Mandatory ALERT Service Bulletin: Inspection and Replacement of Oil Spray Nozzle for ROTAX® Engine Types 912 i, 915 i, and 916 i (Series) SB-912 i-016 / SB-915 i-016 SB-916 i-006

I printed it in ABS and it came out good. I didn’t completely assemble it as I didn’t have the other parts and my engine doesn’t require it. It only took about 1.5 hours to print. It could easily be altered to be 90 degrees on the back.

My test tool is complete, but the O-Ring for the 912iS is backordered at all US Rotax distributors and not expected for 30 days.  Who could have anticipated that 😬.  The 912iS O-ring is specified as:  2.5mm CS, 18mm ID, Material is Viton-75. They are available from other sources if you don’t need it to come with a Rotax part number.  

Jeff Blakeslee wrote:

My test tool is complete, but the O-Ring for the 912iS is backordered at all US Rotax distributors and not expected for 30 days.  Who could have anticipated that 😬.  The 912iS O-ring is specified as:  2.5mm CS, 18mm ID, Material is Viton-75. They are available from other sources if you don’t need it to come with a Rotax part number.  

Jeff,

 would you mind sharing the various part numbers you used for tool o-ring, fittings, gauges?

thanks,

Harry. 

Hi Harry

Regulator and flow meter at links below:

https://www.amazon.com/dp/B01BPQDG62?ref=ppx_yo2ov_dt_b_fed_asin_title&th

https://www.amazon.com/dp/B07DNW6JHX?ref=ppx_yo2ov_dt_b_fed_asin_title

Since the Rotax crankshaft plug o-rings are on national backorder, I ordered a pack of 10 of these (link below). I have not received them yet so I can’t vouch for proper fit but they are the exact same spec. Probably some folks are putting the original back in - not the best practice but it probably would be fine.  

https://www.amazon.com/dp/B005RUSMJ4?ref=ppx_yo2ov_dt_b_fed_asin_title

The flow meter I suggested has 8mm nipples and will fit (tight) with 1/4” ID rubber or vinyl tubing. The regulator has 1/4” NPT threaded  hubs so you can get what ever hose barb fittings you want as long as they have 1/4” NPT threads.

I adapted down from 8mm at the flow meter output so I could run vinyl 3/16 tubing to the insertion tool. I did this because I wanted this tubing very flexible so the tube did not put any pressure on the tool when inserted in the crankshaft. The other way to go would be to use really flexible 1/4 tubing like silicone which will push right on to the flow meter nipple.  Remember, you are only using 4 PSI, and you don’t want to be fighting stiff tubing when inserting the tool.

I bought the Omnav print file and printed my own insertion tool.  At the time I did not realize he was selling the actual printed tool for 1/2 the cost of the print file, but buying the pre-printed tool is a better way to go for a single use. If you go that way it comes with the O-ring and 1/4” hose barb.  If you are printing your own, you will need an O-ring.  I don’t know about other printed tools, but the O-ring I used is 1/4” OD, and 1/16” thick, I believe this is size A006 and most O-ring kits have this size. I used a Viton-75 O-ring, which has a durometer of 75. I have not tested it on the engine, but that was the recommended size for the tool I printed.

I also designed and printed the backplate and hook so the flow meter and regulator can be hung on the engine mount.  If you have a printer I can post that file.  I probably overkilled it, but have a few engines to test and I did not want to be fighting the thing. 

What is the best way to get ahold of Omnav in order to purchase the printed tool kit?