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Old 06-04-2011, 09:03 PM   #1
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Onan 5500 Spark Plugs

Decided to swap out the spark plugs on the genny a few weeks ago, it only had 280 hours on it & the "recommended" interval is 500 hours. All I can say is WOW what a difference in starting & smoothness in running. The original plugs weren't fouled but had plenty of carbon build up on them. Used to take a good 10 seconds or more of cranking for it to start up, now it literally starts within 2 seconds & runs smoother. Now it's been completely serviced top to bottom and runs like top!
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Old 06-11-2011, 05:27 PM   #2
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How encouraging! Thanks for the info...now hubby wants to know if you figured out if this also helped with fuel usage.

michelle
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Old 06-12-2011, 09:40 PM   #3
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How exactly does one measure fuel usage of a genny - particularly when loads vary constantly?
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Old 06-26-2011, 07:58 PM   #4
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How did you get the one on the right side out? I got the plugs and took a quick look and that one looks to be hard.
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Old 06-27-2011, 12:08 PM   #5
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Quote:
Originally Posted by jaysplace View Post
How did you get the one on the right side out? I got the plugs and took a quick look and that one looks to be hard.
I haven't done mine yet but have been reading how people got to that one and below is what I have saved.
One poster said he had an removable access panel that allowed an easy removal.


"I purchased a telescoping lug wrench that takes 1/2" sockets.
Slight "L" shape with about a two inch bend at the end with
the socket. Used a SHALLOW 13/16's spark plug socket on the
end and was able to break it loose. Worked EASIER on the left
rear one!

On the front right one, I used a 13/16's socket on a T-handle
to break it loose.

After breaking loose, I used my fingers to get them unscrewed
the rest of the way.
What a PITA but it worked!
Be sure to remove the little neoprene insert from the spark
plug socket. I had a devil of a time until I plucked those out
of each socket. Then, she fit like a glove!



************************************************** ****************************************

I hope somebody tells you different, but I had one in a Winnie
that I had to undo the bolts in the back and jack it up to
raise the side up so I could reach in far enough. Luckily I
had a lot of height in the cabinet. It was still tight but
doable.
************************************************** ********************************88
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Old 06-27-2011, 10:01 PM   #6
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Quote:
Originally Posted by jaysplace View Post
How did you get the one on the right side out? I got the plugs and took a quick look and that one looks to be hard.
a universal joint & short extension but used very small turns on the ratchet until it was loose & then unscrewed it by hand...just have to be very careful
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Old 11-09-2019, 04:06 PM   #7
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I used a 1/4" ratchet with a 1/4" to 3/8" adaptor and a 13/16" spark plug socket without the rubber insert. In and out with minimal effort. Used a long screwdriver to pop the plug wire off after a little twisting to break the seal. Used anti-seize on the threads and die-electric grease in the plug wire boots.
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Old 11-09-2019, 07:50 PM   #8
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I removed the valve cover as I adjusted the valve lash at the same time. Made it much easier.
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Old 11-09-2019, 08:30 PM   #9
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If you had a lot of carbon on the plugs can you lean the fuel mixture a little bit?
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Old 11-09-2019, 08:50 PM   #10
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You could also run some Seafoam and help clean it up inside.
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Old 11-10-2019, 06:38 AM   #11
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I always drain a little oil prior to changing and replace with an ounce or two of seafoam. Run it for a minute or two while seafoam spraying the air intake.

Remembering to move the altitude mixture adjust lever as you travel will also help with carbon buildup.
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Old 11-14-2019, 08:49 PM   #12
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Just .02 cents worth free advice so take it for what its worth. Always, always use Onan spark plugs. There have been so many running and shutting down issues with non Onan plugs that the first thing now replaced is the spark plugs then troubleshooting from there.
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Old 11-21-2019, 06:06 AM   #13
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Quote:
Originally Posted by randomledder View Post
Just .02 cents worth free advice so take it for what its worth. Always, always use Onan spark plugs. There have been so many running and shutting down issues with non Onan plugs that the first thing now replaced is the spark plugs then troubleshooting from there.
The Onan spark plugs are NKG's packaged in an Onan box.
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Old 11-21-2019, 01:33 PM   #14
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Ok. Never mind.
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