A4 B7 2.0 TDI Revised Balance Shaft Assembly Failure
Discussion
Hi All
Last December the oil pump tensioner failed on my A4 B7 2.0 TDi. Thankfully this was noticed before the chain snapped so I was able to get away with **just** the revised gear driven oil pump/balance shaft being fitted.
This work was done within the dealership network and fortunately my Warranty Direct policy covered around half the cost.
Fast forward to two weeks ago when a metallic clatter developed from the engine, seemingly from the top end near the inlet manifold,this was accompanied by a higher and louder than usual idle speed (around 950 rpm,) and lack of power over 2000rpm.
Car went back to Audi dealership who after attempting to diagnose the issue admitted they had no idea, although one of the injectors reading was much lower than the others. They wanted £530 to investigate the injectors further (remove them, fit new seals and move injector around) although this would only identify if they were actually the cause. They didn't want to look into the oil pump or DMF (also fitted by them when the old oil pump was replaced) before looking at the injectors. I was able to get the price down to £300 so agreed to this.
Dealership have come back to say the injectors have been out and 'retimed' and are working correctly. They have investigated further and found that a sprocket on the balance shaft has worn which is causing the noise which they will replace under their parts warranty.
Reason for the ambling post is to ask if it would be unreasonable from me to query paying the £300.00 given that the injectors were not the cause and they wanted to rule this out before looking at anything else, given that the cause has now been identified as a part they originally fitted?
Was makes me suspicious is that they did not contact me to ask permission to further investigate the noise once the injectors were looked at. When the chain was failing originally I had to agree to a £400 charge to open the sump up, im guessing this would have been done to identify that the balance shaft sprocket was the cause.
Last question is how usual is it for there to be issues with the revised units?
Thanks
Last December the oil pump tensioner failed on my A4 B7 2.0 TDi. Thankfully this was noticed before the chain snapped so I was able to get away with **just** the revised gear driven oil pump/balance shaft being fitted.
This work was done within the dealership network and fortunately my Warranty Direct policy covered around half the cost.
Fast forward to two weeks ago when a metallic clatter developed from the engine, seemingly from the top end near the inlet manifold,this was accompanied by a higher and louder than usual idle speed (around 950 rpm,) and lack of power over 2000rpm.
Car went back to Audi dealership who after attempting to diagnose the issue admitted they had no idea, although one of the injectors reading was much lower than the others. They wanted £530 to investigate the injectors further (remove them, fit new seals and move injector around) although this would only identify if they were actually the cause. They didn't want to look into the oil pump or DMF (also fitted by them when the old oil pump was replaced) before looking at the injectors. I was able to get the price down to £300 so agreed to this.
Dealership have come back to say the injectors have been out and 'retimed' and are working correctly. They have investigated further and found that a sprocket on the balance shaft has worn which is causing the noise which they will replace under their parts warranty.
Reason for the ambling post is to ask if it would be unreasonable from me to query paying the £300.00 given that the injectors were not the cause and they wanted to rule this out before looking at anything else, given that the cause has now been identified as a part they originally fitted?
Was makes me suspicious is that they did not contact me to ask permission to further investigate the noise once the injectors were looked at. When the chain was failing originally I had to agree to a £400 charge to open the sump up, im guessing this would have been done to identify that the balance shaft sprocket was the cause.
Last question is how usual is it for there to be issues with the revised units?
Thanks
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