OlderThanMe Posted July 27, 2006 Share Posted July 27, 2006 I got bored today so I figured I would go ahead and pull my E88 off. I was not sure what I would find. Here is the video of the sound of the problem: Here is the video: Here is piston 4. looks like gasket material. You can see some slight scoring marks but I don't think it is too bad. the pistons are flat tops as you can see. look at the bronze color at the far left in the above photo. another shot of the #4 piston. Note the bronze color. I hope that is not oil coming past the rings but I think it is. also see a bit of coolant drips on the cylinder wall but that is just from the head being unbolted and then sitting a few days before pulling the head (I hope) below is the #4 cylinder on the cylinder head. It seems a bit too oily. Look right above the loosely insalled spark plug. fontunately there sems to be very little erosion from engine coolant. Hee is the only damage I could see on the cylinder head. Here is a wide shot of the entire cylinder head. #1 piston on left fyi. Quote Link to comment Share on other sites More sharing options...
veritech-z Posted July 27, 2006 Share Posted July 27, 2006 You thinking that that gasket material was in there before you pulled it? I don't think it would cause the sound you were getting, that was much more metallic in nature. How do your rockers look? (clearly your engine is not stock, by the way, I remember we were all discussing your cam at one point...) Quote Link to comment Share on other sites More sharing options...
big-phil Posted July 27, 2006 Share Posted July 27, 2006 Just floor it and see if the noise goes away, or turn the radio up. Quote Link to comment Share on other sites More sharing options...
big-phil Posted July 27, 2006 Share Posted July 27, 2006 I wonder if its part of the rings? Quote Link to comment Share on other sites More sharing options...
OlderThanMe Posted July 27, 2006 Author Share Posted July 27, 2006 I am still thinking the sound is coming from below the pistons. Those little pieces of junk are gasket because I picked one up and it fell apart. I am thinking that my valves could have some sort of ceramic coating and that is what that white is on the #6 valve. I'll look closer today. The rockers look fine. I'll get a photo of the lash pad today. Some people put bigger valves in heads but I can't see putting much of a larger valve in my head. Maybe 1mm diameter larger each but there would be clearance issues after that. Maybe this is what the "other interior engine work" was that the previous owner was talking about. Of course he said the car had webers on it...lol Cam must be a fairly mild regrind if it even had one. I'll pull out the calipers and try to calculate the lift on it. Quote Link to comment Share on other sites More sharing options...
David K Posted July 27, 2006 Share Posted July 27, 2006 That doesnt sound like any upper end problem to me. It sounds more like a rod knock than anything. Quote Link to comment Share on other sites More sharing options...
OlderThanMe Posted July 27, 2006 Author Share Posted July 27, 2006 yeh. The video says valve knock but I had no clue what the noise was at the time but I know it is under the #4 piston somewhere. It is all going to be redone in my quest for more power. I just want to make sure that nothing in the block is damaged. I'll probably reuse my E-88 but give it a little porting, polishing etc...maybe get my cam reground to a fatter lift while I am at it. I was reading my how to rebuild and modify your nissan OHC engine and there was a mention about asymetrical cam lobes. Is there anybody that can do that on a regrind? Quote Link to comment Share on other sites More sharing options...
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