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| Thermostat sender hole in head https://www.slantsix.org/forum/viewtopic.php?t=47767 |
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| Author: | mackwagon [ Mon Jan 30, 2012 10:27 am ] |
| Post subject: | Thermostat sender hole in head |
There is a ~3/8" ~fine thread hole in the top of the head on the carb side of the valve cover , in the valve cover flange surface, middle of the head (front to back). Is this a mounting hole for a head temp sensor?? what thread pitch? We got our slant 6 fired up and running and found several water leaks. This small hole was not leaking, but it was bubbling and steaming a bit. it looked like more steam that one would have if we were just boiling off a little water in the hole, meaning it seem to bubble and steam like it was a small crack into the water jacket?? I'm assuming we could just run a bolt in to seal it off, or install a temp sensor or ??? |
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| Author: | Doc [ Mon Jan 30, 2012 10:46 am ] |
| Post subject: | |
Are you looking at the 2 raised bosses, just outside of the valve cover? (one near the center and other one toward the rear of the engine) These threaded holes / mounting points are used to lift the engine / trans assembly, for installation into the vehicle. They are 3/8-16 unc threads DD 
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| Author: | mackwagon [ Mon Jan 30, 2012 11:20 am ] |
| Post subject: | Holes |
Yeah, I think that center one is the one I was referring too. OK, its just the lifting hole. So we can bolt that closed and put a little sealant on it for now. Thanks very much for the picture and the help. |
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| Author: | 75customdart [ Mon Jan 30, 2012 11:53 am ] |
| Post subject: | third hole |
There is a third hole on some heads. Back two are mounting points like doc mentioned third is for temp sensor.  [/img] |
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| Author: | DusterIdiot [ Mon Jan 30, 2012 6:41 pm ] |
| Post subject: | Lol... |
Quote: There is a third hole on some heads.
There can be a couple others in that location if you have a 1981+ head...-D.Idiot |
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| Author: | Reed [ Mon Jan 30, 2012 7:43 pm ] |
| Post subject: | |
The two middle holes shouldn't need anything put in them. They don't go into the water jacket. If you have coolant coming out of the middle holes then you have a problem. |
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