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GEN 2 (2017-2020) Ford F-150 Raptor Forums
Ford Raptor Engine Discussion and Performance Mods
Thermostat thread
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<blockquote data-quote="RobertH6657" data-source="post: 1342009" data-attributes="member: 24604"><p>The stat works fine, just getting it on is painful. It only compresses about 2-3mm but it's pushing up against the bypass which according to Reische is fine. I went to MPT and they verified that everyone is experiencing the difficulty of installation issue. Here's why it is in fact an issue. Your stock stat is 61mm in height (it is clearly stamped on he stat). These three aftermarket 170F stats are also clearly stamped with 64mm. The 61mm stock unit is designed so that it will sit in place during reassembly (which makes sense) and it just barely touches the back of plastic water housing against the bypass. If there was any more clearance, the bypass would not work correctly during engine warmups. The extra 3mm DOES hit the back of the housing leaving 3mm of the stat sticking out and it doesn't sit in place. If you try to push it in place (there is a groove cut in the water housing to hold the stat in place while reassembling) the spring on the brass side of the stat pushes it out during reassembly. The main valve spring that opens the stat for radiator fluid to flow is NOT the spring under compression during reassembly. It is the opposite side. The brass side. I called Reische and they told me that the little bit of compression is OK as they want to stat to sit firmly against the bypass. They said that it will not hurt a thing. It's just painful to install.</p></blockquote><p></p>
[QUOTE="RobertH6657, post: 1342009, member: 24604"] The stat works fine, just getting it on is painful. It only compresses about 2-3mm but it's pushing up against the bypass which according to Reische is fine. I went to MPT and they verified that everyone is experiencing the difficulty of installation issue. Here's why it is in fact an issue. Your stock stat is 61mm in height (it is clearly stamped on he stat). These three aftermarket 170F stats are also clearly stamped with 64mm. The 61mm stock unit is designed so that it will sit in place during reassembly (which makes sense) and it just barely touches the back of plastic water housing against the bypass. If there was any more clearance, the bypass would not work correctly during engine warmups. The extra 3mm DOES hit the back of the housing leaving 3mm of the stat sticking out and it doesn't sit in place. If you try to push it in place (there is a groove cut in the water housing to hold the stat in place while reassembling) the spring on the brass side of the stat pushes it out during reassembly. The main valve spring that opens the stat for radiator fluid to flow is NOT the spring under compression during reassembly. It is the opposite side. The brass side. I called Reische and they told me that the little bit of compression is OK as they want to stat to sit firmly against the bypass. They said that it will not hurt a thing. It's just painful to install. [/QUOTE]
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