Engine Priming Question

[pistonbroke2]

I've been reading more and more about boxer engines going pop shortly after the oil gets changed. I've read that filling the oil filter prior to fitment, and priming the engine by cranking while CPS is removed to flow the oil round the engine while not under load.

Is this something that has to be done on all variant imprezas, or is it certain models or years that are more susceptible to the problem?

[granby]

Definitely pre fill the oil filter (should do this on any engine)

I've also read about cranking the engine over while CPS is removed but that has never been done on my engine whenever it's been serviced

[pistonbroke2]

I'll be doing it on the scooby, as the oil filter is vertical. Every other car I've had has had side on oil filters which would make pre filling them rather messy

The general and technical forums of this site have got several posts of the same nature, in that peoples engines have started knocking after a service has been done. It just made me a little concerned.

Thanks for the reply though Mate.

[dazzlers82]

as granby said you should always pre fill filters if possible an i have also heard about disconnecting cps an i do on mine but to be honest when your car has been standing for a week an you start it do you disconnect it then ?????????????

as its no different to changin the oil it all goes into the sump its prob safer when oil changing than it is if you leave for a week before driving

[eurosti]

As per my post in General lol

[granby]

  dazzlers82 said:

as granby said you should always pre fill filters if possible an i have also heard about disconnecting cps an i do on mine but to be honest when your car has been standing for a week an you start it do you disconnect it then ?????????????

as its no different to changin the oil it all goes into the sump its prob safer when oil changing than it is if you leave for a week before driving

Thats a very good point Daz never thought of it that way

[Deano 666]

  dazzlers82 said:

as granby said you should always pre fill filters if possible an i have also heard about disconnecting cps an i do on mine but to be honest when your car has been standing for a week an you start it do you disconnect it then ?????????????

as its no different to changin the oil it all goes into the sump its prob safer when oil changing than it is if you leave for a week before driving

. Also by cranking your engine with the c/s sensor disconnected it will bring up a fault code in you memory, and it will stay there untill it is cleared. it may even bring on the MIL

[granby]

  Deano 666 said:

. Also by cranking your engine with the c/s sensor disconnected it will bring up a fault code in you memory, and it will stay there untill it is cleared. it may even bring on the MIL

MIL?????

[emoe]

Theres a lot of cars nowadays that prefilling just isnt possible.

The reason behind pre-filling was to eliminate the initial start up friction in engines of old. They used to have a lot of metal contact (large gap between surfaces allowing the oil to drain away quickly) and the oil pumps took a good 5 or 6 seconds to get oil back to the main journals, and the head. Nowadays within 1-2 strokes there is plenty of oil pressue.

That said its ALWAYS a good idea to pre-fill if you can.

If you are changing the oil, and the car is only drained and then refilled within 10 or 20 minutes, the oil film left behind from before will remain and the oil will be pumped back there before that has a chance to dispel from the component.

i would say that 60% of the cars i work on have lateral filters or USD cartridge type, making prefilling impossible.

Also removing the CS or CamS and cranking CAN put the CEL light on and on Renaults can result in the management backstalling and causing some problems when yo do start it.

best thing to do in any situation is to change the oil and filter and refill and run the engine straight away.

If the car is going to be left without oil in the engine, then remove the spark plugs, a couple of Squirts of good engine oil, and replace the plugs or bung the holes.

Then when it comes time to re-fill and start the engine, pull the bungs, refill the engine with fresh oil, then leave ignition OFF and turn the engine over a couple of times manually, (can be done either with a nice tool like mine that hooks a separate battery to the starter motor or you can tow it for 20-30 yards)

[Deano 666]

  Granby said:

MIL?????

malfunction indicator light, or cel to you subaru people.

[granby]

  Deano 666 said:

malfunction indicator light, or cel to you subaru people.

[Deano 666]

  Granby said:

Ian you can learn something new evey day

[mikkers]

  Deano 666 said:

Ian you can learn something new evey day

So you CAN teach an old dog new tricks.