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Tractor Talk Discussion Forum

350 chevy motor help

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37 chief

02-10-2005 12:09:42




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I am in the process of installing a new oil pump in my rebuilt chevy motor. The oil pickup screen is just pressed in to the pump body. Is there something to do to keep it from falling out? Thanks, Stan




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1945 A

02-11-2005 07:21:34




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 Re: 350 chevy motor help in reply to 37 chief, 02-10-2005 12:09:42  
Chief---
I"ve built several 350 engines over the years, and have never welded the pick up tube to the pump----that"s enough interference fit, that it"s just not going to come out in normal use, if ever.
I always start by putting the tube partially into the pump---far enough that it will stay put, but not all the way, then, set the oil pan in place, and push the pan against the block---that will give you the proper angle for the pick up tube, remove the pan, and then drive the tube the rest of the way into the pump housing.

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Bob

02-10-2005 18:25:29




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 Re: 350 chevy motor help in reply to 37 chief, 02-10-2005 12:09:42  
I have made a tool that straddles the tube, and catches the raised rib on the pickup tube, so you can tap the tube into place into the oil pump. I use Loctite on the tube, and put a dab of modeling clay on the pickup screen area, and then put the oil pan in place, and then check to what degree the clay has been squished, before the Locktite sets up to indicate how close the pickup screen is to the oil pan, and you can make any needed adjustments from there.

There's a lot of people that will tell you to weld the pickup tube to the oilpump cover, but the fact is the tube is steel, and the bottom part of the oilpump is cast iron, and, unless you use nickel rod, and burn it in good, you really, aren't going to "stick" the tube to the oil pump body body very well.

IMHO, using Locktite and verifying exactly WHERE the pickup tube screen is in relationship to the oilpan is the best way to go.

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Loren

02-10-2005 21:00:03




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 Re: 350 chevy motor help in reply to Bob, 02-10-2005 18:25:29  
I don't remember which size it is but an open end wrench fits it real well and if you put it on square and all the way on gives, what, 75%? Might be a metric size but one fits real good and tight.



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Old Pokey

02-10-2005 17:57:27




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 Re: 350 chevy motor help in reply to 37 chief, 02-10-2005 12:09:42  
Yep, the guys talking about welding it in are right. That will keep it in place. If you do your own wrenching, which you seem to do, and you want to be able to replace the pump again sometime without having to buy a new pickup tube, then just spot weld it in. One thing though, is put the ground of the welder on the pickup tube. Dont put the ground on the pump or it could ark through the gears and ruin the pump before you even put it in the engine.

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Allan in NE

02-10-2005 17:30:29




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 Re: 350 chevy motor help in reply to 37 chief, 02-10-2005 12:09:42  
Tap 'er in there using a small chiesel against that lip and make sure it is it clear up to the rib.

They are a wedge fit and it 'taint a gonna come outta there,

Allan



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RJ-AZ

02-10-2005 17:17:44




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 Re: 350 chevy motor help in reply to 37 chief, 02-10-2005 12:09:42  
I clean the pickup tube up and hit it with some emery cloth and then use some RED Loc-Tite and tap it in. I have built many Chevy small block engines this way.



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dr.sportster

02-10-2005 12:58:28




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 Re: 350 chevy motor help in reply to 37 chief, 02-10-2005 12:09:42  
37Chief,The practice on a race motor was to tack weld in place and then braze all around.The pickup tube to the pump body I mean.I dont think its nessecary on a street motor Im sure you will hear from many others on this.This is just general info but they also put big block pumps on the small block for increased volume.[I dont think you care about the big block pump you just dont want your pickup tube to fall out.]

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GregCo

02-10-2005 12:51:21




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 Re: 350 chevy motor help in reply to 37 chief, 02-10-2005 12:09:42  
I usually spot braze them or spot weld them with the wire welder. Some folks just press them in and don’t worry about it, but I have see a few fall out. A few minutes spent now will prevent any chance of the pick up tube from falling off.



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Tim...OK

02-10-2005 14:06:22




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 Re: 350 chevy motor help in reply to GregCo, 02-10-2005 12:51:21  
Yep weld it..put your pickup in the pump,and swivel it down til it"s obviously too far,set your oil pan to position the pickup,then remove the pan,bump the pickup about 1/4" more for clearance,then just put a good tack on it,with mig or arc turned way down..don"t put too much heat into it or your relief spring will lose it"s springy and your oil pressure will go down the crapper (don"t ask how I know this)..just one healthy little tack is all it needs.
HTH,

Tim

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