The Stovebolt Site Forums The Shop Area Engine Shop water pump pulley for 235

I decided to take Jerry's advice and make my own short shaft water pump for my 1962 235 engine in a 1953 pickup. I couldn't find a pulley that suited me, so I pulled one off of an old 216 water pump. That's what was on my old pump. The shaft on my new pump and the old 216 pump both appeared to be the same diameter, 5/8 if I remember correctly. My problem is: the old pulley is a close slip fit on the shaft of the new water pump. So, I need to tighten it up somehow. I'm hoping somebody can recommend a fairly simple method of doing this, hopefully without using a lot of heat on the shaft of the new pump. Any recommendations?

About the only way to tighten up a shaft/bore fit is to get the shaft knurled.
You might be able to do a shade tree version of knurling by using a sharp punch on the shaft to upset some of the metal. The downside of that is you'd need to keep the amount of metal upset the same all around to keep the shaft and the bore concentric.
Or you could use some stud and bearing mount. Link
Depending on how loose your slip fit is, the latter may work just fine.

Patrick's in Arizona used to sell a short-shaft water pump kit with a matching pulley. I don't know what pulley he used and we can't ask him now.

I needed a 2-shiv pulley and used a small-block V8 pulley for the A/C option from Summit Racing. That requires pressing the pulley flange further on to the pump shaft by a little over an inch. With this setup you gain enough room to run a high pitch fan. If you run a big fan, like 16" or so you'll have to drop the radiator so the lower hose will clear the fan.

Running the 216 pulley will spin the fan fast enough to throw a blade off eventually. That can have ugly consequences as happened to my neighbor. Made a neat slit in the hood where it punched through.

That pulley will be way too small unless you also install a 216 or early 235 crankshaft pulley. Try using a pulley from a Ford V8- - - -289, 302, etc. It's somewhat larger diameter than the 216 pulley, and the bolt holes can be drilled to fit the pattern of the flange of the late model pump where the original pulley was mounted. PM me, and I can share some more specific instructions about how to adapt the pulley by either email or phone.
Jerry

Jerry, why not share here so we all can benefit from your vast expertise!

I put a 62’ 235 in my 51’ some years ago. I remember using a water pump from either a 54’ or 55’ 235, as they were the 216 style, and had the narrow pulley I needed to match up with the alternator. I relocated the water pump higher on the block with the adapter kit, I was then able to use I believe a 17”? fan from either Summit or Jegs. I leaned the radiator about a 1/4 to 1/2”? forward in it’s frame, which then I trimmed the very top of the radiator support back that much to slip the whole thing in. To the untrained eye, you can’t tell. I also added a period correct fan shroud from a bigger truck to help.
That was several years ago, a couple thousand miles ago, and even on the hottest days, car shows, drive ins, traffic, or cruising at 60 mph,
she never gets hot, water never captivates.
Not saying this is the way to go, but worked for me.

I've done so- - - -many times- - - -on many subjects- - - -only to be ignored and/or ridiculed. It's simpler to share things one on one with the people who show enough interest to contact me personally. There's a Bible quote about "pearls" that the PC Patrol wouldn't appreciate me using.
Jerry

If one has a lathe handy it's easy enough to spin up an aluminum pully with an interference fit and cut off the front of the shaft as I did for experimentation. Results were mostly acceptable except when sitting in traffic on a hot day as the temperature would creep up.
The 216 pump with adapter plate centered the fan to the rad and worked much better. IMO a short shaft pump is a poor solution.

Jerry, Don't let the nattering nabobs of negativity nullify ... sorry ran out of N words... Spiro was better at that than I.

Anyway, the people who follow your advice are many. And wise they are, too. The ones who ridicule or denigrate or dismiss your advice aren't worth worrying about. Keep posting for your fans!!!

For all, I've been trying over the years to capture Jerry's experience and wisdom in as many Tech Tips as I can. ... there are many to do ....

JM

Well said!