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Old 09-09-2020, 04:14 AM   #1
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3126 Oil Change...

Just a quick question.... I have heard "not" to fill the Oil Filter when replacing during the oil change as it may cause damage to the HEUI pump? Is this true?... Is this a pressure related issue?..


Thanks!!
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Old 09-09-2020, 04:56 AM   #2
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Originally Posted by Poseidon View Post
Just a quick question.... I have heard "not" to fill the Oil Filter when replacing during the oil change as it may cause damage to the HEUI pump? Is this true?... Is this a pressure related issue?..


Thanks!!
Never heard of it, never filled the oil filter on my 3126 cat 330hp in the 17 years I've had it.
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Old 09-09-2020, 05:02 AM   #3
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Never heard of it, never filled the oil filter on my 3126 cat 330hp in the 17 years I've had it.

So you just put the filter in without adding oil to it first and just added the correct amount of oil?... Coming from the "marine" side of doing oil changes, I was taught to "charge" the new oil filter before putting it back on... maybe that was just a personal preference I was taught...
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Old 09-09-2020, 05:32 AM   #4
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I serviced equipment for 34 years and never filled the oil filters. Even my own 1984 boat diesel engine.

Just made them heavy and messy.
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Old 09-09-2020, 07:07 AM   #5
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So you just put the filter in without adding oil to it first.
Yes. That is what Cat wants. The filter itself shows a "do not fill symbol" on it. Cat is concerned that you will get dirt in the filter (especially if you fill from the center opening) so they say don't prefill. But CAT manual also says that air in the oil system to HEUI/injectors can cause failure. So if you want to pre-fill, block the center opening in the filter and fill using the outside holes.

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Old 09-20-2020, 05:03 PM   #6
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The instructions fir my C-7 state to install filter dry. Add 17 quarts if oil. Run engine for 5 minutes. Finish fill with 2 more quarts. Total fill is 19 quarts. I save the one remaining quart and may need to add it at about 8,000 miles.
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Old 09-26-2020, 05:52 PM   #7
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Then there's this , from the 3126B manual .

JUST to add to the fire.

EDIT: BTW: I prefilled oil filters on Dodge /Cummins for 14 years before retirement and have prefilled ( with center ; outlet ; hole in filter plugged ) on my 3126 B for the past 10 . Never an issue .
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Old 09-26-2020, 06:02 PM   #8
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Try your own experiment and see for yourself. For a car I used to have, I tried the dry filter replacement and it took the oil gauge about 5 seconds to build up oil pressure. When I prefilled the oil filter, it would take 2-3 seconds for the oil gauge to build pressure.
If your motor idles at 600 RPM, then 2-3 seconds of RPM equals 20-30 motor revolutions w/o oil pressure. Why do that to your motor when it is easy to pre-fill the filter? Just common sense!
For a new motor, it is common to remove the spark plugs (no load on the bearings) and crank the motor until oil pressure was reached. Then replace the spark plugs and start the new motor. That's how they do it at a engine assembly plant, they prelube the engines by spinning them before the actual start up process.
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Old 09-26-2020, 06:07 PM   #9
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I've had many vehicles where it was not possible to pre fill the oil filter as it was mounted on it's side. Never had any ill effects. There is oil that stays in the bearings when the oil sump is drained so the bearings won't be dry. I don't think that a dry oil filter is an issue but use your own best judgement.
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Old 09-26-2020, 06:18 PM   #10
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The instructions fir my C-7 state to install filter dry. Add 17 quarts if oil. Run engine for 5 minutes. Finish fill with 2 more quarts. Total fill is 19 quarts. I save the one remaining quart and may need to add it at about 8,000 miles.

Dry starts are a classic cause for a oil burning engine! A dry start can result in a scoured main bearing or cylinder wall, which can cause low oil pressure and excess oil consumption.
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Old 09-26-2020, 06:21 PM   #11
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I've had many vehicles where it was not possible to pre fill the oil filter as it was mounted on it's side. Never had any ill effects. There is oil that stays in the bearings when the oil sump is drained so the bearings won't be dry. I don't think that a dry oil filter is an issue but use your own best judgement.

Even a side mount filter can be prefilled which allows the oil to soak into the paper element and speeds up the oil pressure time.
While it's true that there is oil residue left on the bearings, that oil is not under pressure to float the bearings which is critical especially when the main bearings are under load like the engine is firing and running full compression. Running a motor for even 20-30 revolutions w/o oil pressure is never a good thing.
As a retired auto engineer, I used to live this stuff!
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