m80
MB Enthusiast
- Joined
- Apr 26, 2015
- Messages
- 5,702
- Location
- Derbyshire, High Peak
- Car
- Viano ex long, 651 2014. S211 646 2009 (till the Gov't drones blow 'em off the road)
I've removed the engine and intend to do 'some' overhaul work to it.
This maybe of interest and use to others with the 639, 651 and even other models, so I'm intending to update as I go.
I'll have questions that many here can help me with and anyone else should feel free to ask for themselves.
My hope is that at completion I can write up a summary, referring back to this thread, and that others can use it to their own advantage.
My 1st conclusion is that this engine is overly complicated and a bitch to work on, certainly in situ. I by far prefer the OM646.
History.
December 2020 with the months grace the Viano failed its MOT on emissions. 3 rev tests the best it could get was 0.39
There was a hint of a puff of black smoke when stationary and revved hard. MOT didn't pick up on that.
Within the month I became aware of sweet smelling white smoke at start up. So coolant. I found coolant within the intercooler at removal. that being on the n/s I concluded it had entered the air route from above, around the intake manifold.
Trying to remove many components in the congested engine bay became unrealistic.
I didn't see that the intake manifold would be possible to remove, and as the EGR feed from the exhaust runs behind the engine, tight against the bulkhead, that too wasn't coming out either.
With other priorities coming out my ears the van sat till I had time.
Now the engine is out, complete with auto box.
I couldn't have done that w/o an engine hoist and a 3 tonne trolley jack (to support the auto box). In fact I've 2 such trolley jacks and the 2nd became useful.
But this is on the drive, with the front of van on axle stands.
This maybe of interest and use to others with the 639, 651 and even other models, so I'm intending to update as I go.
I'll have questions that many here can help me with and anyone else should feel free to ask for themselves.
My hope is that at completion I can write up a summary, referring back to this thread, and that others can use it to their own advantage.
My 1st conclusion is that this engine is overly complicated and a bitch to work on, certainly in situ. I by far prefer the OM646.
History.
December 2020 with the months grace the Viano failed its MOT on emissions. 3 rev tests the best it could get was 0.39
There was a hint of a puff of black smoke when stationary and revved hard. MOT didn't pick up on that.
Within the month I became aware of sweet smelling white smoke at start up. So coolant. I found coolant within the intercooler at removal. that being on the n/s I concluded it had entered the air route from above, around the intake manifold.
Trying to remove many components in the congested engine bay became unrealistic.
I didn't see that the intake manifold would be possible to remove, and as the EGR feed from the exhaust runs behind the engine, tight against the bulkhead, that too wasn't coming out either.
With other priorities coming out my ears the van sat till I had time.
Now the engine is out, complete with auto box.
I couldn't have done that w/o an engine hoist and a 3 tonne trolley jack (to support the auto box). In fact I've 2 such trolley jacks and the 2nd became useful.
But this is on the drive, with the front of van on axle stands.