VCCA Home Forums TECHNICAL - GENERAL Mechanical - Engine, Trans, etc 56-235 inot 50 coupe

am getting ready to order the short shaft conversion from either patrick's or mothertrucker (what is truckers website info) seeing that the harmonic balance pulley is thin belt and i suppose the pump will be also what do i do about the wide belt generator i want to keep everything 6-volt will the the pulley off of the 235 12 volt generator work or what will i have to look for to replace the wide belt pulley i now have thanks

If I were doing it I would install the water pump relocation plate and use the old pump and fan. It locates the pump in exactly the same position as it was on the old motor. Some people have overheating problems with the pump in the lower location on the newer style block.

Here is an explanation of the plate that I referred to. http://chev235guy.blogspot.ca/search/label/Water%20Pump%20Relocation%20Adapter

ditto what old216 says. I used the relocation method on my 50 coupe which has the 261 truck engine in it.......and you can buy a new short shaft water pump from O'Rielly's for a good price.

I have heard of several guys that ended up with cracked engine blocks after installing that pump relocation plate, as it requires that you must drill & tap 2 holes through the casting of the engine block to install it.

You will never catch me drilling & tapping extra holes into a 235/261 engine block that already has a well known & documented propensity for cracking .

Use that kit at your own risk.

A SHORT SHAFT water pump for a 235 from O'Riellys ? Really ? No.

In 1955, Chevy began using a larger block opening behind the 235 water pump, to improve cooling capabilities.

This adapter plate uses an opening, just like the old style opening, thereby reducing the water flow, counteracting the design update in 1955.

"With the introduction of 2 new Chevy six cylinder in 1955, General Motors made a change in the water pump that would at least postpone this over-heating problem for many more years than the earlier engines.
Now, the water pump propeller actually was inside a 4” hole in the front of the block. It could move a higher volume of coolant through the block. Chevrolet cars and trucks could now be used so many more miles before this rodding of the tubes was necessary.
With General Motors wisdom, they designed their new high pressure 235 and 261 engine to easily fit in the place of a failing earlier 216 engine. The main problem with this engine exchange was the longer length of the new water pump shaft.
Local mechanics would then either cut some metal from the upper and lower air dam to move this radiator forward a few inches or shorten the pump shaft to provide radiator clearance for the fan on a new 7” pulley."

Most of the replacement pumps they sell are rebuilt, not new & even if you can find a new one from Oreilly's..... it still does not come with the correct 7 '' diameter 235 pulley.

Because of this.... I have seen a lot of people try to adapt the small 216 pulley to the later 235 pump, which is downright dangerous as the 216 pulley is only 4'' in diameter.

The 216 pulley will spin the 235 water pump twice as fast as it was designed for which will result in foaming of the water/coolant along with cavitation of the inside of the pump & impeller.

Not to mention the possibility of fan blades breaking off from running the blade far beyond it's engineered rotation rate.

Both O'Reillys and Rock Auto sell the 55 and up 235 water pump (new) for around $35.00. No pulley and I am guessing it is foreign made. My local O'Reillys has one in stock.

Oriellys/Rock Auto only sell the stock LONG shaft pump.... which is NOT the pump that we are discussing on this topic.

If you buy that long shaft pump you then get stuck with having to hack & shorten the hardened shaft along with having to take your chances with pressing the flange on deeper .
If you are lucky enough to do that without destroying the bearing.... you then get to take your chances on mixing & matching improper pulleys.











The SHORT shaft pump IS the pump that we are discussing on this topic.

Steve, we are speaking of the short shaft pump, not the stock 235 replacement pump.

I questioned achipmunks post, believing he was incorrect, when he stated o' reileys stocks the short shaft pump.

A gent I knew lost his life, when the 216 blade fractured, came off and struck him in the temple, as he worked on his engine.

Made a posting earlier here but then found my sales slip.

EDIT: Double checked and the pump I purchased 30 March 2016 came from O'Rielly's. List price 85 my cost 48.
Part # MWP 58-126 ....I checked and that # is not available there anymore but there are long and short rebuilt pumps at NAPA and listings for 3/8" and 5/8's pulley's. Perhaps this will help someone.

Mothertrucker is selling the short water pumps. Check the for sale items here.

Just checked with NAPA... all that we can find are old Used/Rebuilt pumps on an exchange basis.
Those require that you return your old core back to them, or there is an additional core charge.

https://www.napaonline.com/en/p/WP_58128

https://www.napaonline.com/en/p/WP_58684


Most of the Used/Rebuilt pumps that I have seen from the big national parts houses have castings that are primative .

They are bead blasted to look kinda new, but most are rusted/pitted or have cavitation after 65 years .
{ Who knows how rusted or pitted they are inside where you can't see }.

