|
I assume the technique is the same as on my former diesel. Shims of different thickness set between the cam lobe and the top of a tappet on the top of the valve stem & spring assembly and adjust the clearance. Its important not to go too long as the valve seats usually wear faster and reduce the clearance which will lead to burnt valves! A shop assortment is very expensive at several $100!
Here is the technique I used. First buy the valve depressor tool and the shim pliers from your Volvo dealer. Then take off the valve cover and measure and record the clearance between the cam lobe and the shim, (assuming you know how to properly set the cam for this) Then using the tools, take out each shim in turn and read or measure its thickness and put it back, also record these values. Now put the valve cover back on using the old gasket for the few days you will need to get the new shims. Use the data recorded to determine the new shim value needed at each valve. (Always err on the loose side or more clearance if you must err!) Comapare the new determined shim numbers to those available from other valve positions and allocate your existing shims to as many locations as possible. The missing values are the ones you need to order from your volvo dealer along with a new cover gasket. Once the new shims arrive, go back to the car and move the existing shims to their new locations, install the new shims in the proper spots and save the left overs for some other time. The next time you can probably guess which shims are likely to be needed and order them before starting the project. Good luck. I got a lot of satisfaction in doing the job and saved the cost of the tools the first time.
|
