Engine Alignment Calculator

Evaluate coupling alignment and determine shim corrections

Feeler gauge measurement at the 12 o'clock position of the coupling faces. Measure in thousandths of an inch.
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Feeler gauge measurement at the 6 o'clock position of the coupling faces.
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Feeler gauge measurement at the 9 o'clock position (port side) of the coupling faces.
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Feeler gauge measurement at the 3 o'clock position (starboard side) of the coupling faces.
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Outer diameter of the coupling flange where measurements are taken. Used to calculate angular misalignment per inch.
inches

Results

Vertical Offsetthou
Horizontal Offsetthou
Angular Misalignmentthou/in
Alignment Quality
Shim Recommendations
References: ABYC P-1 Engine Installation standards. Target: less than 3 thou total indicator runout (TIR) for most marine engines. Max angular: 0.5 thou/in of coupling diameter.