- Combustion Leakage
Typical Appearance
Hard blackened face
Surface cracks
Discoloured eyelets
Grooves
Bulges
Cause
Leakage of combustion gases as a result of :
Insufficient clamping load
Rough
- Insufficient Torque
Typical Appearance
Displacement of gasket material
Cracking of bore eyelets
Few or no compression marks on facing
Gasket thickness nearly same as newgasket
Cause
Adding sealant during gasket installation
Head bolt problems
Tightening, damage and dirty threads
Bolt not re-torqued
- Coolant Seepage
Typical appearance
White residue covers water jacket areas
Grooves
Bulges
Cause
Chemical attack from coolant additive ( interior quality gaskets are especially prone to coolant.
- Corrosion
Typical appearance
Disintergration of gasket through to the steel core
Corrosion around the coolant passages
Split jacket eyelets
Brown marks left by corroded
Cause
Coolant not/inadequately treated with corrosion inhibitor(especially with aluminium heads)
- Detonation/ Pre-Ignition
Typical appearance
Gasket material burned away between bores/problem areas
Discoloured eyelets
Combustion leakage parts
Cause
High compression ratio
Advanced ignition settings
Wrong fuel/air ratio
Octane ratio too low
Cause (Pre Ignition)
Octane rating too low
Hot spot in combustion chamber
Wrong spark plug heat range
Incorrect camshaft timing
Insufficient cooling system causing localised overheating
- Split Bore Culot Rings
Typical Appearance
Displacement of gasket material
Cracked bore eyelets
Hard blackened face with cracks, etc.
Vagspeccentre Menlyn has all the dealer equipment to make sure that your engine is in tip top condition when it leaves the workshop.
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