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Outlander 400 coolant pressure


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#1 Thorgod72

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Posted 17 October 2020 - 03:17 PM

About a month ago 2005 400 the crank went had a lot of miles on her so not complaining. I rebuilt her she ran great for a week the blur head gasket. Checked way too much coolant pressure. Put new cylinder and head on all new gaskets pressure tested it runs great but coolant pressure is high again I’m stumped


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#2 stovepiper

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Posted 18 October 2020 - 10:12 AM

coolant or oil pressure?



#3 Thorgod72

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Posted 18 October 2020 - 02:13 PM

Coolant. I took my thermostat out bike was running too hot that might have been my problem I have two 400 so I compared temps at heads, took thermostat out now there running same temp.


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#4 25TH INFANTRY

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Posted 23 October 2020 - 03:53 PM

The Early G1 machines [2006-2008] had issues with the rad cap not having the pressure relief hole cut out in the cap, causing the bike to build pressure and over heat, also causing the radiator to swell. i would check that cap. what year machine



#5 GYPSY400

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Posted 23 October 2020 - 06:21 PM

Rad cap controls pressure.. once the coolant pressure rises Above the cap setting, coolant flows into the overflow.. once things cool down the coolant siphon back into the rad. So first check the rad cap with a pressure tester, and check the cap on the overflow that it has a pin hole vent ( also check the white cap under it)

Next, is this machine actually boiling the coolant from overheating? If that's the case, check the rad for being plugged with mud... EVERY square inch of the rad needs to be clean!!!! After that, check to make sure the water pump is actually circulating the coolant. Also check that the fan is working.. might be a blown fuse.


The 400 did not have the rad swelling issue that the v twins had

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GYPSY400

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www.outlander400.piczo.com
quite possibly the O-400 Guru??

#6 7shortmag

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Posted 04 November 2020 - 07:58 AM

About a month ago 2005 400 the crank went had a lot of miles on her so not complaining. I rebuilt her she ran great for a week the blur head gasket. Checked way too much coolant pressure. Put new cylinder and head on all new gaskets pressure tested it runs great but coolant pressure is high again I’m stumped
 

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