1936 C30 Radiator Cap


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Rookie
Rookie

Posts: 4

Joined: Sat Oct 21, 2017 10:21 pm

Post Mon Feb 19, 2018 12:09 am

1936 C30 Radiator Cap

I am finding it impossible to find a radiator cap for my 1936 C30 with a GRD 233 engine. Is the only option to cut the fill neck and replace it with a more modern cap? If so, what cap should I consider that looks close to the original? Thanks in advance. Mike

Golden Jubilee
Golden Jubilee

Posts: 2028

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Post Mon Feb 19, 2018 10:47 am

Re: 1936 C30 Radiator Cap

Those big caps are out there. Don't give up, yet. I bought an assortment on ebay that had one.
The cutting off and substituting idea works. The radiator shop should know if you can still find one open. I then install a very low pressure cap.

Golden Jubilee
Golden Jubilee

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Location: Canada's left Coast

Post Mon Feb 19, 2018 1:12 pm

Re: 1936 C30 Radiator Cap

I didn't know those old cooling systems were pressurized?
I would rather have tools I do not need than to need tools I do not have
Thinking risks being controversial and possibly being offensive

Golden Jubilee
Golden Jubilee

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Joined: Thu Nov 29, 2012 9:28 pm

Location: Lyman, IA

Post Mon Feb 19, 2018 5:24 pm

Re: 1936 C30 Radiator Cap

The early IHC's take a "B" size cap, which was STD cap on heavy trucks until recently. Smaller trucks wern't a pressure cap, they just kept stones and small boys from falling into the radiator. The larger K's (and I assume c's and D's had low pressure 4 or at most 7 psi "B" caps. You will not find one at an auto parts store, check with a radiator shop that handles big trucks.
If the orignal was not a pressure cap, and doesn't have the lower "seat" in the filler neck that a pressure cap needs to seal, you can still use the pressure cap to close off the neck, it just will not hold pressure in the radiator.

Rookie
Rookie

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Joined: Sat Oct 21, 2017 10:21 pm

Post Mon Feb 19, 2018 8:46 pm

Re: 1936 C30 Radiator Cap

OK thanks I will try a radiator shop for large trucks and go from there. Appreciate the input from everyone.

Yard Art
Yard Art

Posts: 79

Joined: Mon Dec 03, 2012 10:37 pm

Location: Stettler, Alberta, Canada

Post Thu Feb 22, 2018 10:02 pm

Re: 1936 C30 Radiator Cap

Take a look at Ebay item #272873238874. It looks like a good match.
Dave

Golden Jubilee
Golden Jubilee

Posts: 5171

Joined: Thu Nov 29, 2012 9:28 pm

Location: Lyman, IA

Post Fri Feb 23, 2018 10:32 am

Re: 1936 C30 Radiator Cap

https://www.ebay.com/itm/Antique-car-ra ... 0005.m1851
Looks like a B non pressure cap but is a gas cap. The radiator cap would have the tangs on the outside.
https://www.ebay.com/itm/VINTAGE-STAINL ... G0&vxp=mtr
Looks like a modern car cap spot-welded to a large chrome cover. Not for early cars as advertised. this the cap mentioned above.

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