a better unit but the prices on them you would think they were made out of gold. This should be lining up with the front pulley on the crank. Am I missing something simple on this? Thanks for any help.

 

[Cornpatch MO]

There are so many variables with all the diffent brackets and pullys. Thankfully I had several pullys , but it still took a lot of trial fit to come up with the right combo.......................MO

 

[miller]

Might research the p/s pump pulleys. Could be different from SB to BB.

 

[furyus]

On the Saginaw pumps, there's a different pulley for big and small block. I don't know about the Federal pumps. It's worth changing to the Saginaw pump. They aren't as leak prone, and you can adjust pressure/steering feel with shims per the Mopar Action article.

 

[Yatzee]

It is my guess that when it came to driving a power steering pump the manufacturers wanted it running off it's own belt, which by the way, was a "B" belt, not an "A" style belt. The belt's cross sections was larger for these pumps, or at least they should be. I also believe belt placement was decided by serviceability. The water/alt belt should wear out first, thus it would be the belt furthest forward. Examine your pulley grooves closely to see if they are the same size - the larger one is for power steering pump and/or AC compressor. You can, with no problem, space your pump forward with the appropriate spacers cut from steel pipe of the right I.D. for the mounting bolts, or, make your own from aluminum round stock. That will put only your pump running off the forward crank pulley groove after spacing the steering pump. Be aware that there may be differences in the diameters for multi groove pulleys and if so, it's best to have the water pump/alternator running off the larger pulley as they present the least load on the engine. In your present configuration I don't think you have enough belt wrap at the crank pulley to prevent belt slippage especially running all three accessories. I run a single B belt for my steering pump with 180 degrees wrap on both pulleys and a double A belt for water/alt because I get only 90 degrees at the water pump pulley, 135 degrees wrap at the alternator pulley and 135 degrees at the crank pulley. Works fine, no squealing and no glazing on the belts. My lower crank pulley is of the three groove type but I have a four groove pulley that's kind of funky with two sets of grooves one diameter and the other two grooves a bit larger. I will eventually use the four groove which will give me the option of using double belts for all accessories.

 

[miller]

Your running a two groove crank pulley. P/S pump normally runs off the front crank pulley groove, driving only the P/Sing.
Too bad there's not good info on all the various pulleys, but your looking for correct pulley offset for the belt groove, to match up with the right crank pulley. LOL! That's a mouthful!

The P/S pulley you have is probably for SB, you need one for a BB, that has a different offset. Also need to get into the service manual on steering, where pump info is. It will give you what you need to know on changing the pulley, and how it 'needs' to be done, without messing up the pump. The pump pulley groove needs to be farther forward, to line up with the crank pulley groove.