Excellent idea Doc, then you won't have to replace it every 25 years.
Can't you just blank them ala Rover style? Don't shoot me, just asking.
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| Tap size? https://www.ausmini.com/forums/viewtopic.php?f=2&t=86163 |
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| Author: | Simo [ Fri Jun 20, 2014 8:09 pm ] |
| Post subject: | Tap size? |
Hello all, I'm in the process of getting the mini on the road and I've hit a bit of a snag. A small one but a snag no the less. After I removed what was left of the coolant bypass pipe that sits in the cylinder head, i've found that the new pipe won't go in. I've had a look at the thread and it looks undamaged, just covered in crud and needs a thread tap put through it. Could someone tell me what sized tap I need please? Cheers Simo |
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| Author: | kiwiinwgtn [ Fri Jun 20, 2014 8:50 pm ] |
| Post subject: | Re: Tap size? |
If I recall it's a 5/8 16TPI and is a special tap, same as the end of the crank shaft. |
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| Author: | kiwiinwgtn [ Fri Jun 20, 2014 9:13 pm ] |
| Post subject: | Re: Tap size? |
Just checked it is 5/8 16n I would use a small wire brush in a drill, or a pick Way cheaper than the correct tap as they are exspensive. |
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| Author: | drmini in aust [ Fri Jun 20, 2014 10:01 pm ] |
| Post subject: | Re: Tap size? |
I put a 5/8-18 UNF tap in there (it's only got about 4 threads), then machine up a brass fitting. No more rusting... |
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| Author: | peterb [ Sat Jun 21, 2014 7:34 am ] |
| Post subject: | Re: Tap size? |
Excellent idea Doc, then you won't have to replace it every 25 years. Can't you just blank them ala Rover style? Don't shoot me, just asking. |
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| Author: | drmini in aust [ Sat Jun 21, 2014 8:05 am ] |
| Post subject: | Re: Tap size? |
Haha. Every head I buy/acquire seems to be 40 years old, nothing much left there to unscrew so I stick a 9/16" drill in it then peel the threads out with the tap. I object to paying $10 or more for new adaptors with built in rust capability, so I make brass ones. Sure you can plug it, I'd drill one or two 3mm holes in the thermostat to provide a little circulation during warmup. The Rover heads are plugged but have a sandwich plate under the thermostat instead. I don't know how that is plumbed in the system- there ain't no Rover Minis around here. |
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| Author: | peterb [ Sat Jun 21, 2014 8:23 am ] |
| Post subject: | Re: Tap size? |
Yeah, I think it's still by passes through the manifold heating section. Rover's have the most hiddius hose arrangement. |
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