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Old 15 September 2009, 19:20   #1
Country: New Zealand
Town: Tauranga
Boat name: Extra Pleasure
Make: Atomix
Length: 5m +
Engine: Outboard 60HP 2Strke
Join Date: Aug 2009
Posts: 182
Spark Plugs - Washer


I'm replacing the spark plugs in my Mercury 60HP 2 Stroke.

I'm replacing like for like/the recommended plug:


However, the plugs in the outboard which I'm replacing DO NOT have washers.

The new one's i've just purchases DO have washers.

Do I simply use the washer ones, but adjust the amount of turn after finger tight (1/16 no washer, 1/4 with washer).

Or do I need to take the plugs back and get non washer versions?

Cheers in advance

rjbathgate is offline   Reply With Quote
Old 16 September 2009, 01:18   #2
Country: UK - England
Town: bicester
Length: no boat
Engine: outboard only
Join Date: Feb 2009
Posts: 852
just take them out of the package make sure the gap is correct (1mm or 40thou) put them into your powerhead and torque to 20lbs/ft

uncle al is offline   Reply With Quote
Old 16 September 2009, 21:47   #3
Country: USA
Town: Oakland CA
Length: 3m +
Join Date: Feb 2005
Posts: 6,620
The washers are soft copper or aluminum, designed to crush and seal the plug into the head. You *do* need them.

Assuming you've got the correct plugs for the motor, not having the washers may allow the plug to extend too deep in the chamber, and in the worst case may hit the cylinder as it comes up.

jyasaki is offline   Reply With Quote
Old 17 September 2009, 11:21   #4
Country: USA
Town: Seattle
Boat name: Water Dog
Make: Polaris
Length: 4m +
Engine: Yamaha 60hp
Join Date: Apr 2007
Posts: 1,152
Double check the old plugs didn't actually have washers that are stuck down in the hole. The plug would be at the wrong height if you accidentally used the old plus a new washer.
captnjack is offline   Reply With Quote

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