1999 Volvo Penta "WT" Models Workshop Manual, Page 45Get this manual
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Tune-up Specifications
5.0 GL10" BTDC w89 AKI or higher 5" BlOCw86-8S AKI
5.0 Gi BTDC wlSS AKI or higher set timing with diagnostic leads shorted 5.7 GS12 BTDC w89 AKI or higher