[Shop-talk] Coast in Neutral -the next great debate

[Arvid Jedlicka]

My thoughts …

The clutch is out. It was not stated but I will assume the engine is running. If the assumption is not correct then any thoughts that this whole process is a ‘good thing’ should not be entertained.

Given that the clutch is out and the engine is running then the input shaft is turning.

Given that the input shaft is turning then the counter-shaft is turning … at least slowly.

Given that the center-shaft is turning then the gears that float on the output shaft are turning and getting some lubrication picked up from the counter-shaft. Yes, they are turning at a different speed than the output shaft, but that is what those not engaged via the synchronizer\gear selector hub to the output shaft at any given time do for most of their lives anyway.

Given that the output shaft is turning (the driveshaft has not been disconnected) then everything is turning, which is exactly whey they do when it is in gear and rolling.

IMHO … no harm to the transmission. By the same token, no anti-harm (i.e. no advantage\saving) to the transmission, but no harm.

As mentioned, the brakes may want to file a (rational and reasonable) complaint, but the transmission would be fine with it … but very likely be fine with it either way. 

> On Dec 12, 2022, at 11:28 AM, Pat Horne <patintexas at icloud.com> wrote:
> 
> In general, I don’t see any problem. However I recall something similar decades ago where a tow truck driver did a two wheel haul on a car that was very low on trans fluid. After a long tow the trans bearings heated up & seized. Can’t say for sure that really happened or not. 
> 
> Peace,
> Pat
> 
> Pat Horne 
> We support Habitat for Humanity
> 
> 
> On Dec 12, 2022, at 10:05 AM, eric at megageek.com wrote:
> 
> I'm putting this out to the group to get some opinions from the real experts here. 
> 
> If you put a manually car or truck in neutral and release the clutch while going down long hills or coming to a stop at a intersection, are you doing any damage? 
> 
> I'm not worried about fuel savings, just is coasting in neutral with the clutch release. 
> 
> Any thoughts? 
> 
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