M62 Cam timing graph - Page 2

David.X5 · #1 02-17-2016, 06:27 PM

Sounds like rod knock to me. It comes and goes a little when you change rpm. Hope you get it sorted out. Did you look in the oil for bearing/metal flakes?

David.X5 · #2 02-18-2016, 06:57 PM

I had a vision. There are check valves behind the vanos solenoids. I'm betting they are in backwards, preventing the vanos from getting oil and the other tensioner from compressing.

Good news is they can be removed/checked without removing the front cover

CapeX5 · #3 02-18-2016, 09:28 PM

David-I like the way you are thinking, outside the box. But, I have had them out a couple of times and they are good. Keep the ideas coming. The cam rings arrived today, will be installing tomorrow.

Quote:

Originally Posted by David.X5

I had a vision. There are check valves behind the vanos solenoids. I'm betting they are in backwards, preventing the vanos from getting oil and the other tensioner from compressing.

Good news is they can be removed/checked without removing the front cover

CapeX5 · #4 02-20-2016, 06:07 AM

So, I think I may be finally coming to some conclusion with this issue. I took the bank 2 covers off to replace the sealing rings on the cam. While doing that I also needed to replace the oil pan. With that off, I looked up into the motor and saw major scuffing on cylinder #5. You can feel the grooves with a screw driver. Even though I had 140LBs of compression, I am thinking this is the cause of my noise. Piston slap. I found a wiring issue on that coil connection a while ago. The plug was all fouled due to it not firing consistently. I think the cylinder was getting washed with fuel and destroyed it. So, out the engine comes and try to find a decent used one or build another out of 2. I have found a short block and complete X5 motor that had some "timing chain" issues. May just get both of those, evaluate and make one good one. The hours I have put into this thing……..

X53Jay4.8is · #5 02-20-2016, 11:01 AM

Quote:

Originally Posted by CapeX5

So, I think I may be finally coming to some conclusion with this issue. I took the bank 2 covers off to replace the sealing rings on the cam. While doing that I also needed to replace the oil pan. With that off, I looked up into the motor and saw major scuffing on cylinder #5. You can feel the grooves with a screw driver. Even though I had 140LBs of compression, I am thinking this is the cause of my noise. Piston slap. I found a wiring issue on that coil connection a while ago. The plug was all fouled due to it not firing consistently. I think the cylinder was getting washed with fuel and destroyed it. So, out the engine comes and try to find a decent used one or build another out of 2. I have found a short block and complete X5 motor that had some "timing chain" issues. May just get both of those, evaluate and make one good one. The hours I have put into this thing……..

How many miles on the original engine do you have? In any case scored piston walls is a no go. 4.4 engines are plentiful just check the timing guides of the replacement engine and re-seal before putting it back in. Your a pro now.