Quote:
|
Very true however, I've found the most common reason for oil in the intake is due to the Cylinder Shut-Off (CSO) feature. The M137 can shut off the entire left bank under certain conditions to improve fuel economy. This can allow blow-by due to the pressure/temperature differences of the inactive cylinders. Fortunately, the CSO can be de-activated with SDS. If I owned any M137 equipped MB, the first thing I'd do is de-activate CSO. Eventually the oil in the intake will cause ignition mis-fire which will quickly damage the (very expensive) ignition coils.
|
True. However, I have found on most of these motors if the passenger side front cover oil seperator is clogged and not draining, the manifold will fill with
oil faster than anything. See DTB P-B-01.20/13 as follows.
SUBJECT: Models 215.378 and 220.178 with Engine M137
Engine Running Complaints In Conjunction With Blue Smoke and/or Hydrocarbon
Odors Smells During First Start Up
If you receive customer reports in the above model vehicles equipped with engine M137 of engine running
complaints / misfire in conjunction with blue smoke for several seconds during engine first start-up,
hydrocarbon odors during engine first start-up, and/or excessive amount of standing oil in the intake
manifold, please refer to the following cause and remedy.
Cause: PCV (positive crankcase ventilation) System intake assembly (front cover, right cylinder head) oil
condensation drain clogged with oil sludge. Refer to Figure 1 for part location.
Remedy: Remove and disassemble the front cover assembly of the right cylinder head. Refer to WIS
document no. AR01.30-P-5700L, up to and including step no. 14, for R&R of the front cover assembly of the
right cylinder head. Inspect oil condensation drain for clogging (Figure 2) and clean out the oil sludge
blocking the drain. Reassemble and reinstall the front cover assembly of the right cylinder head.
Regards,
DR.D