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Both our 617A and 603A start fine on B100 at 5 dF, with no block heater. You probably need a valve adjustment if the glow system checks out OK.
On the early relays, like yours, if all five plugs burn out, the light illuminates fine.
You likely recall that B100 has a flash point of about 125 dC (257 dF), while D2 is around 25 dC (75 dF). The B100 is no where near as "burny" as is pump fuel, so you need some solid source of combustion: cranking speed and/or good valves and/or good glows.
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James Marriott
2003 Buick Regal
1983 300D (228k, frau Auto)
1996 Suburban K2500 (192k, 6.5 turbo diesel/4WD towmaster 10,000)
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1987 300SDL junker 170k
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