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radtech
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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
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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.
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Ryan Miller
MVPA # 22010 |
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wesk
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Location: Wisconsin
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4x4M38
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wesk
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radtech
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Joined: Aug 09, 2010
Posts: 185
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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
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radtech
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Posts: 185
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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
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radtech
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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
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RonD2
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Joined: Oct 02, 2014
Posts: 1950
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. 
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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
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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
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radtech
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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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