I have found a way to fix the valve train noise on the 603 engine, with this
mod the engine runs incredibly smoother and I believe has also increased
what you do is remove the oil filter cover and on that cover is a tube with
two orings on it, inside this tube is a small regulator valve, near the top
of the tube is a small hole with the oil flowing from the small hole to the
oring end, you need to drill that hole out bigger to allow more oil flow to
the hydraulic lifters etc., I drilled it out to 5/32",make sure no metal
pieces get into the valve and clean it out with solvent and compressed air
blowing from the hole to the oring end.
the cost is nothing and you can do it next time you change the oil, you will
not believe how much smoother the engine will run
Bad idea dude.
This will probably provide too much oil pressure during highway
driving, either emptying the oil pan, or causing a bunch of leaking...
The whole was that size for a very good reason...
PS Maybe you could add some chain saw oil instead?
I have been a diesel mechanic for 35 years, I would not do something like
this without thinking first
the 603 engine has had many service bulletins for noisy lifters since new
with many lifters replaced under warranty until finally Mercedes said that
noisy lifters were normal
I am only making the hole slightly larger, it has no effect on oil pressure
the oil pressure is the same, it is only increasing a bit more oil to the
lifters, a very small percent of what the oil pump pumps
if you like noisy lifters I would suggest that you should not try this!!
PS I would also suggest you to use a drill instead of a chainsaw??
The purpose of the hole you refer to is to bleed ait trapped in the filter
housing back into the oil pan. It does not provide oil to the valve train.
Perhaps if the bleed circuit is blocked some air could be forced into the
oil pressure system and on to the valve train.
You could be right about the hole used to bleed air from the filter but if
the valve train is no longer noisy the end result has to be more oil
supplied to the valve train, the bleed hole was not blocked before I drilled
the hole larger, but you can blow air though the tube easier know than
Motorsforum.com is a website by car enthusiasts for car enthusiasts. It is not affiliated with any of the car or spare part manufacturers or car dealers discussed here.
All logos and trade names are the property of their respective owners.