I have a DR self propelled trimmer with a Briggs and Stratton motor.
According to instructions, I removed the4 spark plug to put a little oil
in the cylinder for the winter. In putting the plug back in, I cross
threaded it. I got a thread chaser but it was impossible to turns it
properly because of interference from the valve assembly. I think I
made the threads worse. Is there anything I can do short of removing
In the White Mountains of New Hampshire
(44ï¿½ 15' N - Elevation 1580')
On Thu, 27 Oct 2011 08:01:00 -0400, ---MIKE--- wrote:
How thick does the head gasket seem? On a lot of mowers they're reusable,
at least to a certain extent, and the bolts holding the head on aren't
that tight, and getting them all torqued back down to the same level
isn't that critical. Pulling the head, trying to clean the thread up,
then refitting it might not be a big deal at all.
On Oct 27, 8:01 am, firstname.lastname@example.org (---MIKE---) wrote:
It will never be "right" again. Even if you get the threads
straightened out they're compromised and the spark plug will likely
blow out at some point in the near future. Best thing to do is replace
the head at this point, and consider it an expensive lesson learned.
Yes, you could helicoil it to do it properly. Or replace the head. Or
epoxy the plug into the hole and replace the head when the plug wears
(I suspect that most mowers die of something long before the plug needs
On Thu, 27 Oct 2011 08:01:00 -0400, email@example.com
Pull the head, run the thread chaser from the inside to outside to
clean up the threads . If that doesn't work, take it to a machine shop
and have them shoot a helicoil in it, Buy a new gasket and put it back
Any mower shop will have a head gasket or you can get one online. It
sounds like you have all winter to screw with it. You should check the
valve adjustments when you get it back together. They probably
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