Questions tagged [cylinder-head]

Cylinder heads (commonly just called "heads") are the big piece of metal which caps and seals the end of the cylinder bore.

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Effects of intake valves leaking

I just measured cylinder leakdown rates on my 2007 Tacoma V6. 5 out of the 6 cylinders had retention rates of 75-85% (leaking 15-25%) but my cylinder 4 (left engine bank in the middle) was leaking ...
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8 votes
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Cylinder Leak-down vs Compression Test

I understand that both cylinder leak down and compression tests are used to test for cylinder head, cracks, warps, and gasket leaks. I understand the difference between how each works: compression ...
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6 votes
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This valve is pitted - what options do I have?

This is that infamous Exhaust Valve #3 after cleanup. The cylinder had a history of fuel/spark-related misfires. As the images show, the lip of the valve is pitted. Here is the back of the valve. I ...
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2 votes
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Understanding "torque-to-yield" concept

Can you help me understand the general "torque-to-yield" concept, which is often used for head bolts. In the case of my Tacoma, the head bolts are specified to be torqued to a spec of 27 ft/...
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1 vote
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Physically broken camshaft position sensor

The check engine light on my 2006 Toyota Tacoma V6 went on and, when I did OBDII disagnostics, it turned out I had P0348: Camshaft Position Sensor A. I took the sensor out and it turned to be ...
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