Step | Action | Value | Yes | No | ||||||
|---|---|---|---|---|---|---|---|---|---|---|
1 |
Does the flywheel have chipped or missing teeth or is bent? | -- | ||||||||
2 |
Has the noise stopped? | -- | System OK | |||||||
3 | Start the engine while listening to the starter motor turn. Do you hear a high pitched whine during cranking (before the engine fires) but the engine cranks and fires normally? | -- | ||||||||
4 | Shim the starter motor towards the flywheel by adding short shims between the outboard starter motor mounting pad and the engine mount. Do not add more than four shims Has the noise stopped? | -- | System OK | -- | ||||||
5 | Start the engine while listening to the starter motor turn. (The engine cranks and fires normally. This is often diagnosed as starter hang-in or a weak solenoid.) As the key is being turned, do you hear a high-pitched whine after the engine fires? | -- | ||||||||
6 | Shim the starter motor away from the flywheel by adding long shims, one at a time, between the starter motor and the engine block. (Flywheel runout makes this appear to be intermittent.) Has the noise stopped? | -- | System OK | -- | ||||||
7 | Start the engine while listening to the starter motor turn. (The noise may sound like a siren if the engine is revved while the starter is engaged.) Is there a loud whoop noise after the engine fires, but while the starter is still held engaged? | -- | ||||||||
8 | Do you hear a rumble, a growl, or, in severe cases, a knock as the starter is coasting down to a stop after starting the engine? | -- | System OK | |||||||
9 | Replace the starter motor. Refer to Starter Motor Replacement . Has the noise stopped? | -- | System OK | -- |
