Thanks for the replies, everyone! The valve clearances, the vacuum pump and compression all check out. I think it'll be time for me to check the fuel pump drive gear. I checked in my workshop manual, and there's nothing at all mentioned for this procedure. I'd like to do as much inspecting...

My 2.5 N/A is making a noise that I haven't been able to troubleshoot. Thanks in advance for any help... - The engine is relatively new (less than 3,000 miles but a little over 1 year old, so unfortunately out of warranty). It ran well without any abnormal noises for the first few thousand...

Thanks! That website had exactly what I was looking for!

Does anyone know of a good site on the web to find a roll bar for a Defender 90 that's high enough to be practical when the roof is off but fits under the stock hard-top? Thanks!