C8 progress in Texas

Grant Bowker · #1 13-04-10, 00:00

Bob, are you sure?
If it were a normal CMP with the tanks mounted long axis along the truck's frame I would agree that it is the right hand tank. The photos of the C8 show the tank(s) mounted crosswise under the tire carrier. It appears that the tank with the offset that we normally associate with the left side is the right, not left tank on a C8. Unless the tanks and tire carrier are mounted turned 180 degress in the photo, it looks like the offset in the filler neck on the C8 is different as a guide to the tank position compared to most other CMPs.

David DeWeese · #2 13-04-10, 02:27

Thanks for the replies!
Gordon:
I noticed while working on the 1.5 ton Chev that someone "clocked" the tire mold wrong when they made the tire as the tread is not staggered like NDT's should be. The tread lugs are directly across from each other.
Andrew:
Thanks a lot for the photos. They really help and are very much appreciated!
Bob:
Here are a few photos of the tank cast piece after I cleaned it up a bit.
Noticed that it appears to be made of copper? Was tarnished to a deep blue-green on the inside before clean-up and the brass pieces,(arrow), are much yellower than the reddish tinted casting.
There is an "R" stamped into this casting also. Does this mean it's for a right side tank?
There is a notch cut in the front fuel tank support rail even with the fuel outlet in the tank. Is this where the fuel line should be routed?
If this is a left-side tank my brass tank outlet is facing the rear of the truck, and the casting can't be rotated 180 degrees due to the "reserve" feature made into the tank.

Thanks, David

cletrac (RIP) · #3 13-04-10, 02:35

The two drawings are from Mile Kelly. In the side view you can see the hole for the filler is offset to the back of the truck. I can't find any pics showing this hole on the other side but wouldn't both tanks be the same which would make the pass one offset to the front? There'd be no reason to make them different on the 1A2 and that was the only style they made in 1940. In the other two pics you can't really tell but in the assembly shot you can see the fuel lines hooking on to the front and rear which would indicate that the tanks are the same. Andrews pic is a resto so who knows if it's right? Also notice how short the filler necks are.

Bob Carriere · #4 13-04-10, 03:55

The first picture up showed is defenitely a right hand side tank.....driver's side..... with the oval plate... but now I see how they have reversed the tanks from left to right to insure the filler cap is closer to the truck cab and near the outside for access...... at the same time it allowed to centralized the two oval plate for fuel line hook up....... wonder if they did that on purpose to screw up guys like us trying to restored them 65 years later.

Thanks for the oval brass plate close up...... my best two tanks are steel adn there are some marking differences in the letterring and reserve lever shape....... again I have two different type of levers for the reserve... one of which is identical to the 3 way valve.

Have you tried to remove one of the oval plate...? we have been soaking a lesser example with GBS to loosen up rust and will try our hands with a hand held impact screwdriver......

Never ceases to amaze me all that is left to be learn about CMPs....

Boob

David DeWeese · #5 13-04-10, 05:22

Thanks David and Bob for the great information! Lots of food for thought now on the subject of fuel tanks for an 8cwt CMP.
Here's another photo that I thought was interesting...
These tanks are still on their correct sides for a side mounted CMP tank configuration, but just mounted 90-degrees counter-clockwise on the C8 version.
Photo courtesy of Mike Kelly's CD.
Thanks, David

aj.lec · #6 13-04-10, 09:32

Interesting

Had a look through some more photos and would make more sense to have the fillers to the back if you had a chorehorse fitted as the bracket would foul when filling .
Managed to find a factory chev photo of the passenger side that shows filler to rear
I wonder if they fitted the tanks differently depending on body type and configuration ?

cletrac (RIP) · #7 13-04-10, 14:09

Here's two factory pic closeups of the pass side filler holes. The Ford seems to have a bigger hole than the Chev. I went through my pics and it seems the cab 11s all used the same fillers on the tanks. The cab 12s and 13s used a longer filler neck. By the way the Ford is the one with the wood bracket under the tank.

David DeWeese · #8 19-04-10, 00:28

Hi,
Thank you Andrew and David for clearing things up with the factory photos.
Spent the weekend working on my fuel tank. Tank luckily was dry inside with no varnish. Someone had pulled the drain plug years ago and it had saved the tank.
Prepped and coated the inside of the tank with a quart of fuel tank sealer, sanded it down to bare metal, then primed and painted it. Fortunate to have at least one good tank to work with!
As you can see, my other tank has a slight problem.....
Spent the rest of the day fabricating the parking brake linkage that was missing under the fuel tank support rail. Thanks again Andrew and David for your postings on the linkages earlier in this thread. The information was a great help!

Thanks, David