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With the heads torqued down and the camshafts installed, I checked the valve clearance, as this is critical once the engine gets up to temperature. You need the correct clearance so that the material can expand. If you don't have the correct clearance, valves can remain open and you loose power. Or worse....bend a valve!!
So, its a slow and painstaking process. Measure and record the clearance. Measure and record AGAIN. As per the Subaru manual, you add the thickness of the bucket shim, to the measured clearance for that valve, then subtract 0.2mm for the inlet valve or 0.35mm for the exhaust. This gives you the new shim thickness you need to fit to achieve the factory clearance.
Unfortunately only 3 of my valves were correct. This is because a complete set of new valves were installed, so its only to be expected. I now have to juggle the buckets around a bit to see if I can achieve a better figment. If not, I have to get the wallet out and buy new valve buckets!
So, its a slow and painstaking process. Measure and record the clearance. Measure and record AGAIN. As per the Subaru manual, you add the thickness of the bucket shim, to the measured clearance for that valve, then subtract 0.2mm for the inlet valve or 0.35mm for the exhaust. This gives you the new shim thickness you need to fit to achieve the factory clearance.
Unfortunately only 3 of my valves were correct. This is because a complete set of new valves were installed, so its only to be expected. I now have to juggle the buckets around a bit to see if I can achieve a better figment. If not, I have to get the wallet out and buy new valve buckets!
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