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RPi3 overheating

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DaOld Man:
I have a RPi3 in a genesis console case. I threw this together last year but its been gathering dust so I decided to drag it out and test it.
After a little while of playing it gave the thermometer in the right corner of the screen icon, which means overheating.
I had installed one of those cheap heat sinks with the double sided thermo tape.
I dont know if the tape broke down over time or what but it was definitely not doing the job now.
I removed that hinksink and installed one made for a power transistor.
I applied heat sink compound between it and the cpu.
I used a hot glue gun to attach the heatsink to the board.
It ran much cooler. No thermometer warning and I used winscp to check the cpu heat. Its running about 60-72 degrees C.
But the hotglue I used is melting. I looked up specs on the glue and it becomes soft around 70 C.
So any suggestions how to fasten this heat sink down?
I wish RPi would at least make holes in the board so you can attach a real heatsink.
Here is a pic of the glued in heat sink:

mahuti:
I can't tell you exactly how to fix this particular issue, but I can tell you that a lot of the cheap heat sinks don't actually come with the right tape. They often come with a double sided tape that will stand up to the heat but isn't actually made for applying heat sinks. That kind of tape doesn't help with the transference of heat, but instead insulates, which makes the processor hotter. When I buy heat sinks for the pi I make sure they come spec'd with the right tape... and at some point I bought a roll of it myself just to have around.

Even without a heat sink, a small fan driven off the GPIO will work wonders.

For an Emby movie server I bought a small heat sink tower/fan combo that mounts to the pi in the corners. Man, that thing does an AMAZING job at keeping the heat down, even during big transcoding and movie processing operations.

Vocalitus:
Yep I had the same problem but I found this solution that worked and now my temps are low.  You might need to mod your enclosure.

You could also get one of these and fill it with mineral oil.  Makes a nice conversational piece. 

Looks classy and you can over clock the heck out of that Pi.  Plenty of videos on the web for examples.

 

DaOld Man:
Thanks for the suggestions guys. I like that one with the case and 2 fans.
Im not a big fan of fans. (no pun intended), but if what I just tried doesnt work I will probably go that route.

Heres what i have going on so far.
Since that transistor heat sink appears to do the job, just the hot glue is not the right approach, i tried a different mounting method.
I first tried to chip off the hot glue blobs, but it was pretty tough and i was afraid I would damage the board, so I left them on for now.
I fashioned a paper clip to run between the two back mounting posts and through the heat sink.
It is applying a spring like tension against the heat sink.
Going to let it run awhile to see how it works out.
Heres a couple of pics.





I havent run winscp yet to check temps, will post the results after the Pi runs for awhile.

DaOld Man:
Here are my test results.
Running Attract Mode V0.5 build 23-08-2016
RPi is NOT overclocked.
Ambient temp is 66-68 degrees F.
All following temps are in C.
Using Winscp from desktop windows 10 PC.
Using command in winscp terminal mode: vcgencmd measure_temp

07:42 AM (Genesis case top is off): 62.8 C
07:52 AM: 59.1 C
Ran SNES emulator for 14 minutes
08:06 AM: 62.3 C
Put genesis case top on.
08:30 AM: 66.6 C
09:00 AM: 63.4 C
Playing N64 emulator, trying to stress CPU for 15 minutes
09:16 AM: 74.7 C
09:24 AM: 77.4C
Highest temp Ive seen is 77.4. The thermometer icon never popped up.
I plan to let attract mode menu screen run for a while and check again.
Looks like its going to be ok, but time will tell, plus ambient temp is fairly low. My furnace kicks on at 66 off at 68 F. (It lowers at night to 62-64)

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