Thread: Radiator hose size ?

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Hi guys !

I'm replacing dome off my none excistion radiator joses but need some help.
I cacan't figure out what size the hose that goes from the radiator to the recovery car/tank ?
This hose:
http://kandtmotors.com/wp-content/up...PHOTO-3253.jpg

Does anyone now that size ?

Kind regards

Assuming it is for your '73 Impala, it should be 1/4" (6.35 mm) inside diameter.

Originally Posted by Henry Rifle

Assuming it is for your '73 Impala, it should be 1/4" (6.35 mm) inside diameter.

Amazing! Do you have some kind of charts, or is it just something you know ? :-)

And its for the Impala :-)

No charts, but 50 years working on cars as a hobby. Older cars generally have the same size hose for that application. To be sure, I checked spare hose in my garage. There's a possibility it could be 5/16 also. That's the standard universal size sold in our auto supply stores. Can't you measure the OD of the parts?

Originally Posted by Henry Rifle

No charts, but 50 years working on cars as a hobby. Older cars generally have the same size hose for that application. To be sure, I checked spare hose in my garage. There's a possibility it could be 5/16 also. That's the standard universal size sold in our auto supply stores. Can't you measure the OD of the parts?

Thanks alot Henry !
I have order one of each now.
Have a nice day

Hi again

I simply loves this forum, it's fantastic for a new guy like me, there know close to nothing about small block's
I therefore got a new question

I want to afterinstall a water temp. gauge, and a oil pressure gauge. Both of the sensor's come with a 1/8" npt.
Can i mount those straigt in the block? I want to mount the water sensor above the sparkplugs on the drivers side, and the oil pressure below the distributer.

Do i need some kind of adapter, and what size ?
The block is a #3970014 if it tells any of you something
I think of adapter like those:
http://contentinfo.autozone.com/znet.../9848/image/3/

Kind regards, and have a nice day

Your engine is a relatively low horsepower 350 Chevy small block. Check THIS WEBSITE

You will get different opinions about the location of the water temperature sensor. I prefer the intake manifold, and have been doing it this way for 40 years. Read THIS ARTICLE and see what you think.

I have always installed the oil pressure gauge sender in the block on the driver's side (LH drive cars) just above the oil filter. Others like the port by the distributor. In my opinion, either will work.

I prefer AutoMeter gauges, but that's just me. They usually come with 1/8 NPT (National Pipe Thread) and an adapter from 1/8 to 1/4 NPT. The adapters in your link don't look right to me. NPT fittings don't have washers because the threads are tapered and tighten by compression.

Hi Henry ( or Jack?)

Thanks for the quick reply! Yes, i have read a lot of different opinions regards the location. My intake manifold doesn't seemed to have an option for the install, so i think placing it here:
http://67-72chevytrucks.com/vboard/a...1&d=1312333319

I have already order some gauges, but the only come with a 1/8 NPT sensor, and no fittings/adapter. Is there any place i cant see the bolt size i need? - Without disassembly my own? I prefer have all the thing before getting started

I will try to find the oil location on the drivers side, can i find it when the motor is in the car? And, maybe a dumb question, does all the oil run out when i remove the bolt?

I've never mounted an oil pressure gauge by the distributor or a water temp gauge in the cylinder head, so I'm going to have to pass you on to someone with more experience for the rest of your answers.

The location above the oil filter is 1/4 NPT, I believe, so you would need a 1/8 to 1/4 adapter. Check THIS WEBSITE Depending on clearances, you may need to use an elbow or other miscellaneous fittings. The distributor location may be best for you.

Oh, and yes, oil will drain if you pull the plug above the filter.

It is Jack, by the way. The "Henry Rifle" screen name is a reference to my great-great grandfather who was a soldier in the 7th Illinois Infantry during our Civil War. Many of his compatriots carried Henry lever-action repeating rifles.

Hi again

I just wrote to Jegs and they told me it's a 3/8 bolt in the cylinder head, i try buy an adapter
Do i need some kind of Fibre washer/gasket when mounting? Or is it not necessary?

Thanks for the clarification with the oil drain, i will then mount the pressure gauge at the same time as a service/oil change

I thought about the 1860 Henry Rifle when i saw the screen name - Funny !

Have a nice day Jack, and thanks for all the help

It's not a bolt - it's 3/8 NPT. Summit has them on THIS WEB PAGE

You also need a pipe thread sealant. THIS WILL WORK or you can use teflon tape. If you use the teflon tape, just don't use too much. Other folks will tell you not to use it, but I've never had a problem with it.

Hi Jack

I though an bolt an NPT was the same, in my world everything you can use a wrench on its a bolt - As i said, i'm new at this

I got some teflon tape somewhere, can i also use regular sealant i use when doing the plumbing under the kitchensink?

Not everything you can put a wrench on is a bolt. There are hundreds of types of nuts, bolts, fittings, etc., that take a wrench. I would not use standard plumbing sealant on an engine. Check THIS WEB PAGE for what I use.

NPT = National Pipe Thread; it is a tapered thread meant to be "self sealing", meaning that the deeper it turns into it's opposite fitting, the tighter it gets. However, in practice, we always use an application appropriate thread sealer on pipe threads. The sealer that Jack referred you to will work fine on both sending units. Here is a Wikipedia treatise on NPT:

https://en.wikipedia.org/wiki/National_pipe_thread

If it worked, I have attached a picture of an Edelbrock Small Block Chevy intake manifold. In the picture, on the left end of the manifold is the thermostat housing, and slightly below and to the left of that is a small hole at the end of a runner that goes to the thermostat housing; that is where the temperature sending unit goes, and you will need the correct NPT to NPT adapter bushing to fit it in there. The next picture is what the adapter bushing will look like, and the correct size will be 1/2 inch male NPT to 1/8 inch female NPT. One thing to remember when installing these sending units is that hey operate by grounding through the place they are screwed into the engine; if you use a sealant that insulates them electrically, they will give you an incorrect reading, or no reading at all. I have always used anti-seize on them because of the dis-similar metals, and it has a metallic component in it's compound that does not cause electrical interference.

Regarding the oil pressure sender, I have most often used the 1/8 inch NPT port next to the distributor, primarily because it was usually the easier one to get to, and it didn't dribble too much oil out when the plug was removed.

I hope this information is helpful.

.

If you're not running a heater that would be a good spot for the sending unit, but normally that hole is used for the return from the heater core and the hole on the right of the thermostat housing is where the temp sending unit would go. The indentation to the right of the hole for the distributor, looking from front to rear of the manifold, is where many folks install the oil pressure sending unit which of course is in the block.