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Just slinging this out there!
Pre-Ignition????
Willy started "tapping" many years back ('46 Willys L-134 [flathead])
I had rebuilt him in 1996, and he had less than 20,000 miles on him.
After tearing into the EZer stuff 1st and then digging in further.
I pulled the head, I found that #4 had a 1/2" - 3/4" long piece of ring
sitting on top of the piston, you could see where is slapped around prior
to sticking.
When it "stuck" it was barely contacting the head, hence the tapping sound (the head was not damaged, magnafluxing
revealed no cracks inside or out.)
It kinda sounded like a pushrod or rocker----But a flathead has neither!
It was really different looking in the head's chamber and on top of the piston from the others.
My friend, who does production engine rebuilds, came over and said I had a
Teeny-Weeny coolant leak into that cylinder, which was causing detonation,
which also broke the end of the ring off------Said He!
IF, there was any kind of popping----I did not hear it happening????
Well, I had already pulled the pan to see if it was rod issue.
The cylinder wall did not even have a scratch!
I was going to just replace the piston and rings----but I had to buy a full set of each to get one.
Same for the rod bearings.
I would just replace all 3 in all 4 cylinders.
I had the head shaved and I borrowed a ball hone from my friend, I honed a 4 a little bit, and put it
all back together with a new head gasket.
All has been fine ever since!
Playing it safe---I have rechecked the torque several times!
-----JEEPFELLER
![Automotive tire Tints and shades Circle Asphalt Soil]()
The ring segment pushed straight up and did not hurt the cylinder wall.
![Fluid Cylinder Gas Musical instrument Auto part]()
After surfacing---#4 is a different color----The chamber (below) and the top of the piston appeared like they
been sandblasted or had a peppered like surface----My friend said each "micro-crater" had been
a "lightning strike" in the combustion chamber.
![Wood Bumper Gas Automotive exterior Space]()
Pre-Ignition????
Willy started "tapping" many years back ('46 Willys L-134 [flathead])
I had rebuilt him in 1996, and he had less than 20,000 miles on him.
After tearing into the EZer stuff 1st and then digging in further.
I pulled the head, I found that #4 had a 1/2" - 3/4" long piece of ring
sitting on top of the piston, you could see where is slapped around prior
to sticking.
When it "stuck" it was barely contacting the head, hence the tapping sound (the head was not damaged, magnafluxing
revealed no cracks inside or out.)
It kinda sounded like a pushrod or rocker----But a flathead has neither!
It was really different looking in the head's chamber and on top of the piston from the others.
My friend, who does production engine rebuilds, came over and said I had a
Teeny-Weeny coolant leak into that cylinder, which was causing detonation,
which also broke the end of the ring off------Said He!
IF, there was any kind of popping----I did not hear it happening????
Well, I had already pulled the pan to see if it was rod issue.
The cylinder wall did not even have a scratch!
I was going to just replace the piston and rings----but I had to buy a full set of each to get one.
Same for the rod bearings.
I would just replace all 3 in all 4 cylinders.
I had the head shaved and I borrowed a ball hone from my friend, I honed a 4 a little bit, and put it
all back together with a new head gasket.
All has been fine ever since!
Playing it safe---I have rechecked the torque several times!
-----JEEPFELLER
The ring segment pushed straight up and did not hurt the cylinder wall.
After surfacing---#4 is a different color----The chamber (below) and the top of the piston appeared like they
been sandblasted or had a peppered like surface----My friend said each "micro-crater" had been
a "lightning strike" in the combustion chamber.
