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Old 12-18-2017, 06:42 PM   #1
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Changing Oil & Filter

Holy crap ! Just reading the operation and maintenance manual for my engines and run across an item regarding filling new oil filters with oil prior to install. I must admit that in all the years doing this on my boats it never occurred to me to do that, and come to think .... I never see a lube rack / garage doing this when changing oil & filter on a car. How serious of an issue is that ??? FB
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Old 12-18-2017, 06:48 PM   #2
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If you are like most and run your engine to warm the oil before draining it, I am pretty confident the residual oil will lubricate quite adequately as the filter fills and begins to circulate the new oil. I usually pour it about half full, spilling some onto the "O" ring so I can give it a finger swipe to lube the new ring before replacing the filter. JMO
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Old 12-18-2017, 06:52 PM   #3
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I never did it on my sailboats that had horizontally mounted filters. However, on my Cummins I fill the oil filter before spinning it on. I don't thing it is a big deal however.
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Old 12-18-2017, 06:56 PM   #4
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Why not just do what the manufacturer tells you to do for that particular engine? Who cares what other people do on other models of engines?
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Old 12-18-2017, 07:02 PM   #5
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Don't think it is a big deal, I am doing it on mine as it is a huge truck filter housing with a cartridge (contains around 1 liter just in the housing) and it makes the level adjustment easier.

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Old 12-18-2017, 07:18 PM   #6
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I don’t fill them. It would be almost impossible to fill the starboard engine filter on mine due to very tight access. What engines do you have?
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Old 12-18-2017, 07:27 PM   #7
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The boatyard mechanic showed me that back in the 90s. But then his hobby was full restoration of classic cars. They're obsessed with stuff like this as replacement engines are hard to come by. I've been doing it ever since, and have no idea if it makes a difference.

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Old 12-18-2017, 07:35 PM   #8
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I have a horizontal filter, no way you could fill it and then spin it on. That's why halfway, it still doesn't spill out half full. If I had a vertical filter I would fill it, that's what I do with my F-250.
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Old 12-18-2017, 09:14 PM   #9
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Hey FB. What engines do you have?


On my CAT 3208T/As I have two huge filters per engine. Not hard to get to and change. I fill my filters with clean oil before installing them. Reason? Not sure, just makes since as the oil pump would have to work harder to fill everything up and I hate the alarm. So if you can do it without making a mess go for it.
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Old 12-19-2017, 06:35 AM   #10
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On vertical filters with decent access, good to fill them. But not a big deal, especially if engine was last run an hour or two ago for the drain and fill. Bearings are well oiled from that last run.
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Old 12-19-2017, 06:44 AM   #11
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Quote:
Originally Posted by Comodave View Post
I don’t fill them. It would be almost impossible to fill the starboard engine filter on mine due to very tight access. What engines do you have?
Exactly my case .... 2 @ 6BT5.9M
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Old 12-19-2017, 07:18 AM   #12
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I always do on vertical filters. Some of my construction equipment have pre filter primers.
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Old 12-19-2017, 07:22 AM   #13
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Yes prefill on filters I can fill up without spilling plus just a little on the o ring always. Do that with any motor I service on road or off.

Better piece of mind for me. The oil pressure comes up a little quicker on that first start up instead of letting the oil pump fill it.
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Old 12-19-2017, 07:54 AM   #14
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Getting oil pressure up quicker is always a good thing, but not always possible based on filter installation.
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Old 12-19-2017, 09:50 AM   #15
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I have never seen a recommendation to prefill oil filters and I've been around a while. It seems like a good idea (well, it can't hurt) but my filters are horizontal so it's not possible.

Prefilling my fuel filters is possible and I do this so I don't have to bleed the fuel system.
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Old 12-19-2017, 10:06 AM   #16
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I shut off the fuel solenoid and crank until pressure comes up.
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Old 12-19-2017, 02:11 PM   #17
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Quote:
Originally Posted by AKDoug View Post
If you are like most and run your engine to warm the oil before draining it, I am pretty confident the residual oil will lubricate quite adequately as the filter fills and begins to circulate the new oil.... JMO
That's what I've done - the engine is always recently run and is still warm. Never filled new oil filters before installing in 6,500 hours on my Volvo, and it's doing fine. When engine is started after the oil change, oil pressure comes up really quickly. Same on my Cummins truck engine over 180K miles. I do fill fuel filters, however.
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Old 12-19-2017, 03:38 PM   #18
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Most engine wear takes place at cold startup or excessive cranking before starting. Dirty oil is the 2nd most common cause of wear.
Filling the filter probably helps, but also storing the new oil where it will be warm before changing also helps.
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Old 12-19-2017, 03:48 PM   #19
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It is possible to get a air lock in some filters and this can take ages of priming before reaching operating pressure .If the manufacture thinks its should be pre filled just do it
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Old 12-19-2017, 04:37 PM   #20
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Quote:
Originally Posted by Lepke View Post
Most engine wear takes place at cold startup or excessive cranking before starting. Dirty oil is the 2nd most common cause of wear.
Filling the filter probably helps, but also storing the new oil where it will be warm before changing also helps.
Lepke I’ve heard that over and over and over. But I don’t belive it.

If it was true all kinds of engine manuals would say to minimize how often you start your engine. Pre-lube systems would be standard equipment and great efforts would be made to minimize the no oil pressure time. Oil filter orientation seems to be of no concern to engine manufactuers. Little engines w splash oiling systems would self-destruct in very short periods of time. It dosn’t seem to matter at all if there’s several seconds w/o oil pressure.

HaHa but I do put oil in the filter can before screwing it on.
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