-
This site contains eBay affiliate links for which Sea-Doo Forum may be compensated.
SeaDoo Counterbalance Oil Check
- Thread starter Haych
- Start date
- Status
If that model has a screw cap un screw it and see the level...I don't have a manual available to check your application,but you only have 2 options on all models. Either a screw cap or no cap at all.
Karl
Karl
Then you can't check it...you only need to add oil if you rebuild so it lubes it before fire up. It's capacity is like 1 oz if memory serves me right.
Karl
Karl
robin savell lloyd
Active Member
I can all ways be wrong so do your home work. On the 787 engines the oil is only added when rebuilding the engine after that it then gets it's oil from the oil injection threw oil passages in the crankcase. I beleive that you have the 947 engine in your ski and that oil stays in the chamber as the 787 does not. You need to check the oil at least every 100 hours to see if the seals are bad and if they are leaking. If seals are only leaking a litle you can just keep toping it off and keep a eye on it. When Rotax first came out with the 947 they used 30 weight oil and then I beleive that after 1998 they switched to synthetic jet pump lube probbly 75/90 I would use the jet pump lube in the old one's as well as the newer 947. :cheers:
I was thinking of removing the exhaust system to see the counterbalance fill hole, but it looks like its a bit of a job.
I've thought of using a mirror and a lead light to check, but even if I did use this method, I still couldn't put my hand behind the block to remove the oil fill plug.
I've thought of using a mirror and a lead light to check, but even if I did use this method, I still couldn't put my hand behind the block to remove the oil fill plug.
Balance shaft oil.....
Robin, since your statement is a two part statement, let me answer it in two parts. Yes, the oil in the older model 787's is only added at the time of rebuild or when they are put together. There is no way of checking this oil, since it is a sealed system. The other part of your question, about the engines oiling system keeping this oil in place, isn't entirely correct. Once this one ounce of 30 weight oil is installed, it is there till the next time you remove the engine.
The first year I found the plug, for checking and changing this oil was in the 1999 787 RFI engines. Once a season, you should remove this cap (located on the back side, left of the PTO hub) and check it for contamination. If needed, you will have to remove the drain plug, which is directly below that cap on the rear seal below the shaft (its a small allen head screw) and drain the oil entirely. Then re-fill with ONLY one ounce. That is very important. Oil expands as it heats up and if you put to much oil in it, you will push out the rubber seals and loose this oil. That will cause you to seize the gear cogs between the crank and the balance shaft. The gear cogs between the balance shaft and crank are timed. This one ounce of oil is in the bottom of the casing and uses a "spashing" affect to keep oil lubrication on these cogged gears.
There has been occasions where the balance shaft blew out of the side of the casing, due to those seals letting go, but that was probably due to the owner running the engine hot, softening the seals, allowing the oil to leak out.
All the 947's have this plug and from what I've read in the manuals, all the 787's from 1998 and 99 have this plug too.....it's a yearly requirement to check that oil and add if necessary.
I have pictures of the casing of the 787 opened up for this to be seen on my thread, "a look inside the 787"........look closely and you'll see the seals that seperate it from the rest of the engine.
In the earlier 90 model engines, the only place you saw it discussed, was in the engine section for removal and replacement of the crankshaft. In the newer models, you will see it in your yearly check sheet to inspect and replace this oil if necessary.
This counter balance shaft is an area of neglect. Those equipped with the plug, should do this once a year. That is a very important part of your motor and if overlooked, can cause terminal failure.
And please, what ever you do, ..........remember!......It's only ONE OUNCE!
Update. I've added this pix of the 787 balance shaft and seals, along with the cog gears. You'll notice, the only rubber oil seal is the one on the balance shaft itself, just below the cog. The other 3 seals are incorporated into the roller bearings. Looking at the thumbnail, the bearing and seal on top of the balance shaft and both, roller and seal bearings on the crankshaft.
I hope this visual gives you a better idea on how this is set up to work with the Rotax engines. Even though this is a 787, the 951 is practically identical.
Robin, since your statement is a two part statement, let me answer it in two parts. Yes, the oil in the older model 787's is only added at the time of rebuild or when they are put together. There is no way of checking this oil, since it is a sealed system. The other part of your question, about the engines oiling system keeping this oil in place, isn't entirely correct. Once this one ounce of 30 weight oil is installed, it is there till the next time you remove the engine.
The first year I found the plug, for checking and changing this oil was in the 1999 787 RFI engines. Once a season, you should remove this cap (located on the back side, left of the PTO hub) and check it for contamination. If needed, you will have to remove the drain plug, which is directly below that cap on the rear seal below the shaft (its a small allen head screw) and drain the oil entirely. Then re-fill with ONLY one ounce. That is very important. Oil expands as it heats up and if you put to much oil in it, you will push out the rubber seals and loose this oil. That will cause you to seize the gear cogs between the crank and the balance shaft. The gear cogs between the balance shaft and crank are timed. This one ounce of oil is in the bottom of the casing and uses a "spashing" affect to keep oil lubrication on these cogged gears.
There has been occasions where the balance shaft blew out of the side of the casing, due to those seals letting go, but that was probably due to the owner running the engine hot, softening the seals, allowing the oil to leak out.
All the 947's have this plug and from what I've read in the manuals, all the 787's from 1998 and 99 have this plug too.....it's a yearly requirement to check that oil and add if necessary.
I have pictures of the casing of the 787 opened up for this to be seen on my thread, "a look inside the 787"........look closely and you'll see the seals that seperate it from the rest of the engine.
In the earlier 90 model engines, the only place you saw it discussed, was in the engine section for removal and replacement of the crankshaft. In the newer models, you will see it in your yearly check sheet to inspect and replace this oil if necessary.
This counter balance shaft is an area of neglect. Those equipped with the plug, should do this once a year. That is a very important part of your motor and if overlooked, can cause terminal failure.
And please, what ever you do, ..........remember!......It's only ONE OUNCE!
Update. I've added this pix of the 787 balance shaft and seals, along with the cog gears. You'll notice, the only rubber oil seal is the one on the balance shaft itself, just below the cog. The other 3 seals are incorporated into the roller bearings. Looking at the thumbnail, the bearing and seal on top of the balance shaft and both, roller and seal bearings on the crankshaft.
I hope this visual gives you a better idea on how this is set up to work with the Rotax engines. Even though this is a 787, the 951 is practically identical.
Attachments
Last edited by a moderator:
- Status
