Prefill Hydraulic filter, yay or nay??

[Soundguy]

With all the oil drained and sitting for a while, and no oil in the filter can cause problems. Normally when your engine has set a long while, there is oil in the filter. When the oil is drained and all residual oil has drained down into the pan, that thin film of oil left can get scorched or removed by movement before the oil filter fills and lubes the whole engine with a thick film of oil.

This is why new engines have to be prelubed by turning the oil pump with a shaft on a drill before first start up. So if you have have an empty oil filter.................and let the engine set for a long period, it can make it worse on start up.
hugs, Brandi

or just use assembly greae .. not all engines can be prelubed with a drill.

ever try that on a ford flathead in an N?

oil pump is driven at the front main...

soundguy

 

[BlacknTan]

With all the oil drained and sitting for a while, and no oil in the filter can cause problems. Normally when your engine has set a long while, there is oil in the filter. When the oil is drained and all residual oil has drained down into the pan, that thin film of oil left can get scorched or removed by movement before the oil filter fills and lubes the whole engine with a thick film of oil.

This is why new engines have to be prelubed by turning the oil pump with a shaft on a drill before first start up. So if you have have an empty oil filter.................and let the engine set for a long period, it can make it worse on start up.
hugs, Brandi

Not really...

Not all wear points of an internal combustion engine are pressure fed directly. Many points are drip lubed as the oil works it's way back to the pan. Rocker arms are lubed by splash from the lifters through the pushrods as just one example.
Prelubing a new engine is to build oil pressure before that first critical start-up. High wear points are pre lubed at assembly with break-in lubricants. It just not make sense to wait for pressure to build as with an empty filter after an oil change.

 

[bindian]

Not really...

Not all wear points of an internal combustion engine are pressure fed directly. Many points are drip lubed as the oil works it's way back to the pan. Rocker arms are lubed by splash from the lifters through the pushrods as just one example.
Prelubing a new engine is to build oil pressure before that first critical start-up. High wear points are pre lubed at assembly with break-in lubricants. It just not make sense to wait for pressure to build as with an empty filter after an oil change.

Uh, I think we are thinking the same thing, yet saying it differently.
Please forgive me as I only have recent jet engine knowledge. I have rebuilt piston aircraft, car, and truck engines, but it was many years ago and I have slept since then.
hugs, Brandi

 

[MHarryE]

Working for a major engine manufacturer, we had one engine model that was losing unit injectors at an incredible rate, especially in Asia where the fuel really sucks but Southeastern USA isn't a whole lot better. After a looking over a lot of customer's shoulders, we found the problem to be the dirty fuel they used to pre-fill the filters, and they went through a lot of filters with their bad fuel. Remember, you are usually filling the clean side, not the dirty side, of the filter on a canister type filter. Somebody's idea was to mount one of the filters (this engine used 1 water separator and 2 fuel filters) upside down so customers couldn't prefill the last one. It resolved the injector wear problem but customers were pissed because of the fuel spilling out when changing filters. Solution used on the next engine series was to put a symbol on the replacement filter can that if you can figure it out says not to prefill. As for oil filters, new oil isn't the cleanest but it is getting refiltered continually, not one pass and it's used up like fuel.