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Yikes! Bad problem indeed. Are you using a torque wrench to install plugs correctly? Has engine been modified? Was this happening with prior head? Once a plug has been blown out head threads should be inspected very carefully for damage. Are you using anti-seize on plugs? Are you careful to only remove plugs when engine is dead cold (off overnight)?
The m43 engine should be similar to both the m42 and m44. The cylinder head torque settings are 22ft/lb and 90degree torque angle, and another 90 degree torque angle. Make sure to wait approximately 10minutes before performing the 2nd torque angle.
You said E30, 320i correct? Your engine is a 2.0L 4 Cylinder engine? If so it does not have a timing belt, it has a chain, upper and lower gears and two chain slides. To change the timing chain and slide set is not easy if you have never done one, neither is the belt on the 6 cylinder engines. I recommend a reputable BMW shop.
The engine in an E30 325i is not the same as the E36 328i. the 325 has a 2.5 litre engine and the 328is has a 2.8 litre engine. They are from a diffrent era. The engine in the 328i Has the engine code M52 and conpletely redesigned.
Cyl head to lower timing chain cover10nm (89in – lb)
The tightening sequence is from inside to outside crossover as normal. Loosening sequence is from outside to inside crossover. Remember to set torque wrench at low setting and work gradually up through the whole sequence until you get the desired torque.
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