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**Dvjkefdw** · 12-29-2009, 01:25 PM

What do you mean by the starter turns but the engine doesn't?
If the starter sounds like it's operating normally - making a nice loud whirr - and the engine is definitely not turning over - checked by someone watching it, then the fault is 95% likely to be the sprag, one way clutch on the drive pinion slipping.
The other 5% would be a stripped flywheel or pinion.
Pre-engaged starters move the pinion into mesh BEFORE the solinoid is activated, so that rules out some of the ideas presented.

However, if the engine isa ctually turning over slowly on the starter, it could be a number of other factors - remember that winter driving is very hard on batteries as a/ the thicker engine oil and resistance is harder to turn, b/ a cold battery can supply less current and/or have a greater voltage drop, c/ in Winter there is a greater load on the charging circuit due to running the lights more, demisters, seat heaters, etc, and slower driving usually neans the engine alternator is running slower.
Normal fully charged battery has a voltage of 13.2 Volts, if yours is lower, it isn't getting a full charge and, over time, it will accept less cahrge and the viscious circle continues.

12-29-2009, 01:25 PM	#23
Dvjkefdw Join Date Oct 2005 Posts 521 Senior Member	What do you mean by the starter turns but the engine doesn't? If the starter sounds like it's operating normally - making a nice loud whirr - and the engine is definitely not turning over - checked by someone watching it, then the fault is 95% likely to be the sprag, one way clutch on the drive pinion slipping. The other 5% would be a stripped flywheel or pinion. Pre-engaged starters move the pinion into mesh BEFORE the solinoid is activated, so that rules out some of the ideas presented. However, if the engine isa ctually turning over slowly on the starter, it could be a number of other factors - remember that winter driving is very hard on batteries as a/ the thicker engine oil and resistance is harder to turn, b/ a cold battery can supply less current and/or have a greater voltage drop, c/ in Winter there is a greater load on the charging circuit due to running the lights more, demisters, seat heaters, etc, and slower driving usually neans the engine alternator is running slower. Normal fully charged battery has a voltage of 13.2 Volts, if yours is lower, it isn't getting a full charge and, over time, it will accept less cahrge and the viscious circle continues.
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