Scarab 2014 - 195 - How difficult to change spark plugs

[Delawarejim]

I have a 2014 Scarab 195 - good condition, low hours (120). How hard is it to change the spark plugs?
Thanks in advance,
Jim

 

[Luc Lafreniere]

One of the easiest jobs there is on this boat.

1. Buy replacement sparkplugs NGK DCPR8E (4339). The 4339 represents the version that has a silver terminal (not dark) which means you can unscrew the terminal and remove it. A pair of pliers usually helps to unscrew it. The terminals are disposable for our engines and need to be removed before installing.
2. Unplug the ignition coils and pull/wiggle the ignition coils off the plugs. They are just seated snuggly. No threads. (This assumes you've removed the plastic cover over the engine first).
3. Use a 5/8" spark plug socket with an extension. Spark plug sockets are NOT standard sockets. Unscrew the spark plugs and pull them out. If your socket doesn't grip the plugs, you can use an ignition coil and push it on which will grip the spark plug and then pull it out.
4. Reinstall the new plugs WITHOUT a ratchet. Just by hand. Turn the plug lightly until it stops. THEN use a ratchet and turn it 1/4 turn, no more, no less. If you have a torque wrench, the torque is 13 lbf-ft or 18Nm.
5. Push the ignition coils back on by wiggling them on. Make sure they're well seated. Then make sure the rubber cups are well sealed with dielectric grease to prevent water from getting in.

Note that when the plugs are pulled out, it's important to be careful not to drop any debris into the holes. If you do, they can then score the piston walls. Many use compressed air to remove any particles before working and then put a clean towel over the holes as you work.

If this seems complicated, hire someone please.

 

[Sidarousmg]

I will add, you may need a "skinny" low profile spark plug socket. if you have the correct size socket, but it's not gripping the spark plug, it could be because the regular automotive socket is too thick to fit between the plugs and the chamber. you can find these at just about any auto parts store.