ERR4820 thread size?

[antichrist]

ERR4820 is the heater feed connector that screws in to the inlet manifold that the reducing rubber hose connects to.
The thread appears to be 1/2" NPT, but I'm wondering if anyone knows for sure.

If it's actually 1/2" NPT I want to replace it with a hose barb that fits the heater hose and do away with that oddball short hose.

Unless someone knows a rational reason why it's the way it is from the factory.

 

[KyleT]

if its not NPT, i would be suprised.

 

[antichrist]

I needed to replace the short reducing hose (PEH101170) which ranged in price from $5 at Rovahfarm to $20 at Miami British. I figured a $3.50 hose bard and 25 cents worth of heater hose would be a better deal. The ID of the new barb is within .05mm of the ID of ERR4820 so I can't see any impact at all to coolant flow.

 

[listerdiesel]

It will probably be BSP thread, unless Rover decided to go American on the engine.

http://www.stationary-engine.co.uk/Tables/bsp1.htm

Note that sizes for BSP are by the inner pipe diameter, NOT the thread size.

Peter

 

[Durt D1ver]

Note that sizes for BSP are by the inner pipe diameter, NOT the thread size.

As is NPT. 1/2" npt is half inch ID also.

 

[antichrist]

I wondered if it might be BSP, but the NPTF fits by hand like it's NPTF. Hard to say for sure since other things on the manifold are tapped "American", like the plenum bolts.
I'll certainly post a follow-up if it leaks.

 

[robertf]

As is NPT. 1/2" npt is half inch ID also.

no its not

you need a wall thickness or schedule to determine the ID

I hear morons all the time say stuff like tube is measured by OD and pipe is measured by ID

look at the external diameter of a 24" NPT thread

 

[antichrist]

Pipe, in the US anyway, is measured by the ID up to 12". 14" and above is the OD.
The nominal size of 12" and under isn't the actual ID, though for something like 1/2" if you go with schedule 80 (which you won't find at home depot) it's pretty close to 1/2", but still not actually 1/2".
14" and above the nominal dimension is the actual OD size so 14" pipe actually has a 14" OD.

For anyone who cares, here's a chart. http://www.allsteelpipe.com/Pipe-Dimensions-Weights-Chart.pdf
Subtract 2x the wall thickness to get the actual ID.

 

[robertf]

Pipe, in the US anyway, is measured by the ID up to 12". 14" and above is the OD.

again, no it isn't, at least pipe that conforms to ASME B36

 

[Durt D1ver]

Im sorry, I meant to say nominally by the id. I didn't realize it was necessary to state that the actual id differs from the nominal id depending on the schedule, material, and application, for most commonly used pipe and conduit sizes used by the average person.

 

[antichrist]

This disagreement about pipe measurement aside, I went with the hose barb pictured above and there haven't been any leaks. Allows use of a much cheaper hose.