- Joined
- Mar 11, 2013
- Messages
- 10,937
- Location
- South Bucks
- Car
- CLS63 SB, ML63, CLK350 'Vert, Triumph Sprint (Bike not Dolly...),
I took the 2013 CLS 350 CDI in to Terry Gates for a health check yesterday. All fine, no codes, no sign of oil leaks (so the oil cooler seals aren't leaking yet, but they almost certainly will sooner or later...), replaced the duff thermostat and it now holds 90 degrees as it should. The MoT test emissions show that the garage needed four tries to get it through, and it only just passed even then, but I suspect that was because of the low coolant temperature - it was 60 degrees, no higher, on test.
The only slightly worrying thing is that there's a puff of blue smoke on startup after it's been standing overnight. My first thought was valve stem oil seals, but when I mentioned this to Terry, he told me he's never had to replace them on an OM642 which has been properly serviced, and this one has. It's definitely not drinking oil, and there's no smoke at any other time.
Is it possible it had to have the nuts revved off it to get it through the test, and an oil seal has been slightly damaged? I've also seen mention that the top-end engine breather can play up; could that possibly be the cause of the problem?
I don't know much about diesels. Should I be concerned?
The only slightly worrying thing is that there's a puff of blue smoke on startup after it's been standing overnight. My first thought was valve stem oil seals, but when I mentioned this to Terry, he told me he's never had to replace them on an OM642 which has been properly serviced, and this one has. It's definitely not drinking oil, and there's no smoke at any other time.
Is it possible it had to have the nuts revved off it to get it through the test, and an oil seal has been slightly damaged? I've also seen mention that the top-end engine breather can play up; could that possibly be the cause of the problem?
I don't know much about diesels. Should I be concerned?