Hi im new to this forum and this is my first tuner. Its a 2002 is 300. Sorry for the long first post but ive done a bit to the car in this last 2 weeks. Ok so when i bought the car i was informed that is had a cam gear leak. So i disassembled practically the whole front of the engine, rebuilt the cam gear reassembled etc. Every thing pretty well went according to plan with a few bumps. Timing belt replaced i only removed one valve cover replaced the seal too. Car never over heated before and now its starts to over heat practically red lines in less then a mile of driving Still leaking oil but not from the cam. I think it may be from crank shaft. What did i do wrong.. any opinions or suggestions. Still pretty new to the scene but i got a good head and alot of personal experience with cars so be nice. Lol. Thanks in advance

Air pocket or thermostat is not working. This is assuming all your sensors and fans are working.

Several possibilities here. If you attempted to replace just the seal in the vvt sprocket, you may still have a heavy leak there. It is a very difficult seal to get right. I would have replaced the cam and crank seals while in there too. So here is how to tell if its a cam crank or vvt sprocket leak. You pull the covers off and see where the oil is. If it is wet all over the place and drenched on the cover and the belt is getting wet, this is from the vvt sprocket slinging oil. If it's not all over the cover but wet down the head and coming out onto the water pump from the side etc, then its cam seals. If it's only wet way down low and coming out the bottom of the front cover only, its the crank seal. All three will leak out the bottom cover obviously. So if it's coming from up high, just change the crank seal to be sure.

As far as overheating, you probably didn't get the cooling system bled right if it's only happening after the job.

....thanks for the advice but cooling system blend? Not sure i understand that part. I do also have a coolant leak still tracking that down most likely the heater core... i ordered the crank seal should be in today already had the other seals which im hoping to replace this weekend. Ill keep yall.posted.

Update!!!! It was the crankseal. No more oil leak!!!. Also tracked down the coolant leak it was the heater core as suspected. I went ahead and bypassed it. So farr all seems to be well!!