GMC Powertrain 4.3 L, Руководство по обслуживанию, Страница: 24 / 196

6-14 Marine/Industrial 4.3L Engine
2000 Marine/Industrial
Check the oil pump screen for damage or a loose fit to the
7
oil pump.
Is the oil pump screen loose or is the oil pump screen
damaged?
— Go to Step 8 Go to Step 9
8
Repair as required.
Is the tapping noise gone? — System OK Go to Step 9
Check for a damaged oil pump or loose bolts.
9 Refer to Oil Pump Clean and Inspect.
Is the oil pump damaged or are the bolts loose? — Go to Step 10 Go to Step 11
10
Repair as required.
Is the tapping noise gone?
— System OK
Go to Step 11
Remove and inspect the valve lifters, the valve rocker
arms and the valve pushrods. Refer to Valve Rocker Arm
11
and Pushrods Clean and Inspect and Valve Lifters and
Guides Clean and Inspect.
Are the components worn or damaged? —
Go to Step 12 Go to Step 13
12
Replace the components as required.
Is the tapping noise gone? — System OK Go to Step 13
Perform an engine camshaft lobe lift test. Refer to
13 Camshaft and Bearings Clean and Inspect.
Is the engine camshaft lobes within specifications?
— Go to Step 15 Go to Step 14
14
Replace the engine camshaft and valve lifters.
Is the tapping noise gone?
— System OK Go to Step 13
Remove the engine front cover and inspect the camshaft
15
timing chain and sprockets for excessive wear or damage.
Refer to
Timing Chain and Sprockets Clean and Inspect.
Are the components worn or damaged? — Go to Step 17 Go to Step 16
16
Replace the components as required.
Is the tapping noise gone?
— System OK Go to Step 17
Perform a complete disassembly of the engine and inspect
17 all components.
Are the components worn or damaged?
— System OK Go to Step 11
Replace the components as required.
18 Did you complete the worn or damaged component
replacement?
— System OK —
Diagnostic Table (cont’d)
Step Action Value(s) Yes No