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Discussion Forum

Oil pump rebuild

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jason larson

04-07-2003 20:24:13

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I was wondering if anyone had any information on how to rebuild or purchase a oil pump for a 1940 AC B. It was not pumping oil when I tore down the motor, and after tearing down the pump I could see nothing visualy wrong. Hope that some one has some help. Thanks

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Duey (IA)

04-08-2003 20:27:28

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 Re: oil pump rebuild in reply to jason larson, 04-07-2003 20:24:13  
Be sure to check the end plate on the oil pump. Any grooves will alow pressure to leak by. File or grind it flat if there are grooves.

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tom davison

04-10-2003 14:50:19

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 Re: Re: oil pump rebuild in reply to Duey (IA), 04-08-2003 20:27:28  
My brother in law had a rebuilt motor put in his C. The rebuild did not have a rebuilt oil pump and the dealer installed the old pump. Tractor had low oil pressure. We convinced the dealer to break it apart and check the oil pump. The pump needed new vanes and springs. The failed to check the end play, but the pump worked fine after the new parts were installed. There was no charge for the work. It would pay to install new vanes and springs to avoid possibly having to break the tractor apart again. The manual states the end play is important, and if the play cannot be sufficiently reduced, the pump body should be ground, etc. tom davison

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Tom Westerfield

04-08-2003 17:35:10

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 Re: oil pump rebuild in reply to jason larson, 04-07-2003 20:24:13  
As you observe, the pump is fairly simple. The central hub rotates off center in the housing. The only working parts are the two vanes and the two small springs that hold them outward. If the pump is terribly worn, i.e., the vanes are flat rather than angled, you may want to replace them. The parts are available from AGCO. The little spring are available too. It is fairly easy for one of those pumps to loose its prime. Fill it with oil before you re-attach it to the cam shaft.

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04-07-2003 21:41:26

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 Re: oil pump rebuild in reply to jason larson, 04-07-2003 20:24:13  
Spin the shaft while under some oil, you should be able to see if it is pumping, then use another thumb (from your wifes hand) try to stop the flow. Good luck Dave

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04-08-2003 17:10:02

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 Re: Re: oil pump rebuild in reply to dave, 04-07-2003 21:41:26  

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