Category Archives: “59 Apache

First Truck: The ’59 Apache (update)

What to do when you have a big old barn with a cement floor and electricity? Go find an old truck, of course. In this case, we jumped in with both feet and ended up with a somewhat sorry 1959 Chevrolet 3100 Apache, short bed, step side, small window.

A few words about the “patient.” The truck would barely run as the carb was spewing fuel through the throttle shaft. During the test drive the previous owner almost slid the thing through a stop sign into cross traffic because only one of the drum brakes seemed to be doing its job. And the god awful bench seats smelled like an open sewer. On top of that, the left front corner of the cab was low due to a rust problem where it mounted to the frame.

The Apache is finally back on the road with a fresh coat of satin black paint, a freshened 350 engine, and a long list of fixes and improvements. There is still plenty  to do, but it is now a fun driver (and work truck – this Apache can haul!)

Heart of the 1959 Apache, the fresh 350 engine
Heart of the 1959 Apache, the fresh 350 engine… check the rebuild article posted previously.

We shored up the front cab corners with 1/4 inch steel, rebuilt the drum brake system, added new shocks all around, installed a drop axle at the front, and lowered the rear to match it by re-curving the main leaf spring and removing the supplementary extra stack of leaf springs. We replaced the rear cab corners and then spent weeks cleaning up the body and chassis and prepping for paint.

Using string and tape to line up the bed with the cab prior to mounting on the frame.
Using string and tape to line up the bed with the cab prior to mounting on the frame.
The colors lurking under that old black paint.
The colors lurking under that old black paint.
1959 Apache with light gray primer applied.
Checking out the fender emblem and Boyd’s 17 inch rims against the light gray primer. Next truck might be light gray!

At this stage, we have stuck with manual 4-speed Saginaw transmission, manual steering, and the drum brakes sans power assist. However, having just added CPP’s easily installed power steering and power assist brake kits to the ’56 “Farm Truck,” these improvements might soon appear on the Apache.

The rear end is a bit noisy, but we’re living with it for now, until the Farm Truck is finished and on the road. At this point, it’s just time to enjoy driving the big hunk of steel. The rake of the chassis, with the front end low, and the 3.90 ratio rear end make it feel sporty on the twisty roads between home and shop.

The '59 Apache looks like a compact truck next to bro's GMC hauler... it does haul with 900+ lbs of torque.
The ’59 Apache looks like a compact truck next to bro’s GMC hauler… it does haul with 900+ lbs of torque.
New tailgate and a little bright stuff at the rear of our 1959 Apache
New tailgate and a little bright stuff at the rear.
1959 Apache truck in driveway ready to cruise.
The Apache ready for a cruise.

The Barn’s “first truck” isn’t a show stopper, nor is it completed to our satisfaction yet. On the other hand, our key phrase for the Apache during the build was “next guy.” So maybe it will just change hands as is, to add a little to the budget for our next project… the ’58 GMC seen behind the Apache in the title picture.

1959 Apache loaded with tires for the '56 Farm Truck
The Apache hauls… new 17.5 radials for the ’56 Farm Truck.

 

 

Engine Test Stand

We rebuilt the 350 for the ’59 Apache, including:  main and rod bearings; rings; camshaft; lifters; pushrods; oil pump; fuel pump; water pump; harmonic balancer; Edelbrock Performer manifold; Edelbrock 1406 carburetor; small chamber heads; timing chain set; valve covers; oil pan; and new freeze plugs and gaskets.

An important part of the rebuild was knocking out all the water jacket plugs (aka freeze plugs) and using our high pressure washer and compressed air to remove the chunks of rusty metal that are detrimental to cooling efficiency.

After putting it all together, there was no way I was going to stick it back in the truck without testing it first. We happened to have two heavy duty metal tables, one with a metal top that serves as our welding table. The other had a wood top and it became the temporary engine test bed. A little surgery removed the angle iron on which the wood top rested, allowing us to drop an engine into the middle. Here’s what it looked like…

Keeping it simple.
Adding the necessities.
The most important (only) gauge… oil pressure.
Have starter button, will travel.
Ready to go. On/off toggle in the tray, which holds gauge, pistol-grip starter button, and coffee. Might have been whiskey.
And it’s a table again, waiting for next rebuild. Bolt-in rails along the side replaced the welded originals, so the wood top is still supported lengthwise.

Decoding the Apache

So, we bought the ’59 Apache. Generally, we knew what we were getting, but what exactly did we buy? Time for a little detective work.

