Red Swinea

trying to replace water pump and every one i see has deeper impellars so that when installed, they are locking up against engine cylinder. can't seem to find original fit anywhere. HELP PLEASE!!!!

Red Swinea

i'm sorry 200ci. hit wrong button LOL

houtex

Who made them and what part numbers?

https://www.rockauto.com/en/catalog/...ater+pump,2208

Shows a Gates 42055 is supposed to be a correct exact OEM swap out, so...

Welcome to the forums!

Red Swinea

master pro PN# b251290

houtex

The MasterPro B251290. Looks right to me.

So... compare it to your old water pump. There has to be a reason. *All* the water pumps can't be wrong. Only thing that'd make sense after that is your engine is wrong. Like someone shaved the engine down on the water pump mount (unlikely), or it's not a 200... or it's been fixed in the area on that cylinder and it's too high...

This video shows a '67 200 in a truck, which is the same as your Mustang's, and it looks the same as that MasterPro one there. I haven't ever worked on a 200 to that extent, it's amazing to me how close the number 1 cylinder is to the pump. I mean, it's gotta be compact, but you'd think there'd be a little more room...

THAT being said... You sure it's not this pump? MasterPro B251380. Yep, it's for a Ford inline 6... but the 250ci engine. I'm thinkin'. somebody swapped out your engine for the 250. Looks the same, being a stroked block, but obviously isn't, as they wouldn't have different part numbers. And if you look at the side profile, you'll see that the 200 one has a flange on it and no metal gasket, whereas the 250 one doesn't have that flange and the metal gasket. This would explain the clearance issue you're having...? Although I can't be certain, surely you'd notice that fourth bolt wasn't there anymore...

I don't know if that helps or not. Just a guess from afar. Very confusing without pics now...

Red Swinea

houtex

Yeah, ok, that's the 200 ci pump and mounting alright. So you compared the old and new, right? Did you see any big differences between the two pumps?

Also, there seems to be quite the build up for some reason in that jacket on the cylinder. It's really dark too... And I notice a little rubbing/shaving going on near where the bottom of the impeller would go... In that video I posted, it's much cleaner than yours is.... waiiittt...

Ok, so at the 1:50 mark in that video. Pause it. Look carefully at the cylinder. Compare to your picture of your cylinder.

*Something* happened to that engine. There's a *divot* in cylinder. That's not supposed to be there. I think that block is suspect. You might need an expert. I think you might need a block. Or a heck of an engine repair. I wouldn't be running it at all now. I mean, this is all from my armchair quarterback position, but... that ain't lookin' right to me. At all.

In my humble opinion... If you simply MUST use that block... and again, I'm voting retire the block... There is no new water pump you're going to get that's going to fit. You'll have to shave the cylinder down to fix it, if that's the interference problem. Looks like it probably was built up to fix the cylinder from a crack... So maybe you can shave it down and make it work.

Here's how I'd do it. I'd latex paint the impeller with white paint. Or light grey, or cyan or whatever, something that'll stay tacky long enough for the trick. Install pump, remove it. Wherever the paint was, shave that down in the block. Careful to remove any shavings, mind. Repeat (having cleaned the impeller of course, then reapplied paint) until there's no more white paint on the block. Install pump. Should be fine.

If I *had* to do it. Which I wouldn't. That looks real messed up to me...

But you do you. Worst case, you blow it up, eh?

houtex

Ok, so I'm ing this up because I'm curious, and certainly I can't be the only one...

So... what happened?