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radtech Member
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Joined: Aug 09, 2010 Posts: 185
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Posted: Tue Sep 05, 2017 6:46 pm Post subject: M38 primer pump |
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I have come across several NOS primer pumps and they all had stuck discharge ball checks.The solution is to make a pin punch from a coat hanger,remove the piston then the discharge check plug and push the ball and spring out from the piston cylinder end.Then spray some carburetor cleaner into the discharge port and use a Q tip to swab it out.Reassemble it and it will work fine. |
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Ryan_Miller Site Administrator
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Joined: Apr 03, 2005 Posts: 1635 Location: Kansas
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Posted: Wed Sep 06, 2017 7:24 am Post subject: |
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Sounds good!
Thanks for posting the tip, I am certain it will help others working on the primer pumps. _________________ Ryan Miller
MVPA # 22010 |
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wesk Site Administrator
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Joined: Apr 04, 2005 Posts: 16282 Location: Wisconsin
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4x4M38 Member
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Joined: May 30, 2014 Posts: 3452 Location: Texas Hill Country
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wesk Site Administrator
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Joined: Apr 04, 2005 Posts: 16282 Location: Wisconsin
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radtech Member
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Posted: Thu Sep 07, 2017 8:18 am Post subject: |
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The steel ball pressed into the brass fitting over years can bond together. |
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4x4M38 Member
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radtech Member
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Posted: Thu Sep 07, 2017 2:48 pm Post subject: |
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There is no gasoline in NOS pumps right out of the original package.They didn't put cosmolene inside the pump. |
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4x4M38 Member
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radtech Member
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Posted: Thu Sep 07, 2017 5:02 pm Post subject: |
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Steel pressed to brass for years.I just put a NOS suction check valve on a pump I rebuilt with new leather it was packaged in 1952 and the steel ball was stuck to the brass in it as well.I had to use a paper clip to get it loose. |
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4x4M38 Member
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Joined: May 30, 2014 Posts: 3452 Location: Texas Hill Country
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RonD2 Member
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Joined: Oct 02, 2014 Posts: 1949 Location: South Carolina, Dorchester County
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Posted: Thu Sep 07, 2017 9:50 pm Post subject: |
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4x4M38 wrote: | Any idea what's sticking the balls if it's not some sort of lube/storage
fluid? |
Could it be dissimilar metal (a.k.a galvanic) corrosion?
http://engineersedge.com/galvanic_capatability.htm
Just my rookie 2 cents......... .....and from seeing the weird things that happen very quickly to all kinds of metal in a sea-salt environment, courtesy of Uncle Sam! Call me Jar-Head. ![Very Happy](modules/Forums/images/smiles/icon_biggrin.gif) _________________ Ron D.
1951 M38 Unknown Serial Number
1951 M100 Dunbar Kapple 01169903 dod 5-51
“The only good sports car that America ever made was the Jeep."
--- Enzo Ferrari
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radtech Member
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Posted: Fri Sep 08, 2017 6:36 am Post subject: |
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New made leather for the pumps is available on ebay and they work great. |
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4x4M38 Member
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radtech Member
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Posted: Sat Sep 09, 2017 8:11 pm Post subject: |
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New leather will not help if either of the 2 ball checks are stuck to the brass. |
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