• Mustang Forums
  • 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk-

Water pump flange fell off

  • Thread starter Thread starter Carpenter78
  • Start date Start date Apr 19, 2024

Carpenter78

Member
Apr 29, 2020
9
2
13
42376
Apr 19, 2024
#1
  • Apr 19, 2024
  • #1
I was in the garage warming my engine to do some tuning, when all of a sudden the fan flew off. I shut everything down and found that the fan, clutch, pulley, and flange was laying on the other side of the garage. Can anyone tell me how the flange is held on the shaft? I can't see any provisions for an internal faster or spot weld. Is it just a press fit? This is on a standard rotation Flow Kooler water pump.
 

Attachments

  • 20240419_144604.webp
    268.4 KB · Views: 160
  • 20240419_144554.webp
    107.6 KB · Views: 143

evintho

20+ Year Stangneter
Nov 12, 2003
683
245
73
Santa Rosa, CA.
Apr 20, 2024
#2
  • Apr 20, 2024
  • #2
I think I'd give Flow Kooler a call and mention there's an issue!
 

nickyb

I gotta say i never painted my nuts, Never Ever
15 Year Member
Apr 3, 2009
2,979
1,626
153
nevada
Apr 20, 2024
#3
  • Apr 20, 2024
  • #3
That could have taken out an expensive radiator. That company should ship you a new one asap.
If they won't then I would drill a small hole and tap it for a set screw.
 

Noobz347

Stangnet Facilities Maint Tech... Er... Janitor
Admin Dude
Jan 4, 1985
43,009
21,191
234
Box behind Walmart
Apr 20, 2024
#4
  • Apr 20, 2024
  • #4
nickyb said:
That could have taken out an expensive radiator. That company should ship you a new one asap.
Click to expand...
Agreed!

nickyb said:
If they won't then I would drill a small hole and tap it for a set screw.
Click to expand...
There is no way I would reuse that pump.
 

Bullitt347

I have been doing it wrong this whole time
15 Year Member
Mar 23, 2007
3,955
2,914
194
Middle of Maine
Apr 20, 2024
#5
  • Apr 20, 2024
  • #5
That flange is a press fit.
Obviously the parts were not spec'd correctly when it was put together.
 

Carpenter78

Member
Apr 29, 2020
9
2
13
42376
Apr 20, 2024
#6
  • Apr 20, 2024
  • #6
It did take out my radiator. If it happened 30 seconds later, I would have been standing over the fan with a timing light. I plan on pressing hub back on with Loctite 638 and tapping for a set screw. I can't believe these are relying on a press fit with no way to retain the assembly.
 

General karthief

wonder how much it would cost to ship you a pair
20+ Year Stangneter
Aug 25, 2016
27,892
10,553
203
polk county florida
Apr 20, 2024
#7
  • Apr 20, 2024
  • #7
Most all factory power steering pump pulleys are press fit for all my life and only seen a few come off.
I would document the damage and give them a ring, you bought it from them right?
 

Carpenter78

Member
Apr 29, 2020
9
2
13
42376
Apr 20, 2024
#8
  • Apr 20, 2024
  • #8
Yes sir. I purchased the pump about 2.5 years ago while stock piling part for the build, only ran for less than a hour. I can maybe understand a power steering pump pulley, that doesn't have a 5lbs + rotating blades attached though. I will reach out to Flow Kooler with little expectations due to the purchase date.
 

General karthief

wonder how much it would cost to ship you a pair
20+ Year Stangneter
Aug 25, 2016
27,892
10,553
203
polk county florida
Apr 20, 2024
#9
  • Apr 20, 2024
  • #9
Yeah it should not have come off, assembly defect, I mean ya gotta buy or fix the radiator that was garred up now too, see what they say, press a little, assert your masculinity, well maybe a little, they shouldn't like the dis-likes in their social media, just be nice about it.
 

nickyb

I gotta say i never painted my nuts, Never Ever
15 Year Member
Apr 3, 2009
2,979
1,626
153
nevada
Apr 20, 2024
#10
  • Apr 20, 2024
  • #10
Agree with General, email them pics of pump and damage, be nice but if they don't do what's right you can post emails and pics of them being dicks.
 

