Thanks everyone for all the help and suggestions. I ran out of time to
finish the job yesterday, but I'll go to the store today and pick up a
thread chaser and try and finish, and then see how the car runs with the
right plugs in it for the first time in many years!
Nels Anderson
nels@flightsim.com
1953 MGTD 28177
Larry Karpman wrote:
> If you've been running 1/2" plugs in a 3/4" plug hole, it's best to buy a
> 14mm (I believe) spark plug thread chaser to clean the unused threads of
> buildup. It will allow removal of the build up rather than pushing down into
> the head. The buildup collects in grooves along the sides of the chaser and
> allows for complete removal. I had the exact situation you have when I got
> my TD.
>
> Larry
>
> -----Original Message-----
> From: owner-mg-t@Autox.Team.Net [mailto:owner-mg-t@Autox.Team.Net] On Behalf
> Of dcong996@earthlink.net
> Sent: Wednesday, May 09, 2007 2:34 PM
> To: Nels Anderson
> Cc: mg-t@autox.team.net
> Subject: Re: Sparking Plugs
>
> " If so, mine says: 88422"
> ?
> Could this be the end of 168422 ( it not readable and the 6 looking like an
> 8 ? Some of this castings were rough- If so the 3/4 plug is correct, and the
> previous plugs were wrong.
> Ye you are just after the thread measurement. Measure as suggested. He is
> saying to bend a small 90 in the end of a wire, insert it through the
> sparkplug hole and pull the bent portion up against the underside of the
> head. Carefully mark or scribe the outside of the wire against the head
> where the plug would seat. Remove and measure. As cautioned don't drop the
> wire in the hole. I would use a piece about a foot long, so that it wouldn't
> fall in if it slipped.
> If the head is for 3/4 reach plugs, and 1/2 inch were used for awhile, there
> may be some carbon buildup in the lower unused threads. If so, carefully
> clean this out, as the 3/4 plug may resist going all the way in. Some
> penetrating oil to soften the crud would help. A tap the same thread of the
> plug , 14mm I think, would be ideal.
>
> Dallas
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