85 380 SE oil change question

[roy wood]

i've read elsewhere about 420 - 560 v-8's that after changing oil and before
starting engine you should disconnect the coil wire, ground it, and turn the
starter to build up oil pressure for the chain tensioner to help prevent jumping
a tooth. i don't see any reference to this procedure in the MB manuals on the
380 SE, and i'm wondering if it applies to this engine or just the bigger boys.

i've searched the forums and haven't come up with much under oil change, coil wire, and model. maybe i'm just not using the right words to search. and i
thought i had the oil change part down pretty good.

thanks for any help you can spare, and seasons greetings to all!

[roy wood]

gee, guess i stumped everyone.

[sixto]

There isn't more or less oil in tensioner after an oil change. Maybe after you replace the tensioner, oil pump or relief valve, but not after an oil change.

You can crank the engine without spark to build oil pressure at a lower engine speed than idle but consider the wear to the cylinder walls if unburned fuel washes off the oil. I don't know if K-Jet keeps spraying if the engine doesn't catch.

If you do a search on M116 timing chain failures, you'll find them mostly on the early 81-83? engines, not on the later 84-85 engines. There is basic maintenance to keep the chain where it should be which involves changing the oil at normal intervals and replacing the chain and guides every 100-150K miles. I haven't read in this forum of anyone who cranks the engine after an oil change to build oil pressure to prevent the chain from skipping. Maybe that's why you can't find it in the archives

Sixto
95 S420
87 300SDL

[manny]

Here is a " generic " answer for you.
If you drain the oil overnight, then it may not be a bad idea to use the procedure you mentioned.
However, if you drain the oil & refill the crankcase within an hour or two, I would not consider this a worthwhile exercise.
P.S. Responses are probably a little slow around here when somebody sees a topic related to oil.

[roy wood]

thanks guys. sounded kind of unusual to me. just wanted to make sure
i wasn't skipping something.