Knocking when clutch depressed
Discussion
When you depress the clutch you are loading the end of the crank and (obviously) breaking the connection between the engine and the gearbox. Therefore, I would be very surprised if the gearbox was creating the noise and would want to have a look at the crank endfloat.
With the engine running, get someone to depress the clutch whilst you look at the front pulley. There really shouldn't be any visible movement, if there is then you have too much crank endfloat which would tend to indicate significant wear to the crank or bearings. On some engines it's possible for the bearings that control the crank endfloat to detach themselves leading to excessive endfloat, but in honesty, I'm not sure whether the RV8 main bearings (used in AJP and S6) are prone to this or not.
Hopefully it's nothing of the sort, but definately worth a look as you wouldn't want to keep running an engine with excessive endfloat as it will kill the crank.
With the engine running, get someone to depress the clutch whilst you look at the front pulley. There really shouldn't be any visible movement, if there is then you have too much crank endfloat which would tend to indicate significant wear to the crank or bearings. On some engines it's possible for the bearings that control the crank endfloat to detach themselves leading to excessive endfloat, but in honesty, I'm not sure whether the RV8 main bearings (used in AJP and S6) are prone to this or not.
Hopefully it's nothing of the sort, but definately worth a look as you wouldn't want to keep running an engine with excessive endfloat as it will kill the crank.
itiejim said:
When you depress the clutch you are loading the end of the crank and (obviously) breaking the connection between the engine and the gearbox. Therefore, I would be very surprised if the gearbox was creating the noise and would want to have a look at the crank endfloat.
With the engine running, get someone to depress the clutch whilst you look at the front pulley. There really shouldn't be any visible movement, if there is then you have too much crank endfloat which would tend to indicate significant wear to the crank or bearings. On some engines it's possible for the bearings that control the crank endfloat to detach themselves leading to excessive endfloat, but in honesty, I'm not sure whether the RV8 main bearings (used in AJP and S6) are prone to this or not.
Hopefully it's nothing of the sort, but definately worth a look as you wouldn't want to keep running an engine with excessive endfloat as it will kill the crank.
Thanks for the info, itiejim, I'll check this out next drive.With the engine running, get someone to depress the clutch whilst you look at the front pulley. There really shouldn't be any visible movement, if there is then you have too much crank endfloat which would tend to indicate significant wear to the crank or bearings. On some engines it's possible for the bearings that control the crank endfloat to detach themselves leading to excessive endfloat, but in honesty, I'm not sure whether the RV8 main bearings (used in AJP and S6) are prone to this or not.
Hopefully it's nothing of the sort, but definately worth a look as you wouldn't want to keep running an engine with excessive endfloat as it will kill the crank.
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