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Crankcase Opening Procedure

Prerequisite Only
This is a prerequisite-only guide! This guide is part of another procedure and isn’t meant to be used alone.

Introduction

pre-req guide on opening the crankcase cover in preparation for service inside the crankcase chamber

What you need

  1. Crankcase Opening Procedure, Disconnect the spark plug: step 1, image 1 of 2 Crankcase Opening Procedure, Disconnect the spark plug: step 1, image 2 of 2

    • Before you begin, disconnect the spark plug connector from the spark plug.

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  2. Crankcase Opening Procedure, Elevate the generator: step 2, image 1 of 1

    • Elevate the generator on a set of stable risers, like wooden blocks.

    • Place a drain pan underneath the generator, between the blocks.

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  3. Crankcase Opening Procedure, Drain the oil: step 3, image 1 of 3 Crankcase Opening Procedure, Drain the oil: step 3, image 2 of 3 Crankcase Opening Procedure, Drain the oil: step 3, image 3 of 3

    • Use a 12 mm socket to remove the oil drain plugs from either side of the generator.

    • Give the oil a few minutes to drain from the cylinder and crankcase housing.

    • Tip the generator back and forth towards either drain hole to allow any last bits of oil to drain.

    • Once the oil is finished draining, replace the drain plugs.

    • Tighten the drain plugs to 13 ft-lb (18 N-m) of torque.

    • During reassembly, be sure to refill the engine oil:

    • Use up to 0.58 liters of SAE 10W-30 oil, until the dipstick is almost completely submerged.

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  5. Crankcase Opening Procedure, Remove the shaft guard: step 4, image 1 of 3 Crankcase Opening Procedure, Remove the shaft guard: step 4, image 2 of 3 Crankcase Opening Procedure, Remove the shaft guard: step 4, image 3 of 3

    • Use a 12 mm socket to remove the two 20 mm-long bolts securing the shaft guard to the crankcase cover.

    • Remove the shaft guard.

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  6. Crankcase Opening Procedure, Unfasten the crankcase cover: step 5, image 1 of 1

    • Use a 12 mm socket to remove the six 32 mm-long bolts securing the crankcase cover.

    • During reassembly, tighten these bolts down to 17 ft-lb (24 N-m) of torque.

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  7. Crankcase Opening Procedure, Unfasten the upper cylinder shroud: step 6, image 1 of 3 Crankcase Opening Procedure, Unfasten the upper cylinder shroud: step 6, image 2 of 3 Crankcase Opening Procedure, Unfasten the upper cylinder shroud: step 6, image 3 of 3

    • Use a 12 mm socket to remove the nut securing the upper cylinder shroud and air guide plate.

    • Use a 10 mm socket to remove the 12 mm-long bolt securing the air guide plate.

    • Remove the air guide plate.

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  8. Crankcase Opening Procedure: step 7, image 1 of 3 Crankcase Opening Procedure: step 7, image 2 of 3 Crankcase Opening Procedure: step 7, image 3 of 3

    • Use a 10 mm socket to remove the 12 mm-long bolt securing the upper cylinder shroud.

    • Tilt the upper shroud upward slightly so the hook on the right of the shroud is free from the bolt.

    • You may need to bend the hook out of shape slightly to reposition the shroud like this.

    • If you do bend the hook, simply use a pair of pliers to bend it back into place before refastening the nut during reassembly.

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  9. Crankcase Opening Procedure, Remove the crankcase cover: step 8, image 1 of 3 Crankcase Opening Procedure, Remove the crankcase cover: step 8, image 2 of 3 Crankcase Opening Procedure, Remove the crankcase cover: step 8, image 3 of 3

    • When the shroud is sufficiently out of the way, remove the crankcase cover.

    • Residual oil may leak when you remove the cover. Be ready to catch any spillage.

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Conclusion

To reassemble your device, follow these instructions in reverse order.

Author

with 3 other contributors

Tarun Thiruma

Member since: 11/20/19

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