W126

Did my old 82 300SD jump a tooth?

she drove as normal as you can expect for a 82 300sd that has been run hard and put up wet 300,000 + miles as odometer quit years ago. the 617 had alot of blowby and oil leaks [crankcase press] being the faithfull old girl she was she made it home and wouldnt fire next morning.checked compression below par, less then 300 psi in all 5 holes spining her with 24 volts my questions are #1 how does one check inj.

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