787 crankcase oil

[fastscottie]

hi,

i recently removed the top end to replace the pistons and rings. after the top end was removed, i turned the bottom end over to empty out all the oil that was in the crankcase. the reason was to remove pieces of broken rings that might have fallen in there. i have put the top end back together, but does not know where or how much oil to put back in the crankcase. does anyone have an answer to this? thank you for your help.

 

[seadooya]

no oil in the crankcase. Fill the oil resivoir up, and it'll "fill" the RV cavity, which you'll see oil then rise in the return line.

Unless your talking about the counterbalance cavity, then fill that up with 1oz of premix/injection oil.

 

[fastscottie]

thanks seadooya. how can i tell which is the oil return line? can u see oil in the return line even with the engine off? can u safely assume that the oil pump is working if there is oil in the return line? thanks again.

 

[seadooya]

from your res. bottle, you got 2 feed lines. 1 for the oil injection pump, that one has an inline white filter, and the other feed line, goes to yuor RV assy.

With the oil in the resivoir, you'll see then the "return" line start to fill up, which this hose is located on top of the resivoir.

Depending on how you went about doing the topend, whether you removed everything as far as carbs, oil lines...etc, then you'll need to re-bleead the injection system. With oil bottle full, the line with the filter will fill up to the oil pump, then with ski at idle, hold the injection pump arm to "prime" the little lines, BUT prior to that, you'll need to crack the "nut" at the injection pump to bleed the feed line of any air..etc.

 

[fastscottie]

i did remove the carb and oil lines. i did not bleed the oil and have run the engine already. is there any harm in running the engine without bleeding the oil? thanks.

 

[kustomkarl]

If you run the engine without bleeding the injector lines the engine will be running on straight gas, and the engine will not get any lubrication from the injector, and it might seize up. Bleed the injector line till it runs out of the pump. Start the engine and turn the cable disk to full on the injector at idle and it will fill the oil lines with oil, to the engine. I hope this helps out.

Karl

 

[fastscottie]

thank you guys for the great advices. i will try all the above and will let u know how things go.

 

[akwroclaw]

Bleed the injector line till it runs out of the pump. Start the engine and turn the cable disk to full on the injector at idle and it will fill the oil lines with oil, to the engine.
Karl

Im not so good in english: what does it mean:
"turn the cable disk to full"
if i don't use injector/mixer why do I do that?
Is this injector also a pump for engine-bottom??


I have the similar situation. Injector is blocked and it's line is closed. I have two oil lines: input and output one fitted to the two sides of the engine. I rotated the crankshaft with electricity only to pump the oil through the engine. But the oil was not pumped enough to be returned to the reservior. The oil in output line from the engine was stopped as if there were no oil pump.

What is the situation?
- is there a oil pump in the cranckase and it's blocked, broken or sth?
- there is no oil pump in the engine between lower oil intake [below carb] and lower oil out [in the lower part, on the opposite side], but how would the low-engine parts be lubricated then? it means - it needs additional pump or sth?


Thanks for your help.

 

[bigJake]

Im not so good in english: what does it mean:
"turn the cable disk to full"
if i don't use injector/mixer why do I do that?
Is this injector also a pump for engine-bottom??


I have the similar situation. Injector is blocked and it's line is closed. I have two oil lines: input and output one fitted to the two sides of the engine. I rotated the crankshaft with electricity only to pump the oil through the engine. But the oil was not pumped enough to be returned to the reservior. The oil in output line from the engine was stopped as if there were no oil pump.

What is the situation?
- is there a oil pump in the cranckase and it's blocked, broken or sth?
- there is no oil pump in the engine between lower oil intake [below carb] and lower oil out [in the lower part, on the opposite side], but how would the low-engine parts be lubricated then? it means - it needs additional pump or sth?


Thanks for your help.

the lines from the oil tank to the bottom end are just gravity fed. the oil level in the return line should be level with the oil in the tank

 

[akwroclaw]

oil leveled overnight, so we decided to run, and it goes! :thumbsup:

thank you for your reply!