The Stovebolt Site Forums The Shop Area Engine Shop water pump

ok guys need help, i have a 52 chevy 1ton truck 3800 series.my bely is squealing real bad. The crankshaft pully and altenator [i put altenator on instead of generator] is smaller then water pump pully. My friend thinks it is a 235 motor. all numbers says it is a 261 1954 motor. i really don't know but my question is where can i find a pully for 1954. and r the 235 and 261 same pully. here is a few pics of motorpullypullypully

motor numberhttps://photos.app.goo.gl/zYqYnHJS7QmghrDP7

motor number 3733950

Where did the the crankshaft pulley come from? If it is original, it should be for a 5/8" belt. Are you certain that it is for a 5/8" belt? Your water pump looks to have a pulley for a 5/8" belt. If both of those pulleys are for a 5/8" belt, then you need to buy a 5/8' belt and change the pulley on the alternator to a 5/8" pulley.
Now if the crankshaft pulley isn't for a 5/8" belt, then you may have to buy a '53 water pump which comes with the narrower pulley. I don't know where you will find just the pulley. Even if you do, it is a bear to get the old one off and the new one on. The water pump costs $129.95 at classicparts.com. Who knows, maybe yours is about to lose a seal some time soon anyway. Easy fix.
Carl

the crankshift and aterenator r the same. the water pump is bigger. they were part of the truck when i bought it

It looks like the balancer is for a 3/8" belt.
So as Carl says, you just need a 1953-54 pump, which comes with a 3/8" belt pulley.

Carl, can u tell me for sure whether its a 235 or 261 motor

jimbo 24,

Please provide the codes that you find on the photos on this page.
http://www.1954advance-design.com/Web%20images/casting-code-photos/codes-ser-nums.html

If you want to post photos of those codes, please also post what you think the codes are (as numbers/letters - some photos are hard for use to read/guess).

The CON3 code you posted is not useful - it indicates that the head travelled on CONveyor #3 in the head factory.

If the block casting code is 3733950, that code was used in 1955-1957 on 261 truck blocks (USA).
The block and head date-casting codes will ID the year in which the block and head were cast.

The code pressed into the block behind the distributor (Engine Serial Number) usually IDs the year and size of the truck in which the engine was installed.

more numbersnumbers
on the headhttps://photos.app.goo.gl/JFnMzWr9h7ds8c267
https://photos.app.goo.gl/CU5kcQV96tyDpBRR8
https://photos.app.goo.gl/1E9Ao7tEKybmceY66
https://photos.app.goo.gl/UasiK4Fwc33t3vya9

sorry on the headhttps://photos.app.goo.gl/U5bJGK23SSRFMTJn6

on headnumber

Looks like all those codes are from a block?

950 = ??? (I have never seen a meaning/translation for that type of code : I have seen 850 and 950))

CON4 = CONveyor #4 in the casting plant

J 19 0 = block casting code
J = 11
19 = 19th
0 = 1960 (if it is a 261, or a high-pressure 235) -> from an earlier post, it is most likely a 261

First link are codes on the side of the head:

It is not in the location of a head date casting code, and not in the location of a head casting code.
Those two codes are under the valve cover (as shown on a page that I linked-ton in an earlier post).

If I am incorrect, someone will post a correction.

3836850

That is the head casting code: for all 261 USA truck engines.

ok thanks Tim. Now back to my first question, do i need a 3/8pully with water pump

I like all the pulley grooves to match: 3/8, or 1/2, or 5/8ths, or etc

However, some people have posted/recommended that you can use the smallest size for your combination?
That might not work in a wide pulley - the narrow belt might "ride" on the bottom, not on the sides?

Wait to hear from others.

thanks guys, appreciate it

Carl, u said the crankshaft pulley should be 5/8 for 261 motor. correct/ then i will change my alternator and water pump pulley to match. what do u think?

What pulley size is on the harmonic balancer?
What puller size is on the generator?

It looks like the pulley size on your water pump is wide - 1/2" or maybe 5/8"

The standard generator in 1954 used a 3/8" pulley (even on 261 motors - it looks like that in parts manual).
The optional higher-rated generator in 1954 used the wider pulley, maybe 1/2" or 5/8" (as shown on your water pump).

Do all of your pulleys seem to have the same size grooves?
If yes, the wider pulley should be correct?

http://chevy.oldcarmanualproject.com/parts/1929_54
http://chevy.oldcarmanualproject.com/1929_57

no they don't. the crankshaft pulle that is why i wanted to know correct size crank pulley for 261.y and alternator pulley r the same. water pump is bigger. that is why i get all the squealing.

Unless you have the engine out I wouldn't worry about the crank pulley.
I would just put a 1953-54 pump on it and be on your way.

thanks so much