Subaru XT 1988 Service Manual page 205

ENGINE
2-3
TROUBLE No.
POSSIBLE CAUSE
1 2 3
4 5
6 7
8
9
10 11 12 13
INTAKE SYSTEM
0 0
©
0 0
© 0 0 ©
•
Improper idle adjustment.
0 © © ©
/:,
©
•
Loosened or cracked intake boot.
0
© © ©
/:,
©
•
Loosened or cracked intake duct.
/:,
© © ©
/:,
© ©
•
Loosened or cracked blow-by hose.
/:,
© 0 © ©
0
©
•
Loosened or cracked vacuum hose.
0
0 0 0 0
©
•
Defective intake manifold gasket.
0 0 0 0
0 ©
•
Defective throttle body gasket.
/:,
0 0
0 0 0
•
Defective PCV valve.
0 0 0
/:, 0 /:,
•
Loosened oil filler cap.
/:, /:,
© 0
0
©
•
Dirty air cleaner element.
FUEL LINE
© /:, /:, 0 0
•
Defective fuel pump.
I
/:, /:, /:, 0 0
•
Clogged fuel line.
0 0
0 0 /:, /:,
•
Lack of or insufficient fuel.
BELT
0 0 0
•
Defective.
0 0 0
/:,
0 0
0 0 0
•
Defective timing.
FRICTION
/:,
• Seizure of crankshaft and connecting-rod bearing.
/:,
• Seized camshaft.
/:,
•
Seized or stuck piston and cylinder.
COMPRESSION
/:, /:,
/:,
0 0 0 0
/:, 0
•
Incorrect valve clearance.
/:, /:,
/:,
0 0
/:, /:, /:,
•
Loosened spark plugs or defective gasket.
/:, /:, /:, 0 0
/:, /:, /:,
•
Loosened cylinder head nuts or defective gasket.
£:... £:...
£:...
0 0
£:...
0 0
•
Improper valve seating.
6- /:,
/:, /:, /:, /:,
/:,
©
/:,
•
Defective valve stem.
0 0 0 0 0
£:...
£:... £:...
• Worn or broken valve spring.
£:... £:... £:...
0
£:... £:...
£:...
© 0
• Worn or stuck piston rings, cylinder and piston.
0 0 0 © © © ©
0 0
•
Incorrect valve timing.
0
0 0 0 0 0
•
Improper engine oil (low viscosity).
LUBRICATION SYSTEM
0
0
/:,
£:...
•
Incorrect oil pressure.
0
•
Loosened oi I pump attaching bolts and defective gasket.
0
•
Defective oil filter seal.
0
•
Defective crankshaft oil seal.
/:, 0
•
Defective rocker cover gasket.
0
•
Loosened oil drain plug or defective gasket.
0
•
Loosened oil pan fitting bolts or defective oil pan.
1
2
3 4 5
6 7 8 9 10 11 12 13
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