Jetta III L4-1.9L DSL Turbo (AAZ) (1993)
Piston: Testing and Inspection
RING TO PISTON GROOVE CLEARANCE
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Clean piston ring groove before checking
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New:
1st Compression Ring: 0.06-0.09 (0.0024-0.0036 inch).
2nd Compression Ring: 0.05-0.08 (0.0020-0.0032 inch).
Oil Scraper Ring: 0.03-0.06 (0.0012-0.0024 inch).
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Wear Limit:
1st Compression Ring: 0.25 (0.0098 inch).
2nd Compression Ring: 0.25 (0.0098 inch).
Oil Scraper Ring: 0.15 (0.0059 inch).
PISTON PROTRUSION
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Piston protrusion above TDC must be measured whenever new pistons, rods or a short block is installed.
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Depending upon the piston protrusion above TDC, install the correct gasket using the following table:
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Piston protrusion: 0.91 mm to 1.00 mm
Use gasket with: 1 Holes/notches
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Piston protrusion: 1.01 mm to 1.10 mm
Use gasket with: 2 Holes/notches
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Piston protrusion: 1.11 mm to 1.20 mm
Use gasket with: 3 Holes/notches
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Cylinder head gasket identification:
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Part number = black arrow
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Holes/notches = white arrow
NOTE: If differing results are obtained when measuring piston protrusion, use the largest measurement to select the correct gasket.