TR6 Water pump to manifold adaptor threads BSPT or BSP or ???

[nichola]

Does anyone know what pipe thread the water pump to intake adaptor is where it screws into water pump? Highlighted in the attached picture. Is this BSP or BSPT (it doesn't seem all that tapered to me, unlike NPT).

 

[titanic]

It must be straight or it wouldn't have the sealing washer.
Berry

 

[nichola]

It must be straight or it wouldn't have the sealing washer.
Berry

Yeah, that's right. It actually measures 5/8 inch. Maybe it's just a 5/8 - 14 bolt size.

 

[nichola]

No, maybe I counted those threads wrong but 5/8 would be either 11 or 18 threads per inch. Geez

 

[steveg]

It'll be a BSPP (British Standard Pipe Parallel) thread.

 

[titanic]

It is 5/8"-18. I ran a tap through an extra housing.
Berry

 

[nichola]

It is 5/8"-18. I ran a tap through an extra housing.
Berry

Yeah, the BSP measurements in that table that Steve posted are a little off from what I'm measuring. I was beginning to think it was a 16mm x 1.5 metric. Wish it was because I can find an adapter for that.

 

[steveg]

Moss has it in stock at a reasonable price. Would be nice if it were brass or SS. Running an NPT tapered fitting into the housing wouldn't be a good idea.

Did the TR6 come from the factory with any metric fittings or fasteners?

 

[titanic]

Steve-The only metric fasteners that come to mind are on the calipers of later TR6s. I don't have a catalog handy to quote the details.
Berry

 

[steveg]

Steve-The only metric fasteners that come to mind are on the calipers of later TR6s. I don't have a catalog handy to quote the details.
Berry

Berry - Yeah but they're only partially metric in that (IIRC) the shanks are metric to fit the caliper holes, and the threads are 7/16".

 

[nichola]

In his earlier post, Berry said he threaded a 5/8-18 into the housing. And that seems to coincide with my measuring of the diameter and threads per inch using a caliper. The metric 16x1.5 comes very close and an adapter for that can be found.
5/8 (.625) - 18 tpi
16mm (.629) x 1.5 (16.93 tpi)

This whole discussion stems from my desire to use that heater hose coming out of the water pump as the location for my electric fan thermo-switch, but it needs to be grounded. So, I was going to adapt a tee fitting screwed into the water pump (even though it's aluminum) for the switch instead of mounting it mid-hose. Help me with some lateral thinking, which I tend to suck at. Where else can I reside that switch? Or how else can I ground that switch if it is mid-hose?

 

[titanic]

I think the easiest solution would be to get a fan switch with a ground terminal. Plan B might be to have a bung in the radiator, which could be grounded.
Steve-You may be right about the threads.
Berry

 

[steveg]

In his earlier post, Berry said he threaded a 5/8-18 into the housing. And that seems to coincide with my measuring of the diameter and threads per inch using a caliper. The metric 16x1.5 comes very close and an adapter for that can be found.
5/8 (.625) - 18 tpi
16mm (.629) x 1.5 (16.93 tpi)

This whole discussion stems from my desire to use that heater hose coming out of the water pump as the location for my electric fan thermo-switch, but it needs to be grounded. So, I was going to adapt a tee fitting screwed into the water pump (even though it's aluminum) for the switch instead of mounting it mid-hose. Help me with some lateral thinking, which I tend to suck at. Where else can I reside that switch? Or how else can I ground that switch if it is mid-hose?

I ran this for a while with a Setrab 1/8" NPT 2-wire thermal switch from Pegasus. 2-wire switches don't need a ground. As is shown, it has a ground screw.

The only reason I stopped is my radiator needed fixing so I had them install a bung in the header tank for my switch and a larger bung in the lower tank for a drain tap.

 

[nichola]

Steve, thanks for those product ideas. But I saw this a half hour too late. I decided to essentially do the same thing with the brass tee that I have... I drilled and tapped it for a ground wire. My car now has the potential to leak fuel, water, and oil.

 

[steveg]

Just bought a new water pump housing and the fitting we're discussing. Both it and the temp sender are 5/8-18 (per Berry above). Threads are not tapered and require a gasket. These are SAE ORB (O-ring Boss) threads; the fitting's 3/8 barb x 5/8" ORB. 5/8" ORB is an odd size.

 

[nichola]

This is my solution, hope it works... pic below. The 5/8 -18 fitting isn’t screwed in yet, waiting on seals. Tee in foreground is for fan switch, background is for TBI computer coolant temperature.

 

[steveg]

Nichola - what's a TBI computer?

 

[nichola]

Patton's Throttle Body Injection (TBI) includes an Engine Control Module (ECM) which I referred to as the TBI computer. It includes sensors for engine coolant temperature(ECT), oxygen in the exhaust (O2 sensor), manifold vacuum (MAP), throttle position (TPM), and a cranking signal to let it know when the engine is being started.