OM Legacy Engine Used Oil limits and Fuel Dilution
Attached is a basic guide for OM Legacy engine used oil recommended limits for reference.With specific regard to fuel dilution reports of the oil, an OM engines can have fuel in oil reasonably regularly and to reasonable amount dependent on duty cycle / operations and can be quite common for this report from certain customers if they aren’t used to it or already monitoring trends ( typically cranes / light load idling etc) There are a lot of customers that don’t even do oil analysis on these smaller engines so scares an organisation who is used to other engines etc. Note the attached MB guide suggest >7% fuel and more important gives a % of viscosity change from new oil as indicator of concern. It basically has to be a clear cut mechanical fault ie. fuel coming out the dipstick and low oil pressure alarms or you may keep chasing your tail and won’t be able to fix or improve anything mechanically if it is due to operation / duty cycle / maintenance schedules etc.…Note it is very rare for an OM engine mechanical fault causing fuel dilution and typically only reported after something been done ie. from new or following major repair service and o’ring or something pinched. If customer is reporting this concern recommend following be also well reviewed and considered before spending any time reviewing for mechanical faults that may not be present and unnecessarily upsetting customers and operation:- - Compare oil sample results against MB guidelines ie. -25% of fresh oil viscosity either at 40 or 100..(Baseline of actual new oil sample should be used) - Compare trends of customers other units and the unit in question. - Look at wear metal trends as if not increasing or growing can show not causing engine wear etc.. - Review maintenance schedules ie. hours between oil change etc. - Monitor dipstick levels, any oil pressure low alarms etc.
Related Articles
Legacy OM900 and OM500 series blank MR2 part numbers
This Parts information bulletin attached is to identify the latest part number for a blank MR2 control module (AKA a PLD) to be used on the 12/24-volt 900 and 500 series legacy engines. Current part number is EA0074469440. Note: Often when using a ...
Oil consumption as a % of fuel burn
MTU often calculates oil consumption as a % of fuel burn. For example all the series 4000 engines generally are between 0.3% of fuel burn after 100hrs of operation to 1.0% of fuel burn. To calculate this you will need to start an oil consumption ...
new engine Run-In initial oil Daimler / OM and MTU LPR
Daimler manufactered engines ie. OM legacy & MTU LPR models are typically supplied new from factory with oil already providing preservation benefit and is considered suitable as an initial "Run In" oil capable to 1st scheduled service event. Below ...
OM engine oil pan sump plug insert
If ever experience OM engine oil pan drain plug insert leaking or damaged due to whatever causes there is not acknowledged repair process for this and requires oil pan assembly replacement.
Reman OM engine aftertreatment commisioning.
I.There is a requirement for Reman OM engines with aftertreatment systems sold through Penske AUNZ to have the aftertreatment system commissioned by RRPS / MTU. This is completed via VDOK and links to the new reman engines serial number to the ACM, ...