- They can leak oil or coolant onto the ground, with no internal failure
- The fire ring seal can fail, allowing combustion gases to pressurize the cooling system
|A blown head gasket. Area in the red box is the coolant passage. The half circle is the combustion seal|
|Repaired cylinder heads for a Bentley (c) J E Robison Service|
|A burnt valve as seen in the head (c) J E Robison Service|
|Burnt valve removed from the head (c) J E Robison Service|
|Illustration of a low spot in an aluminum block deck (c) J E Robison Service|
|Measuring cylinders for taper and egging, BMW V8 shown (c) J E Robison Service|
|Repairing damaged head studs with oversize inserts Bentley V8 shown (c) J E Robison Service|
Quality engine work takes time, and costs money. Jobs done correctly last, and the price is soon forgotten while poor quality never goes away.
Also see this related article: Head Gasket Failures in Rolls Royce/Bentley engines
If you're wondering what's below the heads, read this story about liner failures in Land Rover V8's and how we fix them.