Main Menu
Newest Members
Wild Edibles, harry pham, bullet man, Logo, LLCC
102336 Registered Users
Top Posters
TexDawg 82180
hopalong 73426
Pilothawk 72822
JDavis7873® 67375
FattyMcButterpants 60428
John175 ® 59617
Tritonman 56538
Derek 56121
SkeeterRonnie 52395
LoneStarSon® 51982
Forum Stats
102336 Members
60 Forums
853393 Topics
11192314 Posts

Max Online: 36273 @ 01/23/13 02:34 PM
Topic Options
#11688474 - 06/25/16 02:13 PM Cross Threaded Spark Plug Hole
Ol Man River Offline
Extreme Angler

Registered: 06/16/11
Posts: 1203
Loc: Orange, Texas
Well, it finally happened to me....the dreaded cross thread. I removed my Mercury plugs to inspect and clean and upon reinstallation, I had an issue with the last plug. I started it by hand like all the others and it went in smooth. Once I started easing it on in with plug socket, it went ok for a few rounds and then just stopped. I bought a thread chaser at local Auto Zone and used my ratchet driver to ease in and clean up threads. I did apply grease to the thread chaser to collect any metal shavings. The spark plug went in just fine afterwards. Not sure if it was carbon in thread grooves when I removed the plug or what but all is good now.

#11688821 - 06/25/16 07:49 PM Re: Cross Threaded Spark Plug Hole [Re: Ol Man River]
machinist Offline
Extreme Angler

Registered: 08/22/06
Posts: 1639
Loc: Lake Graham, Lot 30
You probably didn't cross thread the plug. It probably tried to seize up because of either carbon in the threads or maybe the dissimilar metals. I worked for VW for several years and we had the same problem nearly every day. Lots of time we couldn't get the plugs out because they were put in dry. You need some kind of anti-seize on the plug threads. You can get Fel-pro anti-seize at most auto parts stores and it works great. In a pinch graphite will work also. Just remember Aluminum and steel don't always mix and Aluminum always loses.

I fish on the edge and stay out of the middle

99 BassCat Jag w/225 Merc Optimax


© 1998-2016 OUTDOOR SITES NETWORK all rights reserved USA and Worldwide