artim808

Since OM642 doesn't have oil pressure sensor can I make a hole to the oil filter housing cap, attach oil pressure gauge to the hole and check the pressure there? Or it will be inaccurate?

artim808

Ok I found the answer. According to WIS that's actually proper way to measure the oil pressure on OM642. Attached WIS document just in case someone else want to do it.

GoodByeHonda

I'd like to hear the opinion of others on this issue but I don't think it's a good idea to drill a hole in the plastic filter housing. There is a lot of vibration ... not as much as on a gas motor but may be just enough to crack.
Many thanks for the document you attached. I searched the part # 642 589 00 91 00 thinking that perhaps it's a metal version of the filter housing but it's not, it's just a test metal cap with a port?

https://www.tradera.com/item/343611/...2-589-01-91-00

artim808

If you want just to check oil pressure I think drill hole to plastic is ok. Obviously this can't be used for driving. I ordered new housing for $40 which I will modify and use for checking oil pressure and I will keep the original housing without modification for driving. I don't know whether original mercedes tool is metal or plastic, but link you sent is different tool.

GoodByeHonda

My bad with the link to the wrong part. What is the best place to tap into the OM642 block for the purpose of measuring oil pressure while driving? I'll be getting ScanGauge II for monitoring my dpf regeneration and thought it would be a good idea to have oil pressure as one of the parameters the gauge would display.

artim808

Maybe hole to filter housing (bottom metal part) will work for you? How you will connect pressure sensor to ScanGauge II? There is input connector for additional third party sensors?

GoodByeHonda

I'm not sure if scan guage II will allow for this input. I'm in the process of data logging and hoping this can be accomplished with external sensor.

kajtek1

Any OBD scanner will read only what car computer will show.
You'd have to program new gauge to car computer for it to potentially show.

Plutoe

Don't be super foolish and drill,if anything by a tester cap and do the measurement yourself.
PS: That BS scan tester cant read the oil pressure because there is no electronic sensor to read---waste of money

GoodByeHonda

ScanGuage told me to run it for 30min and tell them 4 parameters I want to monitor. Perhaps oil pressure is possible. Hoping here... I dont need exact pressure but a warning when it passes low level threshold would suffice.
Back to the original topic

artim808

If the pressure sensor is not connected to ECU then you will not be able to monitor oil pressure with ScanGauge. ScanGauge can read values only from sensors which are connected to ECU. Unfortunately there is no way for us to connect oil pressure sensor to ECU. New cable harness and custom ECU firmware is necessary for that sensor to make it work.

Joseph~

The tester cap List Price: $316.80 at dealer as of 12/31/2019

Piotr Malecki

Hi
Can maybe any one tell what is the reall oil pressure you got in this engine ?
I made a test in my engine and when hot I got 0.3 bar so like in WIS but Im wondering if it not should be a bit more ?

Piotr Malecki

Hi
Can you tell me result of oil pressure in you engine you got? Many thanks

artim808

I don't remember exact value but I believe it was more than 0.3 bar. What's your pressure at 3000rpm?

Piotr Malecki

first tester was bad and generally now at hot engine pressure is 1bar and at 3000rpm pressure is more like 5 bar 5.4 if I good remember. I rebuild all engine because broken that is why I'm worry now and looking for some one who know what pressure test showed for real.

peter2772000

+/- 15 psi at idle and almost 60 psi at 3k rpm. I'd say you have nothing to worry about.

Piotr Malecki

Thank you for your answer so looking my is even a bit better like I have more pressure at 3000rpm 😁 if you can tell milage of your car? What oil do you use?
Once again many thanks

peter2772000

Don't base your oil selection on me, I'm kinda like the rebel on this forum.

Piotr Malecki

Ok 😁 I only would like to know what oil you use that pressure is like it's? I have 5w40 oil now and also wondering about mileage of your engine ?

peter2772000

Our Bluetec presently has around 40k miles. I run 5W30 in the winter and 20W50 in the summer. I run high-zinc level oil from Amsoil, replaced the OEM oil filter with a bigger spin-on version

I have:

- Removed the DPF
- Deactivated the DEF
- A tune which deactivated the EGR

As far as oil pressure goes, I don't know what oil pressure our engine has. But I wrenched on cars for many years when younger and the pressures you mention seem good to me.

Piotr Malecki

you are then like me 😁 my car also has removed DFP EGR also off and I made remap in ecu and instead od 235hp now it has 260hp 😁

peter2772000

Geez, we may be brothers of another mother......

I didn't go for a performance tune (which isn't like me) because I'm more preoccupied with this truck lasting a long time.
How long ago did you make the mods and are you happy with them so far?

artim808

Hi Peter, What's your oil consumption? Do you see any difference in oil consumption with 5W30 vs 20W50?

peter2772000

I replace the oil every 5k miles and have never had to add oil, regardless of type.