In need of 401 v6 water pump
 

Hello,
I am new here, and I hope this is the right place to find some answers. I have acquired a 1955 Kenworth Pacific bus with a 401 GMC V6. The only thing wrong with the bus is a water pump that has seized. After searching far and wide, I realized that no one seems to know where to find a new or rebuilt one. To make things worse, the shop that I gave the old pump to lost the original! I am screwed if I can't at least find another old one to have rebuilt. Please help.

-Dan

Re: In need of 401 v6 water pump
 

Since it is a bus, is it a rear engine or front ?
I have a 1970 RM-7500 which is a rear motor (401M) school bus chassis, converted to an RV.
I had to replace a Water Pump many yeas ago, while on a trip east, and had some trouble finding the correct one. I had the old pump with me, so at least I had something to compare.
There were three options as I recall, and they all had to do with the length of the impeller shaft. All had the same bolt pattern, but I think the flange for the pulley was extended a bit on the one I needed.
I have the air brake pump setup on mine, and that may be the difference, even though the air pump belt does not run across the water pump pulley.
I have looked, but do ot see any record of a part number for that replacement pump i purchased.

Rod Johnson
Issaquah, WA

Re: In need of 401 v6 water pump
 

Yes, it's a rear engine vehicle. It's just the 401 without the M though. Someone has to know where to get one, or possibly could sell me an old one, I hope.

Re: In need of 401 v6 water pump
 

Dan,
I do not think the 'M' designation would make any difference for water pump, but the front cover for the bigger motors may a bit different. I think one puts the water pump higher on the motor, but don't quote me on that. I seem to recall a discussion some time ago; about when putting a motor from a larger series truck into a pickup, the front cover may have to be swapped out, for the water pump to be in the correct location for the cooling fan shroud on the radiator (on the smaller trucks). I may be hallucinating, but I seem to recall something like that. I do not know just what the difference is, or maybe it was related to the difference in timing gears vs. timing chains on the bigger motors....Again, don't quote me. <grin>
I have two 478's here, in the garage, with no belts on them, and the 401 in the motorhome. If it comes to that, since you are fairly close to me, you could 'borrow' one of my water pumps to try, and then get one to match it. It comes off without disturbing the housing (6 bolts or 8?) , so it would not be much trouble.
Rod Johnson
Issaquah

Re: In need of 401 v6 water pump
 

If I can't come up with another one, I would not mind trying one from a spare engine if you have one. If it fits, I might have more options on potential vehicles to pull a pump from. I see a 305 on craigslist in maple valley for only $60, but I don't know if the pump will fit.

Also I need to move my bus to a spot for the winter, only a half mile, but I have to install the pump and pulley to move it. Maybe I could use one of yours for a day if it fits? Thanks for the info.

-Dan

Re: In need of 401 v6 water pump
 

Dan
I looked at the "known part number" section of Jollys page and got NAPA 55-835.
That didn't show up on NAPA's website but a Google search came up with the following cross reference numbers;
Gates 42099, GMP 130-2835, ASC WP 371, Borg Warner P450, and Carquest 51-1513.
I looked at the rendering of the Gates and it looked like the 305 pump so Im not sure if its the correct pump, but might be a place to start.

Re: In need of 401 v6 water pump
 

nwdan. is your bus air brake equipped? the air brake equipped 401 has a threaded pump shaft with a cast iron pulley. those pumps are available. thx

Re: In need of 401 v6 water pump
 

Our 47 has air brakes and the 401.

Re: In need of 401 v6 water pump
 

Tommr do you have the part # sounds like the pump on my v-12

Re: In need of 401 v6 water pump
 

WE7X: The part number you gave me for napa is correct: 59-8146. They don't have one anywhere in the nation though, so I'll need a core to send in to be rebuilt. Now I have to find one in a junkyard.

tommr: Do you know of another place that might have one?

Re: In need of 401 v6 water pump
 

WE7X: The part number you gave me for napa is correct: 59-8146. They don't have one anywhere in the nation though, so I'll need a core to send in to be rebuilt. Now I have to find one in a junkyard.

tommr: Do you know of another place that might have one?

Thanks.

Re: In need of 401 v6 water pump
 

Dan,
I see it listed at Advanced Auto parts by that Cardonne part number, and also on Amazon.com. Neither shows it out of stock

Rod J
Issaquah

Re: In need of 401 v6 water pump
 

BTW, my bus is air brake equipped. If you have a link to the part, please share the link. I cannot find the part anywhere after months of searching. If you know of a place that has it in stock, please provide a link. Thanks,

-Dan

Re: In need of 401 v6 water pump
 

Does your pump have a threaded shaft or a flange with 4 tapped holes?

