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Dimensions (5th & 6th columns) The dimensions shown in column 5 are the minimum and maximum dimensions for the part as manufactured. The dimensions shown in column 6 indicate the limit that must not be exceeded. Unlessit can be restored to serviceablesize, any
part that exceeds this dimension must not be rebuilt into an engine.
Clearance(7th & 8th columns) Like the dimensions shown in the 5th and 6th columns, the clearance representsthe fit between the two mating surfaces as controlled during manufacture and as a limit for permissible wear. Clearances may sometimes be found to disagreewith limits for mating parts; for example, maximum diameter of cylinder minus minimum diameter of piston exceeds limit for piston and barrel clearance. In
such instances, the specified maximum clearance must not be exceeded.
In some instances, where a parts revisionhas caused a dimensional or tolerance change, the superseded dimenional data has
been deleted from the list; provided compliance with the change is not mandatory.
Letters of the alphabet and numbers are used as symbols throughout the Table of Limits to represent specificinterpretations and to designate engine models. Letters in parenthesis refer to dimensional characteristics; letters (or
combinations of letters and numbers) without parenthesis indicate engine models. They are listed below with their separatedefinitions.
(A)
These fits are either shrink fits controlled by machining, fits that may readily be adjusted, or fits where wear does not normally occur. In each case, the fit must be held to manufacturing tolerance.
(B)
Side clearance on piston rings must be measured with face of ring flush with piston.
(D)
The dimensions shown are measured at the bottom of the piston skirt at right angles to the piston pin.
(E)
Permissible wear of the crankshaft (rod and main bearing journals) to be minus 0.0015 on the diameter.
(L)
Loose fit; wherein a definite clearance is mentioned between the mating surfaces.
(T)
Tight fit; shrink or interference fit.
(WD) WideDeck Crankcase.
i
Introduction
The illustrations shown are typical of the referenced limit or fit described in the Table and in no instance are these illustrations intended to represent a specific part or engine model unless specified. Also, the terms used to designate cylinder, piston and ring materials such as "nitride, chrome, half-wedge" are more fully explained in the latest edition of Service Instruction No. 1037.
PART I DIRECT DRIVE ENGINES (Including VO and IVO-360)
CHART MODELS CHART MODELS
A 0-235
Al 0-235-F, -G, -K, -L
B 0-290
B1 0-290-D2
D 0-435-A
BD 0-320-H(76 Series)
G O, IO, LIO, AEIO-320
G1 o, IO-320 With Gov. at Front
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本文链接地址：Lycoming SERVICE TABLE OF LIMITS AND TORQUE VALUE RECOMMENDATIONS(2)
