Temp Sender Thread

[cjc_td5]

When I removed the mechanical temperature gauge sender unit in the thermostat housing some months ago it provided quite a bit of resistance and ended up piercing the bulb and damaging the thread in the aluminium housing. There is not enough thread to hold the new sender unit.

What are my options?
Would a helicoil work in this situation? (I have not used one before)
Try to build up some metal in the thread area (with solder or similar) and recut a new thread?
Can new (or good second hand) thermostat housings be obtained?

Your thoughts?
Cheers,
Chris

[Grockle]

I'd helicoil it Chris,good luck

[chazza]

Helicoil might work if the proper thread is available for the sender; so would boring it larger and tapping to a bigger size and using a reducer,

Cheers Charlie

[Bigbjorn]

Helicoil might work if the proper thread is available for the sender; so would boring it larger and tapping to a bigger size and using a reducer,

Cheers Charlie

Another alternative. Build up with Devcon metal putty, drill and retap to original size.

[groucho]

I think from memory the thread is 1/2 inch BSP ?
Dunno if you can get BSP helicoils
May be tap it to the next size as chazza sez and use a reducer
Some plumding shops will have the fittings still quite common...Mark

[groucho]

You may have problems removing the housing. Those alloy housing's
become a problen with the bolts rusting. I have had to cut a few off with an grinder as there was no way the bolts would come loose.
Better to tap it to the next size in situ............
I have at least 5 that look like these.
going by the age if these things you may get a surprise..........







https://www.aulro.com/afvb/images/imported/2010/01/903.jpg

[groucho]

Country water......... Good luck...........




https://www.aulro.com/afvb/images/imported/2010/01/902.jpg

[Blknight.aus]

you can ally putty it
araldite will also work if you descale the housing first.

I would try getting it machined to take a larger fitting and fitting a reducer helicoil style but different.

generic helicoils are NOT rated for sealing, mostly they work sometimes they dont. generous servings of loctite 243 or 567 whilst assembling will work just dont sell it on to me afterwards or ask me to get the heicoil out again.

[chris1983rangie]

hi,

never heard about Helicoils, did some reading to add to my brain. Goto say what a clever invention!
also found a good vid demonstration on youtube

YouTube- How to Repair Threads With A Heli-Coil Insert

cheers

Chris;)

[cjc_td5]

you can ally putty it
araldite will also work if you descale the housing first.

I would try getting it machined to take a larger fitting and fitting a reducer helicoil style but different.

generic helicoils are NOT rated for sealing, mostly they work sometimes they dont. generous servings of loctite 243 or 567 whilst assembling will work just dont sell it on to me afterwards or ask me to get the heicoil out again.

Araldite, there's an interesting option, especially as I have some sitting on the shelf. If it doesn't work I can just drill it out and tap to a larger size and fit a reducer as also suggested.

I am trying to avoid having to remove the housing from the block as I think this will be a pig of a job and will lead to other issues (i.e. busting it). I have not reinstalled the wings and radiator yet so have pretty good access.

Now I have to try and locate some BSP plug taps, especially the full plug tap to cut a thread right down to the shoulder that the sender seats onto.

Cheers,

[groucho]

Araldite, there's an interesting option, especially as I have some sitting on the shelf. If it doesn't work I can just drill it out and tap to a larger size and fit a reducer as also suggested.

I am trying to avoid having to remove the housing from the block as I think this will be a pig of a job and will lead to other issues (i.e. busting it). I have not reinstalled the wings and radiator yet so have pretty good access.

Now I have to try and locate some BSP plug taps, especially the full plug tap to cut a thread right down to the shoulder that the sender seats onto.

Cheers,

Some BSP and GAS threads are the same 14 TPI.......
Seeing where you live there must be lots of that stuff still around.......

[Bigbjorn]

Some BSP and GAS threads are the same 14 TPI.......
Seeing where you live there must be lots of that stuff still around.......

Some people called pipe threads Gas but officially there is no such thing. Town gas plumbing in Oz always used BSP threads. Pre WWII a lot of USA tap and die makers called BSP tools Whitworth and one occasionally still encounters old US made pipe threading tools marked "W". This is because at that time this was the only Whitworth form thread used in the USA.

You have in common use in Australia BSPT, BSPP, NPS, NPT, NPT Dryseal, and a few other variants of NP. Metric Conduit threads are often encountered. Easy to recognise as they are all 1.5mm pitch.

BSPT & BSPP are accepted as an ISO system and called ISO R and ISO G.

[groucho]

Some people called pipe threads Gas but officially there is no such thing. Town gas plumbing in Oz always used BSP threads. Pre WWII a lot of USA tap and die makers called BSP tools Whitworth and one occasionally still encounters old US made pipe threading tools marked "W". This is because at that time this was the only Whitworth form thread used in the USA.

You have in common use in Australia BSPT, BSPP, NPS, NPT, NPT Dryseal, and a few other variants of NP. Metric Conduit threads are often encountered. Easy to recognise as they are all 1.5mm pitch.

BSPT & BSPP are accepted as an ISO system and called ISO R and ISO G.

unofficially i have a full set markde GAS









https://www.aulro.com/afvb/images/imported/2010/01/808.jpg

[Bigbjorn]

LAL brand and very old, probably pre WWII. Lanham, Archer, and Lane.I don't think they still exist.

The British Standard was BS Pipe, and the term gas was never used in a standard.

I can't read the size on that tap but 14tpi makes it either 1/2", 5/8", 3/4", or 7/8". 5/8" and 7/8" are BSPP only, not BSPT.

[groucho]

LAL brand and very old, probably pre WWII. Lanham, Archer, and Lane.I don't think they still exist.

The British Standard was BS Pipe, and the term gas was never used in a standard.

I can't read the size on that tap but 14tpi makes it either 1/2", 5/8", 3/4", or 7/8". %/8" and 7/8" are BSPP only, not BSPT.

They were my Grandfathers down to Dad and on to me.

Got two large lockers with all the good English stuff.
There is a lot of things that i still don't know what they were used for.....

[cjc_td5]

Some BSP and GAS threads are the same 14 TPI.......
Seeing where you live there must be lots of that stuff still around.......

Might have a sniff around for some BSP taps at the Bathurst swap meet at the end of this month.

Chris