Assembling an engine is always a delicate and delight full task. First in the row is a THROUGH cleaning, which takes quite some time. The engine should realy be as clean as possible before I check the tolerances and start the building session.
After cleaning the parts and the block, I have measured everything around the unit and checked if all tolerances fall between the factory specifications.
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Engine Build Sheet
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Camelot Restorations
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Project: Cooper „S”
Mk3 WP
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Displacement: 1293ccm
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Engine type: A series, cooper S
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Compression ratio: 1:9.75
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Piston-bore clearance
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1.
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2.
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3.
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4.
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5.
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6.
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Fact
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0.04-
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0.04-
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0.04
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0.04+
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0.035-0.063
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Piston ring side clearance
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1.
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2.
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3.
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4.
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5.
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6.
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Fact
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1.
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0.05*
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0.05*
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0.05
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0.05+
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0.04-0.06
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2.
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0.05*
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0.05-
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0.05
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0.05
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0.04-0.06
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3.
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0.05
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0.05*
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0.05
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0.05
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0.04-0.06
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4.
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Main bearing clearance
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1.
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2.
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3.
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4.
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5.
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Fact
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0.06
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0.06+
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0.06+
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0.035-0.075
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Big end clearance
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1.
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2.
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3.
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4.
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5.
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6.
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Fact
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0.05
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0.06
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0.05+
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0.06
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0.035-0.075
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Valve clearance
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1.
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2.
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3.
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4.
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5.
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6.
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7.
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8.
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9.
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10.
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11.
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12.
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Fact
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0.06
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0.05
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0.05
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0.05-
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0.06+
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0.05+
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0.05+
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0.06
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0.05-0.075
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Crankshaft axial free play: 0.14
After checking the tolerances, I balanced the con rods and the pistons. Con rods are end-to-end within 2 grams to one another. Total weight is 739g in average. Pistons are also 2 grans from each other, weighting 357g without the rings, and 377g with the ring pack average.
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