The GMC CCKW

Have been offered a early dash cluster, but unsure of the following on this cluster:

Oil pressure gauge range is from 0 to 30psi, manual for my CCKWX states oil pressure whilst driving should be around 33 to 40psi.

Engine temp gauge appears to be carpillary tube, manual indicates a electrical sender and gauge.

Should it have GMC marked on dash?

Any help would be appreciated, I am trying to convert my CCKWX back to this early system, at present it has the later 5 seperate gauges.

Thanks in advance

Rob

It is a Cheby. Oil pressure gives it away

Thanks Dr Deuce, thats cleared that up.

On my August 1941 cckw352 truck, oil pressure ranges from 40 to 80 psi. The temperature gauge is operated with an electrical sender + wire but doesn’t work. Does anyone of you guys know how to test if rather the sender or the gauge is out of order? Also, do you know of a parts source for for those early temp gauges/sender ?
I found another spare dash cluster that came for sure from another early GMC truck ; on this one the temperature unit is the capillary type. Unfortunately the tube has been cut just a few inches from the gauge This would mean that both systems were probably used on early trucks!?!?! Any information on that
Is the fuel level sender the same as on the standard round military gauge?
Pictures of both dash clusters can be seen at : http://thierry.becker.free.fr/GMCcckw352B1-1941.htm Picture 4 shows the unit mounted on the truck that has an electrical sender ; picture 5 shows the spare cluster I have that has the capillary temp unit.


Thierry

I think if you ground the wire or open the wire it should read max and min though I am not sure which way is which. Just touch it to ground though, don't hold it there.

If it is the same as the later 50's senders, I may have one you can have.

Thank you Steve... Will try this next time I'll go to work on the truck..


Thierry.

A manual I have for the CCKWX shows in the electrical diagram, the circuit for the temp. gauge & sender, is it possible the Chevy dash was the capillary type, and used in the GMC if the electrical unit failed ??

Thierry,

If you are still looking for a eletrical temp sender, see: http://www.egauges.com

Can you let me know where the electric sender is installed in the engine?
I´m converting my truck to the electrical system and it only has the mechanical type, with port in rear of cyl head.

Thanks,

Hi Ducatti,

I don’t have the truck here so I can’t say now where the sending unit is located, but as many as I can remember it is on the same location as the capillary unit, on the rear end of the engine.
I found a NOS capillary Unit here in France. It works great so I think I’ll put it on the truck. Have you already bought a sending unit and does it work on your truck? If so, what is the part number of that unit?

ThierryB.

Electrical sending unit originally went on the thermostat housing on CCKWs up to Chassis Number 41189.

Thierry,

I found a sender in the USA ( egauge.com). Just received it and did not tested yet, but it has the right specs for the gauge
See the one with 0-30 ohms:
http://www.egauges.com/vdo_send.asp?Sen ... sic_30ohms


Joel,
My termostat housing has no port.
Would be possible to install in the elbow to the steam tube?

thanks,
Ducatti

It can be installed at the fitting on the Cylinder head that is normally used for the mechanical guage. I do have a CCKWHX thermostat housing stored away.

Ducatti,

I’m a bit lost…The link you've posted is for a fuel level unit, not temperature


Thierry.

Thierry,

Sorry for the confusion.

Here is the correct link for the temp sender I´ve bought:

http://www.egauges.com/vdo_send.asp?Sender=Classic_Temp

Part number: SN24

Regards,
Ducatti

COOL...many thanks...

Let us know if it work and I'll order one too...


Thierry.

Recently purchased a complete early dash cluster, the seller told me this was removed from a CCW which he had cut up , he said nobody wanted the 6 x 4, they wanted 6 x 6 trucks, any way the temp. gauge is the capillary tube type, was this original or changed at some later, possible post war.
I also bought a wiring harness, NOS in box, its the engine/dash harness, when I checked through, found this to be a harness for early GMC, only 2 panel lamp bulb holders, also has cable for engine temp. sensor, this was bought for my Shop Van, but will fit my CCKWX better .