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M/T - Clattering Sound in Neutral

83ford10

Article No. 83-16-24


NOISE - MANUAL TRANSMISSION -

NEUTRAL GEAR ROLLOVER - REVISION TO TSB 83-4-18


LIGHT TRUCKS 1983 RANGER

This cancels and supersedes TSB Article 83-4-18 dated February 22, 1983. Please mark your copy of that Article to refer to this new TSB Article.

Neutral gear rollover is identified as a clattering sound, similar to an idling diesel when the transmission is in neutral and the clutch is engaged. It is generated by transmission gears rattling against each other in response to engine firing pulses. A steady whirring or whining noise is not "neutral gear rollover".

Neutral gear rollover noise may occur at low "green engine" idle speeds and, as a test, can be eliminated when idle speed is slightly increased by depressing the accelerator pedal. (See note below). It can also be eliminated by depressing the clutch pedal because the transmission internal components are not turning. Pushing the shift lever towards 2nd, 3rd or 4th gear while in neutral will reduce the gear rollover noise by causing a synchronizer to drag.

Since the engine "green idle" speed should normally increase after engine break-in (1,000 to 1,500 mile range), the higher idle speed will be sufficient to eliminate the neutral gear rollover noise. However, on units where the idle speed does not sufficiently increase and neutral gear rollover noise is present, the noise can be eliminated by adjusting the idle speed to the break-in idle speed setting specified in the emission decal.
NOTE: No attempt should be made to increase idle speed on vehicles below 1,500 miles (engine not yet broken in) in order to eliminate the neutral gear rollover noise. This may cause excessively high idle speed after engine break-in, leading to dieseling and loss of fuel economy. The customer should be assured that the neutral gear rollover noise, when eliminated, has not caused any damage to the transmission assembly or to any transmission component.

OTHER APPLICABLE ARTICLES: None
WARRANTY STATUS: "INFORMATION ONLY"
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