I don't know if the 802/803's are vulnerable to potential "glow plug tip expansion" over time due to normal usage. The MEP-002a/-003a GP tips can potentially swell enough preventing them from exiting the threaded hole they are screwed into as well as rusting so badly in place they strip threads or break off trying to remove them after its too late. Several MEP-002a/-003a owners have reported that as being a sporadic problem on older units and they recommend they be replaced every few years and using copper anti-seize compound on them. So I now think of it as preventative maintenance every couple of years to remove & inspect them and reuse if good, or replace with new, and install with copper anti-seize compound.
After being made aware of this inspection tip, it just so happens I found a great "Rock Auto" deal on GP's for $5 each and stocked up on a few. Had to source & buy the copper washers separately though.
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