Re: Adjusting Carburetor on 37 six

Posted by JWL On 2014/12/24 11:20:37

Are you talking about all the adjustments needed during an overhaul or setting the choke and idle speed. Never had one of these apart so can't comment on the overhaul adjustments.

Here is how I set the engine idle speed.

Automatic Choke - I set the automatic choke at room temp before installing on the engine. I like the choke plate to be fully closed, but just there and not over tightened. This, and the choke unloading adjustment, may be covered in the overhaul instructions.

Idle Mixture - I first set the idle mixture jet to be 1 1/2 turns open. Turn in the jet to where it just bottoms out, be careful to not over tighten, the back it out 1 1/2 turns.

Idle Speed - With the carburetor still off of the car and the choke plate fully open screw in the idle speed adjustment screw until it contacts the stop, then give it another one-half turn. This should be enough to keep the engine running until you can make the hot adjustments after the engine has warmed up.

Hot Idle Adjustment - with the engine running and at operating temperature adjust the idle speed to specified RPM, then screw in idle mixture jet until engine starts to lose RPMs, then screw out idle jet about one-half turn or until engine smooths out. You may need to to back and forth between speed and idle to get the final adjustment. Some recommend using a vacuum gauge to set the idle, adjusting to get the highest reading.

I hope this helps.

(o{}o)