ryanmcdonald234 Posted June 2, 2015 Share Posted June 2, 2015 Hello from AustraliaI drive a 1992 R series metro liner running an EM7-300 + T2090 tipper truck that has never (in the last 4 years) had a working tachRecently I have tried to get it going, and what I can find so far is:The gauge and cable seem to be fine. I have hooked a drill up to the engine end of the cable and the gauge responds like it should. The problem seems to be inside the 90 degree elbow hooked into the front of the engine in front of the injection pump. Looking in to where the cable connects to the elbow while the engine is running the spline does not spin at all. I removed the the elbow and both ends spin when the other is turned manually, so that part appears to be fine as well.Is there something missing between the engine and the 90 degree elbow? I have requested a diagram from Mack Australia but it's not much help.Anyone know anything about these? Hopefully it's something simple. Could never figure out why the previous driver had disconnected the cable at both ends... Quote Link to comment https://www.bigmacktrucks.com/topic/40299-r686-tachometer-issues/ Share on other sites More sharing options...
mrsmackpaul Posted June 2, 2015 Share Posted June 2, 2015 does it have a little key or shaft thats slides into the back of the 90 degree doohicky that may be broken or fallen out If the 90 degree thingy has the cable off and still in motor can it be turned if so the problem is between the 90 degree thingy and the motor the drive key might be missingPaul Quote Link to comment https://www.bigmacktrucks.com/topic/40299-r686-tachometer-issues/#findComment-292048 Share on other sites More sharing options...
ryanmcdonald234 Posted June 4, 2015 Author Share Posted June 4, 2015 Exactly what I was thinking Paul. I got a techical diagram from Mack and it doesn't seem to show anything in there, gotta go down to the mack shop tomorrow, might remove the 90 degree thingy and show them what the hell I'm talking about. Not sure why my image didn't post with the OP so I'll try againDiagram from Mack Quote Link to comment https://www.bigmacktrucks.com/topic/40299-r686-tachometer-issues/#findComment-292262 Share on other sites More sharing options...
mrsmackpaul Posted June 4, 2015 Share Posted June 4, 2015 the key thingy might be on another drawing showing the timing gears I have never had a problem so I have never had that apart but I would be surprised if didnt have some connection therePaul Quote Link to comment https://www.bigmacktrucks.com/topic/40299-r686-tachometer-issues/#findComment-292263 Share on other sites More sharing options...
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