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Author Topic:   Spark Plugs in a Ficht
Buzzorouter posted 02-09-2004 12:21 PM ET (US)   Profile for Buzzorouter   Send Email to Buzzorouter  
Buddy of mine has a 150 HP Evinrude Ficht. Kind of late but he asked me to winterize it for him. When I pulled the plugs to fog the cylinders, the spark plugs were marked with a magic marker along their length. The mark was on the opposite side from the metal tang that the spark jumps to from the electrode. Can any body tell me why they are marked? My buddy said that the plugs had to go back in just the way they came out and the mark had to be in a certain spot. I will be changing the plugs in the spring. I want to put them in right.
Peter posted 02-09-2004 12:37 PM ET (US)     Profile for Peter  Send Email to Peter     
The mark is for indexing the plug. The plugs need to be installed so that the tang is not blocking the spark in the direction of the fuel injection. The normal procedure is to draw a line on the opposite side of the tang and then install and tighten the plug to the point where the line is within 90 degrees, either side of a line drawn between the injector and the sparkplug.
Sal DiMercurio posted 02-19-2004 11:58 PM ET (US)     Profile for Sal DiMercurio  Send Email to Sal DiMercurio     
Peter, he may not understand tang.
The open end of the tang is where you gap the plug, [ .030 , but really sure be .028 for FICHT engines ].
The open end "CAN NOT " face straight away from the injector, best results are facing directly or very near towards the injector.
Another tip, mark the plug socket and insert the plug into the socket so the marks are in the same place so you don't have to keep pulling the socket off the plug to see the mark.
If a plug wont line up towards the injector, put it on the other side of the engine [ opposite head ]& be sure to torque the plugs to specs but don't strip the head or you will cry for a long time because their "EXPENSIVE".

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