Critical Engine, BMC B-Series (1,489cc / 1,588cc)
Head Gasket Failure
Symptoms
Coolant loss without visible external leak. White smoke from the exhaust. Milky emulsion under the oil filler cap. Overheating. Bubbles in the header tank.
Cause
The B-series engine uses a cast-iron block and aluminium head, different thermal expansion rates stress the head gasket. Overheating events are the primary cause of failure. Low coolant level, a stuck thermostat, or a failing water pump can all trigger overheating.
Fix
Remove the head, inspect and resurface if warped, replace the gasket.
Check the head for cracks (particularly between valve seats).
Cost: $800-$1,500 at a workshop.
Cost mentioned in fix
Cost: $800-$1,500
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