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Studebaker M15A-20 "Mr. Potato Head"

Wednesday, June 20, 2012

Valve Adjustment

I now have (56,001.7 - 54,349.3) 1,652.4 miles on this new rebuild and it is time to adjust the valves after the cam, lifters, and valves have broken in. Valve clearance is supposed to be 0.016" but I found all of them to be between 0.017" and 0.018" so I did not adjust them here are the as measured clearances:

SEQ
EC/IO
ADJUST
CLEARANCE
1
1I
6I
0.018”
3
5I
2I
0.017”
5
3I
4I
0.017”
6
6I
1I
0.0175”
8
2I
5I
0.018”
9
4I
3I
0.018”
7
1E
6E
0.018”
10
5E
2E
0.018”
2
3E
4E
0.018”
4
6E
1E
0.018”
11
2E
5E
0.018”
12
4E
3E
0.0175”

I also did a compression test on all cylinders:

CYLINDER
PSI
1
104
2
104
3
102
4
104
5
105
6
110

All six plugs look the same

 Insulators bright white and ground electrode light gray

Manifold and valve covers removed

 Front bank

 Rear bank




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