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SAS and engine swap WD21


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#81 OFFLINE   Citron

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Posted 13 August 2017 - 08:09 PM

The problem is with two letters, GM.

That's all I've got.

#82 OFFLINE   daver123

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Posted 13 August 2017 - 08:46 PM

Fair enough. I'm looking at newer pumps than the stock 95 Pathfinder unit. I think the 2004 and older XTerras have a possible donor. They still use a similar PS box to the original Pathfinder ones and their PS pumps might be a good match, possibly new and improved too.



#83 OFFLINE   Citron

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Posted 13 August 2017 - 09:10 PM

I thought the first gen x and wd21 had the same pump, just in a different spot.

#84 OFFLINE   Slartibartfast

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Posted 13 August 2017 - 10:50 PM

What fluid are you running? I know Honda pumps don't work right without their own eleven-herbs-and-spices PSF, maybe GM's the same way. I know both of my friend's 4.3-powered rigs leak take PSF rather than the ATF the WD21 specs. Or, like you said, could just be a flow thing; maybe the Saginaw box that pump was built for has bigger guts and requires greater volume but lower pressure than the Nissan box.

 

I read on here that 94+ OE pumps were better, looks like you found that thread too. I got curious and had a look at some FSMs to see what the power steering pressure is supposed to be. Full lock, engine idling:

 

'89 Pathy: 1,109-1,194 PSI

'95 Pathy: 1,109-1,194 PSI

'97 Pathy: 1,251-1,337 PSI

'01 Xterra: 1,095-1,209 PSI

'03 Pathy: 1,251-1,337 PSI

 

Interesting that '89 and '95 are the same, given the other thread. Maybe they differ in flow, which I see no mention of in the manual. Either way, looks like an R50 pump should be an upgrade. Might even come with a ribbed pulley to match the serp I assume your 4.3l is running.

 

Looking at this thread on Pirate, I'm also seeing some Saginaw P-boxes with higher numbers.



#85 OFFLINE   Cuong Nguyen

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Posted 16 August 2017 - 01:17 PM

Funny, I converted to an xterra pump based on what Nissan nut's experience. Hoped it was worth it. I did take pictures of the internals between the two for comparison which can be found on photobucket

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#86 OFFLINE   daver123

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Posted 19 August 2017 - 08:54 PM

What fluid are you running? I know Honda pumps don't work right without their own eleven-herbs-and-spices PSF, maybe GM's the same way. I know both of my friend's 4.3-powered rigs leak take PSF rather than the ATF the WD21 specs. Or, like you said, could just be a flow thing; maybe the Saginaw box that pump was built for has bigger guts and requires greater volume but lower pressure than the Nissan box.

 

I read on here that 94+ OE pumps were better, looks like you found that thread too. I got curious and had a look at some FSMs to see what the power steering pressure is supposed to be. Full lock, engine idling:

 

'89 Pathy: 1,109-1,194 PSI

'95 Pathy: 1,109-1,194 PSI

'97 Pathy: 1,251-1,337 PSI

'01 Xterra: 1,095-1,209 PSI

'03 Pathy: 1,251-1,337 PSI

 

Interesting that '89 and '95 are the same, given the other thread. Maybe they differ in flow, which I see no mention of in the manual. Either way, looks like an R50 pump should be an upgrade. Might even come with a ribbed pulley to match the serp I assume your 4.3l is running.

 

Looking at this thread on Pirate, I'm also seeing some Saginaw P-boxes with higher numbers.

 

I was doing some parts research on rock auto and it would seem that the 04 and earlier Xterras use a very similar steering box to the first gen pathy's. The r50 uses rack and pinion, not sure how different the flow and pressure requirements are.

 

That or just dig up a 95 pathy ps pump. just thought it would be better to try and rob a newer pump from a 04 xterra.

 

Good thread on pirate4x4 though, I just think I trust the nissan pump more than trying to make a gm pump play nice with the stock steering box.



#87 OFFLINE   daver123

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Posted 19 August 2017 - 08:56 PM

Funny, I converted to an xterra pump based on what Nissan nut's experience. Hoped it was worth it. I did take pictures of the internals between the two for comparison which can be found on photobucket

Sent from my SAMSUNG-SM-N920A using Tapatalk

 

I would like to see those pics but photobucket is dead to me.
 



#88 OFFLINE   Cuong Nguyen

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Posted 20 August 2017 - 05:56 AM

 
I would like to see those pics but photobucket is dead to me.
 

Here is the link: http://s2.photobucke...wersteeringpump

The truck could really benefit from power steering cooler. The reservoir gets really hot that I can't even touch.

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#89 OFFLINE   daver123

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Posted 20 August 2017 - 08:29 PM

Here is the link: http://s2.photobucke...wersteeringpump

The truck could really benefit from power steering cooler. The reservoir gets really hot that I can't even touch.

Sent from my SAMSUNG-SM-N920A using Tapatalk

 

Good reference material. I think I am definitely going to track down an Xterra pump, and get a cooler. Just need some money and time. Maybe next month...

Do you know which year you got yours from and how many grooves on that serp pulley? The 4.3L is 6 groove.

.


Edited by daver123, 20 August 2017 - 08:35 PM.


#90 OFFLINE   Cuong Nguyen

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Posted 21 August 2017 - 08:21 PM

I have no idea how many grooves. I'm guessing 5. The VG33 guys could help you out.

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