Break-in Procedure for New Turnkey Engine
After installation by a qualified professional mechanic, follow this schedule to break in your new engine. During the initial break-in period, avoid excessive RPM at all times.
The Importance of Frequent Valve Adjustment
Many air-cooled VW owners don't adjust their engine valves often enough. Valves stretch slowly during use - especially the exhaust valve. Over time, this stretching results in tight valves, or valves without enough lash clearance. Without adequate clearance, the valves don’t sit tight in the valve seat, leaking hot gases past the valve. When this happens, the valve begins to overheat and will, in very little time, weaken and burn or, worse, break.
Even if very little adjustment is needed each time, frequent valve adjustment also means that you get a chance to notice a faulty exhaust valve before it breaks. Over time and course of many periodic adjustments, the valve will eventually weaken and begin stretching abnormally. If the adjustment needed is beyond normal - anything more than 1/8 turn on the adjusting nut, the valve has started to stretch abnormally, and the time to replace that valve has arrived.
Exhaust valves are among the hardest working parts of an air-cooled VW engine, and a broken can be disastrous for the engine. When replacing valves, always use the best quality available. We recommend German-made valves, followed by those made in Brazil and Mexico. Using valves made anywhere else, in our opinion, is very risky.