Rudy7831 Posted August 4, 2023 Share Posted August 4, 2023 Hi All! My W124 has an OM602 engine, and it's giving me some trouble. From zero, oil pressure takes around 8 seconds to reach operating temperature. As long as the oil pressure is maintained, the engine may be operated normally. I have hypothesized that the issue is a faulty non return valve in the filter housing. I got fortunate and found a new old stock valve; these are no longer sold by the dealer and I had to replace it along with the spring. The issue has not been resolved, unfortunately. We see no progress. I have no idea where to start looking. There is apparently another valve in the block that maintains lubricating system pressure. Can someone provide a hand with this? Definitely appreciate it. Embedded video demonstrating the issue is below. Quote Link to comment Share on other sites More sharing options...
ELGIGANTE Posted August 4, 2023 Share Posted August 4, 2023 Only the cylinder head is different that I'm aware of.In order to access it, however, the cylinder head must be removed. This is a gas-powered motor. In order to facilitate everyone's search, you should have specified diesel. Check this guidebook for answers. Index of the Model 124 Maintenance Guide I knew a man who changed his oil and filter and ran into the same issue...Mann or Mercedes filters only. Quote Link to comment Share on other sites More sharing options...
Rudy7831 Posted August 4, 2023 Author Share Posted August 4, 2023 The fact that OM602 is a diesel engine seems evident to me. Anyway, I appreciate the feedback. Quote Link to comment Share on other sites More sharing options...
TechnoTrailblazer Posted August 4, 2023 Share Posted August 4, 2023 Not so clear; in my 15 years of driving Mercs, I've never seen or heard of an om602. Those in the know, well, they know. 😆 Quote Link to comment Share on other sites More sharing options...
ELGIGANTE Posted August 4, 2023 Share Posted August 4, 2023 A Piece of The Road, It's the models I'm familiar with, not the powertrains. Therefore, I agree with you that the model should be included in the forum post. Quote Link to comment Share on other sites More sharing options...
TechnoTrailblazer Posted August 4, 2023 Share Posted August 4, 2023 Don't fret, my friend. Your intentions are good; I realize that. Quote Link to comment Share on other sites More sharing options...
ELGIGANTE Posted August 4, 2023 Share Posted August 4, 2023 OFTR That's kind of the point.Though it's not always completely accurate. Quote Link to comment Share on other sites More sharing options...
TechnoTrailblazer Posted August 4, 2023 Share Posted August 4, 2023 I agree with you 😉 Quote Link to comment Share on other sites More sharing options...
Gianni682 Posted August 4, 2023 Share Posted August 4, 2023 The problem may lie in the oil pressure sensor. Assuming, of course, that the problem isn't any unpleasant engine sounds but rather the oil pressure guages' slowness to move off 0 bar on start up. My OM602 engined w201 190d, with over 300,000 miles on the odometer, immediately pins at 3 bar upon start up, and the gauge only records a correct pressure reading after it has reached working temperature. MANN oil filters are the only ones I'll use. Quote Link to comment Share on other sites More sharing options...
ELGIGANTE Posted August 4, 2023 Share Posted August 4, 2023 My M103 W124 260E has only ever used Mann oil filters.A genuine Mercedes oil filter was what I used the previous time.Compared to Mann and Bosch, they are noticeably shorter in stature. Quote Link to comment Share on other sites More sharing options...
Gianni682 Posted August 4, 2023 Share Posted August 4, 2023 Oil filters on older Mercedes diesels, such as the OM602, are just an insert rather than a metal cannister, making filters from various manufacturers physically interchangeable. I wouldn't dare use a budget filter (Framm/ Crossland?) in there to save ten pounds. Quote Link to comment Share on other sites More sharing options...
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