"What are the most common problems with the 1971 MG B Roadster's engine?"

Question

Accepted Answer

The 1971 MG B Roadster's 1.8L four-cylinder engine has several well-known issues that enthusiasts commonly encounter:

**Most Common Engine Problems:**

1. **Fuel Pump Issues** - The original mechanical fuel pumps are notorious for being noisy and unreliable. Your listing already mentions a "loud non-original fuel pump fitted," which is a very common modification owners make to address this problem.

2. **Overheating** - MGB engines are prone to cooling system problems. Common causes include:
   - Radiator blockages or inadequate cooling capacity
   - Water pump failures (often noted by small leaks)
   - Thermostat sticking closed
   - Electric fan issues

3. **Oil Leaks and Burning** - These engines are famous for oil consumption and leaks:
   - Worn valve seals causing oil burning
   - Piston ring wear leading to oil consumption
   - Various gasket and seal failures

4. **SU Carburetor Problems** - The twin SU carburetors can be troublesome:
   - Float bowl fuel level issues
   - Needle and jet wear
   - Difficulty in balancing twin carbs properly
   - Fuel mixture problems causing poor running

5. **Ignition System Issues** - Many running problems trace back to:
   - Points ignition (before electronic conversions)
   - Timing chain wear
   - Distributor problems

The good news is that most of these issues have well-established solutions in the MG community, and parts availability is excellent. The fact that this particular car has already had its fuel pump replaced suggests the previous owner was aware of and addressing these common issues. Would you like me to help you find similar MG B Roadsters, or do you have questions about any specific engine concerns?

Lot 9202: 1971 MG B Roadster

Classic cars

Cars for sale

Resources

Lot 9202: 1971 MG B Roadster

Become a CLASSIC Insider