Hey All, here is my short backstory. Rebuilt my '91 300 SEL Gas M103 engine both head/valve and block recently. Installed the timing chain tensioner incorrectly, fully extended which ate threw it's rail within 20 minutes of engine operation (lessons learned, eh? ). Before the timing chain snapped the engine ran like a sewing machine.. nice, quiet and smooth. Perfect.. well until you know.
So having bent 4 valves (that's another story) it required head to come back off. During re-install I tilted the intake manifold up on the front edge tip to pick it up and out ran which appeared to be old dirty crankcase oil out of the #1 pipe. It had the same type of viscosity of oil but naturally with a fuel odor. But unlike just fuel, that stain on the garage floor did not evaporate like gas would alone but remains like an oil stain. There was no evidence of blown rings, gaskets or any other reason for the presence of this fluid in the intake manifold I can think of. I'm praying its just the carbon buildup that's dissolved in the trace fuel that ran out but its slippery like engine oil.
Anyone have any experience with or ever seen this before?
Thanks,
Rick L.
So having bent 4 valves (that's another story) it required head to come back off. During re-install I tilted the intake manifold up on the front edge tip to pick it up and out ran which appeared to be old dirty crankcase oil out of the #1 pipe. It had the same type of viscosity of oil but naturally with a fuel odor. But unlike just fuel, that stain on the garage floor did not evaporate like gas would alone but remains like an oil stain. There was no evidence of blown rings, gaskets or any other reason for the presence of this fluid in the intake manifold I can think of. I'm praying its just the carbon buildup that's dissolved in the trace fuel that ran out but its slippery like engine oil.
Anyone have any experience with or ever seen this before?
Thanks,
Rick L.