Wondering what else to look for under there with the engine running slow, and how one would tighten a loose chain guide.

ed

Took off valve cover, checked valve clearances, they were unchanged & dead on or close. Nothing seemed loose, except for a tiny amount of play in the back end of the tube that runs along the top that drips oil on the cam lobes.

Started her up & could not find a source for the noise under the valve cover. But the top of the chain was slinging oil , so had to shut it down pretty quick.

Any suggestions as to what else to look for under there b4 I bolt it back up would be most welcome.

Thanks,

ed

to confirm that your noise is not a connecting rod bearing take out your oil filter and cut it apart,if you have any bad bearing on the crankshaft you will have lots of metal fragments in that filter.
Most simple and least expensive inspection method.Cat has a special tool to cut the top off their large spin on filters just for this purpose.
Many years ago when involved in drag racingwith a blown hemi we removed and inspected the filter after every run,if we found any metal to speak of that was the last run that day!

__________________
Red Green "This is only temporary,Unless it works!"

97 E300D 157000 miles
87 300TD ?141k? miles

Makes perfect sense, will dissect that filter tomorrow & report back.

The upper Timing Chain Guide has a Bolt some ware on it. That is what I tightened on mine.

__________________
84 300D, 82 Volvo 244Gl Diesel

Took it apart, and the exposed pleated portion had nothing, but the part in the can, filled with a wool-like media had an amazing amt. of debris, some of which was kind of shiny & I thought might be metal, but none of it actually was. Nearly a teaspoon full of particles in the first inch of filter media. It was all leaves, twigs, pine needles etc.
Tested each piece with an ohm meter for conductivity, a magnet, & holding up to a light. They were all translucent, & showed no conductivity, I pressed the probes of the ohm meter into each piece really hard to break thru the oily coating.

The black plastic(?) chain guard was tight, chain seemed to be tight enough, tho not sure exactly how to measure that; No loose springs, scored cam lobes, etc.

Could it be prechambers? How to check that? I ordered new heat shields from Pelican in case I need to remove the injectors, but cracking the lines individually showed more or less even loss of engine RPS's, and did not affect the noise. The stethoscope picks up a loud beat on the metal lines.

Something else inside the block? No well defined place on the block where the noise seems especially loud.

Still thinking I should lower the oil pan while I have it drained and the new gasket I ordered from Pelican on hand, but not sure exactly what to look for besides metal shavings.

Perplexed in Lake Worth.


ed