Pressure testing seawater side of QSB 5.9 - Cummins Marine Forum

This topic has 2 replies, 2 voices, and was last updated 4 years ago by worldcatlemon.

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October 30, 2019 at 11:03 am #80101

worldcatlemon
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Vessel Name: Adjusted Priorities
Engines: QSB 425 Cummins
Location: Pacific Northwest
Country: United States

I am servicing all the seawater components ( fuel cooler, aftercooler, gear cooler and heat exchanger and will pressure test them but don’t know how much pressure to load them with and for how long?

Seems like the reservoir cap is a 15 lb. but not for sure
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October 31, 2019 at 10:13 pm #80199

worldcatlemon
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Vessel Name: Adjusted Priorities
Engines: QSB 425 Cummins
Location: Pacific Northwest
Country: United States

Far out!! Thanks

October 30, 2019 at 2:46 pm #80118

Rob Schepis
Forum Moderator
Vessel Name: Tenacious
Engines: 6BTA 5.9 330's - "Seaboard Style"
Location: Long Island, NY
Country: USA

As you know, the 15psi pressure cap is on the coolant circuit, not the raw water circuit that you’ll be servicing. Something in the range of 25psi for an hour on an decent gauge would be good.
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