Counter balance shaft....

[seadoosnipe]

Here in the last couple weeks, there's been a lot of talk about the SAE 30# oil (1 ounce) that is put in the counter balance shaft assembly.
I have taken a couple pictures of my 787 engine that's all torn apart as Robin has suggested, so that all may get a better look. In the pictures, you'll notice on this model, the plug is a sealed type plug and cannot be removed for maintenance. Like others who have stated this, I too have no idea at what year Rotax made this oil chamber accessible by installing a removable plug.
The oil is used to lubricate the two drive gears, one on the crank and one on the balance shaft. They area (void) in which this oil is stored is very small. This oil lubricates these gears by being spashed onto them as the engine runs. The seal on the balance shaft keeps the oil from moving down the shaft toward the forward most bearing on the balance shaft and the crankshaft seals keep the oil from going into the crankshaft.
I hope I've put enough information on the pictures for all to understand. If you think that you need to see something from a different angle, send me a PM, I'll be glad to take a pix for you.................:cheers:

 

[scooper77515]

So, if there is no plug, do you just not change the oil? Or do you need to disassemble the engine periodically to change it?

 

[kustomkarl]

You do not have to do anything...if it doesn't have a plug.

 

[robin savell lloyd]

thanks louis you have all ready shead alot of light on this by your photos with illustrations. I had it all backwards as I thought the other end of counter balance shaft held the oil. it helps when you have one of these wright in front of you. robin

 

[mkov608]

Question

Is the 947 engine supposed to have oil to lubricate the balance shaft?

 

[mkov608]

Never Mind

Found the answer in the manual. 1.34 oz of oil for the balance shaft on the 947 engine, but since the front bearing exploded and cracked the case, all the oil leaked out. Then the engine ate itself. :ack:

Would have been nice to make the servicing requirement a little easier to identify, but since we bought the ski with the hole in the case already ... no big deal ... skis were cheap. The balance shaft fill plug for the oil reservoir looks like a bolt that holds the case together, and if I didn't have the engine out of the ski, I probably wouldn't have found it with the guidance from the Clymer manual.

Any body out there have some 947 cases or an engine they don't need?