Coolant leak question TC33D

[sherpa]

I have a coolant leak on my TC33D. I attached a picture so you can identify where the leak is. It is on the right side of the engine just to the right of my oil filter. I need to know if this plug has threads or is pressed into the engine block? It is in line with the freeze plugs. Can this plug be tighten or should I just use some stop leak?
Thanks,
sherpa

 

[MikePA]

Based on its shape, hex, I'd guess it has threads. The picture at Messicks shows threads on it. $32.60.

 

[ruffdog]

It is a common problem. The hose connector is made from zinc and will react with iron. I replaced mine when the tractor was nearly new with brass and it has yet to leak after these years. Pictures will follow very soon.

 

[ruffdog]

Here is what it looks like and the tool to get it out with. I milled a slot into a heavy impact socket to get it out in one piece. You can just cut the bib part off and use a 1-1/16 deep 6 point socket too.

 

[MikePA]

Where can you get the all brass version and what's it called?

 

[ruffdog]

I custom made mine from pipe fitting supplies. These are examples and I believe it is a 3/4 TP thread. Just get the correct hose bib. Use your own judgement on supplies as these are just samples.

Brass & Chrome Pipe Fittings | MSCDirect.com
Brass & Chrome Pipe Fittings | MSCDirect.com
Barbed Hose Fittings | MSCDirect.com

 

[RickB]

IIRC, the block drain on that tractor is 3/4"BSPT, not 3/4"NPT.

 

[ruffdog]

With the 3/4 thread...they are VERY similar. Unlike the other sizes.

NPT vs. BSP Pipe | Pipe and Hose

 

[RickB]

With the 3/4 thread...they are VERY similar. Unlike the other sizes.

NPT vs. BSP Pipe | Pipe and Hose

Maximum one pitch per inch difference for all sizes under 2-1/2". Still different and not a good idea to mix thread pitches.

 

[sherpa]

Thanks so much for this info!
I will order my parts and get them here before I cut the barb off.
sherpa

 

[matt0581]

Hi there everyone, I know this is an older thread however I'm hoping some of you gents are still here.
I just changed the valve with a new New Holland one. The one that was on my tractor looks different, it has a open close valve on it (as did the one I took off). I'm wondering if anyone else has seen one like I was sent?

My problem is that the new one is leaking from the threads. I talked to a buddy that used to be a New Holland mechanic and he told me it's a drain and I should close it unless draining... that doesn't seem right as it appears that this line feeds into the drain open close valve. I want to make sure that if i close it i'm not restricting the flow of coolant.

Open to any ideas anyone has.

 

[HuntingKy]

What did you come up with? I am getting ready to order and replace plug in my TC33D.

 

[blee03]

Just starting to do some research (searching TBN and google) on replacing this fitting with a custom brass setup.
If anyone has any links, helpful info or ideas on piecing one of these together using BSPT threads, I’m all ears!

 

[HuntingKy]

What did you come up with? I am getting ready to order and replace plug in my TC33D.

Replaced the plug a few weeks ago and leak has stopped but still concerned. The plug was eat up pretty badly and the threads in the block were corroded and eat up. The new one didn't want to install and I couldn't even get the old one to screw back in. Spent quite a bit of time with a couple tools working on the threads and finally got the new one started but it only went a couple rounds before really, really tightening up.

 

[blee03]

Replaced the plug a few weeks ago and leak has stopped but still concerned. The plug was eat up pretty badly and the threads in the block were corroded and eat up. The new one didn't want to install and I couldn't even get the old one to screw back in. Spent quite a bit of time with a couple tools working on the threads and finally got the new one started but it only went a couple rounds before really, really tightening up.

Did you just use the OEM replacement part or a custom setup?

 

[HuntingKy]

Did you just use the OEM replacement part or a custom setup?

OEM replacement. Problem was that not only had corrosion eaten away at the old part, it had eaten away at the threads in the block where the leak was.

 

[blee03]

OEM replacement. Problem was that not only had corrosion eaten away at the old part, it had eaten away at the threads in the block where the leak was.

Gotcha
Yeah I’m guessing once I remove the old fitting I’ll find the threads in the block to be corroded as well.
Hopefully not, but we’ll see...

 

[ruffdog]

Way back when my TC33D was near new I replaced the OEM zinc fitting and installed a brass unit I made. Zinc and iron don't get along very well.

 

[blee03]

This is what I ended up using to replace mine, got it from the Amazonians
So far so good but I havent really used the tractor yet since the install
The stock setup leaked while just sitting in the garage and this one hasnt yet, time will tell

 

[rickeyhoward]

bumping this thread hoping for an update as I also have this problem with my 2008 T1520. Thank-you,gentlemen,for all your knowledgeable input on this topic.