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| Cylinder Head Thermostat bypass fitting https://ausmini.com/forums/viewtopic.php?f=2&t=94386 |
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| Author: | GundyGuy [ Sun Dec 11, 2016 10:52 am ] |
| Post subject: | Cylinder Head Thermostat bypass fitting |
Can someone tell me what the thread is in the head for this bypass fitting The one the connects to the water pump I have a new fitting here that is 5/8" x 16 tpi and i can not find any reference to this thread can someone confirm that this is the thread |
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| Author: | Tim I [ Sun Dec 11, 2016 11:24 am ] |
| Post subject: | Re: Cylinder Head Thermostat bypass fitting |
Yes, it is an odd-ball. It is also used for the crankshaft bolt. It is 5/8-16 Whitworth apparently, but I reckon a 5/8-16 UNS will be close enough even though the threadform is slightly different (55 deg v's 60 deg) given the low torque/load on the fitting. I am about to change that fitting myself.... once my new tap arrives from China 
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| Author: | drmini in aust [ Sun Dec 11, 2016 11:45 am ] |
| Post subject: | Re: Cylinder Head Thermostat bypass fitting |
I drill the remains 9/16" then run a 5/8 18 UNF tap in, it takes hardly anything out (except the old fitting's thread). There are only about 3 or 4 threads in there! I make new fittings from 5/8 UNF [RH] oxy hose joining nipples. Just turn one end down and shorten the other end a bit. Never rust, last forever. |
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| Author: | GundyGuy [ Sun Dec 11, 2016 12:43 pm ] |
| Post subject: | Re: Cylinder Head Thermostat bypass fitting |
Well with the use of a thread file and a die grinder i managed to revive the thread and get the fitting installed Only problem is that the fitting was just plain round and no hex So a little butchery to get it screwed in |
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| Author: | Phil 850 [ Sun Dec 11, 2016 7:34 pm ] |
| Post subject: | Re: Cylinder Head Thermostat bypass fitting |
GundyGuy wrote: Well with the use of a thread file and a die grinder i managed to revive the thread and get the fitting installed Only problem is that the fitting was just plain round and no hex So a little butchery to get it screwed in The plain round ones that I have seen have two little notches in the hose end of them so you can fit a big screwdriver in and screw it in tight that way. You could mod yours with a hacksaw. |
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