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Hi, Josh!
Sorry to be late getting back to you. The Hall sensor lives under the dust cap under the rotor inside the distributor. I'm not sure what the lifespan is, but after this died on me this summer, I posted a 'life expentency' question to the 'Board -- I was thinking, is this something I should carry around in my spares box? I was advised that it isn't worth the trouble, they're hard to predict.
I gather that the design has changed over the years. My Hall sensor in my my '83 LH2.0 B23 was an easy out/easy in replacement. At some point, Volvo changed the distributor -- with the B230 LH2.2? -- and I gather with these base metal distributor bodies, the Hall sensor isn't as easy to replace; furthermore, I've heard horror stories of trying to get these distributors off the block -- apparently dielectric metal corrosion between the base metal distributor and the iron crankcase makes them nearly impossible to remove once they 'weld' themselves into place. This may be 'urban legend', however. I have no experience myself with this.
Sorry I couldn't be more specific.
Rob
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