Thread locker/sealant for oil drain extension

[Burt Shaver]

Good morning, I’m converting my mother in laws John Deere S120 riding mower from the easy change oil filter $111.69 so that it can use a regular oil filter and maintenance kit lg276 for $44.71. What thread locker or sealant should I be using for the oil drain extension tube? It’s a metal tube that screws in where the oil drain plug goes, it’s metal. From what I’ve found so far I’m seeing loctite 567 online

 

[BrandonV]

I'd use Permatex High Temperature Thread Sealant.

 

[Burt Shaver]

I'd use Permatex High Temperature Thread Sealant.

I’ve seen one post that recommends Permatex thread sealant with PTFE. I may get some of this. I’ve also seen a few people on other old threads say Permatex Aviation form a gasket, I only mention it because I already have the aviation form a gasket?

 

[CraigStu]

I am wondering is this a pipe thread or straight thread w/ a seal washer. If it's pipe thread any of the above will work, if not a new washer would be best.

 

[BrandonV]

These are different types of applications. Permatex High Temperature Thread Sealant is a thread locker with sealing properties, ideal for situations where the assembly is not meant to be taken apart. In contrast, the aviation sealant is better suited for components that will be disassembled and reassembled, as it primarily serves as a sealant rather than a thread locker.

 

[Burt Shaver]

I am wondering is this a pipe thread or straight thread w/ a seal washer. If it's pipe thread any of the above will work, if not a new washer would be best.

I am wondering is this a pipe thread or straight thread w/ a seal washer. If it's pipe thread any of the above will work, if not a new washer would be best.

I’m not sure exactly the difference between a pipe thread and a straight thread? I’m guessing this is a pipe thread with no seal or washer

 

[CraigStu]

Yep, I agree it's pipe thread so any of the above.

 

[DGersic]

I’m not sure exactly the difference between a pipe thread and a straight thread? I’m guessing this is a pipe thread with no seal or washer

Pipe thread is a tapered fit, so you’re compressing the pipe in to the fitting as you tighten it.

Straight thread is like on a bolt. There is no compression or sealing provided by the thread, it relies on some other mechanism to seal the connection.

That looks like pipe thread to me. Examine it closely, you should be able to see the taper.

 

[Burt Shaver]

I’m learning, I was going to use an electronic caliper to measure the thread diameter at each end but the photo shows that the pipe thread is in fact tapered. My thoughts, correct me if I’m wrong is to use Permatex high temp thread sealant either 59206, 59214 or 59234 which all seem to be identical, all are sealants as well as thread lockers that don’t require any special measures like high heat to break free if the need ever arises. I do have the aviation form a gasket but it has no thread locking action. I will also need to install the piece in the 3rd picture to convert it from the easy change filter to a regular Deere filter. I’m thinking it’s a good idea to use the high heat thread sealant I mentioned above to avoid the possibility of either thread turning out while changing the filter or turning the end in the oil drain extension as it takes a bit of torque to turn.

 

[Rusted Nut]

Is the extension going into an oil pan or similar? If so, oil pan thread boss are usually too shallow for tapered pipe threads, just not sufficient threads on the boss to seal. Permatex high temp works well.

 

[Burt Shaver]

Is the extension going into an oil pan or similar? If so, oil pan thread boss are usually too shallow for tapered pipe threads, just not sufficient threads on the boss to seal. Permatex high temp works well.

The extension is going into the engine block of a John Deere S120 riding mower. The rain plug is removed and this extension put on

 

[cosmokenney]

This extension is outside the engine then? I would want a sealant that is permanent and that hardens so that when you take the cap off the extension it does not turn the extension. I think the 567 works for this case. It hardens to a solid.
Loctite 592, on the other hand won't harden -- it is what I use on diff plugs and so on.

 

[scooby074]

Id use 567.

 

[BlakeTheCarGuy]

I’d use Permatex Seal & Lock. It’s PTFE & thread locker mixed so it seals threads but also keeps them from moving too. I use that now on all fittings instead of just regular teflon tape.

 

[Burt Shaver]

https://www.permatex.com/wp-content/uploads/tds/59214.pdf

The 592 seems like it should work as well, going to give it a try. Thanks for all the replies

 

[Burt Shaver]

I’d use Permatex Seal & Lock. It’s PTFE & thread locker mixed so it seals threads but also keeps them from moving too. I use that now on all fittings instead of just regular teflon tape.

Although the seal and lock would be better after reading the spec sheets. I’ve already bought the 592 but I may order the seal and lock

 

[BrandonV]

Although the seal and lock would be better after reading the spec sheets. I’ve already bought the 592 but I may order the seal and lock

I'm looking at them from a specification sheet perspective and I think they're more in common than different. Should be fine either way.

 

[Sumboodie]

I’d use Permatex Seal & Lock. It’s PTFE & thread locker mixed so it seals threads but also keeps them from moving too. I use that now on all fittings instead of just regular teflon tape.

Just need to heat to get apart?

I've been using Tru Blu but it doesn't really set. It's a game of is it tight enough or can I go another turn on elbows.

 

[BlakeTheCarGuy]

Just need to heat to get apart?

I've been using Tru Blu but it doesn't really set. It's a game of is it tight enough or can I go another turn on elbows.

No heat as it’s the equivalent to blue thread locker and not red.

 

[Sumboodie]

No heat as it’s the equivalent to blue thread locker and not red.

Claims only for 1000psi, wonder if that's correct.
Most systems I'm dealing with are around 3000 psi.

Tru Blu is 10,000.