I got a 07 topkick with 7.8 isuzu need torque specs - Diesel Place : Chevrolet and GMC Diesel Truck Forums
 
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Old 03-15-2017, 01:00 AM   #1 (permalink)
jmcclurg84
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I got a 07 topkick with 7.8 isuzu need torque specs

I am looking for torque specs for this truck I am working on. need rockershaft bolt torque. the end camshaft bearing cap nut torque and bolt that holds the caps on the rockershaft torque.

also need a valve set procedure and clearances.

can anyone point me in the right direction for a manual, or online resource and able to look up the specs?

thanks

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Old 03-15-2017, 06:01 PM   #2 (permalink)
ssbrewskyaz
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There's an attachment with photos. If I recall correctly, the 7.8 is a net lash engine, in other words, bolt the rocker shaft down and put the valve cover on. This engine belongs to Isuzu unlike the 6.6 that belongs to Duramax Ltd a division of General Motors.

Valve Rocker Arm Cover Replacement (w/CTF)
Removal Procedure
1. Remove the engine cover. Refer to Engine Cover Replacement.
2. Disconnect the negative battery cable. Refer to Battery Negative Cable Disconnection and Connection.
3. Remove the exhaust gas recirculation (EGR) pipe from the EGR adapter and the reservoir. Refer Exhaust Gas Recirculation Pipe Replacement.
4. Remove the power steering pipe clamp nuts and clamps at the valve rocker cover and the intake manifold.
5. Reposition the power steering hoses.
6. Remove the vent hose from the valve rocker cover and retainer.
7. Clean the area around the valve rocker cover to the head cover mating surface.

8. Remove the valve rocker arm cover bolts.
9. Remove the valve rocker arm cover and gasket.
Installation Procedure
1. Install the valve rocker arm cover and gasket.

Notice: Refer to Fastener Notice.
2. Install the valve rocker arm cover bolts.
Tighten
Tighten the valve rocker arm cover bolts to 13 Y (113 lb in).
3. Install the vent hose to the valve rocker cover and retainer.
4. Install the EGR pipe to the EGR adapter and the reservoir. Refer Exhaust Gas Recirculation Pipe Replacement.
5. Reposition the power steering hoses.
6. Install the power steering hose clamps and fasteners to the valve rocker cover and the intake manifold.
7. Connect the negative battery cable. Refer to Battery Negative Cable Disconnection and Connection.
8. Install the engine cover. Refer to Engine Cover Replacement.

2007 Chevrolet Kodiak C-Series (Conventional) C6/C7/C8 | Kodiak, TopKick C-Series Service Manual | Engine | Engine Mechanical - 7.8L | Repair Instructions - On Vehicle | Document ID: 1486677
________________________________________
Valve Rocker Arm and Shaft Assembly Removal
Removal Procedure
1. Disconnect the negative battery cable. Refer to Battery Negative Cable Disconnection and Connection.
2. Remove the air inlet pipes. Refer to Charge Air Cooler Inlet Pipe and Outlet Pipe Replacement.
3. Remove the valve rocker arm cover. Refer to Valve Rocker Arm Cover Replacement.
4. Remove the fuel injector harness assembly.

5. Loosen all the valve adjusters, but do not remove.
6. Loosen the valve rocker arm shaft bracket bolts evenly, starting from the outer bolts moving to the inner bolts.
Important: Do not remove the rocker arm shaft bolts from the valve rocker arm shaft assembly until the assembly is removed from the vehicle. Place on a work bench before disassembling.
7. Remove the valve rocker arm shaft assembly.
8. Remove the valve rocker arm retaining bolt.
9. Remove the valve rocker arm.
Installation Procedure


1. Install the valve rocker arm on the valve rocker arm shaft.
Notice: Refer to Fastener Notice.
2. Install the valve rocker arm retaining bolt.
Tighten
Tighten the valve rocker arm retaining bolt to 27 Y (20 lb ft).
3. Install the valve rocker arm shaft assembly to the cylinder head.
Tighten
Tighten the valve rocker arm shaft bracket bolts to:
o M8 bolts to 27.5 Y (20 lb ft)
o M10 bolts to 56 Y (41 lb ft)
4. Adjust the valve rocker arms. Refer to Valve Adjustment.
5. Install the fuel injector harness.
6. Install the fuel injector harness bolts.
Tighten
Tighten the fuel injector harness bolts to 21 Y (16 lb ft).
7. Install the valve rocker arm cover. Refer to Valve Rocker Arm Cover Replacement.
8. Install the intake air ducts. Refer to Charge Air Cooler Inlet Pipe and Outlet Pipe Replacement.
9. Install the negative battery cable. Refer to Battery Negative Cable Disconnection and Connection.

