Operating instructions

MARCH 1982 10-1
SECTION X
IO-520-BB,CB,MB
10-1 INTRODUCTION
A. Information contained herein applies to the modified
crankshaft version of the Permold IO-520 engines (IO-
520 BB, CB, MB). Only those instructions which are
different from the standard models (IO-520 B, BA, C,
M) will be covered.
B. For overhaul instructions not contained in these
pages, use the instructions contained in sections 1 thru 9
for the standard versions.
10-2 GENERAL
A. The modified crankshaft version of the Permold
engines has a different crankcase, crankshaft, connecting
rod and fuel pump.
B. Specifically the three rear bearing bores of
the crankcase have been enlarged, the three rear main
bearings of the crankshaft have been increased in
diameter and the rods have been made narrower.
Because of the increased bore size of the crankcase, the
fuel pump requires a larger adapter pilot. The different
bearing diameters also require different bearings, and the
narrow rods require different rod bearings.
10-3 TABLE OF LIMITS
A. Except for the differences in the crankshaft section of
the Table of Limits, all procedures listed in sections 1
thru 9 for the standard Perm old engines apply to the
modified crankshaft version.
B. Use the values in Table 21 instead of Table 12,
reference items 44 thru 59, for the modified crankshaft
engines -
FIGURE 10-1 TABLE OF LIMITS CHART