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Old 02-07-2009, 08:37 PM   #1
Mechie3
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Default Engine rebuild, parts to reuse, general questions

I'm rebuilding my old engine (spun bearing) and want to know if I can reuse the oil pump and the oil cooler. I vaguely remember someone saying that if you spun a bearing the flakes tend to collect in the pump/cooler (don't remember if it's both or one or the other) and are impossible to fully clean out.

Is it safe to reuse my pump/cooler (30K miles on both) or should I just buy new ones?

Also, how do I prime the oil pump/the entire engine before starting it the first time? Do I pour some oil in through the head breather lines to make sure they're coated? What about turning the engine upside down during assembly? Will this affect pump priming (ie, drain it if it has been primed)?

Thanks.
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Old 02-07-2009, 09:22 PM   #2
joeschmoe714
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as far as i know you always replace the pump.
im not so sure about the cooler though.
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Old 02-07-2009, 10:52 PM   #3
LiquidForce
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I would buy a new pump and cooler as well as a new pan.

As far as priming the pump, before starting I just pull the fuel pump relay and crank the motor over a couple of times for about 10 seconds each.
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Old 02-07-2009, 10:53 PM   #4
benw
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changing the cooler is recommended as there are many small galleries inside the unit that readily accumulate metal chips and shavings from nuked bearings. you fire up the new engine and all that junk washes over your bearings and scores them.
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Old 02-07-2009, 11:33 PM   #5
Mechie3
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I don't need to fill the pump itself with oil first? What about the heads and such? Should I "prime" those as well so the engine isn't turning over without any oil at all having gotten there?
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Old 02-08-2009, 12:02 AM   #6
reddevil
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For my PERSONAL use only, I just tear down the oil pump and inspect. I have one that has 100xxx miles on it, and been on 7 motors... (not that those 7 motors lasted very long unto themselves), BUT I have never had a oil issue.

The big thing is too just inspect the pump and make sure its withen spec.

However, as a 10mm oil pump is something like $175, it may not matter to you.
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Old 02-08-2009, 05:47 AM   #7
Ej2.6
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what kinda cooler should one replace it with when rebuilding a new engine? and i too am curious aout priming the engine.
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Old 02-08-2009, 06:52 AM   #8
Fongers
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you might be able to tear down and flush to rebuild. Worth a shot for sure.
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Old 02-08-2009, 01:25 PM   #9
yarrgh
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the oil pump is fully capable of being disassembled to clean and check for debris. Like what was said, check it for being in spec. If nothing is wrong, then it's ok to use.

As for priming the oil pump, you can use smear some assembly lube in the gears, I've read that someone used a little vasoline. To prime the engine, take out spark plugs(don't want compression if no oil on bearings) and disconnect injectors/fuel pump relay and crank about 10 seconds for about 6 times.

As long as you're in there, port match the oil pump to the block.
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Old 02-08-2009, 03:49 PM   #10
WrXtaCy2003
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^^^^agreed.

The oil light should turn off after priming it too. This means there is 15psi of oil pressure in the system. It may not be 15, maybe 10 or so, but either way it means that you have built pressure in the system.

DK
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Old 02-08-2009, 03:57 PM   #11
Fongers
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Just pull the ignition fuse, that will kill fuel and spark and crank till the light goes out. I even do his for each oil change...
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Old 02-08-2009, 08:06 PM   #12
Mechie3
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Thanks. I just wasn't sure if the system would self prime using the starter cranking method if the gears in the pump weren't already filled with something.
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