Author Topic: 1956 Cadillac Water Pump Mounting Bolts  (Read 165 times)

Offline limikep

  • Posts: 17
    • CLC Member
      CLC Member #11110
  • Name: mpisciotta
1956 Cadillac Water Pump Mounting Bolts
« on: January 09, 2018, 08:32:25 AM »
Hello All

I had to remove the two 3" bolts holding the power steering bracket to the water pump in order to rebuild the power steering pump.  These two bolts attach to the head.  One of the bolts was stripped.  I am trying to get the same bolts from a parts car.  Is this a bad idea to use an original (old) bolt.  If I cannot find or use an original, should I use a Grade "5" or Grade "8" bolt which will be matched up at a hardware store.  Thank you all in advance.  Mike

Offline fishnjim

  • Posts: 395
    • CLC Member
      CLC Member #29423
  • Name: J. Bozin
Re: 1956 Cadillac Water Pump Mounting Bolts
« Reply #1 on: January 09, 2018, 08:43:14 AM »
New bolts will be bright plated which is not original, but you can lightly bead blast them to take off the sheen and they'll look period zinc.   Or use black and paint over. 
If the old bolts are rusty/threads worn/head stripped/shaft thinned, don't use.   
Use a torque wrench not an impact.   Chase the threads in the head also.  I broke that one off and then broke the tap trying to get it out and it's not a nice job to repair on car.   Easy to see why they changed that design.

Offline limikep

  • Posts: 17
    • CLC Member
      CLC Member #11110
  • Name: mpisciotta
Re: 1956 Cadillac Water Pump Mounting Bolts
« Reply #2 on: January 10, 2018, 07:28:36 AM »
Great advice.. thank you.  Was going to use a regular tap.
If I cannot get an original bolt, does anyone know if I should use a Grade "5" or Grade "8" bolt as a replacement.

Re: 1956 Cadillac Water Pump Mounting Bolts
« Reply #3 on: January 10, 2018, 07:52:47 AM »
Grade 5 is fine for your water pump.  The Grade 8 bolts have a higher tensile strength and are generally used on attachment points that are safety-critical, like suspension and steering. 
Art Gardner


1955 S60 Fleetwood sedan

Offline John Washburn CLC 1067

  • Posts: 1207
  • Call me on my shoe phone 303+885-3545
    • CLC Member
      CLC Member #1067
Re: 1956 Cadillac Water Pump Mounting Bolts
« Reply #4 on: January 10, 2018, 09:58:23 PM »
I have used stainless bolts since the 80's since they are good enough for the water pump. I do use the anti seeze on the threads so the next owner can remove them without a problem.

But that is my opinion.

The Johnny
John Washburn
CLC #1067
1937 LaSalle Coupe
1938 6519F Series Imperial Sedan
1949 62 Series 4 Door
1953 Coupe DeVille
1956 Coupe DeVille
1992 Eldorado Touring Coupe America Cup Series

Offline David Greenburg

  • CLC #3830
  • Posts: 1269
    • CLC Member
      CLC Member #3830
  • Name: David Greenburg
Re: 1956 Cadillac Water Pump Mounting Bolts
« Reply #5 on: January 10, 2018, 10:47:17 PM »
Anti-sieze is a good idea; given the quality of rebuilds and replacement parts these days, the “next owner” doing that job might just be you in a couple of years. I’m in the process of replacing a 2 year old failed water pump right now.
David Greenburg
'60 Eldorado Seville
'61 Fleetwood Sixty Special

Re: 1956 Cadillac Water Pump Mounting Bolts
« Reply #6 on: January 11, 2018, 08:24:08 AM »
"I have used stainless bolts since the 80's since they are good enough for the water pump. I do use the anti seeze on the threads so the next owner can remove them without a problem."

If you do use stainless bolts, The Johnny's suggestion of using anti-seize compound is a good one.  Stainless steel is "gummy" as steel goes, and can gall and seize up going in or out.  So yeah, use the goop.  Heck, using anti-seize is usually a good idea anyway...
Art Gardner


1955 S60 Fleetwood sedan

Offline cadman56

  • Posts: 356
    • CLC Member
      CLC Member #5820
  • Name: Larry Blanchard
Re: 1956 Cadillac Water Pump Mounting Bolts
« Reply #7 on: January 11, 2018, 10:15:07 AM »
Use a thread cleaning tool, not a tap.  Like John, I too use never seize on bolts.
Grade 5 is sufficient for the water pump.
Good luck.
1956 Cadillac Coupe deVille (sold)
1956 Cadillac Convertible (sold)
1956 Cadillac Eldorado Seville
1967 Cadillac Eldorado (sold)
1968 Cadillac Convertible
1991 Cadillac Fleetwood Brougham dElegance
Larry Blanchard CLC #5820

 

Get the CLCMRC 2018 Calendar - AVAILABLE NOW!