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Old 29-07-17, 06:53 AM   #1
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Default Petter S type 18-21HP air start

I have a Petter "S" type 18-21 HP diesel which I hand crank to start (yes, very difficult even with two on the handle). I see in the reprint Pettter catalogue from that era that one could option a manual air start valve. I figure I could design and build that myself but would like to know if anyone has such a valve or at least pictures/drawings so I don't have to re-invent the wheel. Andy Moran, Australia
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Old 29-07-17, 08:14 AM   #2
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The original drawings will be in the Petter archive at

A simple quarter turn ball valve will do the job, though you will need 200psi+ which is beyond most workshop compressors.

It's sounds like the compression is low, it should start on a bounce.


Last edited by danthetangye; 29-07-17 at 08:19 AM. Reason: Pressure info
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Old 29-07-17, 11:37 AM   #3
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The 18/21hp spares list shows the air start components, I can scan those pages if you can't source the information from Internal Fire.

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Old 30-07-17, 08:30 AM   #4
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Thanks for that fellas, I'll download the Museum of Fire stuff - I'm off to the bush tomorrow so a job for later in the week. I have a Petter Atomic, 50 HP twin which starts dead easy on air (Petter Reavel compressor) so the air isn't a problem. The S Type has a gigantic single flywheel (the set up is 2.4 ton) so bounce is out of the question. My McDonald T Type (9.25 in bore) starts very easily on the bounce but with next birthday my 70th I'm looking for the easy way.
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