1959 3100 Accelerator pedal return - The 1947 - Present Chevrolet & GMC Truck Message Board Network

j_cst_10 · 09-01-2015, 11:01 AM

So I am new to the old body style trucks and I have a question regarding the accelerator pedal linkage. It hasn't been driven since 1987, but I recently got it running and am in the middle of trying to get it driving.

The truck is pretty much all original and untouched. The linkage, return spring hanging off the block, etc is all intact and functioning, however the throttle doesn't return all that well when the pedal is depressed in the cab. If you push the rod sticking out of the floor by itself with your hand it snaps back into place nicely, but when the pedal is used not so much.

I was going to try and get a stiffer spring to pull the linkage down more aggressively but I was wondering if I was missing something? I couldn't find a diagram of the pedal all the way to the carb online.

The truck has a 235 straight 6 with the Rochester 1bbl B carburetor, SM420 4spd transmission.

**mr48chev** · 09-01-2015, 12:00 PM

Try lubing and cleaning the hinge part of the pedal and check the rod for binding when it is pushed with the pedal. Cab mounts, motor mounts or something else may have caused just enough shift between components to cause a slight bind in the linkage.

I'd also put a bit of squirt em on each point where the linkage has a pivot point.

OrrieG · 09-01-2015, 12:06 PM

here is the linkage from FAM. If the pedal assy is worn it might be binding the fiber washer at the floor or even hitting the metal. Since it is happening after use maybe heat is a factor causing something on the carb linkage to expand and bind.

j_cst_10 · 09-01-2015, 04:14 PM

Thanks, I just went over the linkage assembly and it is all there and intact. The fiber washer definitely is worn and the hole has considerable slop. I will lube everything up and give it a go. If that doesn't work I might just by a stiffer spring (the spring on it may not be correct anyway, who knows).

j_cst_10 · 09-01-2015, 05:51 PM

Figured out the issue. The hole in the gas pedal where the linkage snaps into it is worn out and won't hold it in place. The linkage rod pops out and binds. I'm assuming they sell stock replacement gas pedals.
Posted via Mobile Device

09-01-2015, 11:01 AM	#1
j_cst_10 Registered User Join Date: Nov 2008 Location: Cleveland, OH Posts: 592	1959 3100 Accelerator pedal return So I am new to the old body style trucks and I have a question regarding the accelerator pedal linkage. It hasn't been driven since 1987, but I recently got it running and am in the middle of trying to get it driving. The truck is pretty much all original and untouched. The linkage, return spring hanging off the block, etc is all intact and functioning, however the throttle doesn't return all that well when the pedal is depressed in the cab. If you push the rod sticking out of the floor by itself with your hand it snaps back into place nicely, but when the pedal is used not so much. I was going to try and get a stiffer spring to pull the linkage down more aggressively but I was wondering if I was missing something? I couldn't find a diagram of the pedal all the way to the carb online. The truck has a 235 straight 6 with the Rochester 1bbl B carburetor, SM420 4spd transmission.

09-01-2015, 12:00 PM	#2
mr48chev Registered User Join Date: Jul 2007 Location: Toppenish, WA Posts: 15,635	Re: 1959 3100 Accelerator pedal return Try lubing and cleaning the hinge part of the pedal and check the rod for binding when it is pushed with the pedal. Cab mounts, motor mounts or something else may have caused just enough shift between components to cause a slight bind in the linkage. I'd also put a bit of squirt em on each point where the linkage has a pivot point. __________________ Founding member of the too many projects, too little time and money club. My ongoing truck projects: 48 Chev 3100 that will run a 292 Six. 71 GMC 2500 that is getting a Cad 500 transplant. 77 C 30 dualie, 454, 4 speed with a 10 foot flatbed and hoist. It does the heavy work and hauls the projects around.

09-01-2015, 12:06 PM	#3
OrrieG Registered User Join Date: Jun 2006 Location: Idaho Posts: 8,800	Re: 1959 3100 Accelerator pedal return here is the linkage from FAM. If the pedal assy is worn it might be binding the fiber washer at the floor or even hitting the metal. Since it is happening after use maybe heat is a factor causing something on the carb linkage to expand and bind. Attached Images __________________ 1959 Chevy Short Fleetside w/ 74 4WD drive train (current project) OrrieG Build Thread 1964 Chevelle Malibu w/ 355-350TH (daily driver) Helpful AD and TF Manual Site Old Car Manual Project

09-01-2015, 04:14 PM	#4
j_cst_10 Registered User Join Date: Nov 2008 Location: Cleveland, OH Posts: 592	Re: 1959 3100 Accelerator pedal return Thanks, I just went over the linkage assembly and it is all there and intact. The fiber washer definitely is worn and the hole has considerable slop. I will lube everything up and give it a go. If that doesn't work I might just by a stiffer spring (the spring on it may not be correct anyway, who knows).

09-01-2015, 05:51 PM	#5
j_cst_10 Registered User Join Date: Nov 2008 Location: Cleveland, OH Posts: 592	Re: 1959 3100 Accelerator pedal return Figured out the issue. The hole in the gas pedal where the linkage snaps into it is worn out and won't hold it in place. The linkage rod pops out and binds. I'm assuming they sell stock replacement gas pedals. Posted via Mobile Device



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