The problem with these rebuilt pumps is that most guys will dig out the worst nastiest old pump they have laying around
& then turn that one in for a core credit.
The parts houses then attempt to rebuild those old " bottom of the barrel " pumps for resale.





We found NO listings at all from NAPA for the correct 7'' pulley for their used/rebuilt short shaft pumps.


Alvin ...Can you provide us with more info. on the the pulleys you say you have located at NAPA ?

The ones I checked, pump with pulley, show part # for 3/8" pulley is 58126 for $62........and 5/8" pulley # 58125 for $49. Not sure if their web site shows things for all states but in my area I have good luck with our guy who has been with NAPA since graduation in 1965. We have a large "distribution" place in Charlotte N.C. and sometimes parts I need are overnighted from there.

When I looked these up the other night, trying to see which one I used, I think I looked up both the earlier engine and then then the 55 year. Looking them up "by the year" will specify if they are 3/8" or 5/8" pulley ....or they do on the web site here.
At least we given info for those needing a pump. So far I've had good luck with the ones I've put on vehicles.

(the one I got from O'Rielly's may or may not have been new, can't remember, but its running fine)

EDIT: I listed the actual link here MT... but it showed our business/name/account since that is how I look stuff up so it will show our pricing. Anyone can look up what they need themselves and compare to numbers we've listed. Ya'll have a great week.

Check in later guys, wife going back in hospital for two more weeks.

Looks like you might have got your wires crossed Alvin....


None of the used/rebuilt pumps from NAPA you listed will fit a 1955-1962 235 motor { which is what this topic is about }.


NAPA part # 58126 is 216 pump/pulley which not even close to resembling a 1955-1962 235 pump.

https://www.napaonline.com/en/p/WP_58126

NAPA part # 58125 is a 216 pump/pulley which is also nothing like a 1955-1962 235 pump.

https://www.napaonline.com/en/p/WP_58125


.

Probably right MT...... I remember having a time getting it straightened out with the 56 261 engine in the coupe. I used the adapter plate and moved the pump up and used the pump #MPW 58-126 which IS a short shaft pump. I'm running a 12 volt generator and rounded up pulleys to match. I have notes somewhere because of the "mess" I inherited from previous owner.
Again, sorry folks for any confusion... didn't mean to muddy the water with the NAPA #'s....I should have left it alone when I gave the O'Rielly number I used. (The rebuilt MPW 58-126 I believe may still be available on Evil Bay but not certain)

So Alvin, you are saying there is a short water pump, as shown in MT comparison pictures, with the part number MPW 58-126.

Correct or not ?

Trying to clarify your comments here.

I cannot find MPW-58-126 in the NAPA search section.

http://pic20.picturetrail.com/VOL1568/13678754/24528751/413857830.jpg

I also tried to search the NAPA Part # MPW-58-126 that Alvin provided but..... just like all of all the part #'s he provided....
I came up with nothing that is a 55-62 235 short shaft pump that is complete with the correct 7'' pulley .



https://www.napaonline.com/en/search?text=MPW-58-126&referer=search_form-allprod


.

I suspect NAPA's site will show you details based on your geography unless you are in a store having a warm body look in their system.

Both part numbers work in my location but $133 and $166 respectively in Canadian dollars. The pictures look canned so can't tell if its the correct pump or not..

Thanks for researching them from your neck of the woods Tim.


Are they the correct 1955-1962, 235 long or short shaft pumps ?

{ have to ask because everyone seems to think that the 216 pump is the same thing }.



Are they new or rebuilt pumps ?

Are the pumps complete with the correct 7" pulley for either, stock long shaft or shallow short shaft pumps ?

Is there an additional core charge ?

Can you provide the part numbers you entered into the NAPA search engine ?

.

One more time: The NAPA numbers , as stated above are numbers that "pehaps this will help someone".
I stated in the beginning I used MWP 58-126 from O'Rielly's and stated above it is not available there anymore. I can copy the original ticket and post it if anyone wants to see it.............When I noticed that the pump was not available I just went to NAPA to see what they had and posted numbers for all who may want to investigate.

I did a little checking around and although it is rebuilt, as MT states about the pumps we get today, maybe this will work for you?

https://www.carpartkings.com/cardone-engine-water-pump-58-126.html

....and no, it does not have a pulley with it. I found several of the short shaft with a search, rebuilt ones available on Ebay as well but currently out of stock. As MT suggest new ones are nice and he seems to be able to get them. As for the pulley, as MT stated, they do not have the pulleys. I happened to have what I needed laying around my shop when I did my relocation.


I have already apologized for any confusing or misleading info I only wish I had found the receipt before saying anything. I know better!!

I can't speak for MT, but for me, I knew of only two places to purchase the short shaft pump, one being MT, the other being Patricks.

I never had knowledge or experience of anyone else providing these modified pumps.