It has a 350 small block Chevy engine. The number at the rear of the block on the driver side tells us that this is a 3970010 block casting, which had a ten year run, from 1969 to 1979, and was used for 302 and 350 cubic inch engines.

Rear of block, driver’s side.

To get a little more specific information, we looked for the engine’s three letter suffix, in our case “CGC,” found on the passenger side of the engine just below the cylinder head at the front. Turns out our engine was 350  from 1971 with 245 hp. It would have been installed in an El Camino with the turbo-hydramatic, or a full-size manual transmission car, police car, or taxi.

Front of block, passenger side.

The “11J” at the beginning indicates the car was a Chevrolet, model year 1971, built at GM’s oldest assembly plant in Janesville, Wisconsin (set up in 1919, and shuttered in 2009). The beginning of the engine code “V0215” indicates the engine build was at the Flint plant on February 15th.

Under the valve cover.

Removing the valve covers revealed the cylinder head identifying numbers “3973487” which indicates that this is a “smog” head with 1.94 intake / 1.50 exhaust valve diameters.  Not a good base for making power because of the size (76 cc) and shape of the combustion chambers. We ended up swapping these heads for ones with a 58 cc combustion chamber, just to put a little more pop in the explosion… more on that in a future post about the engine rebuild.

It was easy  to identify the transmission as a Saginaw. These manual gearboxes have seven bolts fastening the side cover and all three shift levers are on the side cover. The Muncie also has seven bolts securing the side cover but the reverse shift lever is on the tail housing.

photo from http://chevellestuff.net/qd/muncie.htm

The final piece of the drivetrain  – the differential – yielded its specifications, as well, once we were able to guess correctly at the last digit of the casting number.

A Google search on GM differential 3707340 pointed us to a number of gear vendors. They revealed the same information…

  • GM ’55 – ’64   1/2 ton truck
  • drop out carrier
  • 10 bolt rear cover
  • c/clip axles
  • 12 ring gear bolts (3/8 x 24)
  • ring gear diameter:  9.375″
  • pinion nut size 1 – 1/8th”

Yukon Gear, Randy’s Worldwide, and Sierra Gear all list a GM55T-338 replacement ring and pinion with a 3.38 to 1 ratio along with all the other parts necessary for a rebuild. I would choose that ratio over the Apache’s, which seems to be a 3.90 ratio. In fact, I’d like to go even further via an overdrive transmission. If I could find a three-speed Saginaw with overdrive – for a reasonable price – I would swap it for the four speed in a heartbeat.

But first things first. Unfortunately, the Apache’s rear end is making the worn-ring-and-pinion howl and that means I need to put it on the bench for inspection and adjustment or replacement.

Website pages for reference:

http://nastyz28com

http://outintheshop.com

https://www.ringpinion.com

https://www.yukongear.com/

http://sierragear.com/ring-and-pinion-gear-sets-gm/

 

1959 Chevrolet Apache: Impetus for the Engine Rebuild

From the day we bought the Apache, it needed an engine rebuild. Perhaps the biggest factor in its poor-running was the Rochester Quadrajet carburetor. I know they are a fine when in good condition, but this one was well past its “use by” date. It was in need of a complete rebuild or replacement.

We tolerated the crappy running motor while busying ourselves with body and interior jobs, and brakes, and steering. Until one day, this happened. The truck had been sitting for three days on a slope with the nose down. I tried to start it but the battery wasn’t strong enough to turn it over. After charging it up for half an hour, I checked the voltage and gave it another try. Still it wouldn’t turn over!

Inspecting the engine, I noticed a couple little puddles of gasoline on the intake manifold. Then the light bulb went on… I reckoned that the Q-Jet’s floats had caused the needle valve to stay open, filling the motor with gasoline. Remember, the Apache’s fuel tank sits high, inside the cab. I pulled a spark plug and found that, sure enough, the engine was locked up because the cylinders were full of premium unleaded.

So, I removed the rest of the spark plugs and cranked over the engine, pumping the gas out of the cylinders. I’m not sure if the idea of getting started with the engine rebuild came before or after the fireball. I do know the fireball looked impressive from the driver’s seat. And Russel’s response time with the fire extinguisher was also impressive. These events provided the final impetus to get going on the rebuild, and the final nail in the coffin for the Q-jet.

p.s.:  DO remember to disconnect coil wire next time.

Fire extinguisher should be a fixture in every shop
Good idea to have two or three of these around.

