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Minimum Cold Start Temperature Recommendation

I've been chasing issues on my Tanis for a year now. Just blew a fuse again. Frustrated doesn't accurately describe my feelings. I'm in Iowa and we are approaching the cold season. With my shop two weeks out to look at the culprit - I would like to know what is the recommended minimum safe temperature for starting to avoid engine damage with cold oil? I run Phillips XC 20W/50. I normally plug in under 40F ambient when system works. Thank you.

Model: Bonanza F33A
Posted 11/28/2023 - 3 months ago
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The Continental Standard Practice Maintenance Manual (M0) requires (their words, not mine) pre-heating if the engine has been exposed to temperatures below 20F for more than 2 hours. Starting between 20-40F, they say to watch the oil pressure and shut down/preheat if you cannot maintain oil pressure below 100psi.

Posted 11/28/2023 - 3 months ago
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What Nicholas said above. For full text and detailed procedure see the M-0 Standard Practice Maintenance Manual for Spark Ignited Engines paragraph 7-4 thru 7-4.1.1.3 (attached below).

Jim
ABS Technical Advisor
BPPP Instructor & Ambassador
CFII/MEI, A&P/I-A

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M-0 Standard Practice Spark Ignited Engines Change 4 June 2023.pdf - 232.3 KB

Posted 11/28/2023 - 3 months ago
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Jim,
Great advice in that document. I just saved that to my Foreflight documents and now I have a "checklist" for cold weather starts and operations. Well done!

Posted 11/29/2023 - 3 months ago
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Minimum Cold Start Temperature Recommendation