Re: Fixing/servicing a DOHC speedometer

Posted by sgtslag on May 17, 2012; 3:50pm
URL: http://vintage-and-classic-hondas.81.s1.nabble.com/Fixing-servicing-a-DOHC-speedometer-tp3891671p3999300.html

Well, considering the tachometer cable is not sealed (as far as I can tell), and the oil pressure maxes out at 72 PSI (on DOHC's), I am guessing the cable end plugs into a spinning gear, rather than penetrating the valve cover.  That 72 PSI can really throw a jet-stream of oil!  When I put my oil cooler on, initially, I used worm-gear hose clamps (later replaced with T-bolt hose clamps):  there was a thin jet-stream of oil that shot straight down, past the hose clamps, onto the ground, creating a rapidly growing puddle...  I believe the same would happen were the cable to plug into the header cover, as the cable would then be subjected to the oil pressurized within the engine.  One way to find out, is to pull the cable, start the engine, and see if I get a geyser.


My thought in bringing it up is that my tachometer needle really jumps around.  Perhaps if I clean it out, then re-grease it, it might settle down a bit?  Cheers!