Rotax engine - where to get maintenance info?

[TahoeTim]

Where do I go for all things rotax?

Torque specs on the bolts, mount ring installation, care and feeding, etc...

I'm working on mounting the ring to my used engine and I see that the ignition parts that bolt next to the flywheel have some adjustment available. Is there a feeler gauge setting? Do the four bolts get safety wire or loctite? what bolts do I need and what torque of these four bolts?

With so many of these engines out there, I thought I would be able to find everything using google.

Thanks guys

[Av8r3400]

http://www.rotax-owner.com/en/

All engine manuals are here free on PDFs. All of the step by step details are in them.

[TahoeTim]

Thanks. I did visit that site a few hundred times. Is it worth the $30 to subscribe?

[Dave S]

Tim,

You do not have to subscribe to get the engine manuals.

Click on the link Larry provided

Go to the top of the page and select support/bulletins - go to engine manuals - you can download (or open and save to your computer) as many of the PDF manuals as you want...its free.

DS

[TahoeTim]

I understand the free areas and thank you.

I meant to ask if anyone subscribes to the site to get the extra goodies. Is that worth the $30. I may do it for one year.

[Dave S]

Tim,

Sorry...misunderstood your question:o

DS

[Peteohms]

I understand the free areas and thank you.

I meant to ask if anyone subscribes to the site to get the extra goodies. Is that worth the $30. I may do it for one year.


I subscribe. Very useful videos.

[jiott]

I subscribed for one year and found it very useful. Its nice to watch a video the first time you do a carb sync, a compression test, an oil purge, etc. After that first year I dropped it.

[TahoeTim]

that's my plan

thanks everyone

[hallschuch]

hi guys, I am also looking for the torque values for the ring mount/ engine interface for the 912 ULS and it seems the installation manual makes no mention --- any idea where I can find that?

[efwd]

Google AN bolt Torque values. Provided you can identify the bolt you will find all the torques this way.

[hallschuch]

thanks - I understand that I can find the torque values for the bolts, but my concern is for the casing

[jiott]

The light and heavy maintenance manuals are available for free download on the Rotax-Owner website.

[Dave S]

Karl,

IMHO - Rotax is almost as clear on making it easy to find specific torque values in their manuals as Mississippi mud at Midnight. Almost but not quite. I am very sympathetic towards anyone trying to wade through the manuals to find this stuff for the first time.

The very small section in the current heavy maintenance manual shows only generic specifications for 4, 5, 6, 8 and 10 mm fasteners with the little note to use these unless specified otherwise for a component, as far as I can see.

If there are no other directions for the 10 mm engine suspension bolts holding the ring mount to the engine block the values would be 28.5 foot pounds or 310 inch pounds.

When I got my engine, the documents distributed on disk with the specific engine showed a list of specific torque values along with the generic values for 4, 5, 6, 8 and 10 mm fasteners; however, the 10 mm engine suspension bolts holding the ring mount to the engine block were not listed separately so the generic value is what I used for the 10 mm bolts. I don't see the extended list in the current documents on the Rotax website, only the limited generic list for 5 sizes of metric fasteners.

Good luck.

[efwd]

I believe as I understand, were talking about the ring mount to the engine mount that has the Rubber mount interface. I looked at my 912iS installation instructions and found, and I quote. "Tighten each nut until the isolator washers contact the steel bushing, torque to 160 to 190 in-lbs. and secure with the cotter pin." That is verbatim from my install manual. Ill attempt to post a Pic of that page.

[jrevens]

I believe he's talking about the ring mount to engine, Eddie. The torque value for those 4 bolts can be found in the parts manual - 30 Ft. lbs.

Those plated, steel bolts are mated with tapped holes into aluminum. In my opinion, it is good practice to lightly coat the threads with anti-seize compound to help prevent any galling or corrosion

[efwd]

Thanks John. Your right.

[jiott]

Most torque values, unless specified otherwise, are for dry threads (no lubrication). Anti-seize compound will act as a lubricant, which may cause an overtorque situation if you use the same torque value. I don't know if this is very significant or not, but I bring it up anyway because some folks may not pay any attention or realize that a torque spec always includes a "dry" or "lubed" condition.

[hallschuch]

Thanks Dave - really appreciate your help!

[jrevens]

I believe he's talking about the ring mount to engine, Eddie. The torque value for those 4 bolts can be found in the parts manual - 30 Ft. lbs.

Those plated, steel bolts are mated with tapped holes into aluminum. In my opinion, it is good practice to lightly coat the threads with anti-seize compound to help prevent any galling or corrosion

Dave’s comments about Rotax recommended torque values are exactly right... don’t know why they had to make it so hard to find in the past, or why they changed. The value I mentioned above (30 ft. lbs.) was directly out of the parts manual only a few years ago when they used to publish many torque values there (Section 71-20-00, p.3). They have obviously changed the recommendation since then and Dave’s info is correct & accurate, as usual. Use the standard values listed in the current Heavy Maintenance Manual (28.5 ft. lbs.). I’m sorry to have added any confusion to the conversation. :confused:

As far as using anti-seize, Jim is absolutely correct (as usual also!). I still personally think it’s a good idea in this situation, and I believe it was also recommended to me by Kitfox. I’ve seen adverse results of steel bolts in aluminum multiple times over the years when doing engine work. I think it’s unlikely there would be any adverse over-torque, especially since there were thousands of engines probably using the higher published torque value for years, and it is now lower to begin with. As always, these are just my personal thoughts and people have to make up their own minds.

[Dave S]

John,

There is a very small difference between 30 and 28.5 foot pounds - that difference is so slight that it is insignificant considering the pitch of the threads and the diameter of the bolts.

As you mentioned, Rotax has changed a number of their specs - all very minor - such as the spark plugs were 177 inch pounds (cold) once and now it is 180 inch pounds (cold) - again insignificant differences. Then there are the cylinder head nuts - once a specific torque was given and now they list a lower torque followed by a specific number of degrees rotation after - my guess is the final results are pretty similar.

If a person looks at the small differences as a percentage change rather than an absolute amount, it is easy to realize that other factors affecting torque are probably larger (wrench calibration, temperature of the parts, differences in condition of the thread surface.) We try to measure what we can to get as close as possible and then accept, by necessity, that absolute precision is a near impossibility.

In the end, we are all good.

[jrevens]

Dave,

Good point. Going to “standard” torque values in more instances may have been at least partially driven by an effort to address one of the shortcomings in the manuals... “hiding” torque values all over the darn place!