Issues
This engine can suffer from unreliability as a result of the following design problems:
- Overly long single link chains with poor automatic tensioning that only last about 25,000 miles (40,200 km). The damage is extensive if they fail;
- Inadequately sized main bearings - these have short lives as a result;
- The aluminium heads warp due to poor castings which restrict coolant flow, leading to overheating;
- Water pump failures relating to the drive gear shearing.
- As a legacy of the V8's beginnings as a straight-4 design the sender unit for the temperature gauge is located in one cylinder head (rather than a point of the cooling system common to both heads as on other multi-bank engines). This means that problems can go undetected in one head until enough damage and/or overheating has occurred to affect the one fitted with the sender unit.
Many modern day upgrades and sticking to the manufacturers recommended service schedules help to solve these problems. An air dam for a TR-6 helps solve a cooling problem by scooping up the air in front of the car. A 12 blade fan helps to pull more air though the radiator.
Read more about this topic: Triumph V8
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