1. Remove bolt (11mm) that attaches steering gearbox from lower steering column shaft 2. Slide lower steering column shaft until it detaches from steering box spline 3. Remove wheel 4. Remove steering box bolts attached to frame, inside of wheelwell and slightly lower it without removing any lines 5. Simple grab a hold of the lower steering column shaft a slide downwards until it detaches from upper shaft section (the lower steering column shaft is a press fit, two piece design) 6. Remove the water temperature sender and spark plugs from head. This will give you the additional clearance to lower the exhaust manifold into place from the top.
The exhaust manifold needs to have a gasket in place to help seal the juncture between the manifold and the engine. After the gasket and gasket sealer are in place, tighten the bolts for the exhaust manifold. The exhaust pipe can then be replaced on the new exhaust manifold.
You will need to remove the exhaust manifold retaining bolts in your 1993 Chevy Astro. Remove the exhaust manifold. Remove the exhaust manifold gasket and clean the surface. Reverse the process to install the new exhaust manifold gasket.
The block heater is located on the driver's side underneath the exhaust manifold. A dealer will offer it as an installed option or you can purchase and install it later.
40 lbs
Exhaust Manifold Removal & Installation 4.6L, 5.4L and 6.8L Engines 1. Raise and safely support the vehicle. 2. Remove the front fender splash shield. 3. For the left-hand exhaust manifold, remove the EGR valve-to-exhaust manifold tube and disconnect the Differential Pressure Feedback Exhaust [DPFE] gas recirculation transducer hoses. 4. Remove the oil stick from the engine. 5. On the 4.6L and 5.4L engines, remove the catalytic converter-to-exhaust manifold bolts. On the 6.8L engine, remove the front exhaust pipe from the manifold. 6. Remove the exhaust manifold mounting nuts, then remove the exhaust manifold itself. 7. Remove and discard the old gasket. 8. Clean and inspect the exhaust manifold for damage. To install: 9. Position a new gasket and the exhaust manifold onto the engine block. 10. Install the mounting nuts and tighten, in the sequence shown, to 13-16 ft.lbs. [18-22 Nm] on the 4.6L and 5.4L engines. Tighten the nuts to 17-20 ft.lbs. [23-27 Nm] on the 6.8L engine. {Tighten the passenger side exhaust manifold bolts in the order shown-4.6L and 5.4L engines} Kriss x kross 11. On the 6.8L engine, tighten the exhaust manifold-to-front pipe fasteners to 27-34 ft.lbs. [34-46 Nm]. 12. On the 4.6L and 5.4L engines, attach the catalytic converter to the exhaust manifold, then install the catalytic converter-to-exhaust manifold bolts and tighten to 25-34 ft. lbs. [34-46 Nm]. 13. Install the oil stick. 14. For the left-hand exhaust manifold, install the PDFE transducer hoses if equipped, and EGR-to-exhaust manifold tube. Tighten the upper and lower fitting to 26-33 lbs. [35-45 Nm]. 15. Install the front fender splash shield. 16. Lower the vehicle to the ground.
What engine???????? You should refer to repair manual if not familiar with auto repair and understand the terminology before attempting Remove nuts holding exhaust manifold to cylinder head & remove nuts/bolts holding exhaust manifold to exhaust pipes Use new exhaust manifold gaskets and install the new manifold securing the manifold to cylinder head (may need to but new nuts and or bolts) by "snugly" tightening manifold to cylinder head if not refering to repair manual
Exhaust Manifold Removal & Installation 4.6L, 5.4L and 6.8L Engines 1. Raise and safely support the vehicle. 2. Remove the front fender splash shield. 3. For the left-hand exhaust manifold, remove the EGR valve-to-exhaust manifold tube and disconnect the Differential Pressure Feedback Exhaust [DPFE] gas recirculation transducer hoses. 4. Remove the oil stick from the engine. 5. On the 4.6L and 5.4L engines, remove the catalytic converter-to-exhaust manifold bolts. On the 6.8L engine, remove the front exhaust pipe from the manifold. 6. Remove the exhaust manifold mounting nuts, then remove the exhaust manifold itself. 7. Remove and discard the old gasket. 8. Clean and inspect the exhaust manifold for damage. To install: 9. Position a new gasket and the exhaust manifold onto the engine block. 10. Install the mounting nuts and tighten, in the sequence shown, to 13-16 ft.lbs. [18-22 Nm] on the 4.6L and 5.4L engines. Tighten the nuts to 17-20 ft.lbs. [23-27 Nm] on the 6.8L engine. {Tighten the passenger side exhaust manifold bolts in the order shown-4.6L and 5.4L engines} Kriss x kross 11. On the 6.8L engine, tighten the exhaust manifold-to-front pipe fasteners to 27-34 ft.lbs. [34-46 Nm]. 12. On the 4.6L and 5.4L engines, attach the catalytic converter to the exhaust manifold, then install the catalytic converter-to-exhaust manifold bolts and tighten to 25-34 ft. lbs. [34-46 Nm]. 13. Install the oil stick. 14. For the left-hand exhaust manifold, install the PDFE transducer hoses if equipped, and EGR-to-exhaust manifold tube. Tighten the upper and lower fitting to 26-33 lbs. [35-45 Nm]. 15. Install the front fender splash shield. 16. Lower the vehicle to the ground.
The old exhaust manifold will need to be removed. The new headers will either have to be made to fit the engine well, or the inner fenders will have to be modified to fit. Then the headers will need to be either mated to the old exhaust or a new exhaust system will need to be installed. In a v8 engine installation most people prefer a dual exhaust to maximize the headers capability.
install sound drivers
Most oxygen sensors are located on the exhaust manifold or just after the manifold on the exhaust pipe(s). Your truck probably has two oxygen sensors, one on each side.
you will have to unbolt the exhaust pipe from the manifold pipe and then you unbolt the manifold pipe from the engine, remove old gasket and make sure both sides are clean of the old gasket and then install new gasket and bolt manifold back onto engine.
Follow the manual (Haynes, Chilton, Ford Factory). After the old manifold is off, clean the mating surfaces. Install a new gasket (no cement). Bolt on the new manifold. Tighten the bolts and nuts to the torque specs in the manual following the procedure in the manual. Bolt it to the exhaust pipe (new gasket also).