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  #1  
Old 03-04-2011, 11:07 PM
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Default #8 hitting the head

need some help my #8 piston is hitting the head. has anyone had this happen? what should i don?
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Old 03-04-2011, 11:27 PM
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How have you determined it is hitting the head ??
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Old 03-04-2011, 11:29 PM
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How do you know the piston is hitting the head ?
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Old 03-05-2011, 12:20 AM
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I highly doubt that (barring any abnormal use) your piston is hitting your head. its ver very unlikely. While the distances are INCREDIBLY close by human standards (less than a human hair thinkness), they are NOT touching. You would know it if it was hitting the head, because your engine would be destroyed. There are only a few ways this happens, all of which result in catastrophic engine failure. Unless you are a qualified mechanic, or at the very least, well versed in the Internal Combustion Engine and its workings, you are not gonna know where your tapping/knocking is coming from.

That being said, the ONLY way I could see you having a piston hitting the head and your engine isnt toast, is if your timing chain is stretched causing your timing to be ever so slightly off (happens after hundreds of thousands of miles of heavy use), or your piston connecting rod has stretched slightly, causing your piston to come high up on the exhaust stroke than tolerances allow. With tolerances we are talking Microns, not Milimeters, so theoretically, it is possible. Just incredibly unlikely. I have been wrenching since I was 15, and I have only seen it happen 1 time, and the engine had 420k on it (1990 Lexus LS400).
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Old 03-05-2011, 05:24 AM
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ill have to get pics. the reason i say that is the motor is takin apart the heads are off. the pistons are all black. but on #8 there is a moon shape shine, and in that same spot the head is dull, and looks as it has been beat on. i took the motor apart because it was knocking found out the timing chin tencheners was busted. also found out that the person who owned it b4 i used block sealer on it. i will get pics of it and post later to day.
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Old 03-05-2011, 10:32 AM
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What you have is valve to piston contact on the intake valves. The 4.7 tolerances are very tight and being just one tooth off on the valve timing will cause the intake valve to hit the piston and bend the valves. If the head isn't damaged, you can install new valves and reuse it.
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Old 03-05-2011, 11:23 AM
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Okay, now it makes sense.... I didn't know you had it torn apart. LOL

I'm with RamTech on this. He has likely forgotten more about the 4.7 in the last day than I've even known about it.


Good luck with your repairs, and keep us posted.
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Old 03-05-2011, 12:50 PM
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how do i download pic on to this site?
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Old 03-05-2011, 02:07 PM
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it is not really hitting the valve technically. you can see the block sealer in the water ports


Last edited by CdnoilRAM; 03-05-2011 at 02:29 PM.
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Old 03-05-2011, 02:35 PM
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Interwesting, wery wery interwesting. It'd have to be one of three things, creep in the connecting rod, deformed crankshaft, or you have play in the crank bearings. most likely is the connecting rod, less likely is the crank or bearings as you'd have more issues with vibration.

Now would be a good time for a stroker kit No, I don't believe they make one for the 4.7L, but it's a fun thought.
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