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Farmall & IHC Tractors Discussion Forum
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Farmall 400 oil pump prime

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taz460

03-29-2020 16:38:54




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I am in the middle of an overhaul on my 400. My question is priming the oil pump. I plan on submerging the pump in oil, rotating the shaft until oil is pumping then install pump and pan, then fill with oil. Is there a better way to prime the system? Should I do more priming before I fire the engine? Thanks in advance




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504

03-30-2020 18:23:47




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 Re: Farmall 400 oil pump prime in reply to taz460, 03-29-2020 16:38:54  
I pack the pump with Vaseline.



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taz460

03-30-2020 19:48:41




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 Re: Farmall 400 oil pump prime in reply to 504, 03-30-2020 18:23:47  
Thanks



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Bob

03-29-2020 22:20:52




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 Re: Farmall 400 oil pump prime in reply to taz460, 03-29-2020 16:38:54  
Quoting Removed, click Modern View to see

Oil pumps can be packed with a reasonable amount of Automatic Transmission Assembly Lube, or even Vaseline to aid in priming.

In this case, the pump is submerged in engine oil once the pan has the required amount of oil put in, plus you've lubed the gears to prevent "galling" from a dry start, in case crankcase oil doesn't find it's way in there in the time between filling with oil and attempting to start the engine.

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John M

03-29-2020 20:27:03




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 Re: Farmall 400 oil pump prime in reply to taz460, 03-29-2020 16:38:54  
I did pretty much what Jim said below, except I used STP oil treatment. The last few I did I used something else, the name escapes me at the moment. It came from my parts guy who retired and sold it to me cheap.

If you want to prime the system, just turn the engine over with the starter and the switch off until oil comes out at the rockers.



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used red mn

04-01-2020 17:03:00




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 Re: Farmall 400 oil pump prime in reply to John M, 03-29-2020 20:27:03  
While turning the engine over until you see oil at the rocker arms is good idea I think it is sort of over kill. I feel your just placing undue wear on your starter. I feel turning it over until the oil pressure gauge comes up and then another 5 seconds or so is sufficient. Hopefully you assembled it properly pre-lubing all wear points like anything that turns, pivots or slides. I would recommend leaving the spark plugs out and not having fuel in the carb while doing this.

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David G

03-29-2020 18:25:40




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 Re: Farmall 400 oil pump prime in reply to taz460, 03-29-2020 16:38:54  
No need for that, just make sure the gears have some lube on them, it will suck.



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Janicholson

03-29-2020 17:49:07




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 Re: Farmall 400 oil pump prime in reply to taz460, 03-29-2020 16:38:54  
I coat the pump gears with Engine Assembly lube before putting on the cover. (cover removed to check gear end clearance. .0008 to .001 is great, adjusted by gasket thickness (caseih has them) end plate should be flat, no grooves or warp! Polishing it flat on a glass plate with 320 grit paper in non-directional pattern will do. The engines I build are assembled with Lubriplate engine assembly lubricant on all bearings and cam lobes, using engine oil on pistons/cylinders. Jim

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rustred

03-29-2020 16:52:58




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 Re: Farmall 400 oil pump prime in reply to taz460, 03-29-2020 16:38:54  
I have never done that, meaning submerging the pump in oil. just poured some oil into it and install. crank engine over till you see oil coming out of gauge line. plus make sure all brgs. including pistons are well oiled on assembly.



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