Prefilling filters - Page 2 - The Combine Forum
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post #11 of 21 (permalink) Old 09-09-2018, 01:45 PM Thread Starter
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Usually throw a magnet on the side too. Quite cheap and harmless if it works or not.
That's a really really good idea!

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post #12 of 21 (permalink) Old 09-09-2018, 02:37 PM
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Some oil filters I fill some I don’t. Fuel filters I fill if it doesn’t have a way of priming them. Cummins you have to and it says so in the book to do.

I have yet to hear of any engine getting rebuilt as a result of filling or not filling an oil filter as the main cause. Be carful and should be fine.

I’ve seen guys get more dirt in a filter trying to get it on an awkward spot and not having it clean and the engines are still going.

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post #13 of 21 (permalink) Old 09-09-2018, 03:23 PM
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Cummins service manual says to fill the oil filter, some engines you can't because the oil filters or horizontal or upside down.

As long as the fuel system has a good primer, I am too lazy to walk to the diesel tank to fill the filters - that, and most of our tractors have horizontal fuel filters.

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From what I've gathered from other new JD equipment and what seems to be a huge concern is "How big is the fridge" and does it keep your wobbly pops cold enough ??
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post #14 of 21 (permalink) Old 09-10-2018, 12:01 AM
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Filled if and when possible.

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post #15 of 21 (permalink) Old 09-10-2018, 12:45 AM
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Oil filters? I dont fill them but won't say not too but keep in mind oil is on average 7 times cleaner coming out of the engine than going in. Yes, that stuff on the bottom of your oil jug is dirt.

I never fill a fuel filter and highly recommend not doing it. Years ago you could get by with it because at the low pressures and relatively large holes in injectors you could just about run a corn cob through.
These days, especially since the advent of common rail injection pressures are many times higher and if a particle of the right size makes it through the system it can actually do piston damage! Unbelievable I am aware but imagine the velocity of the particles coming out of that little hole with injection pressures approaching 40,000 psi with a aluminum piston headed it's way at however many feet per second
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post #16 of 21 (permalink) Old 09-10-2018, 01:09 AM
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I've never filled an oil filter with oil. If I can I'll shut the fuel off and turn the engine over until the oil pressure comes up before starting it. I've had to put fuel in filters because they would not prime otherwise. If the engine has some kind of primer pump, I never do.
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post #17 of 21 (permalink) Old 09-10-2018, 03:55 AM
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I can't remember for the life of me, but one of my units says not to fill fuel filter.. I think it was a Deere sprayer?

Anyway, I never prefill anything, always ends up a mess, and even with an empty fuel filter, the engines never get airlocked, I guess there is plenty enough fuel in the lines to keep it going until filter is full. Also with the advent of the low pressure hv pumps to precharge the hp fuel rails, no need anymore.
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post #18 of 21 (permalink) Old 09-20-2018, 11:41 AM
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Filling fuel filters with ATF or 2 stroke oil may have been ok 30 years ago but do not do that on modern diesel engines..... as it was mentioned earlier the injector holes are much finer and more precise than that of an old 2 stroke slobbering Jimmy.
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post #19 of 21 (permalink) Old 09-20-2018, 01:04 PM
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I pre-fill everything I can. Maybe not the top 1 inch of the filter - except fuel filters. They get filled to the brim and overflow onto my hands - big deal! All fuel on our farm is pre-filtered before going into an engine. We have filters on the bulk tank and filters on slip tanks. So when a filter is filled, it is already with filtered fuel. I have had too much time playing with nonworking manual prime pumps and cracking injectors and making messes all over the engines than to not pre-prime and rely on unreliable systems!

I believe oil filters should be pre-filled when they can be. I believe the time of initial startup is a time when metal to metal contact in engines occur and engine life is decreased when this occurs. A rule of thumb is that an engine which is running all the time generally last longer between rebuilds than engines that are started and stopped often - especially in cold climates.

I think a much bigger consideration is overworking an engine. If you turn up pumps and use engines harder than their design specifications, you will have to rebuild the engine more often than if it is allowed to run at lets say 3/4 of its full power load. In these cases the load placed on an air filter can also cause an engine to ingest more dirt IMO when it is sucking harder and struggles to get air into the combustion process - a dirty burn!

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post #20 of 21 (permalink) Old 09-21-2018, 09:25 AM
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Always fill oil filters if you can. You don't need to fill by pass filters though, like the LF777.
Don't fill fuel filters if you can pump them up. Remember to use grease on the fuel filter gaskets.

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