Hi all, please HELP !
I had to remove my head after the chain tensioner boss cracked and required welding back on (previous owner didn't use a crush washer and over tightened the chain tensioner to stop oil leak !).
The engine was running fine before removing the head and under inspection everything looked very clean. I did not mess with the head at all, apart from welding the boss back on and giving it a good clean/paint.
Put everything back together with the timing correct and cranked it over by hand a couple of times to roughly check.
Engine started first time but sounded like a bag of nails with some noticeable misfiring. I thought maybe the hydraulic tappets needed to fill up so I pored a bit more oil in the head and ran it for a bit at 2500 RPM. This didn't solve anything and the misfiring got worse. Also I stupidly didn't keep an eye on my temp gauge and the engine got pretty hot ! (Air lock in the cooling system, which I then sorted out)
Took the valve cover off and turned the engine over using the end of a screw driver to roughly check compression (didn't have a compression tester). The front cylinder had almost no compression. I cranked it over to dead center leaving all valves closed on the front cylinder. Using a bit of pipe to fit I blew into the cylinder and could feel air escaping from the intake manifold.
So I suppose one or both of the intake vales are not closing properly..... S#!T !
Before I pull the head again does anybody have any suggestions or anything I should try out ?
Thnaks
Topic: M42 Running on 3 cylinders after head replacement (Read 1751 times)