There were some early Russian and European diesel tractors (without glowplugs) that had a port to insert an explosive charge to assist cold starts while cranking........relatives in europe had one when my dad was growing up.

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FRED

Daily Driver: 98 E300TD 199K
Hobby Car: 69 Austin Mini
Past Diesels: 84 300SD, 312K
87 300SDL, 251K
94 Chev. K-1500 6.5Ltr.TD, 373K