807-13 Sensors and Coolant Flow - Ron’s 70 S2 Crossflow

[RonPNW]

Some time in the 80’s I purchased a fuel injected R17 with an 807-13 engine. It had already been converted to dual webers and did run at the time. I have long since dumped all but the engine and transmission. So now I’m in the process of doing the install into my 1970 S2 and can not identify some of the sensors despite having the Renault service manual.
Can someone identify the sensors on the intake side identified as A, B and C and on the exhaust side identified as E. At the end of the day I think I’ll just transfer the sensors from the original 821 engine to simplify any instrument calibration issues. It would be nice to know what these sensors are used for before I swap them out. I do have the R17 workshop manual but, oddly, it does not identify the locations or look of the sensors that are referenced in any of the schematics.
Additionally there is a radiator water connection, D, between a fitting on the water pump and the location shown on the intake side. It appears to connect to an internal connection to the water in the block. Again no mention in the workshop manual. Does anyone know what this does and if I need it?
Thanx
Ron

[jbcollier]

A is the block water drain that someone has used a random sensor to plug.

B is the oil warning light switch.

C is the oil pressure gauge sender.

D, are you sure that is a water passage?  It is where the fuel pump goes when running a carb(s).  Either way it can be plugged.

E is the coolant temp gauge sensor.  The larger sensor beside it with the cut off tab is the thermo time switch for the FI cold start injector.

Any sensors from Renault will not work with the Europa's gauges.

[RonPNW]

Thanx for your thorough reply.
I'll have to look at D again. When I started to clean up and refurb the engine it had a hose connected to spigot on the water pump. I have no idea if that was the original intent, a mod of the previous owner or my way of securing the end of the hose decades ago.
It does make more sense that it would be a fuel pump location. I'll give it a more detailed look.
It is both odd and frustrating that the renault factory manual does not have more info.

Thanx
Ron

[GavinT]

My 844 (originally fuel injected) engine looks like Ron's with respect to the water outlet at D.

Mine also enters the head water jacket via a ~12mm dia hole where the fuel pump shaft would normally be drilled all the way through to the cam.
Whatever the intent of D, it can't be used for a fuel pump.
I just plugged it up.

[RonPNW]

Thanx
I'll probably just plug it up.
Do you what it might have been originally used for?
The only thing I can think of is to heat the intake manifold to improve atomization???

Ron

[GavinT]

After scouring the darkest corners of the interwebs, I found these two pics.

One shows an ancillary that would appear to be coolant related given the size of the outlets. I don't know what it is but it appears to have been retained on what looks like a fresh engine running Webers.

Interestingly, the other pic also shows what appears to be a temp sensor nestled in the cast iron alternator mounting bracket. This would be a better place for the Europa temp sensor because the stock wiring becomes cooked because it's located near the hot exhaust.

My old R16TS engine had a similar alternator mount but with a spigot fitted. I used the spigot to feed the heater matrix.
There are also alternator mounts which don't have that hole at all.

More grist for the mill.

[RonPNW]

Impressive search skills. 
I just found this:
"Some fuel injection cylinder heads also feature bracket and water inlet castings on the inlet port side which are
used for fuel injection purposes only. In order to fit Manifold(s) ,it will be necessary to cut bracket casting or to plug the water inlet, or to grind the inlet manifold casting, whatever is easiest. For preheated manifolds
caution however will have to be exerted not to break in water passage."
in the very old PF Engineering flyer on 807 engine install.

I also went through some pics I have collected from the web. One vaguely shows a pump at the
D location, another vaguely shows what looks like an electrically controlled water valve.

So it looks like, depending on version, it is either a fuel pump or a coolant course.

I'll just block it off.

Ron