Water Pump Stud Double Nut Method...What Went Wrong? (1 Viewer)

[ewillis]

So...finishing up the water pump and have these studs to the clutch that came uninstalled. Common Toyota pump with the logo dremeled off and the Aisin sticker applied that's going around. Anyway...search results suggested double nutting the studs to get them on snug. I used the method, but the bottom nut seized! Now I can't get the damn thing off and am buying a new stud and at least one nut.

Should I use a washer between the two nuts this time? The nuts screwed on and off effortlessly until I cinched them together and drove the stud in. While trying to wrench off the bottom nut, it just seized...doesn't seem to be a common problem...maybe just bad luck for me today? Any advice from those who have installed these studs appreciated! Off to the store for now...

 

[2fpower]

wrong thread pitch or buggered threads is my guess. How much pressure are you torquing these things to?

Just did water pump on son's rig and one of the old nuts was wrong pitch, so that would be first guess; however, based on what you said, you would have put it all the way down, double nutted, then was taking it off when it seized.

Try to put a pair of needle nose vice grips on then center section with no threads ( you can hang over to the long side as that is where the fan clutch plate will be), and see if you can back it off.

 

[ewillis]

wrong thread pitch or buggered threads is my guess. How much pressure are you torquing these things to?

Just did water pump on son's rig and one of the old nuts was wrong pitch, so that would be first guess; however, based on what you said, you would have put it all the way down, double nutted, then was taking it off when it seized.

Try to put a pair of needle nose vice grips on then center section with no threads ( you can hang over to the long side as that is where the fan clutch plate will be), and see if you can back it off.

The nuts I used were the original off the clutch, but I I just checked one of them and it gave me resistance halfway through the threads of the new stud...maybe the nuts are buggered and need replaced.

 

[ewillis]

And yes, I was able to drive the stud initially, but it backed out when the bottom nut seized. Just snugly drove it...

 

[george_tlc]

Well, double nuts and gorilla arms can stretch the threads on nut(s)/stud.

Did you have an extra bowl of wheaties the morning you did the job?

cheers,
george.

 

[ewillis]

Well, double nuts and gorilla arms can stretch the threads on nut(s)/stud.

Did you have an extra bowl of wheaties the morning you did the job?

cheers,
george.

I drive an 80 series...of course I have gorilla arms! Curling the 45s twice weekly helps fill out the polo properly and stay on the good side of @zona . On a sad note...my cruiser will now be .004% Chineseum. Unfortunate mistake by me as the studs are not available from Toyota without buying a new pump...

 

[vegansbane]

Wild speculation: Are the OEM studs stainless (I doubt it)? If yes, was the nut too? If that's the case, could be stainless on stainless galling / cold welding

 

[NLXTACY]

Well, double nuts and gorilla arms can stretch the threads on nut(s)/stud.

Did you have an extra bowl of wheaties the morning you did the job?

cheers,
george.

That or he's recently single again

 

[Rifleman]

Wild speculation: Are the OEM studs stainless (I doubt it)? If yes, was the nut too? If that's the case, could be stainless on stainless galling / cold welding

I agree with this post, even if the nut and stud are not stainless, you can still get a type galling if the zinc plating on the stud is applied to thick.

 

[JLH911]

I drive an 80 series...of course I have gorilla arms! Curling the 45s twice weekly helps fill out the polo properly and stay on the good side of @zona . On a sad note...my cruiser will now be .004% Chineseum. Unfortunate mistake by me as the studs are not available from Toyota without buying a new pump...
View attachment 1429550

I'm pretty sure they are, in fact, here they are listed as such:

92122-60860 - Toyota Parts Deal

 

[mudgudgeon]

I'm pretty sure they are, in fact, here they are listed as such:

92122-60860 - Toyota Parts Deal

I'm pretty sure you've got the wrong part number there, not that the OP is likely to care now.

 

[brockdeck]

Id like to point out that it looks like thats not a genuine AISIN pump, there is engraving ground off and a sticker put over it.

 

[jfz80]

Id like to point out that it looks like thats not a genuine AISIN pump, there is engraving ground off and a sticker put over it.

The OP pointed that out as well but its more likely it was a toyota or other mfg casting mark removed. Aisin made the pumps to begin with. Id not worry a bit about it as mentioned its pretty common. Last two ive seen here were the same.

 

[JLH911]

I'm pretty sure you've got the wrong part number there, not that the OP is likely to care now.

Weird. On the main web page it's described as a water pump stud. Toyota uses this stud for different applications, so it'll probably work. I also think I got this p/n from a post by Cruiser Dan. Yeah, the OP may no longer need this info, but others may.

 

[OGBeno]

I'm pretty sure you've got the wrong part number there, not that the OP is likely to care now.

Correct. That is not the correct part number. That part number (92122-60860) is for the actual studs that secure the water pump to the engine block.

The correct stud part number for the water pump studs where they mate to the flange of the fan clutch: 90116-08112

 

[JLH911]

I misread then I think. Good to know they are individually available Now are the Aisin water pumps that have an 'Aisin' sticker on them and 'Toyota' scratched out the genuine thing? I'm thinking they are.

 

[Tools R Us]

I misread then I think. Good to know they are individually available Now are the Aisin water pumps that have an 'Aisin' sticker on them and 'Toyota' scratched out the genuine thing? I'm thinking they are.

The AISIN WPT023 pump appears to be the same pump as what would come out of the Toyota box.

 

[Qball]

What went wrong is you tried to fix something that ain’t broken!!!