Cooling system drainage point.

[Fernando Mendes]

http://imageshack.us/photo/my-images/580/imagem783.jpg/
http://imageshack.us/photo/my-images/822/imagem784.jpg/
Image 783-Late vehicle
Image 784-Early vehicle(?)
Ask to ricktoys if your Chevy 1942 uses this type showed in image 784?

[rixtoys52]

I will look

[rixtoys52]

Hi Fernando.
Here are pics. My engine is a 1958 GMC 270.
look behind the exhaust header you can see the valve. It is near the back of the engine on the driver side.

A close up . It looks like the one you have.

[Fernando Mendes]

Ok rixtoys52.When I bought my truck in january 2005 I didn't have any manual to know which correct type of cylinder block drain cock for it.Bought with same as the image 783 type I withdraw it and put an used part same as the image 784 type(EARLY).This began to leak during two years.Yesterday I changed again 784 per 783.Now it does not leak and it is original for my truck that is LATE VEHICLE(02-44).

[dr deuce]

ALWAYS use brass fittings there

[rixtoys52]

Glad the new one worked and the leak is gone.

Hey Fernando and Dr deuce,

I have a question about seals.
New seals are much thinner than originals, for example in my transfer case the original is .650 and the new one is .375 . How do you install the new one so it sits the right depth and is in straight. Thanks for any ideas.

[Fernando Mendes]

My engine is a 1958 GMC 270.
I thought there was only 270 engines in years 1941/45.
ALWAYS use brass fittings there(Dr.Deuce)
The correct is use brass fittings between cylinder block and drain cock?? But the drain cock is already of brass.
How do you install the new one so it sits the right depth and is in straight.
Months ago I still found two originals rear axle pinion seals.I think the important is the inner and outer diameters.

[rixtoys52]

Hi Fernando
google tranlate:
Use fita de teflon para uma boa vedação.
Deve ser uma rosca cônica. "Pipe Thread"
Ele vai apertar como ele está ligado.

The GMC 270 was from 1941 - 1962.

[rixtoys52]

Fernando
selos originais são feitos de couro e eu acredito que vai vazar. Eu quero usar selos modernos e os usou em minha M37,

Using Google translator. I tranlate to portugese then back to english to see if it makes sense.

.Usando tradutor do Google. Eu traduzo para o português, em seguida, volta para Inglês para ver se ele faz sentido.

[Fernando Mendes]

Eu prefiro que você escreva em ingles normalmente para que eu possa melhor treinar e aprender.

[Fernando Mendes]

rixtoys52,se você estiver interessado em aprender portugues pode me escrever que eu lhe responderei em portugues,ok?

[rixtoys52]

Eu gostaria que Fernando.

[Fernando Mendes]

Ok.O correto seria você escrever "Eu gostaria Fernando" Abraço.

[dr deuce]

1941-1962 sort of. The later engines ~1950 I think had a different head and pistons to match. The "turbo-top" pistons of the 1941 engines gave way to the flat top in later years

BE CAREFUL

[rixtoys52]

No "que" OK

[rixtoys52]

Thanks Dr deuce. I am still learning about the GMC engines. I just looked up the general years of production. Do you have a source that I can read to see the changes over the years of production?

[Fernando Mendes]

http://www.oldchevytrucks.com/

[dr deuce]

Something seem wrong with the Jim Carter chart. I believe that once they changed the GMC 270, that was it, no more old designs.

I also know the later engines (don't know when) had a bigger intake manidold so the manifold to head gaskets were different.

The 302 (at least) has a different head tightening sequence. Maybe the later 270's also