Today's Message Index:
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1. 07:09 AM - FW: 503 pressure test question. (Jack Carillon)
2. 03:15 PM - rotax 912 crankshaft (ndibiase)
3. 06:17 PM - Re: rotax 912 crankshaft (jetboy)
Message 1
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| Subject: | FW: 503 pressure test question. |
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*From:*Bob [mailto:rcarillon@neo.rr.com]
*Sent:* Wednesday, October 27, 2010 11:00 PM
*To:* 'info@leadingedgeairfoils.com'
*Subject:* 503 pressure test question.
Hi my name is Bob.
I was hoping someone could answer a question on pressure testing the
crank case on a 503 DCDI Rotax to check for seal leaks.
My question is, is there a seal in the middle of the crank to completely
seal the front half of the engine from the rear half? By looking
In the parts manual there does not appear to be that type of a seal too
completely seal a cross feed in the crank case.
I am asking this question because we made four in block off plates for
both intake and exhaust ports. So I blocked off all four
ports and put the gauge and pressure in the mag side intake port to 7
psi. The pressure did not hold. So then I started checking
with soapy water to see if my plates were sealed. I used old gaskets and
the plates were leaking. The thing I noticed was the PTO
block off plates were leaking air even though I was pressure testing the
mag end of the crankcase. I have been told by one guy that
the center crank shaft seals are leaking. Is this true or are they
suppose to cross feed to lubricate the center crank shaft bearings?
When I put new gaskets on all four block off plates the engine held 7
psi and 16 inches of vacuum for 10 min and only changed readings
of maybe a half needle width. So no case or mag/pto seal leaks. I am
thinking I have been given inaccurate info on this test for a 503 but
maybe correct for a water cooled 582. Thankyou in advance for any help
and if you cannot answer my question then would you be able
to give me a contact of someone who might.
Thanks again,
Bob
Message 2
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| Subject: | rotax 912 crankshaft |
Until recently i believe that rotax 912 crankshaft was bomb proof.
But, after speaking with other owners of this engine, i was warned that there had
been some failures on crankshaft for overspeed, early wear etc.
Because rotax 912 crank is composite (almost incredible for a 4 stroke engine of
so high price) i'd like to know from rotax list experience if someone else has
experienced crankshaft problems on his 912 engine.
I am specially interested in knowing witch are the symptoms, if failure is sudden
or if it is people that has flied for a long time with partial compromised
crankshaft etc.
thanks
Nicola di Biase
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=317440#317440
Message 3
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| Subject: | Re: rotax 912 crankshaft |
http://www.atsb.gov.au/publications/investigation_reports/2007/AAIR/pdf/aair200700054_001.pdf
--------
Ralph - CH701 / 2200a
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=317449#317449
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