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Engine overhauled

  • Arash
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1 month 3 weeks ago #21315 by Arash
Engine overhauled was created by Arash
Dear All
I've bought overhauled rotax 912S recently. Im little concerned if they engine shop done overhauled at all because I can't see any new seal on engine. how can I make sure if they done overhauled? in documents they conform overhauled but it might be fake!!
Thanks

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1 month 3 weeks ago - 1 month 3 weeks ago #21335 by Roger Lee
Replied by Roger Lee on topic Engine overhauled
They have had to have used a fairly large list of parts. Ask them for that list. Then they had to have taken a lot of measurements, ask them to see the pages of written measurements. Ask where they got their overhaul kit and then call and see if that was true. Rotax Service centers are usually the only ones capable of doing full engine overhauls. Look at the logbook label. It should be specific as to what they did. If it is just a 3 line label, no parts list and no measurements then I'd be doubtful to. Find out the person's name that supposedly did the overhaul and have a Rotax Service center person call him and ask him questions. I have done this for a few companies where an A&P was supposed to have done things like an annual and then found out they did a garbage job and failed to do 2/3 the work and said it was an annual to just get the money. These people all got their money back and some sales were lost. There are experts out there you can use.
This is also why good documentation is important to both parties.

Roger Lee
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Last edit: 1 month 3 weeks ago by Roger Lee.
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1 month 3 weeks ago #21347 by Wang Shu
Replied by Wang Shu on topic Engine overhauled
Dear Roger Lee,
hi ,
Crankshaft, connecting Rods replacements are necessary on first overhaul or It is also depend on measurment.?

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1 month 3 weeks ago #21348 by Roger Lee
Replied by Roger Lee on topic Engine overhauled
measurements

Roger Lee
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1 month 3 weeks ago - 1 month 3 weeks ago #21354 by Arash
Replied by Arash on topic Engine overhauled
This IS Picture of engine situation

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Last edit: 1 month 3 weeks ago by Arash.

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1 month 3 weeks ago #21355 by Arash
Replied by Arash on topic Engine overhauled
Dear Roger Lee
Thanks for your information and quick reply, attached you can see some picture of engine, Please let me know what do you think about it
Also because I have Rotax S series, there is spot on the body of engine with oil leaking. Do yo have any idea how we can fix it ?

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1 month 3 weeks ago - 1 month 3 weeks ago #21357 by Roger Lee
Replied by Roger Lee on topic Engine overhauled
You're right it doesn't looked like it's been overhauled or had the case split. Looks like the wrong sealant for the gearbox to. All the dirty oil stuff looks old and never cleaned off. The magnetic plug isn't safety wired and neither are the exhaust springs and no silicone on the springs. Take a close look at the hoses and see if all look new.

Roger Lee
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Last edit: 1 month 3 weeks ago by Roger Lee.

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1 month 2 weeks ago #21364 by Arash
Replied by Arash on topic Engine overhauled
Dear Roger Lee
Thanks fo your answers, do you have picture of a good overhauled engine .
Thanks

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1 month 2 weeks ago #21366 by Roger Lee
Replied by Roger Lee on topic Engine overhauled
Sorry I don't.

Roger Lee
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1 month 4 days ago #21544 by Wang Shu
Replied by Wang Shu on topic Engine overhauled
Roger Lee, Hi, after overhauling , what type of QUALIFICATION tests are required for 914/912 Engine.?

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1 month 4 days ago #21546 by Roger Lee
Replied by Roger Lee on topic Engine overhauled
No special qualification. Do a really good oil purge ( I'm paranoid so I usually do 2) and run it and make sure right up front that engine pressure and the like are all good.

Roger Lee
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1 month 3 days ago #21547 by RobSeaton
Replied by RobSeaton on topic Engine overhauled
I think Wang Shu means what qualification tests are done after assembling an overhauled engine?
-Oil purge including lifter test after short idle run.
-Warm up engine
-ignition "mag check"
-Break-in procedure carried out in 5 min "steps" at listed RPM settings.all parameters checked
-Performance check. 5 min full power run to check horsepower & all parameters recorded and checked. Followed by 5 min steps of 500rpm segments, lowering RPM to 3500rpm
-Cooling down run
- Stop engine and check for any leaks
-Cut open and section oil filter
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1 month 3 days ago #21549 by Roger Lee
Replied by Roger Lee on topic Engine overhauled
yep I completely misinterpreted that one.

Roger Lee
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3 weeks 1 day ago - 3 weeks 1 day ago #21678 by Wang Shu
Replied by Wang Shu on topic Engine overhauled
Excellent.B) ?
Last edit: 3 weeks 1 day ago by Wang Shu.

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3 weeks 1 day ago #21679 by Wang Shu
Replied by Wang Shu on topic Engine overhauled
Excellent.
After TBO / overhauling, testing of engine is required on dynamo meter.?
Or else any other qualifications procedure? Like testing with propeller

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3 weeks 1 day ago #21680 by Bill Hertzel
Replied by Bill Hertzel on topic Engine overhauled

RobSeaton wrote: ...
-Break-in procedure carried out in 5 min "steps" at listed RPM settings. All parameters checked
-Performance check. 5 min full power run to check horsepower & all parameters recorded and checked. Followed by 5 min steps of 500rpm segments, lowering RPM to 3500rpm ...


Where can we find the Break-In Procedure for the 912/914 engines?
I have looked in the Line, Heavy, and Operators Manuals for the 912/914 engines.

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3 weeks 18 hours ago #21681 by RobSeaton
Replied by RobSeaton on topic Engine overhauled
It is only found in the overhaul manual. It is not necessary to repeat the break-in, even if you replace all the cylinders and pistons.
Yes, a calibrated propeller or dyno is required.
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1 week 3 days ago #21796 by Wang Shu
Replied by Wang Shu on topic Engine overhauled
914 UL Date of. Birth 2007 can converted in to 914 F after overhaul? please guidance required.

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1 week 3 days ago #21797 by RobSeaton
Replied by RobSeaton on topic Engine overhauled
Absolutely not!
You cannot certify a UL engine, the certification process begins long before the engine is assembled at the factory.

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1 week 2 days ago #21807 by Wang Shu
Replied by Wang Shu on topic Engine overhauled
Ohhhh,
I does not mean To certified engine.
I just make equivalent to 914 F. And in service able condition after 2007 that was stored.
No legal requirements .
No certificate Required.
Then ?

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