My dryer is overheating and turning off mid-cycle (the dryer is hot to the touch all over). I checked my vent flow and it is solid, all the way through from dryer output to the vent exhaust that goes outdoors. I also cleaned out the little lint that had built up inside the dryer. Here's all that I've replaced so far:
-dryer motor
-timer
-cycling thermostat
-heating element
After replacing all of those, it's still overheating! I tested my thermal fuse and high limit fuse and those have continuity, and they would only cause the heater or motor to run off if they opened anyhow. I also looked at front and rear felt drum seals and they both look intact to me (and not really that worn down or thinned out). However, I did notice there is about a 1/4 inch gap between the drum and the rear wall of the dryer. I think this is allowing hot air to escape the drum and go to other parts of the dryer. I ran the dryer on no heat fluff and had no problems at all. The 1/4 inch gap doesn't appear to be caused by a warped drum or a warped rear wall. Rather, it seems that maybe the drum has settled forward a bit too far inside the enclosure somehow. I've tried several times to make it settle back farther to close the gap but I don't know how to do it. The drum support rollers are in great shape so I don't think they are at fault. The drum is also not tilted downward that I can tell. How can I go about closing that gap?

I'll try that, but will I need to replace my vent hose after that, or will that small hole not be a problem?

The temperature got as high as 163F and then the dryer shut off.

I can run the dryer for over 20 minutes on no heat fluff and everything is fine. The machine doesn't overheat and the load goes through the entire cycle without stopping until the end. I don't think that would happen if the motor was overheating.

I ran a full load and the dryer cut off at around 125F (about 5 minutes in and the dryer felt pretty hot to the touch) according to the thermometer. I tried to restart it but couldn't for about 2 minutes. Then I could restart it and it went until the halfway point and cut off at 127F (this time the dryer didn't feel too hot). I was able to restart it immediately this time. Then it actually went all the way till it was all done. During all of that, I noticed that the temps cycled between 119F to around 140F. This is better than before I replaced all those components, but it would be nice for the dryer to never cut off and never overheat (or for me to figure out why it now does that sometimes).