Minor coolant leak on 912ULS
I have a minor coolant leak and it *appears* to be coming from the pump, but I am not 100% convinced. This post was very helpful in locating other places that the leak might be coming from:
https://www.rotax-owner.com/en/912-914-technical-questions/9644-coolant-leak_1
If the leak is coming from the weep hole and its minor (a coolant top off every 50hrs or so), it sounds like it might be ok.
First question - where is the weep hole exactly? I have searched all the Rotax manuals and cannot find it mentioned anywhere. Is it basically where #13 is pointing in the illustrated parts guide (attached)?
Second question, the 1999 service instruction SI-912-001 "INSTALLATION OF ROTARY WATER PUMP SEAL / PUMP IMPELLER" has a section about tolerated leakage quoted below, is this test applicable to my engine? I understand the water pump design changed at some point.
From SI-912-001:
"For this check the engine must be operated until all temperatures have stabilized for a period of 5 minutes. At that point shut down engine and ensure the ignition is switched off and engine secured against unintentional operation.
Coolant must not drip through leakage bore, located at the base of the igniton housing, for a period of 1 minute after the engine has been stopped.
In case this leakage test can not be passed, the rotary seal must be renewed."
Thanks!
Dan Harrington
Engine Serial Number: 6785083
Engine Type: ROTAX 912 ULS
Engine Version: 912 ULS2-01
Model Number: 309120110
Production Date: 08-Oct-2015
