Hi guys!
Long time no refresh:
BLOCK:
- is in machining facility, waiting in row to be bored/honed.. I am eager to hear is it .02 or 03 or even more to order pistons
- I am leaning towards Sealed Power H273CP Hypereutectic, cast pistons with Hastings 2M139 rings
CRANK:
- it could have been poslihed to .001 with a little bit of gamble but to make it 100% okay, machining facility suggested grinding when I have it all out... I am also waiting for info, but it should be .01
CAM:
- I polished journals to mirror shine, now there is no trace of nothing but bare nice shiny metal
- as I work in cylindrical grinding company (cutting tools) I put camshaft on one of our machines between centerpoints where cam was originaly made at least 34 years ago:
First of all I checked RUNOUT:
FRONT
J1 0.0001
J2 0
J3 0.0001
J4 0.0006 ***largest runout (15microns in mm)
J5 0
Specification or book says for crank journal diameters folowing:
J1 2.081 ±0.0005
J2 2.066 ±0.0005
J3 2.051 ±0.0005
J4 2.036 ±0.0005
J5 2.021 ±0.0005
We have measured this:
FRONT
J1 2.0803 2.0804
J2 2.0639 2.064
J3 2.0499 2.0501
J4 2.034 2.0342
J5 2.0201 2.0202
So I am with all yournals slightly below lower tolerance, all measures are from middle specification value (tolerance 0.0005"), DIFFERENCE:
J1 -0.0002 -0.0011
J2 -0.0016 -0.0025 ***worst .002" below min
J3 -0.0006 -0.0014
J4 -0.0015 -0.0023 ***worst .0018" below min
J5 -0.0004 -0.0013
- journals #2 and #4 are out of tolerance big time (.001 to .002 more than specified)
- jorunal #4 additionaly has 0.0006 runout - if I correct that i diameter will be at something like .0021 to 0.0029 below minimum
Whoever built an engine and measured old cam's I need HELP.... I don't know it this is good enough.
There is no runout tolerance in books, and I am roughly and at least at -0.001 below specified diameter tolerances... I don't know if I will loose oil pressure...
Is this worth a try, or shall I look for new CAM?
Thx in advance guys for help