So I replaced my water pump with a corvette correct pump for my '77 today. The pump I was using had the inlet at the wrong angle and I wanted it to be correct. The issue I'm having now is that the pump seems to be shorter than the pump I took off. So much shorter, in fact, that when I put the pulley on the front of the pump, it is now too close to the block and doesn't line up correctly with the crank, power steering, or alternator pullies. I'm guessing that I can just get a pulley with a different depth, but I'm not sure which one I need. Any suggestions? Thanks, Neal

 

Whats correct for your car, short or long water pump? I think thats decided by which side your p/s or alt is mounted on?

 

Sounds like you have the wrong pump. This thread outlines the differences in length.

Gary

http://forums.corvetteforum.com/c3-t...ater-pump.html

 

Depending on how much you are off, you can always use a set of water pump pulley shims to push the pulley out a bit. Moroso has a set, and come in various thicknesses. I will admit that it sounds like you have a short water pump, and perhaps everything else on you car is for a long water pump setup. A real easy way to tell what you have for short vs. long water pump, is to look at the gap between the pump and the timing cover. If there is like 1/4", then it's a short pump. If it's more like 1/2"-3/4", and you can fit your fingers in there, then it's a long pump. If you got a short pump and all of your pulleys are setup for the long pump, no spacers are going to fix that, and you will need to get a new water pump. Hope that help!

Deja

 

Maybe the wp pulley & other pullies & brackets are NOT vette parts but from another model??? (did your motor come out of an old camaro etc?) ... or maybe the "vette correct pump" you just tried is not for your year ... or pump not assembled correctly (hub-to-block length wrong). With the pump off & on a bench, you can often use a puller / press to relocate hub on shaft (move yours forward).

*everything on internet's suspect; including the very words I just wrote.

 

Here's how all this started....my motor is not a vette motor and in fact, my car didn't even have a motor in it when I bought it. It also didn't come with any pulleys, fans, or water pumps. The fan, water pump pulley, crank pulley, and water pump I had in the last vehicle the engine was in. The pump inlet was the wrong angle and when in the vette, it was causing the hose to bend sharply. The old pump is a long pump and a smaller shaft so when I put the old pulley on the new pump it didn't fit on the shaft and the grooves were too close to the block. The fan also doesn't fit because the pilot hole in it is too small for the corvette water pump. I am positive that the pump is correct for a 1977 Corvette. So I need a new water pump pulley with the correct depth and correct center hold diameter and a new fan clutch. I'm also going to need the correct alternator bracket because the alternator was mounted to the old water pump and it needs to be moved to the drivers side where it belongs now. It's always something with this car and that something also seems to always have something to do with the cooling system! ARGH!!! Anyway, if anyone has part numbers and/or links for these parts and where I can get them cheap I would be very appreciative. Thanks, Neal

 

I ran into that issue when I did my 383 - I had the wrong pulleys for the water pump setup. I had to replace my crank pulley and my water pump pulley as well as shim my alternator out a bit to match it up.

I'll see if i have the part numbers for you when I get to my work e-mail tomorrow.

 

Thanks Kevin. I THINK my crank pulley might be ok because it is right in line with my power steering pump and worked with the old long water pump pulley. I'm hoping all I need is a new pump pulley, but with my luck it won't work out that way.

 

The non severe duty pump for a Corvette up to 70 has the 5/8" shaft end and is Block to hub----5.625". This is 0.17" shorter than the commonly referred to Corvette pump of Block to hub----5.795"
You might make one work by shimming the pulley and using yor pulley and clutch. The long pump is the only one that has the lower hose angled differently.
The long Chevy pump is Block to hub----6.932"

The 3/4 pilot was also used on several pass cars and trucks, but you will probably simplify things in the long run to change the pulleys to the correct Corvette ones.

 

There is no way to use my pulley. That would be one hell of a shim. I might be able to shim a short pump pulley, but my long pump pulley is just way too deep for a shim. the studs from the fan clutch wouldn't even come through the pump pulley in order to have it at the correct position to line up with the crank and steering pulley. I'll see what I can find i guess.

