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I replaced my water pump in my car and everything looked like it matched up until I just tried to put the pulley back on. The input shaft on the new pump is just barely larger than the old one, not sure why but I didnt check this before installing it (I know stupid on my part but I never thought about it considering everything else matched up.)
Anyway, do I:
1. Drill the hole larger on my old pulley and just mount it on
2. Search for an buy a new pulley to match the new hole? Old pump with smaller pulley pulley hole New pump with larger pulley mount rod
Not much but I also just measured the distance in the four bolts and they dont line up either so I guess I need a new pulley. Im not sure how I find one that will fit with all the right dimensions.
It seems you didnt take the advice that you asked for in the other water pump thread you started asking if they were all the same. As was mentioned there multiple times, the corvette water pump is a specific water pump. You will likely need to change more than one pulley or add shims to line up now. I found this out the hard way myself and I had to do the same when I bought a polished water pump.
Last edited by augiedoggy; Jan 10, 2021 at 12:40 PM.
I understand what your saying about a Corvette specific pump but that also assumes that my car has a stock Corvette motor and not the 350 crate thats in it. I cant just go off of make and model to find parts so it can be a little challenging.
Yeah, so I pulled off the new pump and Im going to return it. Ill take the old pump with me this time when I go and find another pump.
I understand what your saying about a Corvette specific pump but that also assumes that my car has a stock Corvette motor and not the 350 crate thats in it. I cant just go off of make and model to find parts so it can be a little challenging.
Yeah, so I pulled off the new pump and Im going to return it. Ill take the old pump with me this time when I go and find another pump.
almost all Corvette engines were used in other models. The trouble is in the accessories. The water pumps were both short and long. You got the wrong one. Think less listen more always double check.
You were told by many members in the other thread you started to NOT change the water pump and that your low speed overheating issues were caused by not having a fan clutch, wrong fan, no seals around the radiator and possibly retarded ignition timing. are-all-water-pumps-for-a-350-the-same
I understand what your saying about a Corvette specific pump but that also assumes that my car has a stock Corvette motor and not the 350 crate thats in it. I cant just go off of make and model to find parts so it can be a little challenging.
Yeah, so I pulled off the new pump and Im going to return it. Ill take the old pump with me this time when I go and find another pump.
Going by the layout in your photos in the other thread. It appears even though your block may have been replaced, that all the accessories where moved from the original (except rad clutch and fan the fan appears to be something from a 40s or 50's era engine).. Most of the aftermarket setups I see arent laid out the same way as the c3 so this and the photo of the stock WP and pully are indicating it as well. your alt looks to be updated as well.
Last edited by augiedoggy; Jan 10, 2021 at 05:28 PM.
From: At my Bar drinking and wrenching in Lafayette Colorado
Corvette water pumps have 3/4" diameter pilot shafts, and the Corvette engine has a 3/4" hole in the water pump pulley. Standard short Chevy pumps have 5/8" shafts, and are used with passenger car engines with pulleys having 5/8" holes.
Everybody told you not to change the pump, but you did it anyway. Why are you asking for advice when you don't want the advice..?
Run Jd21476. RUN !!! They are rounding up the horses and forming a posse. One of them has a noose for lynching.
Whoa, easy there big fellas.
Geeez guys. Its not like he just got back from Washington, trashing the Capitol.
He just asked a simple question, . . . . . . . . . . . . . . . . twice.
Run Jd21476. RUN !!! They are rounding up the horses and forming a posse. One of them has a noose for lynching.
Whoa, easy there big fellas.
Geeez guys. Its not like he just got back from Washington, trashing the Capitol.
He just asked a simple question, . . . . . . . . . . . . . . . . twice.
You rebuilt your old pump with new bearings? If so, I hope you used a press and supported the "nose" of the casting.
I realize you already solved your issue, but in case others are reading through this:
The size difference in the hub shaft is something you have to be very aware of when changing Corvette water pumps. Early C3s had a 5/8" shaft and pulley bore. Somewhere around 1971 or so the shaft increased to 3/4" for some Corvette engines (maybe all – I'll defer to others on this).
Last edited by barkingrats; Jan 10, 2021 at 08:19 PM.
What we see here is that the OP has a crate motor in the car. At that point all bets are off as to what is the correct water pump. Maybe a Corvette water pump was installed, maybe not. If the block came with a water pump and pulleys, then who knows.
Telling him to get a Corvette water pump is not going to help if that is not what was used on the new engine.
If however, the previous owner pulled the water pump off and installed a Corvette pump so that his Corvette accessories and pulleys would lineup, then yes he should follow recommendations.
But again we don't have any info on what the water pump is that he has now rebuilt. I think he should find out what it is in case his rebuild fails and this all starts again.
What we see here is that the OP has a crate motor in the car. At that point all bets are off as to what is the correct water pump. Maybe a Corvette water pump was installed, maybe not. If the block came with a water pump and pulleys, then who knows.
Telling him to get a Corvette water pump is not going to help if that is not what was used on the new engine.
If however, the previous owner pulled the water pump off and installed a Corvette pump so that his Corvette accessories and pulleys would lineup, then yes he should follow recommendations.
But again we don't have any info on what the water pump is that he has now rebuilt. I think he should find out what it is in case his rebuild fails and this all starts again.
just my 2 cents.
From the photos of the engine and the layout of the accessories as well as the water pump photos, It appears to be all from the original engine bolt ons except the rad, rad fan and clutch delete spacer. Also the original water pump likely did not have anything wrong with it. In the OP's other thread on this he mentioned the engine was running hot but his rad and rad shroud do not appear to be stock. His rad fan also appears to be a 4 blade fan from another application and all this likely has more to do with his high temps than the WP which I believe he has also determined at this point.
Designer Imagines A Corvette That Looks More Like a Corvette Than the Corvette
Slideshow: A Jaguar designer's personal project imagines what a modern front-engined Corvette might look like if Chevrolet revisited the golden age of the Stingray.
Pulley doesnt fit new water pump
hahaha..... where's the Jumper Cables!!
