What size is this fitting on the block

[iwantspeed]

It can be seen at the back of the block top right.

It's either a m12x1.5 or m14x1.5
I'd like to order a bolt to block off and replace the fitting

Throttle body heater is currently looped
I'd like to make it more permanent.

[TurboJake]

Take it off.
Take it to Ace hardware
Measure
Buy bolt
Block off.

If Ace doesn't have it. Fastenal will have it.
If Fastenal can't get it. It isn't made.

Also, you can buy metric and NPT block off fittings.

[MR 325]

I prefer to run 3/8" bulk heater hose from that fitting straight to the thermostat housing as opposed to changing the coolant flow in the engine.

[jlevie]

I prefer to run 3/8" bulk heater hose from that fitting straight to the thermostat housing as opposed to changing the coolant flow in the engine.

^This!

The cooling system was designed to accommodate flow all the time through the throttle body heater hose. There is no way to predict how blocking that affects the system. The affect may be small, but it will be there.

[dandrewg]

IIRC it is the same thread as the oil pan plug. I'm pretty sure this is what I used.

Wouldn't plugging this hole have the same effect as operating an unmodified system with the heater control set to full cold? Doesn't that block flow into this plug anyway?

[dandrewg]

Wait, maybe it was another coolant plug that I used. The one on the opposite side used for draining coolant from the block. I know I used a stock plug found elsewhere on the engine.

[jlevie]

IIRC it is the same thread as the oil pan plug. I'm pretty sure this is what I used.

Wouldn't plugging this hole have the same effect as operating an unmodified system with the heater control set to full cold? Doesn't that block flow into this plug anyway?

That fitting isn't part of the heater loop. It is for the throttle body heater and has full time flow. The heater loop fittings are on the thermostat housing and the rear of the cylinder head. If one wants to delete the heater those fittings need to be plugged. You can use a blank off plate on the rear of the cylinder head and a short hose an plug on the thermostat housing. Don't loop the heater hoses.

[Cabriolet]

yes Jlevie and MR325 are right. dont block off that port. you need the water flow through that to go back to the thermostat housing. you can delete the throttle body heater and just run the line from the block to the thermostat housing.

as for blocking off the back of the head, if you are racing the car dont block it off completely. cylinders 5&6 will run too warm. you can bypass the heater core with an early model coolant hose.

[jlevie]

yes Jlevie and MR325 are right. dont block off that port. you need the water flow through that to go back to the thermostat housing. you can delete the throttle body heater and just run the line from the block to the thermostat housing.

as for blocking off the back of the head, if you are racing the car dont block it off completely. cylinders 5&6 will run too warm. you can bypass the heater core with an early model coolant hose.

You were doing good until you got to the heater core fittings. If you don't block off that flow part of the coolant circulation will loop from the pump to the head and not go through the radiator. In normal operation the heater core valve blocks all circulation from the thermostat housing to the head when the heater is off. If you are going to remove or disable the heater core, that path must be blocked as I stated earlier.

[digger]

either way realoem says M12 http://www.realoem.com/bmw/showparts...17&hg=11&fg=10