Hey guys, needing some help that the local dealer can’t help me with. Here’s the back ground.
I’m working on an 89 econodyne with a EM6-300L. When I got to this shop the truck was parked, dropped a valve in number 6 in 2015. Not knowing anything about the history of the motor & noticing scoring in two cylinders from broken rings we decided to do an inframe. So all new pistons, liners, & rod & main bearings, & had heads rebuilt. Put engine back together & set all the valve with Mack’s procedure. Motor started up & ran beautiful! After warming up motor & going to retorque the heads, when I pulled valve covers I found it was dry, very little oil was getting to the top. Probably why a valve stuck & hit a piston. After some reading found the cam bearings being worn will drop the oil pressure to the top. Pulled cam & it was worn pretty bad too. Got new bearings knocked in but couldn’t find a new cam anywhere. A company offered to regrind our cam for $500 so hell yea sent it to them. Once I put cam back in motor & set all the valves again, I noticed that some of the exhaust valves had .115 of clearance if I turn the motor 1/3 backwards after setting them the exhaust valve on that cylinder has .115 of clearance. So I pulled the timing cover off & found to get the #1 cylinder on compression stroke by watching the valves, the timing marks on the cam are 180* from the timing mark on the crank. Shouldn’t #1 be on compression stroke with the marks lined up? I’ve been trying to find a duration number for the cam so I can check it with a degree wheel but can find it anywhere. The local dealer doesn’t even have info on EM6’s just 7 on up. Does anyone know the duration spects for a stock EM6-300L camshaft?
