timing chain
 

Hi guys, I mechanic just told be the timing chain jump. Can this damage the valve or can the chain be adjusted? Help

The timing chain jumping is def not good. There are tensioners to prevent this. How exactly does he know it jumped?

Is this a BMW dealer? I'd ask for another opinion if not. A timing chain jumping is a serious (and rare) problem.

No, This is a guy claiming he is a expert in working on BMW! Also, the dealer said this is a rare event but they want to break the head down. They are starting with a quote of 2,500. The error the guy had on his OBII was The Blank cam B have over retarded it position and there is no compressor on one off the heads.

Thanks,

What is the car doing badly that made you bring it into a mechanic in the first place? What are the symptoms?

Ouch! No compression means bent valves too! What year and what mileage? 4.4 liter?

I have 60K and 3.0 liter.. I changed the valve cover gaskets that is it but the car internal condition of the motor was bad. A lot of oil built up on the cover and inside the engine.

The mechanic must have checked the camshaft sprocket and flywheel timing marks and found that they were not matching!
The timimg chain "jumping " a tooth on the sprocket gets your timing all wrong and your valves will be touching your pistons and bend!They need to open up that cylinder head and check all damage.As well as the valves,You may also have damaged pistons,rings and your block cylinder wall may be scratched!
This is a major engine job!You will only know the total damage by removing the head.

Is it possible that no valve or head is scratched? Are you give the worst case?

In regard to your sludge build in the valve cover and head, I'm curious to know what oil you've been using and what your oil change intervals have been.

Also, do you know which cylinders on that bank don't have compression, or is it just all of them?