Strokermjcomanche Posted August 6, 2015 Share Posted August 6, 2015 I have a newer 4.0 with the 0630 head that is not drilled for the coolant temp sender in the back of the head and need to relocate the sender to the thermostat housing . From what I've found out so far is the sender is 1/8 x27 thread and the hole in the thermostat housing is 3/8 pipe thread .The 1/8 X27 has proven to be the difficult thread to find . I need an adapter to mate the two together unless it would not read correctly because not enough of the sensor is in the coolant . I seen where Cruiser said to relocate to the thermostat but I'm open to other ideas and would rather not try my luck at drilling / tapping the head . Thanks in advance . Btw it's an 88 renix 4.0 that I'm working on . Link to comment Share on other sites More sharing options...
cruiser54 Posted August 6, 2015 Share Posted August 6, 2015 That's pipe thread, also known as NPT. You need a bushing from 3/8 NPT to 1/8 NPT. Common as belly buttons. Link to comment Share on other sites More sharing options...
Strokermjcomanche Posted August 6, 2015 Author Share Posted August 6, 2015 That's pipe thread, also known as NPT. You need a bushing from 3/8 NPT to 1/8 NPT. Common as belly buttons. Thanks Cruiser none of the local parts stores have the bushing and there are no Napa's close so it looks like I'll have to order one . Thanks again Link to comment Share on other sites More sharing options...
cruiser54 Posted August 6, 2015 Share Posted August 6, 2015 Plumbing/hardware store. Link to comment Share on other sites More sharing options...
docivy Posted August 6, 2015 Share Posted August 6, 2015 Yep I work part time at the home depot and we most certainly have them Link to comment Share on other sites More sharing options...
Eagle Posted August 6, 2015 Share Posted August 6, 2015 That's pipe thread, also known as NPT. You need a bushing from 3/8 NPT to 1/8 NPT. Common as belly buttons. Thanks Cruiser none of the local parts stores have the bushing and there are no Napa's close so it looks like I'll have to order one . Thanks again As Cruiser wrote, go to a plumbing supply house. Pipe threads are NOT machine screw threads. Pipe threads are slightly tapered, so that as the male piece is threaded into the female hole the fit get's tighter. Whatever you do, don't try to use machine screw parts (or taps or dies) where you need pipe threads. Link to comment Share on other sites More sharing options...
teamsmith Posted August 6, 2015 Share Posted August 6, 2015 i got mine at ACE Hardware. I had to lengthen the wire by about a foot. Link to comment Share on other sites More sharing options...
HOrnbrod Posted August 6, 2015 Share Posted August 6, 2015 There are quite a few reports on the stroker forums of guys using the 0630 head w/o the temp sensor hole and using the bushed down thermostat housing hole instead. It almost never works because the sensor element is not immersed enough to provide accurate temp readings. I'd drill and tap a 1/8 NPT hole on the head boss if it were me. Link to comment Share on other sites More sharing options...
tugalo Posted August 6, 2015 Share Posted August 6, 2015 Not to hijack a thread, but your rreply brings up a question Don. I have an 88 with the gauge temp sensor in the rear of the head and i have moved the computer temp sensor to the thermostat housing. Is it possible that my poor gas mileage is partially due to a low reading from the thermo sensor? Link to comment Share on other sites More sharing options...
relyt120 Posted August 6, 2015 Share Posted August 6, 2015 Not to hijack a thread, but your rreply brings up a question Don. I have an 88 with the gauge temp sensor in the rear of the head and i have moved the computer temp sensor to the thermostat housing. Is it possible that my poor gas mileage is partially due to a low reading from the thermo sensor? The sensor this thread focuses on is only for the temp gauge, IIRC Link to comment Share on other sites More sharing options...
HOrnbrod Posted August 6, 2015 Share Posted August 6, 2015 Not to hijack a thread, but your rreply brings up a question Don. I have an 88 with the gauge temp sensor in the rear of the head and i have moved the computer temp sensor to the thermostat housing. Is it possible that my poor gas mileage is partially due to a low reading from the thermo sensor? In standard configuration, the Renix system ECU temp signals come from the temp sensor on the left lower side of the block under the exhaust manifold. If you have moved that to the stat housing, theoretically it will be sensing cooler coolant temperatures and could possibly affect mileage as it will run richer. For the HO's, the ECU temp signals come from the sensor in the stat housing. Link to comment Share on other sites More sharing options...
Strokermjcomanche Posted August 6, 2015 Author Share Posted August 6, 2015 Well here's what I've come up with today and I mean ALL day of running around . I found this bushing and the sensor won't even go in because the bottom of the sensor hits the tapered threads ... Then I found this one where it threads in but doesn't look like it will give an accurate reading .. Link to comment Share on other sites More sharing options...
Strokermjcomanche Posted August 6, 2015 Author Share Posted August 6, 2015 So I then thought maybe this will work ? I have extras to try other options too , if not it looks like I'll be drilling and tapping the head . Link to comment Share on other sites More sharing options...
HOrnbrod Posted August 6, 2015 Share Posted August 6, 2015 I think that will work since it's only for the coolant temp gauge, si? If it's not indicating correctly you can always plug it with a 1/8" NPT plug. BTW, 1/8" x 27 as in your first post thread is 1/8 NPT. Link to comment Share on other sites More sharing options...
Strokermjcomanche Posted August 6, 2015 Author Share Posted August 6, 2015 I think that will work since it's only for the coolant temp gauge, si? If it's not indicating correctly you can always plug it with a 1/8" NPT plug. BTW, 1/8" x 27 as in your first post thread is 1/8 NPT. It will be a week or two until I have the engine running to make sure it won't leak . Thanks for all the replies/ help . Link to comment Share on other sites More sharing options...
docivy Posted August 7, 2015 Share Posted August 7, 2015 http://m.summitracing.com/parts/mio-mmwhs-38-bk This seems easier and honestly allot less headache than taping the head Link to comment Share on other sites More sharing options...
cruiser54 Posted August 7, 2015 Share Posted August 7, 2015 I think that will work since it's only for the coolant temp gauge, si? If it's not indicating correctly you can always plug it with a 1/8" NPT plug. BTW, 1/8" x 27 as in your first post thread is 1/8 NPT. It will be a week or two until I have the engine running to make sure it won't leak . Thanks for all the replies/ help . That would be fine as would be shortening the bushing so the sender projected out past the end of it. Either way. Pipe threads naturally seal as they are tapered. I wish I had my son in law's Jeep here....... Link to comment Share on other sites More sharing options...
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