| Checking function of viscous coupling |
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| Drive front wheels of vehicle onto rolling road. |
Warning | Ensure area in front of vehicle is kept free. Carry out test with care to avoid damage. |
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| Engage “D” and slowly start driving. |
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| If the vehicle is pushed off the rolling road at an engine speed of 1500 to 2500 rpm, the viscous coupling OK. |
| When the front wheels are driven whilst the rear wheels are stationary, the viscous coupling will lock up. This means that the rear wheels are also driven. |
| The viscous coupling can accept differing speeds for a short period without locking up only with 1st gear engaged and engine speed slightly above idling speed. |
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