85GTStangGuy

5 Year Member
May 19, 2021
1,001
625
133
Jax, Florida
Apr 20, 2024
#11
  • Apr 20, 2024
  • #11
Noobz347 said:
There is no way I would reuse that pump.
Click to expand...
Yea.... I think that's a good idea.
 

WhiteCobra95

10 Year Member
May 2, 2006
634
177
74
Apr 21, 2024
#12
  • Apr 21, 2024
  • #12
This is really disappointing. I had their pump on my future parts-to-order list, mainly because there aren't too many water pump options for SN95s. Now I'm second guessing that potential purchase.

This is the kind of stuff that really ticks me off about aftermarket parts. I've never heard of this happening on a factory pump.

Does Edelbrock still make a Fox Body water pump? I used to run their pumps on my 460s back in '90s and they were really good quality at that time.
 

2000xp8

SN Certified Technician
Aug 8, 2003
8,020
1,615
194
NJ
Apr 24, 2024
#13
  • Apr 24, 2024
  • #13
WhiteCobra95 said:
Does Edelbrock still make a Fox Body water pump? I used to run their pumps on my 460s back in '90s and they were really good quality at that time.
Click to expand...
Lmr looks to have foxbody Motorcraft water pumps for $60.
I see no reason to use any other (when it comes to 86-93)
 

AeroCoupe

lube between the nut and the face. I know my lubes
Founding Member
Oct 28, 2001
5,845
3,975
183
Claremore, OK
Apr 24, 2024
#14
  • Apr 24, 2024
  • #14
Edelbrock still makes water pumps and they are still pricey but like WhiteCobra95 my experience with them has been really good. Still running the one I bought for the T-Bird over 25 years ago.

Water Pump Ford 5.0 V8 Reverse Rotation in Satin Finish

Edelbrock #8840 Water Pump Ford 5.0L 1986-93 Reverse Rotation Ideal to prevent overheating in street rods and street machines
www.edelbrock.com

I have a Motorcraft on the Coupe and I have had zero issues so I would probably just buy another one.
 

Mustang5L5

That is…until I whipped out my Bissell
Mod Dude
Feb 18, 2001
43,236
17,921
224
Massachusetts
Apr 25, 2024
#15
  • Apr 25, 2024
  • #15
I have the Edelbrock as well. A little spendy.

The impeller design does vary between different brands and such. There are higher flow versions which move more coolant. The Edelbrock is the high flow design but I also think FLowcoolers are as well.

How much that translates to actual real world cooling improvement i have no idea
 

Carpenter78

Member
Apr 29, 2020
9
2
13
42376
Apr 26, 2024
#16
  • Apr 26, 2024
  • #16
I hope my decision to repair this pump doesn't come back to bite me but... I decided to drill and tap the hub for 10-32 set screws on opposite sides of the hub. I also pressed hub on with Loctite 638 retaining compound. I've been known to make some less than sensible decisions in the past, I guess I'll see if this repair holds up. Thanks for all the input.
 

2000xp8

SN Certified Technician
Aug 8, 2003
8,020
1,615
194
NJ
Apr 26, 2024
#17
  • Apr 26, 2024
  • #17
I would absolutely NOT do this.
Call the company and if they don't handle it, find a big name place that still sells it, buy it, put this one in the box and return it.
I've seen serpentine belts come off and take out AC and power steering hoses.
I can only imagine the carnage from the fan coming off too at 5000rpm while you are driving.
I'm also not sure of the shear strength of 10-32's or if they really make grade 8 versions. As an electrician we use them all the time and if you pull on them, they are strong, if you side load them they can be bent or broken.

This is a pointless gamble and you may spend the rest of the time you own the car wondering when the fan is going to fly off and if and when you forget, that's when it will happen.
I've broken a belt when driving, it's kinda scary for a moment as you really don't know what's going on, especially since the steering barely works.
 
