4.6 block back from mach shop, problems?
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Laughing Gas
Joined: Mar 2002
Posts: 1,060
Likes: 12
From: arizona
4.6 block back from mach shop, problems?
So, I took a 4.6 windsor block to the machine shop to have inspected. All they said is it needed to be bored .02 over. I said ok. Got it back, took it home started to reassemble and noticed on one of the cylinders some porosity...maybe pitting.
A couple of the cylinders did have some fliud in them when I cracked it open for the first time and I assumed it would need to be bored so not and issue.
I thinking now that the machine shop over looked this pitting and should have gone .03 over.
The pitting can be felt with my finger nail and seen with my eye.....not happy.
I'm not an expert but any pitting at all would cause fast premature failure for the rings .....is this correct? I mean the cylinder walls must be completely smooth??
Can one get away with any pitting at all??
What do you think? Take it back and ask the guy if he was drinking or something, I mean if I can see it should he not have noticed it and called me and let me know?
This motor I bought used off the street from some smo, so history is suspect.
A couple of the cylinders did have some fliud in them when I cracked it open for the first time and I assumed it would need to be bored so not and issue.
I thinking now that the machine shop over looked this pitting and should have gone .03 over.
The pitting can be felt with my finger nail and seen with my eye.....not happy.
I'm not an expert but any pitting at all would cause fast premature failure for the rings .....is this correct? I mean the cylinder walls must be completely smooth??
Can one get away with any pitting at all??
What do you think? Take it back and ask the guy if he was drinking or something, I mean if I can see it should he not have noticed it and called me and let me know?
This motor I bought used off the street from some smo, so history is suspect.
Last edited by z 97ford1; May 25, 2013 at 07:51 PM. Reason: more info
Hotshot
Joined: Jul 2005
Posts: 11,931
Likes: 180
Ideal, you would want everything as smooth as possible as you said. That being said, i overhaul old farm tractors and some of this small pitting is normal and dont cause a problme. How much do you see, and how bad is it ? If its really bad, and you take off .010 inch, thats .005 on each side (radius).. Will that clean it up, or just spend more money? I guess you dont have pistons and rings yet, or did the machine shop supply that ?
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Laughing Gas
Joined: Mar 2002
Posts: 1,060
Likes: 12
From: arizona
Difficult for me to measure. I move my fingernail across the surface and I feel it while the rest of the surface is smooth (minus the crosshatch).
Could be .001/.002 deep. Even if it was .001 deep, would that not cause the rings to fail in a very short period of time?
Would the rings slowly clean the pitted surface smooth or would the pitting wear the rings in that area?
Which is harder, the rings or the cylinder walls?
How much pitting is there.....maybe 5 or 6 spots .05 dia.
Uncertain.....
Could be .001/.002 deep. Even if it was .001 deep, would that not cause the rings to fail in a very short period of time?
Would the rings slowly clean the pitted surface smooth or would the pitting wear the rings in that area?
Which is harder, the rings or the cylinder walls?
How much pitting is there.....maybe 5 or 6 spots .05 dia.
Uncertain.....
Last edited by z 97ford1; May 26, 2013 at 12:31 PM. Reason: more info
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