Camshaft Replacement
Tools Required
J 22888-D Side Bearing Remover Kit
Removal Procedure
1. Disconnect the negative battery cable. Refer to Battery Negative Cable Disconnection and Connection.
2. Remove the glow plugs. Refer to Glow Plug Replacement.
3. Remove the valve rocker arm cover. Refer to Valve Rocker Arm Cover Replacement.
4. Rotate the engine to top dead center and align the timing marks on the camshaft.
5. Remove the fuel injector harness assembly.
Important: Do not remove the rocker arm shaft bracket bolts from the valve rocker arm shaft assembly.
6. Remove the valve rocker arm shaft assembly. Refer to Valve Rocker Arm and Shaft Assembly Removal.


7. Loosen the camshaft main bearing caps evenly starting from the outer nut moving to the inner nut.
8. Remove the camshaft assembly with the gear.
9. Using the J 22888-D on the gear, remove the camshaft gear.
Important: If the camshaft and the gear are to be reused, inspect the camshaft for excessive wear and the camshaft gear for chipped or broken teeth.
10. Measure the lobes and bearing surfaces of the camshaft for excessive wear.
Installation Procedure


Notice: Refer to Fastener Notice.
1. Install the camshaft gear bolt and gear to the camshaft.
Tighten
Tighten the camshaft gear bolt to 142 Y (105 lb ft).


2. Install the camshaft, bearing caps and bolts to the cylinder head.
Tighten
Tighten the camshaft bearing cap bolts to 27 Y (20 lb ft).
3. Install the valve rocker arm shaft assembly. Refer to Valve Rocker Arm and Shaft Installation.
4. Install the valve rocker arm cover. Refer to Valve Rocker Arm Cover Replacement.
5. Install the fuel injector harness assembly.
6. Install the glow plugs. Refer to Glow Plug Replacement.
7. Connect the negative battery cable. Refer to Battery Negative Cable Disconnection and Connection.
8. Lower the vehicle.

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Old 03-15-2017, 06:02 PM   #3 (permalink)
ssbrewskyaz
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Sorry, forgot the attachment. ...
Attached Files
File Type: docx 7.8 Isuzu - Valve Rocker Arm Cover Replacement.docx (86.2 KB, 15 views)
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Old 03-15-2017, 06:07 PM   #4 (permalink)
ssbrewskyaz
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I Stand Corrected

Valve Adjustment
Rotate the engine so that the timing marks on the front cover and the crankshaft pulley are aligned. Number 1 cylinder should be at top dead center (TDC).

Before adjusting the valve clearance, loosen the adjustment screw both on the rocker arm and the valve bridge.

Important: Adjust the intake valves on cylinders 1, 2, and 4.
Adjust the exhaust valves on cylinders 1, 3, and 5.
Adjust all the valve clearances to 0.4 mm (0.016 in).
Insert a feeler gauge between the rocker arm and the cap of the valve bridge, and adjust by turning the adjusting screw on the rocker arm, until there is a slight drag on the feeler gauge.
Tighten the lock nut securely.
With a feeler gauge inserted, screw in the adjusting screw on the bridge gradually, until it touches the end of the valve stem, then ensure that the movement of the feeler gauge becomes hard.
Notice: Refer to Fastener Notice.
In this condition, the opposite end of the bridge is raised. Readjust by loosening the adjusting screw on the bridge, until there is a slight drag on the feeler gauge, then tighten the lock nut securely.
Tighten
Tighten the adjusting lock nut to 22 Y (16 lb ft).
Rotate the engine one full turn so that the timing marks on the crankshaft balancer and the front cover are in alignment again.
Important: Adjust the intake valves on cylinders 3, 5, and 6.
Adjust the exhaust valves on cylinders 2, 4, and 6.
Adjust all the valve clearances to 0.4 mm (0.016 in).
Insert a feeler gauge between the rocker arm and the cap of the valve bridge, then adjust by turning the adjusting screw on the rocker arm, until there is a slight drag on the feeler gauge.
Tighten the lock nut securely.
With a feeler gauge inserted, screw in the adjusting screw on the bridge gradually, until it touches the end of the valve stem, then make sure that the movement of the feeler gauge becomes hard.
In this condition, the opposite end of the bridge is raised. Readjust by loosening the adjusting screw on the bridge, until there is a slight drag on the feeler gauge, then tighten the lock nut securely.
Tighten
Tighten the adjusting lock nut to 22 Y (16 lb ft).
Recheck all the valve clearances and readjust if necessary.
Attached Files
File Type: docx 7.8 Valve Adjustment.docx (158.2 KB, 4 views)
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