KNOCK IN ENGINES
What makes an engine knock or pound? A loose pillow block box is a good
"knocker." The pillow block is a box next crank or disc wheel. This box
is usually fitted with set bolts and jam nuts. You must also be careful
not to set this up too tight, remembering always that a box when too
tight begins to heat and this expands the journal, causing greater
friction. A slight turn of a set bolt one way or the other may be
sufficient to cool a box that may be running hot, or to heat one that
may be running cool. A hot box from neglect of oiling can be cooled by
supplying oil, provided it has not already commenced to cut. If it
shows any sign of cutting, the only safe way is to remove the box and
clean it thoroughly.
Loose eccentric yokes will make a knock in an engine, and it may appear
to be in the wrist. You will find packing between the two halves of the
yoke. Take out a thin sheet of this packing, but don't take out too
much, as you are liable then to get them too tight and they may stick
and cause your eccentrics to slip. We will have more to say about the
slipping of the eccentrics.
Pages:
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97