Water Pump Pulley

[Greg Gaitens]

I am in need of a (2 belt) water pump pulley to support a power steering upgrade on my '66 cvt. 200 six.

Any advice on where I can find one and/or what years/engine models use this water pump puelly I need is appreciated. Do the 250's and the 200's use the same water pump pulley's.

 

[BIGREDRASA]

In this case, for the pump's sake, you want as small a pulley as possible, an "underdrive" pulley.

 

[Greg Gaitens]

Tony,

The '65 & '66 mustangs used a 5" O.D. pulley. The 289's used a 5 3/4" O.D. pulley. Also, Ford used short and long water pumps. So there are at least two different pulleys out there with different depths. If I get a narrow pulley it is possibble a spacer might bring it out and line them up. But, if I get a deeper pulley the belts will not line up, (crank, water pump, PSD pump.

I think it would be best to find the pulley that Ford used on the car for this application. I could take the water pump pulley off my '66 Fastback, 200 six, running AC and have the right pulley for the job on this cvt. but then I have simply created a problem with the fastback.

I am sure someone out there will have one. It may be the six's with PS are quite rare but '65/'66 Stangs with 200's and AC were a bit more common.

 

[BIGREDRASA]

Can you measure the one you have on the other and ask the seller for dimensions on that one?

 

[Greg Gaitens]

The diameter is 6 3/4 " and the depth is 2 1/2". So I am not interested in this one. Based on the part number he provided it's for a 1965 Ford truck.

 

[rickwrench]

Smaller diameter drive pulleys (dampers) are underdrive, smaller diameter driven pulleys (H2O and everything else) are overdrive. I can see no disadvantage in running an overdrive H2O pump pulley. The HP consumption of such a pulley would be essentially unmeasurable on a 200.

There are interference problems using a later double damper and early stock H2O pulleys (single or double). The late double damper is about 3/8" larger in diameter than a early damper, and that is enough to interfere with the early short H2O pulleys. 3/8" larger is around 5% overdrive. Used with a late triple pulley, the overdrive is about 10% vs the early combo.

The double short H2O pump pulley is a real rare one. I ended up having one made about 10% overdriven. I wanted more than late stock overdrive on the H2O pump since I spend a lot of time with the A/C on in traffic. Flex fan and H2O pump now spin a total of about 15% faster than an early damper/H2O pulley, for better cooling.

Double pulley plans for short pumps

Most here have seen this pic...

It's aluminum and untreated/anodized. Over the last 40,000 miles, it has worn significantly, although over the last 10,000 miles or so the wear seems to have dramatically -decreased-. Go figure.

Other info:
Early H2O pump is 4" base to face, late is 4.75".

Rick(wrench)

 

[BIGREDRASA]

Smaller diameter drive pulleys (dampers) are underdrive, smaller diameter driven pulleys (H2O and everything else) are overdrive. I can see no disadvantage in running an overdrive H2O pump pulley. The HP consumption of such a pulley would be essentially unmeasurable on a 200.
Other info:
Early H2O pump is 4" base to face, late is 4.75".

Rick(wrench)

Nice, Rick. One issue discussed on this and other R&P topic is that the stock pumps overboost the R&P. In that case, an underdrive pulley is preferable for driving the pump. I.E.: smaller drive, larger pump pulleys. However, the size of the water pump pulley won't affect the PS Pump, as it's the cranksahft damper that drives the pump, even if one belt drives both.

 

[Anonymous]

Greg (or anyone),

Why do you need to involve water pump pulley? I haven't been able to find such a double pulley, either. But, I believe there were 2 variations for driving the power steering pump:
- Through 1968 (at least) I believe on the 200 ci eng the power steering belt wrapped around a double damper or pulley bolted to damper (not sure which) then over a double H2O pulley and then over the power steering pulley.
- In later year (like 1982 Granada) versions, the belt was wrapped around a pulley bolted to the damper and then over the power steering pump pulley (the water pump was not involved so you can just use a single pulley on the H2O pump).

Why can't you just run power steering off the crank pulley like in later models? Is there clearance issue?

 

[Greg Gaitens]

pvllm,

I wish I knew. I can't seem to locate any diagrams for how the PS belt was set up. Keep in minde the is a significant difference between the way the PS pump on the 250 vs. the 200. If it were possible to run the PS pump puleey just off the crank pulley this may be an option. When looking at the size of the belt listed for the application of PS on a '66 200 six Mustang without AC, I can tell it is intended to run around the water pump pulley.

 

[BIGREDRASA]

Just run it off the crankshaft, as I plan to do. You just measure the length of belt with the adjustment at midway, and ask the parts store for a Ford belt that length. It needs to be "Ford," because GM and MOPAR use thinner belts.