It will fall down into the cylinder, and you are screwed!!! Ok, now, the goal of the operation is to get the spring, keepers and all out of the way, to reach to the stem seal:īut if we take all out, what will keep the valve up? One cup taken out by a strong pick magnet: Valve retainer and two keepers visible. Ok, and on our Mazdas, the entire system is covered by a valve cup, above which the cam lobes operate, pushing the valves down, ergo opening them. Ok, the spring pushes against the valve retainer but the retainer can not move coz it has been locked by two small tapered valve keepers that are locked into the small groove at the end of the valve stem. Try to realize the 101 on the system, coz it is essential!!! The end of the spring pushes against the end-cone plate that has a tapered hole in which two small retainers sit, holding the bunch in place. Valves are held closed by a strong (and i mean one badass strong coil spring). Yes, to start with the procedure, but how will you be able to adjust the belt back on the cams once you are done without being able to see the crankshaft notch, and especially if you need to rotate the pistons up and down while replacing seals?Įrgo, you need to take apart the belts, covers, crankshaft pulley. Well, one might ask: why then taking all apart, shouldn't just the head (valve) cover and upper plastic cover be enough? Take apart the entire assembly (belts, covers, pulleys) as you were about to change the timing belt, as I wrote in the DIY topic next to this one, EXCEPT you just have to take the timing belt off the cam pulley to take the pulleys off, to take the cams off. (do the test for a couple of mornings, just to be on a safe side)įirst, you have to get a new set of seals (intake and exhaust seals ARE different) and and a pair of cam seals, as you will have to take the cams out of the head.ġ. One "on the fly" way of checking the stem seals is to take the spark-plugs out in the morning on a cold engine, and using a flashlight try to get the pistons in to TDC and look at them, if one or more appear to be wet (oily), -> BINGO you got your selves a leaking valve stem seals. The reason being that depending on the position of you cam(s) when your engine stops, the problematic valve(s)-seals stay opened or closed, so the oil does or doesn't leak into the chamber. The other symptom might be that id doesn't smoke every morning, or at least not as much all the time. Then it means, your head gasket is ok, but your valve stem seals aren't.
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