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912 Coolant Pressure Test

in General Tech Discussion 8 months ago

Question:

Jim Leon asks: Does anyone know where to purchase a radiator pressure tester that will fit a Rotax radiator? I have 3 kits and not one will fit. Thanks

Answer:

Hi Jim,

The kit we use includes a universal rubber adapter that expands as it's tightened to securely seal against the coolant expansion tank. However, we had to trim the rubber slightly so it would fit properly inside the tank and ensure a secure seal.

The specific kit we purchased is the STANT ST270 (12770) Cooling System Pressure Tester Kit, which includes the rubber adapter mentioned. Please see the attached photos of the kit and adapter for reference.

That said, according to the Rotax Line Maintenance Manual (LMM), the correct procedure for pressure testing the coolant system is not performed through the expansion tank. Instead, the pressure test should be conducted through the coolant hose at the upper outlet elbow on the cylinder head (see attached excerpt from the LMM).

The specified limits for the coolant system pressure test are as follows:

Minimum relief pressure: 1.2 bar (17.4 psi)

Maximum relief pressure: 1.6 bar (23.2 psi)

 

Here are a few helpful forum discussions that provide additional information related to the coolant system:

 

 

 

 Let us know if you have any questions!

 

 

10913_1_Maintenance Manual Line for Engine Type 912 Series Edition 4 Revision 1 15.pdf (You do not have access to download this file.)
10913_1_20250423_110733.jpg (You do not have access to download this file.)
10913_1_20250423_110647.jpg (You do not have access to download this file.)

  • Re: 912 Coolant Pressure Test

    by » 8 months ago

    Hi RO,

    With the exception of a mystery coolant leak, under what circumstances might you want to pressure test your cooling system?😈

      
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  • Re: 912 Coolant Pressure Test

    by » 8 months ago

    As stated in the Line Maintenance Manual (LMM) under "Checking of the Cooling System / Radiator Cap":

     

    You should pressure test the cooling system if you observe:

    • Unusual coolant leakage

    • Deposits around the radiator or cooling components

    • An exceeding of the maximum cooling system temperature

     

    These indicators may point to pressure loss, cap malfunction, or leaks, which justify a system pressure test to identify the root cause.

      
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  • Re: 912 Coolant Pressure Test

    by » 8 months ago

    So not a routine test then?😈

      
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  • Re: 912 Coolant Pressure Test

    by » 8 months ago

     Sean

    The Rotax Line Maintenance Manual (LMM) includes several sections related to inspections and maintenance procedures:

    • Chapter 05–00–00 – Maintenance

    • Chapter 05–10–00 – Time Limits

    • Chapter 05–20–00 – Scheduled Maintenance Checks

    • Chapter 05–50–00 – Unscheduled Maintenance Checks

    • Chapter 12–00–00 – Maintenance of the Systems

    • Chapter 12–10–00 – Replenishing Operating Fluids

    • Chapter 12–20–00 – Scheduled Maintenance

    Pressure testing of the coolant system is covered under Chapter 05–50–00 – Unscheduled Maintenance Checks, specifically under "Checking of the Cooling System/Radiator Cap."

     

    Since it’s not listed under the scheduled maintenance checks, it would not be considered a routine test.

    Thank you said by: Sean Griffin
      
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