mx5cartalk.com

So I ran to the toilet today with my car still on and my gf in it and I find that one of the headlights it blown Not the high beam though YAY!

Now, as far as replacing, I'm under the impression these are sealed units, that if its blown I need a new headlight???

Pretty sure a NA8 has H4 globes - I know both of mine do.

Baldas is right. Gotta undo the plastic shield then the ring with the three screws, pop the headlight out, undo clip and take out globe. I did it in about 15mins for both. Have Fun

O cool. I've taken out the semicircular reflector before so thats fine. I just had a vague recollection that it was a completely sealed unit..*phew*

if it were a sealed beam ( sbu) these are fully sealed and made of glass and replacement is a very simple process. A semi sealed unit comprises a metal reflector and a glass lense glued to it with a replaceable bulb ( QH)- these units are commonly known as inserts. The latter set up can tend to deteriorate quicker than a sbu simply because they are sealed with a boot which breathes - an sbu is fully sealed. A semi sealed unit of good manufacture has better light performance than an sbu and an sbu is in most instances is not QH. I know sbu's were fitted to MX5's certainly for USA but not sure if Au got the same spec.

my NA8 has H4 globes, 15 min to replace-easy.

yup =D Did it today, took about 10 minutes. Crisis averted I just had the assumption a Sealed Beam Unit was like ALL sealed and you needed to get a new unit, which I thought was utterly stupid :S