I visited a couple of local machine shops specializing in engine rebuilding and estimated that I could expect to pay at least $1200 for a complete rebuild. I trusted both of these shops and knew they would deliver a solid value, and it was tempting to just load the engine into the pickup and get it back a week later ready to install.

Instead, we decided to save some bucks and have a go at the rebuild ourselves… something Russel and I had always looked forward to doing. Tallying the bills after we finished showed we spent a little less than $500 on the rebuild plus another $290 (which would have been added to the professional build, as well) for a used Edelbrock carburetor and manifold. Check out the engine rebuild article for details.

1959 Chevrolet Apache: 350 Engine Rebuild

Hoisting 350 engine from 1959 Chevy truck
The old boat anchor is hoisted.

First order of business:  pulling the engine. With a chain hoist strapped to the cross beam of our lift, and after first removing the Saginaw transmission, it wasn’t difficult to remove the engine without assistance.

1959 Apache engine on table for flywheel removal
Pause for flywheel removal.

 

After the engine block was stripped, the expansion plugs were removed, along with the oil gallery plugs. The only problematic ones were the three threaded oil gallery plugs at the back of the block. With these we applied penetrating oil, heat, a long breaker bar, and brute strength. In one case we needed to drill through the plug and use a bolt extractor, taking care not to damage the threads in the block.

350 engine stripped down during rebuild
The tear down.

Brushes, scrapers, a pressure washer, and compressed air were used to thoroughly clean every nook and cranny of the block. This engine ran hot, and after seeing how much rusty, flaky, corroded metal we blew out of the water jackets, it was no surprise. We cleaned up every hole that was going to have a bolt threaded in, used scrapers and scouring pads on all sealing surfaces, used brushes and air in all the oil passages, and followed with more pressure washing. WD-40 was used to prevent the cylinders and bearing journals from rusting.

350 Chevrolet engine, cleaning the oil passages
Clean everything… three times!

After the tedious job of measuring the cylinder bores at the bottom, middle, and top in two perpendicular directions (with a telescoping gauge and caliper), we were satisfied that we could just hone the cylinders and install new rings on the old pistons. Most of the clean up was done with a 240 grit rigid hone, but to produce a better cross-hatch we switched to a flex-hone to finish the cylinders. A final wash with water and a cylinder brush, followed by another coat of WD-40, and the cylinder work was checked off.

Cleaning 350 Chevrolet engine water jackets
Our junior mechanic, Tommy, blowing out the water jackets.

The crankshaft journals were cleaned up with 2000 grit sandpaper, cut into strips. We used our telescoping gauge, caliper, and micrometer to determine which bearing shells to order. Then we picked up some plastigage at the parts store, and installed the caps to the recommended torque to confirm that our new (standard size) main bearings and rod bearings were within spec.

We had purchased a $32 camshaft bearing tool  and used it to remove the old and install the new cam bearings. Then we slid the new 1103 camshaft from Summit Racing (slightly more aggressive than the stock camshaft), new lifters, pushrods, rocker arms, gaskets, and valve covers. We decided to put the 487 heads on the shelf for future fun (porting practice), and instead used the 624 heads that we had in the barn. These particular heads have smaller combustion chambers (58 cc versus 76 cc) and valves, but the main motivation was that they were ready to install.

bottom end view of 350 engine during rebuild
Bottom end coming together.

We felt the reduced valve sizes didn’t matter with this truck, since we weren’t going racing with it and didn’t care about power up high in the rpm range. We do like torque. The combination of the 1103 camshaft, the increase in compression ratio, the Edelbrock 1406 carburetor on a Performer manifold, plus new rings sealing the pistons in our freshly honed cylinders resulted in a very nice motor for the Apache.

The rebuild included a new oil pump, fuel pump, water pump, oil pan, spark plugs and wires, harmonic balancer, timing chain set, timing chain cover, and gaskets. We purchased an HEI distributor, but then decided we didn’t want to tear up the carpet and tunnel to accommodate the bigger cap. We stuck with our Pertronix setup and an external coil.

1959 Chevrolet Apache 350 V8 engine on stand after rebuild
Nearly there.

Excluding the Edelbrock carb and manifold, which cost us $290, the rebuild came to just under $500. Based on the estimate of $1200 for a professional rebuild – by a trusted machine shop – it amounted to quite a saving. Plus, we really wanted to rebuild an engine ourselves… the Apache was the perfect opportunity.

Rebuilt 350 engine re-installed in 1959 Apache truck
Home again.