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The timing chain is tensioned by a hydraulic tensioner inside the timing case that works off oil pressure. Could be sticky or worn. That would be my first guess.

Student, You're experiencing one of the common problems with the 404 if it sits for a long time. Between the aluminum head, iron block, brass radiator and aluminum pistons, if these trucks sit in damp for very long electrolysis can run rampant inside the cylinders that have open valves. Joe's...

Hello Johan, Just to add some other vehicles to David's measurement above, I just checked two 404.1s here and they were 7-5/8" and 8-1/8" so looks like you're right in the average. When I used to deal with a lot of these, the 404.1's commonly had transmission problems, especially the fire...

Hello Johan, I have several 404.1's and nearly all of them with the stock fuel pump will surge at prolonged highway speeds. I have put low pressure electric pumps in line as a booster, which solves the problem, or I've put a newer mechanical pump on which also stops the surging. 404's work on a...

Johan, I just saw this post and I have a '65 404.1 TLF-8 with that same exact electric pump on the front tank as it came from Germany. Do you still need a diagram? I don't have one, but I can sketch it out. Strange coincidence, I live about 75 minutes from where those trucks were for sale in...