Re: In need of 401 v6 water pump
 

It is threaded. The part number that WE7X gave me shows the right unit: http://www.napaonline.com/Catalog/Ca...146_0412425179

As seen on the above link. Thanks

Re: In need of 401 v6 water pump
 

hey dan. another guy was asking about an air brake pump back in may 2014. search this site using key words-- water pump air brakes-- there are part# in that thread. just start googling those #s. when you google some of the search results will be from yoyoparts.com and kakaparts.com. while those 2 sites don't actually show the part for sale they do serve as an interchange list with more part #s. just start googling those #s. im sure these dry up at some point but you should be able to turn one up. good luck tom

Re: In need of 401 v6 water pump
 

I might just have one. Give me a day or two to find it.

Re: In need of 401 v6 water pump
 

Oh PLEASE have one! lol.. I am trying not to get discouraged, but finding this waterpump has been like finding the fountain of youth for me. Any help is greatly appreciated. :)

Re: In need of 401 v6 water pump
 

dan im seeing lots of google hits on these #s esp WP 59-8146. unless you are finding they don't actually have them. you would think one of these guys would have one to ship. Amazon even has that #. tom

Re: In need of 401 v6 water pump
 

All of the parts websites have it on file, but you can't check to see if it is in stock online. Napa shows it on their page, but the guy at napa checked their computers and showed no record of one anywhere in an affiliated store in the US. I see the part on Advance's website, so I will go and have them check records, but I have a good feeling it will be the same case. I also ordered one online once and it was the four-hole style pump and did not fit.

Re: In need of 401 v6 water pump
 

Dan amazon is showing 1 in stock--WP 59-8146. there are 6 or 7 parts #s for this pump. are you googling them all?

Re: In need of 401 v6 water pump
 

carpartkings.com shows it available for $70 w free shipping. mypartsgarage shows it as available. summit shows it also but say ship by 12/9

Re: In need of 401 v6 water pump
 

I searched the forum for "water pump air brakes". Found the appropriate posts, but did not find another part number that comes up with anything on google. I tried to find one at carpartsking.com just now as well with no search results... If you can post the appropriate link, I will order it now. If they are that easy to find, I fear I might be stupid. ;) Please link me up to a page that has the part so I don't have to go through search number 5,000... I am discouraged from all the blank and bad search results, even though I search what you guys recommend.. Thanks again!

Re: In need of 401 v6 water pump
 

I need one for my v-12 too no one has one checked everywhere, you have to send yours in to be rebuilt. I don't have an extra core, but if i see one i will let you know.

Rick

Re: In need of 401 v6 water pump
 

AMAZON SHOWS 1 IN STOCK PICTURE LOOKS RIGHT ENTERED 59-8146 AND IT CAME UP

RICK:upyes:

Re: In need of 401 v6 water pump
 

dan as per my prior post you have to go to google and type in WP 59-8146. also try it without the WP as that letter code may not be used by all the vendors. carkart.com has them too. im seeing 8-10 of these and that is just on a search of this #. there are multiple part #s for this pump so I would exhaust this # first. im sure some of these guys will have actual stock on this. I would not tell them you don't have a pump for core. just pay the core charge up front. the Cardone pump is a piece of crap. my first pump lasted 3 weeks and 3,000 miles. dumped all the coolant out of the weep hole on the PA TPK on a 100 degree day. don't know what your plans are for the bus but it would be a good idea to buy a second pump, disassemble it and get the #s off the bearings and seals. then you can build a good pump using USA bearings and seals. huge difference in USA and off shore tolerances and probably the actual material too. same goes with hub and wheel bearings. very significant differences in the fit btwn USA and off shore. tom

Re: In need of 401 v6 water pump
 

I checked NAPA too, and they don't show any in stock at any store or warehouse.

Re: In need of 401 v6 water pump
 

I have a usable water pump off a 305E V6 that's just siting around. It's a four hole one if you think you can use it??? Ross.Hodges Durham, NC '66 GMC with 12' flat bed '72 GMC dump truck.

Re: In need of 401 v6 water pump
 

I found a NOS Airtex AW 5005. Send me a P.M..

Re: In need of 401 v6 water pump
 

Guess he doesn't need one anymore?