I'm restoring my father-in-law's 68 442. The motor was rebuilt and original intake was placed back on the car. Can anyone tell me what is suppose to go where this brass plug is? The oil temperature sending unit is on the passenger side and there is no corresponding wire harness plug near this brass plug. I've seen other 68's with what appears to be oil temperature sending unit here. Thanks!
Chad

 

I assume this is a non A/C car w/o power steering and manual trans?
Is this the original engine/trans config?

The harness is slightly different between A/C (C60) and non A/C cars.
The alternator is on the pass side for non A/C thus a longer harness coming from the driver's side. Its shown attached to the hole in the engine lifting bracket

Water temp sender should be on the pass side of the intake according to the assembly manual, regardless of C60. I believe the green wire is the H20 temp wire? I don't have my schematic handy.

Nothing goes where the brass plug is.EDIT< False, the TVS should be where the brass plug is on your application. Other applications delete the TVS and pipe plug the hole. The PIM clearly shows all of this>.

A factory plug has a raised square on it.EDIT< some V8s did not use TVS and got the plug>. Not sure if it's supposed to be brass or iron. Brass is better. It should be painted engine color. You could move the water sender over to the brass plug location. Snap a pic the passenger side.

The sender in front of the brass plug is the oil psi sender, blue wire. You have Rallye gauges. There is no factory oil temp only pressure.

I have a mechanical temp gauge plugged into the brass plug location and the opposite hole is plugged off. I could swear that was the factory location for my Fremont car, but I installed the oil & temp gauges 35 years ago.

I just went out to the garage and looked at my mostly original 68 442 with C60 and the water temp wire doesn't look like it could reach the passenger side, though it is tied back and hidden in the alternator harness with the oil psi wire.
But then my early build Fremont car is also void of the passenger side fender A/C relay. Could this be yet another early build Fremont anomaly?

Where do you have the battery negative cable going? It should be on the driver's head in the lowest hole. It's machined with a recessed semi-circle. Wire positioned at approximately 12 o'clock no support clips shown w/o C60 or PW Steering. The red wire is in the way in the pic.

I highly recommend purchasing all the manuals for this car.

 

That plug is in the water passage where the coolant temperature sensor would go.

FYI, there is no "oil temperature sending unit" but the oil pressure sending unit is the round canister in front of your arrow and circle.

It sounds as if you are describing the Distributor Vacuum Control Switch as that would be in the coolant passage on the passengers side and have three vacuum lines attached to it.

edit: I now see you have a '68 so the DVCS may not have been used then.

 

This one is on the passenger side near the front of the block. Meant to say temp sending unit....I have green wire unplug from it at the moment cause I ordered a new one. I just replaced the oil pressure sending unit (why it looks new). Did some vehicle's have the temp sending unit on the driver's side if the alternator was on driver's side due to A/C equipped cars?

 

Thanks for the reply droldsmorland. Correct, non-AC, non-power steering, 4 speed car with gauge package. From what I'm seeing maybe a Ported Vacuum Switch (ACDelco Pro 212-582)?? I'm not sure if all 442's came with this?? I'm sure my father-in-law won't remember.

 

forgot to mention... had to take the battery and inner fenders out to up grade the suspension front/back with Hotchkis TVS which is why negative isn't on the block.

 

Pick yourself up a PIM:

Lower right, 658 S.M. EXC. 35W30

 

All the '68 442 400s, except the W30s got the ported vacuum switch on the drivers side. It didn't matter if it had a/c or not, or stick or auto. It's for temp activated distributor advance control(early emissions control)

 

No, this TVS has nothing to do with emissions. Olds used ported vacuum for the distributor vacuum advance. The only purpose of that TVS is to switch from ported to manifold vacuum if the engine starts to overheat at idle or slow speeds. Switching to manifold vacuum provides additional spark advance at idle, which helps the engine run cooler.

 

Tx all. That will teach me to sleep read a PIM at 1am!
Ill edit my post above to reflect this correction.

I did my car so long ago forgot I removed the TVS and installed the mechanical temp gauge there. Who needed any emissions back then....not me, out it came. I always run straight intake vac to the dist vac adv. It's just better for me and I don't care that's its not 100% correct.

Now I'm curious to see if my connectors are buried in the alternator loom and find the OEM senders. Its not like me to cut OEM connectors off a wire harnesses. Especially with this car. Since day one in 1986, I've had the mindset with this car that someday someone may want to put it back to 100%. I see the blue and green wires coming off the main loom into the alternator loom. Another area that needs to be sorted along with finding where Fremont buried the A/C relay. Your restorations are never quite "done".

 

Thank you Mike!!!