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Re: 1959 GMC 9600 dump truck - Resurrection Puffie40#1537274Mon Feb 19 2024 08:20 PM |
P Puffie40 'Bolter |
I Noticed the grease cup on the distributor is interfering with the vacuum advance mechanism. Is this normal? Last edited by klhansen; Mon Feb 19 2024 08:28 PM. Reason: fixed image display Canadian GMC 9600 with a dump box |
Re: 1959 GMC 9600 dump truck - Resurrection Puffie40#1537276Mon Feb 19 2024 08:26 PM |
7 78buckshot 'Bolter |
A vacuum reservoir will be a steel tank, typically mounted under the cab or step. I recently added a tank to my truck, it did not originally have one with only having the HydroVac brake booster. I installed a 2-speed rear differential and thought for good measure a reservoir would add some vacuum capacity for shifting and braking. I used an empty 30 lb. refrigerant cylinder as the reservoir and mounted it on the passenger side under the step. The factory provided a tee in the vacuum line and a hole in the frame rail at the tee. Last edited by 78buckshot; Tue Feb 20 2024 12:52 PM. 1957 Chevrolet 5700 LCF 283 SM420 2 speed rear, 1955 IH 300U T/A, 1978 Corvette 350 auto, 1978 Yamaha DT175, 1999 Harley Davidson Softail Fat Boy |
Re: 1959 GMC 9600 dump truck - Resurrection Puffie40#1537277Mon Feb 19 2024 08:32 PM |
klhansen Housekeeping (Moderator) Making a Stovebolt Bed & Paint and Body Shop Forums |
Originally Posted by Puffie40 I Noticed the grease cup on the distributor is interfering with the vacuum advance mechanism. Is this normal? I believe you can reposition the distributor to move the grease cup away from the vacuum advance. You may have to move the gear mating to the crankshaft by a tooth, making sure that you get the oil pump engaged as well. Your spark plug wires may have to be moved by one position on the cap. On the vacuum reservoir, a good idea is to put a check valve between the vacuum source and the tank and the rear axle (or whatever is using the vacuum). That keeps the vacuum reservoir fully charged and available even if the engine isn't running. Last edited by klhansen; Mon Feb 19 2024 08:34 PM. Kevin |
Re: 1959 GMC 9600 dump truck - Resurrection Puffie40#1537284Mon Feb 19 2024 09:01 PM |
7 78buckshot 'Bolter |
If the truck came stock with HydroVac brakes, which it sounds as it did, there will be a check valve in the system mounted on the engine bay firewall. Follow the 1/2" vacuum line from the engine up to the firewall, the first thing should be the check valve. 1957 Chevrolet 5700 LCF 283 SM420 2 speed rear, 1955 IH 300U T/A, 1978 Corvette 350 auto, 1978 Yamaha DT175, 1999 Harley Davidson Softail Fat Boy |
Re: 1959 GMC 9600 dump truck - Resurrection 78buckshot#1537401Tue Feb 20 2024 05:22 PM |
P Puffie40 'Bolter |
I can confirm there is a hydrovac unit on this guy on the opposite side of the frame rail to the master cyilinder, and there is what I am presuming is the check valve mounted on the firewall: Canadian GMC 9600 with a dump box |
Re: 1959 GMC 9600 dump truck - Resurrection Puffie40#1537408Tue Feb 20 2024 06:48 PM |
7 78buckshot 'Bolter |
I took the check valve apart and cleaned it, seems like better vacuum since I did that, it may have sticking partly closed and not allowing full vacuum to the HydroVac. Your pic shows the check valve. 1957 Chevrolet 5700 LCF 283 SM420 2 speed rear, 1955 IH 300U T/A, 1978 Corvette 350 auto, 1978 Yamaha DT175, 1999 Harley Davidson Softail Fat Boy |
Re: 1959 GMC 9600 dump truck - Resurrection Puffie40#1537436Tue Feb 20 2024 10:59 PM |
H Hotrod Lincoln Kettle Custodian (pot stirrer) |
There's no need to remove the distributor to re-clock the housing. Just loosen the pinch clamp below the housing and turn the distributor one wire position, and re-route the wires. You will need to reset the ignition timing, however. "It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln |
Re: 1959 GMC 9600 dump truck - Resurrection Puffie40#1538093Sun Feb 25 2024 10:48 PM |
P Puffie40 'Bolter |
I opted to pull the distributor because I couldn't get a good enough grip on the slotted pinch bolt screw. I turned a spacer up so I could replace it with a 1/4" hex head bolt. While I was in there, I replaced the well-worn ignition points and condenser. I was putting the distributor back in, and wiggling the motor back and forth to get the distributor to engage with the oil pump, when I made the realization that the motor is turning over a little TOO well for an engine with the transmission in gear! I'll focus on getting the motor running to confirm it, but I'm thinking a new clutch is on the horizon. Looking on RockAuto I found a couple of clutch kits with the part number MU54731B and MU90911. Will either of these fit my 261? It has a five-speed transmission. Canadian GMC 9600 with a dump box |
Re: 1959 GMC 9600 dump truck - Resurrection Puffie40#1542548Tue Apr 02 2024 05:39 PM |
P Puffie40 'Bolter |
This weekend I soldered the frame back onto the radiator, and it appears to hold water just fine. I finished wiring up the ignition and headlights, poured some two-stroke gas down the carb and after determining I had the timing a classic 180 degrees off, got it to run! It does look like I will need to change the manifold gasket as there are some leaks on the back end. I'll take a wrench to the manifold to see if the bolts are loose. It seems the clutch does have some grip, from cranking the motor the flywheel needs to "wind up" a partial turn before the driveshaft starts to turn. I've never actually seen this before - the clutches on our farm tractors are more like a light switch so I'm not sure if this is a feature for the two-speed axle or something else. Since I got the motor part on the run, I pulled one of the front hubs to look at the brakes. One of the brake shoes is rather thin but I think I can reuse it. The wheel cyilinder is pretty crusty with powdery corrosion behind the dust boots. Any idea what the part number of the wheel cyilinder is? I saw on another thread someone mentioned the part number NAPA 15315 but I'm not sure if that was in response to my question there. I presume the wheel cyilinder size is based on the piston bore size? Canadian GMC 9600 with a dump box |
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