Last edited: Apr 26, 2024
Reactions: Carpenter78

Mustang5L5

That is…until I whipped out my Bissell
Mod Dude
Feb 18, 2001
43,236
17,921
224
Massachusetts
Apr 26, 2024
#18
  • Apr 26, 2024
  • #18
I concur. I would not repair this. The cons outweigh the pros here. The fact that the press fit failed means it will fail again and you are putting too much trust on loctite and 10-32s.
 
Reactions: Carpenter78 and 91AOD5.0LX

WhiteCobra95

10 Year Member
May 2, 2006
634
177
74
Apr 28, 2024
#19
  • Apr 28, 2024
  • #19
I agree 100% - call FlowKooler and ask them what's up with this! This type of failure is completely unacceptable for their price point, let alone any water pump, and completely undermines the air of quality they promote for their products. I'm really curious to see what they do to rectify this - it will definitely have an impact on what direction I go for water pumps in the future.

The only way I would run that pump is if I was switching to an electric fan and the hub could somehow be TIG'ed in place. But I'm not much of a welder, so I would have to check with the techs in my lab at work to see if that's even possible with a water pump.
 
Reactions: General karthief

LX Dave

5 Year Member
Jul 2, 2017
239
181
53
May 1, 2024
#20
  • May 1, 2024
  • #20
This is like deja vu. I had the same thing happen last fall, but going down the road. The parts store I got it from replaced every part that was affected. New fan, fan clutch, water pump (of course) and payed for a re-core on the NOS radiator that was in the car. Just the re-core was 950.00. That company should do the same. I wouldn't trust fixing it because the fitment isn't correct to begin with. Make them replace it.

When I got the new water pump for mine, I ground two small spots on the front side in the corner where the flange meets the shaft and welded the flange on. Being press fit, I didn't want to drill a hole and put a set screw or pin in and weaken the flange in that spot. I felt that would guarantee a crack would start from that spot and just have another failure.
 
You must log in or register to reply here.

Similar threads

6
Hey all,I’m putting together a 302 for my 1968 Mustang and wanted to post the combo + some questions to make sure I’m not missing crucial
  • 68_Disgustang
  • Feb 22, 2026
  • 1965 - 1973 Classic Mustangs -General/Talk-
Replies
4
Views
800
1965 - 1973 Classic Mustangs -General/Talk- Jun 20, 2026
gray owl
G
SOLD SOLD!!!! 1993 Notchback Roadracer For Sale. She's a beast!
  • Boydster
  • Apr 25, 2025
  • Fox Body Mustangs For Sale (1979-93)
Replies
0
Views
1K
Fox Body Mustangs For Sale (1979-93) Apr 25, 2025
Boydster
98 GT PI Swapped Engine Fires, Dies Immediately NOT PATS
  • MMccPerformance
  • Dec 2, 2023
  • SN95 4.6L Mustang Tech
Replies
3
Views
2K
SN95 4.6L Mustang Tech Dec 20, 2023
Yel2002GTAuto
Y
Progress Thread Dirty Water Racing 89 Notch Project
  • ShedBuiltMS
  • Sep 29, 2020
  • 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk-
  • 2 3 4
Replies
64
Views
13K
1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk- Apr 28, 2021
Flyboy60
F
E
For Sale 1989 LX Notch 410ci 85mm turbo 8 pt cage 9" rear end
  • EightyNineFive
  • Aug 22, 2021
  • Fox Body Mustangs For Sale (1979-93)
Replies
1
Views
4K
Fox Body Mustangs For Sale (1979-93) Jun 18, 2022
Freakinstang
F
Share:
Bluesky Email Share Link
  • Mustang Forums
  • 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk-
Menu
Log in

Register

  • Forums
  • What's new
  • Media
  • Resources
  • Contact
  • Sponsor
X

Privacy & Transparency

We use cookies and similar technologies for the following purposes:

  • Personalized ads and content
  • Content measurement and audience insights

Do you accept cookies and these technologies?

X

Privacy & Transparency

We use cookies and similar technologies for the following purposes:

  • Personalized ads and content
  • Content measurement and audience insights

Do you accept cookies and these technologies?