Thread: Hurricane Leak
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Old 12-09-2019
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Randy Dupree Randy Dupree is offline
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Join Date: Dec 2007
Location: Port St Joe,Fl
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Originally Posted by NoGas View Post
Have been trying to figure out why the Engine Pre-Heat pump housing which was replaced only 3-1/2 years ago cracked. Further investigation revealed a residual coating of glossy/hard white substance on the nipple threads on the engine preheat pump connection fitting which exits the H case. I will need to remove this substance before the threads will work with the newly repaired pump. Since the engine coolant water in this line continuously flows at 180°F or higher, could it be that either the threads of the plastic pump or something inside the pump melted and/or caused it to leak? The housing crack appears to go all the way through the housing at the connection point. However, based on the temperature characteristics of the materials used for the pump and impeller, I have also ordered a new impeller for my pump. Once fixed, should this issue crop up again I will follow Lance’s example but also internally bypass this pump (that I don’t use it anyway )

Notes: On checking the pump description, I discovered the pump body is made of Noryl Plastic and the impeller of Nylon. From the plastic manufacturer, Noryl has a Max Service Temperature of 163-189 °F and a Melting Temperature of 351-432 °F, while Nylon 6 typically exhibits a glass transition temperature of 48°C (118.4°F) and a melt temperature of 214°C (412°F).

Sounds like you need a water cooled pump!
email me at only.

Randy Dupree
2000 LXI 43
Port St Joe Fl.
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