Oil injection nozzles

[Britrick]

Hi
I'm just getting my 787 engine ready to go back in its xp hull , I changed all the hoses on it to make it look a bit better . The two thin clear hoses that run from the pump to the inlet nozzles , I just replaced those , should you be able to blow though the pipe from the pump end ? Mine seem to be blocked or is there some kind of valve inside these nozzles ?
Thanks

 

[SabrToothSqrl]

Your mere human lungs can't generate enough force. Sorry.

 

[Britrick]

Lol , that's ok then so long as they arnt blocked .

 

[SabrToothSqrl]

If you wish, you can use a drill to test and prime the oil lines.

 

[RodInEscondido]

Your mere human lungs can't generate enough force. Sorry.

Sabr ... the proper method here is suck, not blow ... keep smiling.

I know this is a little different from the 580/720 banjo fittings on the oil pump, but I would take a guess that the operation is similar.

On the ones I have tested, a little less than 5 inches of vacuum from my brake tester allows flow toward the engine. There is a check valve inside to prevent flow back into the oil pump. I have been putting the pump end into clean solvent and pulling solvent thru to clean them. If the check valve keeps the solvent from going the other way I make the assumption that it will work just fine with oil. At end of test I suck a little of the proper oil into the fitting.

cheers

Rod

 

[Britrick]

Sabr ... the proper method here is suck, not blow ... keep smiling.

I know this is a little different from the 580/720 banjo fittings on the oil pump, but I would take a guess that the operation is similar.

On the ones I have tested, a little less than 5 inches of vacuum from my brake tester allows flow toward the engine. There is a check valve inside to prevent flow back into the oil pump. I have been putting the pump end into clean solvent and pulling solvent thru to clean them. If the check valve keeps the solvent from going the other way I make the assumption that it will work just fine with oil. At end of test I suck a little of the proper oil into the fitting.

cheers

Rod

Hi
Im not really sure if "5" of vacuum "is alot or not?
Thinking about it there must be a valve in the nozzle so as to stop oil draining into the inlet manifold when not running , but if it takes that much pressure to overcome the valve then im surprised the pipes which are only push fit ,dont pop off.

 

[RodInEscondido]

on the ones I have tested I have been able to attach a long enough piece of the tygon oil line to keep any residual oil out of my mouth and suck/blow to initially check that the check valve opens/closes ... 5 inches of vacuum is not very much.

Rod

 

[Britrick]

Mmmm that's the same as I have done and I can't suck/blow on either of the valves , they are just solid . Got me worried now , don't want to put the engine back in if they are faulty .

 

[dsteinmann]

I Also just tried this the other day while reassyembling my 951, I oculnt do it either i did blow some air through them with the air compressor. I think it normal

 

[RodInEscondido]

Mmmm that's the same as I have done and I can't suck/blow on either of the valves , they are just solid . Got me worried now , don't want to put the engine back in if they are faulty .

Good decision, but I only have access to 580 and 720 engines. Need input from a pro, ya currently have 2 votes that it might be normal. I will be backing out of this one as I do not want to be giving bad advice. Good luck.
Rod

 

[Britrick]

Quick update, took the carbs back off and put a spare piece of tube over the outlet end of the nozzle and it was quite easy to suck the nozzle open , got some crappy old oil out as well .so the moral of the story is ,suck dont blow !
I reakon it would be quite easy to prime those new lines this way as well, so may leave the carbs off till last.

 

[SabrToothSqrl]

I use a cordless drill and the oil pump to prime the lines. Either that or you can add a bit of oil to the engine, remove the spark plugs, hold the throttle wide open, and just use the starter to prime the lines. That spins the oil pump around 1,000 RPM since there's no load on it. and WOT will open the oil pump all the way.