Engine Coolant leak after replacing water pump

OldManRiver

Active Member

Feb 14, 2015

238

131

53

Central Wisconsin

Sep 13, 2021

#21

• Sep 13, 2021

• #21

The hex head bolts that are used to secure the backing plate to the pump have low profile heads,stock height hex head bolts will not let the pump seat properly.This is why I mentioned the height of the heads on the socket head cap screws,the heads would end up being too tall unless button heads were used.

I believe it was FlowKooler that for a time supplied regular hex heads with their pumps and had a lot of pissed off customers with leaky pumps after install.

 

C

chrlsful

Active Member

Mar 6, 2021

278

37

38

Lawrence Swamp, S.Amherst, MA

Sep 13, 2021

#22

• Sep 13, 2021

• #22

I like GMB (summitt): "...the heads would end up being too tall..."
as I said:
"...follow all the recommended proceedures..."

https://www.summitracing.com/parts/gmb-125-1420p

(may not B correct pump, gets U onda site)

 

Last edited: Oct 19, 2021

91GTstroked

15 Year Member

Jun 14, 2007

503

282

93

Oct 15, 2021

#23

• Oct 15, 2021

• #23

Gonna take the car out today in cooler weather and see what happens...

 

Redfire Fox

Active Member

Dec 29, 2011

56

26

39

Oct 17, 2021

#24

• Oct 17, 2021

• #24

I kept getting a leak between the backing plate and pump every time I changed the pump due to the backing plate bolts not giving me enough seal pressure. What I did was use two washers for those bolts to give me greater seal pressure because it gave the bolt heads more contact. I just had to make sure the washers weren't hitting the timing cover mating surface. Worked every time.

 

Last edited: Oct 17, 2021

Reactions: 91GTstroked and nickyb

C

chrlsful

Active Member

Mar 6, 2021

278

37

38

Lawrence Swamp, S.Amherst, MA

Oct 19, 2021

#25

• Oct 19, 2021

• #25

C if U can ck for flat ona "known flat plane". Too much crank dwn pressure scares me w/a crack. Gasket/snot/glue on pump & block side (I like that red stuff that 'never solidifies/hardens') ...hand tight all round then to 30 lb tq or less...done

 

Last edited: Oct 19, 2021

90sickfox

Wasn't a pretty sight...and I've got big hands

SN Certified Technician

Mar 2, 2015

6,945

5,816

213

Oct 26, 2021

#26

• Oct 26, 2021

• #26

Do not torque the water pump bolts to 30lbs. That's twice factory torque. Dealer spec is 15lbs. or about half a ugga dugga.

 

Reactions: General karthief

91GTstroked

15 Year Member

Jun 14, 2007

503

282

93

Oct 28, 2021

#27

• Oct 28, 2021

• #27

90sickfox said:

Do not torque the water pump bolts to 30lbs. That's twice factory torque. Dealer spec is 15lbs. or about half a ugga dugga.

Click to expand...

I always torque to oem specs.

 

Reactions: 90sickfox