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#1
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Strange problem
While turning a corner in my '93 Miata, there was an ominoius POPP
followed by a loud THWACKA THWACKA THWACKA. The problem was one of the plus had blown out with explosive force, I put in a new plug and everything is fiune. The three other plugs were snug and subseqiuent checks don't show any new loosening. I'd be interested in theories. My own is thart since the car is stored in bitter cold winter weather --- 35 below --- the cycle of deep freeze and thaw caused expansion and contraction that loosened the plug and that when I started driving in the spring, it was only a matter iof time before it came right out. Would be interested if anyone has had a similar experience. ds |
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#2
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Strange problem
"DS" > wrote in message ... > While turning a corner in my '93 Miata, there was an ominoius POPP > followed by a loud THWACKA THWACKA THWACKA. > The problem was one of the plus had blown out with explosive force, > I put in a new plug and everything is fiune. The three other plugs > were snug and subseqiuent checks don't show any new loosening. > I'd be interested in theories. > My own is thart since the car is stored in bitter cold winter weather > --- 35 below --- the cycle of deep freeze and thaw caused expansion > and contraction that loosened the plug and that when I started driving > in the spring, it was only a matter iof time before it came right > out. > Would be interested if anyone has had a similar experience. > ds I lost a plug in a similar manner -- different kind of car, but I don't see the brand as a significant issue here -- and had to have a heli-coil installed to hold the plug. The plug had come loose, and it damaged the threads. I also learned that I was supposed to use Anti-Seize on the threads. When I installed the plugs, they felt tight, but the torque spec is not very high and a bound plug can trick the torque wrench. I'd not have believed this to be true before I witnessed the result firsthand. Apparently the aluminum head and steel threads on the plug need to be greased up a little with antiseize, or the plug might not seat well. |
#3
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Strange problem
"Jeff Strickland" > wrote:
> I also learned that I was supposed to use Anti-Seize on the > threads. Always but be careful of this stuff! I've used it for years on motorcycles, the normal procedure is to open tube of Anti-Seize, put small amount on finger, wipe around the threads of the plug, install plug, stand up (remember it's a motorcycle?), step on tube of Anti-Seize which ruptures tube and squirts Anti-Seize for surprising distances in all directions. You'll also find the stuff is absolutely permanent on clothes, fingers, motorcycle seats, floors, etc.. -- XS11E, Killing all posts from Google Groups The Usenet Improvement Project: http://improve-usenet.org |
#4
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Strange problem
DS wrote:
> While turning a corner in my '93 Miata, there was an ominoius POPP > followed by a loud THWACKA THWACKA THWACKA. > The problem was one of the plus had blown out with explosive force, > I put in a new plug and everything is fiune. The three other plugs > were snug and subseqiuent checks don't show any new loosening. > I'd be interested in theories. > My own is thart since the car is stored in bitter cold winter weather > --- 35 below --- the cycle of deep freeze and thaw caused expansion > and contraction that loosened the plug and that when I started driving > in the spring, it was only a matter iof time before it came right > out. > Would be interested if anyone has had a similar experience. > ds I once had a well-used Corvair that had the same problem on three of its six cylinders. The plugs would remain in place for a little while, but would eventually pop right out. The situation worsened quickly. The solution was to install helicoils. It's possible that the plug was never installed properly; someone accidentally neglected to tighten it down perhaps. Otherwise, I find it a stretch to believe that the plug spontaneously unscrewed itself and popped out. I think your problems with this cylinder are not over. -- Dale Beckett |
#5
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Strange problem
DS > wrote:
> My own is thart since the car is stored in bitter cold winter > weather --- 35 below --- the cycle of deep freeze and thaw caused > expansion and contraction that loosened the plug and that when I > started driving in the spring, it was only a matter iof time > before it came right out. Probably a good idea to remove the plugs, re-apply antiseize compound and re-torque them in the spring before driving the car. -- XS11E, Killing all posts from Google Groups The Usenet Improvement Project: http://improve-usenet.org |
#6
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Strange problem
On May 12, 12:34*pm, "Jeff Strickland" > wrote:
> "DS" > wrote in message > > ... > > > While turning a corner in my '93 Miata, there was an ominoius POPP > > followed by a loud THWACKA THWACKA THWACKA. > > The problem was one of the plus had blown out with explosive force, > > I put in a new plug and everything is fiune. The three other plugs > > were snug and subseqiuent checks don't show any new loosening. > > I'd be interested in theories. > > My own is thart since the car is stored in bitter cold winter weather > > --- 35 below --- the cycle of deep freeze and thaw caused expansion > > and contraction that loosened the plug and that when I started driving > > in the spring, it was only a matter iof time before it *came right > > out. > > Would be interested if anyone has had a similar experience. > > ds > > I lost a plug in a similar manner -- different kind of car, but I don't see > the brand as a significant issue here -- and had to have a heli-coil > installed to hold the plug. The plug had come loose, and it damaged the > threads. > > I also learned that I was supposed to use Anti-Seize on the threads. When I > installed the plugs, they felt tight, but the torque spec is not very high > and a bound plug can trick the torque wrench. I'd not have believed this to > be true before I witnessed the result firsthand. > > Apparently the aluminum head and steel threads on the plug need to be > greased up a little with antiseize, or the plug might not seat well. The same thing happened to me over a decade ago on my '76 corolla in my pre-miata days. |
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