The Stovebolt Site Forums The Shop Area Engine Shop Temperature Sensing Bulb and Oil pressure Line

I am trying to figure out where the thermostat temperature sensing bulb goes on a 235. I have a spot on top of the head which I thought was correct but I also have the same size thread just below the carb on the exhaust manifold which I have no idea what that is for. Both threads however are just slightly loose for the thread on the thermostat sensor. So first off where should this go and secondly when switching to the 235 from 216 does it require a different size plug with a smaller thread? Lastly, what is the hole for that's under the carb?

As far as the pressure sensor line, I see one end is slightly longer than the other. Which end goes which?

Pics included.

Thanks for the help!

The temperature sensing bulb goes in the port in the head (second picture).
In your first picture, that's a port for a vacuum line (to the wipers and in the case of a vacuum operated 2-speed axle, for that.) It looks to me like that tapping has been enlarged for the vacuum requirements for a 2-speed axle. What did the engine come out of?
The last two pics look like the line between the oil gallery and the oil pressure gauge. It doesn't matter which end is which as long as the captive ferrule on the nut seals against the tube. It looks like in your pic #3 that the nut has been slid up the tube a bit. It would have been where the ring around the tube closer to the end. I would cut that compressed section of the tube off.

What Kevin said - Temp sensor on top. I ended up plugging my vacuum port on the intake manifold for now. I might decide to get electric wipers later.

The compression fitting on the oil line is a "one time use" item. Since it has slipped away from its original position, it will leak if the line is reinstalled. Cut the line back a little and acquire a new compression nut to install the line. The first time a new nut is tightened it swages itself into the copper tube, creating the indented section in the tubing and sealing itself. NAPA stores used to sell that nut- - - - -but they're getting a little scarce since they haven't been used much in the past 50+ years. There is a corresponding female fitting that the nut threads into.
Jerry

To answer your question about where the thermostat goes;

Locate the top radiator hose. The lower end where the hose is clamped there are two bolts that hold that piece to the engine. If you take that apart, you are then looking at the thermostat.

Kent

I know the OP was asking about the thermostat, but I'm thinking he was talking about the temp sensor since he was showing the hole where the sensor goes. But good to cover what he actually asked.

I've reused captive ferrule fittings successfully, but if the tubing is already compressed, a new section should be used. At some point, the fitting won't tighten enough to be leak free, like Jerry said. But captive ferrule fittings are still available. HERE Probably other places as well.

Thanks for all the replies and pictures. Very helpful. The port on the carb was plugged off so I will just put it back in.

Hey jasrking, I the pics in your original post I noticed the valve cover has the hole for the fresh air inlet used with PCV system. I' ve only seen that on 261.
You might check the block cast number, capt. bars etc .

thanks bc59.. i will check