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235 strange draft tube
#1364394 Thu Jun 11 2020 02:17 AM
Joined: Jun 2020
Posts: 7
O
OskarS Offline OP
New Guy
Hallo,
Im trying to identify how my vent system is supposed to work. Cant find any information on how it is supposed to work, only on the regular drafttube. And cant find any pictures of another 235 with the same setup either!? Has anybody else here seen this setup before?
Thank you/ Oskar

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Re: 235 strange draft tube
OskarS #1364399 Thu Jun 11 2020 02:31 AM
Joined: Mar 2011
Posts: 1,504
J
Shop Shark
I have to say I've never seen a crank case ventilator that looks like that.

What year and model is your truck?

Re: 235 strange draft tube
jorb #1364416 Thu Jun 11 2020 04:33 AM
Joined: Jun 2020
Posts: 7
O
OskarS Offline OP
New Guy
It is a 51 gmc but with what i understand a 58-62 235.
No i cant find any info or pictures of anything like it either

Re: 235 strange draft tube
OskarS #1364432 Thu Jun 11 2020 11:46 AM
Joined: Jun 2011
Posts: 3,603
E
Shop Shark
GMC trucks have a similar setup.

Ed


'37 GMC T-18 w/ DD 4-53T, RTO-610, 6231 aux., '95 GMC running gear, full disc brakes, power steering, 22.5 wheels and tires.
'47 GMC 1 ton w/ 302, NP-540, 4wd, full width Blazer front axle.
'54 GMC 630 w/ 503 gasser, 5 speed, ex fire truck, shortened WB 4', install 8' bed.
'55 GMC 370 w/270, 420 4 speed, grain, dump bed truck from ND. Works OK.
Re: 235 strange draft tube
OskarS #1364470 Thu Jun 11 2020 04:54 PM
Joined: Jan 2000
Posts: 2,059
J
Shop Shark
Oskar, is that a 261ci motor, looks like captains bars above starter. if it's a big truck may explain this odd draft tube cannister, lots of after market stuff got added back in the day, you can swap to original type tube if this set up doesn't function. If those three mounting holes are tapped for threads it's a passenger car motor, if no threads it's a truck motor fyi.
Best of luck


It's easier to get forgiveness than permission!
1946 1/2-Ton Chevy [stovebolt.com]
1953 Chevy 3/4-ton Factory Stakebed [stovebolt.com]
Re: 235 strange draft tube
OskarS #1364472 Thu Jun 11 2020 05:17 PM
Joined: Sep 2009
Posts: 302
G
Shop Shark
Looks like a 235, I dont see any captains bars.

That looks like a GMC standpipe to me. 235's had the downward-turned draft tube.


-Patrick
1953 Chevrolet 3100
261 / 4-speed / 4:11 / Commercial Red

Re: 235 strange draft tube
OskarS #1364535 Fri Jun 12 2020 02:09 AM
Joined: Mar 2004
Posts: 4,606
M
Shop Shark
Wire brush the flat machined surface right behind the distributor and tell us what's stamped there.

There is also a date code right next to the dip stick tube and a casting number between the three bolt bosses. With that info we can tell you what you have...

Mike B smile

Re: 235 strange draft tube
OskarS #1364540 Fri Jun 12 2020 02:44 AM
Joined: May 2005
Posts: 7,371
B
General Purpose
You may be saying 58-62 because that is when the oil cap was in the middle. Found one oil breather filter assembly on a 1956 GMC 270, pickup. Supposedly original. Found others on WWII GMC big trucks. Also a 1941 CCKW, 270 motor. These have a little different configuration. A piece is offset?? This is a stumper but a really neat accessory to have.


I'm away on an ego trip. Will be back on Feb 30.
I'm not an Auto Mechanic, but I play one on TV.
I charge $0.02 for every opinion and I take Paypal.
Plan B is always better than plan A, by definition.


Re: 235 strange draft tube
bartamos #1364564 Fri Jun 12 2020 08:13 AM
Joined: Jun 2020
Posts: 7
O
OskarS Offline OP
New Guy
The casting number on the block is 3769716, heads 3836848
Above the starter is CON4 - L19D
I dont se any capten bars, i think its just dust/rust that makes it look that way.

How does the gmc standpipe work?

Re: 235 strange draft tube
OskarS #1364670 Fri Jun 12 2020 09:18 PM
Joined: May 2005
Posts: 7,371
B
General Purpose
It seems to have a large lid with snap clips for the filter? and a screw cap for filling? Don't even know if it's an oil filled unit or not. Just a guess, open it up and let us see inside.
Hopefully the person who put it on there knew what they were doing because the valve cover cap is not a breather type and don't see any slots in cover. So how does your unit breath? Has to be open somewhere. Don't see where in the pics. I'm hoping it's not a mixture of the wrong parts for crank case ventilation.

When Chevy went to center valve cover fill cap and no slots, they had a breather cap. You don't. Maybe this unit takes care of the "in and out" ?


I'm away on an ego trip. Will be back on Feb 30.
I'm not an Auto Mechanic, but I play one on TV.
I charge $0.02 for every opinion and I take Paypal.
Plan B is always better than plan A, by definition.


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