 

Yes, you would at least have to change the pump pulley.
Don't have the dimensions of a regular short pump pulley, but they are plentiful.

Here is the correct 77 setup

 

[QUOTE=noonie;1573500937]Yes, you would at least have to change the pump pulley.
Don't have the dimensions of a regular short pump pulley, but they are plentiful.

Here is the correct 77 setup

wow thanks! from your pictures, it actually looks like my pump pulley should work. I think my problem is my crank pulley! -Neal

 

while we are here, can you show me a picture of your alternator mounting setup? I'm very concerned here as well as my heads don't have the holes for any brackets. this is becoming annoying!

 

Hope this helps a little, 75 but same mount on the head.
You need new heads Makes it real easy.




Look at this.
http://www.overstockdistributing.com...&cat=0&page=19

http://www.alangrovecomponents.com/S...Short_Pump.htm

 

Ok, here's an update...Summit has a three piece alt bracket that will work with my water pump, holeless heads, and my headers. It'll cost all of about $30 so that's not bad. I called Contemporary Corvette in Bristol, PA. They are a Vette salvage yard and they have a crankshaft pulley and Vette water pump pulley for a whopping $20 each. I will call tomorrow and have them ship me both pulleys and also order the Summit brackets for the alt. Anyway, that's where I am with all of this. -Neal

 

well neal
seems you have a flustercluck & it sounds as though its actually a LONG pump setup. It sounds like your "other vehicle" motor came with a LONG pump ... if not then disregard this post.

If your motor & pulleys & brackets came with a LONG pump ... There is hope ... but changing 1 or 2 pulleys ain't gonna get it. MOROSO & others offer WATER PUMP SPACER KIT to fit between block & pump legs ... converts a short pump BODY to the same length as a long pump BODY ... by effectively lengthening the body's LEGS. That way you can use a vette pump with LONG pulleys & brackets. I have used them on circletrack car w/ no issues. See Moroso p/n 63510.

http://www.jegs.com/i/Moroso/710/63510/10002/-1

However ... in another thread you seem to have cooling problems; IF, IF you have such pump/pulley mismatch I dunno how you could possibly confirm overheating is solved. I raise this because, if you have a gross mismatch & fan blade sets in wrong position in relation to shroud, overheating is likely to return. Electric fan(s) trumps this.

*everything on internet's suspect; including the very words I just wrote.

 

Thanks for your input Jackson. I know for a fact that the last car the motor was in had a long pump setup and that is what my pulleys are for as well. This is not true with the power steering pump as that is Corvette original. I'm curious though why you say swapping out my crank puley and pump pulley to vette pulleys will not let the belt align properly. If my pump is the correct pump for a '77, the steering pump is '77 correct, I will use a bracket for headers and "holeless" heads, and the pulleys are all from a '77 as well, what wouldn't be correct there? I'm not being a smart-*** just wondering if I'm missing something. I also have solved the over heating problem. My issue was having the wrong size hose as GM changed the rad inlet size half way through '77 and I had an early hose and late radiator. The car doesn't overheat at all. I am still going to put the electric fans on it that I have instead of the pump mounted fan. Anyway, let me know if you still think '77 correct pulleys won't do the trick for me and I'll get these spacers instead I guess. -Neal

 

Just for kicks, you might get the GM part numbers off of the pulleys and search on Google to see what they are. I had a weird deal with the setup on my 80, where the PO used a long water pump pulley on a short pump, and had to add washers to the brackets, and after running the part numbers I could see what he had done. Just a thought.

Deja

 

I'll check it out when I get the new ones in the mail. -Neal

 

I changed my pulleys to go with a nice clean look, I got the march performance setup, specifically for the corvette (short pump). Fit perfect. Although i had to get new belts because they are just a little bit different than the stock ones. (no big deal trial and error really). Don't know if this helps you or not (pardon the mess i was mid fix in this pic)