Inspection - TM-55-1930-208-240284

TM 55-1930-208-24

(8) Cylinder liners are available in .001 inch, .005 inch, 0.10 inch, 0.20 inch, and .030 inch oversize on the outside

diameter. When an oversize liner is installed, stamp the amount of the oversize on top of the cylinder bore adjacent to

the liner counterbore.

(9) The cylinder bores in a new cylinder block are classified as #1, #2, or #3 (table 4-1) designating the specific size

range for each bore and appropriate cylinder liner that may be fitted to each bore.

(10)

A new standard size cylinder liner is also classified as #1, #2, or #3.

(11) Although the block bores and liners should be measured to determine the liner-to-block clearance, the selection of a

liner is narrowed down to only those in the appropriate classifications or possibly a .001 inch oversize liner.

(12) Before installing a liner in a used cylinder block, always lightly hone the block bore.

(13) After honing block bore, check the bore measurements to determine if a standard liner (classification #1, #2, or #3)

or possibly a .001 inch oversize liner can be used (refer to table 4-1). A push fit between the liner and the block is

desirable. If an adequate push fit cannot be obtained. It may be necessary to bore the block to receive an oversize liner.

(14) When it becomes necessary to install an oversize liner, the same care in selective tolerance fitting must be adhered

to. However, it may be more difficult to select an oversize liner since the size range is not broken down into

classifications.

(15) In deciding whether boring is necessary or not, keep in mind that each bore in a used block must not be out-of-

round or tapered more than .002 inch. If the average block bore is over 4.6285 inch, the cylinder block should be bored

oversize.

(16) To determine what size to re-bore the cylinder block for an oversize liner, each service liner used must be

measured on the outside diameter for size in three places (under the flange, between the flange and the ports, and above

the ports). The cylinder bore size will be determined by the average liner measurement taken at the three positions.

EXAMPLE:

Service line O.D. measures 4.6280"

O.D. size = 4.6280"

plus clearance = .0005"

bore size = 4.6285"

Then, 4.6235" + .001" boring tolerance will allow a bore size of 4.6285" to 4.6295" and a possible liner-to-block clearance

of .0005" to .0015". The clearance tolerance is the dimensional difference between the liner O.D. and the block bore I.D.

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