Figure 3-13. Sea water strainer insured when the coupling bolts are secured

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Figure 3-12. Bilge pump installation, hull numbers 8540 thru 8560 and 8580 thru 8018.

TM-55-1905-217-12 Landing Craft Mechanized; Steel; DED; Overait Length 74 Feet Mod 1 Marl VIII Navy Design LCM-8 Hull Numbers 8500 and 8580 thru 8618 Manual

Figure 3-15. Stuffing box installation, hull numbers 8540 thru 8560 and 8580 thru 8618.

TM 55-1905-217-12

Figure 3-14. Stuffing box adjustment, hull numbers 8500

thru 8519 and 8520 thru 85S9.

sight, which for all practical purposes is a true line. This

method consists of boring a large hole in the ends of two

boards. One board is fitted at each end bearing of the set

Figure 3-13. Sea water strainer insured when the

to be aligned. A small hole (about 1/16-to 1/8-inch) is

coupling bolts are secured.

drilled in two pieces of thin sheet metal. The sheet metal

is placed on the boards and the small holes are adjusted

Methods of Determining Alignment.

so that they are aligned with the center of the end

bearings. A light is placed behind the board on one end

(1) Running a line wire. The proper location of the

and observed through the hole in the board at the other

bearings on main propulsion shafting may be checked by

end. The intermediate boards are adjusted so that the

running a line wire. This consists of rigging supports just

light can be seen through all the holes. The center of

clear of the end of the outer bearings of the set to be

these holes serves to establish the reference line.

aligned. A length of piano wire is stretched between the

supports. The supports must be rigid and not subject to

(3) Flange method. When it is suspected that the shaft is

deflection when the wire is put under tension. The wire

out of alignment, it should be checked by slacking the

should be attached to the supports in such a way that it

coupling bolts at a coupling near the suspected area on

can be accurately centered in the end bearings. After the

the shaft. Feelers are inserted between the coupling

wire has been centered in the end bearings, the wire

flanges, and if there is a greater distance between the

forms the line of reference (when corrected for sag) for

faces at one part of the coupling than at another, the

all the intervening bearings.

shafts are out of alignment at these places.

(2) Optical method. Alignment of shafting by the

optical method makes use of the ,line of

3-16