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Old 03-29-2018, 04:50 PM
Bad1996 Bad1996 is offline
Join Date: Feb 2017
Location: Dalton, Ga
Posts: 40

Originally Posted by Piper J3 View Post
Best not to burp engine with oil tank drained. You will suck air into the oil pump which can cause problems with hydraulic lifters. Burb engine prior to draining oil tank, change filter, refill the tank with 3 liters, and fly.
Interesting thought. Any instructions from Rotax or articles you can link to ?
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Old 03-29-2018, 05:18 PM
aerofurb aerofurb is offline
Join Date: Jul 2009
Location: High Wycombe, UK
Posts: 282

From the 912 Line Maintenance Manual

Section 12-20-00 Page 48

11.1) Lubrication


Draining the suction lines, oil cooler and return line is not necessary and
must be avoided, as it results in air entering the oil system. Therefore
see and carry out SI-912-018. See also chap. 12-20-00 section 11.6)

Section 12-20-00 Page 49

11.2) Oil Change


The engine must not be cranked when the oil system
is open. When the crankshaft was turned, then the oil
system must be purged.

12-20-00 section Page 56



Purging the oil system is necessary:
- before each first start up (e.g. after overhaul)
- after maintenance work during which the lubrication system was
opened and voided.
- when engine was cranked with open oil lines (e.g. during oil change). (my bold)
- when oil system or oil lines were blown through with compressed air.

SI-912-010 Oil Change

3.1) Instructions

CAUTION: Do not turn the engine if any part of the oil system is open. Observe this also during first installation of the engine (e.g. when mounting the propeller, after the oil system has already been correctly vented).

I think it is safe to assume that an emprty (drained) oil tank counts as an open system which could allow air into the oil system.
Jerry Parr

Loving Rotax....
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