I'm trying to fix up an old 4x4 Sierra Classic (but it doesn't have the 454) but I don't really know where to start. I can't remember it ever being driven (REALLY bad memory) and the fuel gauge says both tanks are full. I know I have to drain the tanks, change the oil, and move the fuel pump, but I know how to do the second two. I kind of know my way around an engine, but the more detail the better.
Thanks for any and all the help.%26039;77 GMC Sierra Classic repair help?
If the vehicle has been sitting for years, you are looking at a lot of work.
1. Before you turn the engine over, remove all the spark plugs %26amp; fill the cylinders with WD 40 or Moovit. Let it sit for at least a week. This will help prevent the ring lands from breaking once the engine is turned.
2. Drop the engine oil to check for coolant. If OK add new oil %26amp; filter
3. Remove the Distributor
4. Place in a long rod (鈪?quot; material) with a flattened end(similar to a flat screwdriver) in a 鈪?quot; electric drill. Use to prime the oil pump (turns clockwise)
5. Switch on the drill until oil pressure is reached (about 30 seconds)
6. Connect a remote starter button to starter
7. Remove the rocker covers
8. Switch on the drill. Turn over the engine with the remote starter. Observe the action of the rocker arms. They should all move a minimum of 陆%26quot; each. If not then the cam may be flat or the lifter is weak. Continue for about a minute. Allow the starter motor to cool off %26amp; repeat. If no improvement then the engine will have to come apart to investigate the cause.
9. Rebuild the carb. It will be full of rotten gas.
10. A complete brake job will be required.
(2) Front Calipers
(2) Rear Wheel Cylinders
(1) Master Cylinder
(2) Rear Axle Seals
To change the fuel pump:
?Remove the fuel lines using line wrenches so you do not strip the fittings
?Remove the two 鈪?quot; bolts on the pump
?Remove the top 鈪?quot; bolt next to the harmonic balancer [front of engine] next to fuel pump.
?Push the fuel pump push rod up until it contacts the cam (should be only about 陆%26quot; exposed.
?Place a longer 鈪?quot; NC bolt in the front of the engine to hold the push rod in place. DO NOT tighten too much or you will bend the push rod.
?Scrape off the old gasket
?Install new fuel pump
?Replace 鈪?quot; bolt in the front of the engine with the original
?Reattach your fuel lines
Good Luck. . . Have fun. . .
禄禄禄%26039;77 GMC Sierra Classic repair help?
On these trucks when you flip the switch for the tanks it moves a valve that switches over the fuel suction line, the return line (if truck had AC), and a switch contact for the gas gauge. On a truck that old the first place I would be looking for a problem would be grounds. There is a ground wire that goes from the frame to a tab on the top of the sending unit (which is also the pickup). There is also a wire that goes from the sending unit to the tank selector valve thing. Most of the time I see that ground wire get all crudded up and come off the top of the tank because its pretty close to where the gap is between the box and cab so you can get leaves and other crud down there to hold in moisture and rust things. While you are working down there it would not be a bad idea to put some new pieces of fuel hose on. The old ones are likely cracked and hard as a rock by now. If the valve does not switch I would also make sure it has a good ground.
