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CHAMPION SPARK PLUG RECOMMENDATIONS
FOR PALMER MARINE ENGINES.

  by Richard A. Day Jr.

All gaps unless otherwise noted are .030"

Engine Model  Plug Type
NK, F, PB, PAL, LH, PH45, PH75, PH120, 7/8" 18 Thd     W-18
PH135, PH150, 18MM with gasket " reach  D-14
PHC 7/8" Heads W-10
SK, GW, LLH, ZR, PNR, PH134, IH60, M60, YT, HH, BHT, D-16
BHW, BH-25  A little hotter heat range than the D-14  D-16
134, 230, 320, 339, 404, 240, 264, 308, 461, V345, V549 D-14
M265                                                                   D-14
M304, M345:  Normal service     UJ-6
M304, M345:  Light service UJ-8
M196, M265, M392, M549, M345B, M392B  UJ-6
PW-27  18mm heads  D-21
PW-27   14mm heads UJ-10Y
Y304, Y345, Y392  UJ-6
P302, P351, UF-9Y
PB-V-215 V-8 Model (Gap .035) L-7
MD188, MD301, MD301SM (Diesel)  AG-40

                  The above information taken from a Champion Spark Plug data sheet published in 1970.  One needs to keep in mind that the very early jump spark engines used " NPT plugs like the Ford, Model T  "X" plug.  Early engines such as the NL, NR, PNR and ZR series used 7/8" plugs such as the W-18.  Later production used 18 MM plugs such as the D-14 or D-16  Things like heat range were never even a consideration in these engines.  The YT series will be found with heads using either 7/8" or 18mm plugs. So use this data with attention to the actual dimension of the threaded hole in the engine.

 

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