Kapok6
15+ Year Contributor
- 1,392
- 267
- Aug 10, 2004
-
Fort Worth,
Texas
I disassembled my head for a thorough inspection and cleaning. I noticed on the #1 intake cap and journal, there was a gouge with some high and low point, and some nice scuffing on the correlating journal. Some light scratching on the other journals too, but not as bad as #1.
So I took some 600 grit paper to them, then some 1000 grit, then a rag with some aluminum polish. I was able to knock it down to where I can't catch it on my fingernails.
Now I know plastigage isn't going to be very accurate on an aluminum journal in comparison to some iron main caps, but I wanted to try to get some kind of idea where I am.
So all the intake journals measured at .004" with one being .0045". I then did the exhaust cam as sort of a control, and they were all between .003" and .004", (so .0035"ish). with one closer to .004".
Now, the FSM gives a range of .002"-.0035."
Am I screwed with the intake journals being about .0005 out of that range? I run 10w40 or 20w50 oil. Not sure if that makes a dif on cam journals the way it does on main and rod bearing clearances.
Please no opinions here unless there are facts to back it up. Not looking for, "Yeah brah, your head is trashed, I would get another one, but I have no info or experience to back that statement up or explain why."
Looking for fact based information on this.
Thanks.
-Ryan
So I took some 600 grit paper to them, then some 1000 grit, then a rag with some aluminum polish. I was able to knock it down to where I can't catch it on my fingernails.
Now I know plastigage isn't going to be very accurate on an aluminum journal in comparison to some iron main caps, but I wanted to try to get some kind of idea where I am.
So all the intake journals measured at .004" with one being .0045". I then did the exhaust cam as sort of a control, and they were all between .003" and .004", (so .0035"ish). with one closer to .004".
Now, the FSM gives a range of .002"-.0035."
Am I screwed with the intake journals being about .0005 out of that range? I run 10w40 or 20w50 oil. Not sure if that makes a dif on cam journals the way it does on main and rod bearing clearances.
Please no opinions here unless there are facts to back it up. Not looking for, "Yeah brah, your head is trashed, I would get another one, but I have no info or experience to back that statement up or explain why."
Looking for fact based information on this.
Thanks.
-Ryan