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What is the idle rpm when it's rough?
How are you checking IP timing? I don't know the actual start of delivery spec but the position of the crank pulley when the governor lug is visible through the inspection port is 14-15 ATDC.
How are you checking compression? My manual says the max is 465psi.
And a question to ask of anyone working on a 603, does the cooling system remain pressurized after you shut off the engine? Even hours after you shut off the engine?
Sixto
91 300SE
87 300SDL
83 300SD
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