Bottom Engine Mount

[colinjohn]

still a trainee member who enjoys reading and gaining info from the site.Can anybody help me please the bottom engine mounting bolt has now gone for the third time,my garage says he fitted high tensill steel bolt last time,should this continue to happen,or is there something else. (mk 1 1998 tdi)any thoughts.

[Neils TDi again]

The bottom engine mount that you are describing is the anti roll mounting in the middle of the engine at the rear.

Repeated failure of this bolt would indicate a potential set of circumstances:

 

1) The clutch release bearing is sticking and allowing the application of torque to be applied as a rapid introduction of force (the take off or gear change would feel jerky or snatchy)

2) The roll restrictor its self may have degraded, the rubber may have deteriorated to the point it is not absorbing the shock of the application of torque.

3) The dual mass flywheel is worn out causing the rapid application of force.

 

Ultimately the driving force of the engine has to push against a part of the body to push the wheels round, equall and opposite forces, the roll restrictor prevents the engine winding itself outof the body and forces the wheels round. So a new part and a new bolt may stop this repeating, just replacing the bolt is just fixing the symptom and not repairing the cause.

 

Best of luck

[colinjohn]

The bottom engine mount that you are describing is the anti roll mounting in the middle of the engine at the rear.

Repeated failure of this bolt would indicate a potential set of circumstances:

 

1) The clutch release bearing is sticking and allowing the application of torque to be applied as a rapid introduction of force (the take off or gear change would feel jerky or snatchy)

2) The roll restrictor its self may have degraded, the rubber may have deteriorated to the point it is not absorbing the shock of the application of torque.

3) The dual mass flywheel is worn out causing the rapid application of force.

 

Ultimately the driving force of the engine has to push against a part of the body to push the wheels round, equall and opposite forces, the roll restrictor prevents the engine winding itself outof the body and forces the wheels round. So a new part and a new bolt may stop this repeating, just replacing the bolt is just fixing the symptom and not repairing the cause.

 

Best of luck

 

thanks Neil, for that concise description,it now gives me something to go on,i will pass it on too my garage and hopefully that will sort the problem.will let you know what happens. colin

[si-mon]

Same thing has happened to my galaxy today... phoned local ford dealer and it is