Home > Maintenance & Modifications > Defender M57 engine cooling issue |
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Doby92 Member Since: 01 Jan 2025 Location: Mackay Posts: 4 |
what is the bypass waterway, the Thermostat only has a simple spring loaded valve, either open or closed, no other valve in it.
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3rd Jan 2025 8:53am |
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Les Brock Member Since: 20 Mar 2012 Location: Stroud, Glos Posts: 153 |
James,
Hows the stat modified or just a lower temp stat (part number) ? I thought I read the Davies EWP pumps could be run pass through in the bottom hose (with 2x3mm holes drilled in stat to stop it dead heading) with belt pump left in situ not heard/thought of fitting pump in top hose before TBH - but if it works ..... I have a EWP150 sat here trying to decide where it should go ... Cheers |
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3rd Jan 2025 10:21am |
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andy63 Member Since: 30 Jun 2023 Location: north east Posts: 553 |
All stats work on that principle .. When cold the water is just looped back to the pump from the engine.. When the water is hot enough the stat starts to open and allow some flow to the radiator from engine before returning to the pump..if it keeps getting hotter the stat will fully open and close the normal flow from the engine to pump off and all the coolant will pass through the radiator before returning to the pump.. That's what is been referred to by bypass I think..if you simply remove the stat the water from the engine has two paths available. Directly back to pump and back to pump via radiator.. In a properly functioning and designed system once the stat is fully opened and all coolant is diverted through the radiator that should maintain the engine temp within a few degrees of the max stat rating..they usually have a opening temp and a fully open temp.. So really by removing a stat all you should really be doing is causing the engine to take longer to reach its max temp if its been worked hard and causing it to run cool when not been worked.. or that's how I see it..🤔 |
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3rd Jan 2025 10:57am |
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jst Member Since: 14 Jan 2008 Location: Taunton Posts: 8088 |
Yep, correct. So block route from head to pump that bypasses the rad to make sure it all goes through the rad. As andy not needed on a properly balanced system, which the m57 in a def isint and the stats are of questionable quality.
Ewp top hose switched to come on when there is flow in top. Modified mahle stat in my cases. Cheers James 110 2012 XS Utility 130 2011 M57 bespoke Camper 90 2010 Hardtop 90 M57 1988 Hardtop |
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3rd Jan 2025 3:25pm |
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jst Member Since: 14 Jan 2008 Location: Taunton Posts: 8088 |
Yep, correct. So block route from head to pump that bypasses the rad to make sure it all goes through the rad. As andy not needed on a properly balanced system, which the m57 in a def isint and the stats are of questionable quality.
Ewp top hose switched to come on when there is flow in top. Modified mahle stat in my cases. Cheers James 110 2012 XS Utility 130 2011 M57 bespoke Camper 90 2010 Hardtop 90 M57 1988 Hardtop |
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3rd Jan 2025 3:26pm |
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tommobot Member Since: 15 May 2018 Location: Stratford Upon Avon Posts: 27 |
Sorry for the endless questions but would you be able to provide a photo of the EWP in top hose... I'm struggling to visualize how I'd fit one in the top hose as the Craig Davies pumps seem fairly adamant in their installation orientation...
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3rd Jan 2025 9:02pm |
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tommobot Member Since: 15 May 2018 Location: Stratford Upon Avon Posts: 27 |
Sorry for the endless questions but would you be able to provide a photo of the EWP in top hose... I'm struggling to visualize how I'd fit one in the top hose as the Craig Davies pumps seem fairly adamant in their installation orientation...
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3rd Jan 2025 9:02pm |
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jst Member Since: 14 Jan 2008 Location: Taunton Posts: 8088 |
Just fit so outlet at top for air to exit. Cheers James 110 2012 XS Utility 130 2011 M57 bespoke Camper 90 2010 Hardtop 90 M57 1988 Hardtop |
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3rd Jan 2025 9:43pm |
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