73 220d excessive smoke on deceleration.

[Kite]

Hello

Trying to get my 220d running good. The first problem is that It has Pretty bad smoke on deceleration and the idle increases as it gets warmer. The second problem that happend after this is That it sat for a year, was driven and then sat another year without ever changing fuel and fluids.

I was thinking valve seals might have been the answer to the first problem?

For the second do I need to drain the fuel tank? Remove injectors and have them serviced? And try to get all the old fuel out of the lines?

Can anyone recommend a good service manual for the engine drive train?
Thanks!

[gmog220d]

Originally Posted by Kite

Hello

Trying to get my 220d running good. The first problem is that It has Pretty bad smoke on deceleration and the idle increases as it gets warmer. The second problem that happend after this is That it sat for a year, was driven and then sat another year without ever changing fuel and fluids.

I was thinking valve seals might have been the answer to the first problem?

For the second do I need to drain the fuel tank? Remove injectors and have them serviced? And try to get all the old fuel out of the lines?

Can anyone recommend a good service manual for the engine drive train?
Thanks!

Welcome to the site!

The best manuals are the original M-B printed books, but they aren't getting any easier to find. M-B printed books for the chassis, and others for the engines. If you look around the 'Bay you'll find listings for CDs that contain scans from the manuals. I have found these CDs to be useful but limited becsaue they don't have everything from the books in them, and what's there can be hard to find.

I think a car that's sat for a year or two probably won't need much special attention before you operate it again. My '74 sits around in the garage mostly, and when I lived in Utah I only put 600 miles on the car in 3 years. I never had any trouble with the fuel. Diesel fuel doesn't degrade quickly like gasoline does. If worried about the fuel pull a sample a have a look, or run it for a bit and watch the pre-filter under the hood for contamination. Worst case scenario would be that you have stuff growing in your fuel, but this is a treatable problem (Biobor). If you live in a dry climate and/or the car is stored inside the chances of this are probably nil.

Lots of smoke on decel and increasing idle speed as the engine warms up could indicate a vacuum leak in the governor. I think you'll find more information by searching this site, but if you have a hard time finding anything speak up.

Check this thread out. It'll help orient you to the pneumatically goverened injection system, plus a few other things:
OM616 on a test stand

[meltedpanda]

are you sure it is smoke and not vapor? Keep an eye on the radiator level and tranny fluid , either ( for a lot of reasons) could be the culprit . If that is the case post back. If not Id would first make sure valve lash (gaps) are to spec and then if that is OK look at seals

[t walgamuth]

Originally Posted by Kite

Hello

Trying to get my 220d running good. The first problem is that It has Pretty bad smoke on deceleration and the idle increases as it gets warmer. The second problem that happend after this is That it sat for a year, was driven and then sat another year without ever changing fuel and fluids.

I was thinking valve seals might have been the answer to the first problem?

For the second do I need to drain the fuel tank? Remove injectors and have them serviced? And try to get all the old fuel out of the lines?

Can anyone recommend a good service manual for the engine drive train?
Thanks!

Valve seals come to mind first.

Welcome!

[Kite]

Thanks! Has there been a post for how to check the valve lash on these? How would you inspect the valve seals for wear?

[Sugar Bear]

Valve seals in REALLY bad condition crack and break but they aren't working long before that. There isn't a way to measure them for wear and at that age be assured they need to be replaced.

The idle increasing sounds like it is burning its own blowby oil fumes as fuel. This is not good as it can lead to a "runaway" over rev situation. Since the car sat for a while it may have stuck rings. With old valve seals and possibly stuck rings all is not lost.

For the rings, with fresh 15w-40 diesel oil and filter, get it hot and run it hard full throttle uphill and full coast downhill. If that doesn't work do a chemical ring soak or better yet do the ring soak first. For the valve seals, replace them and do a valve adjustment at the same time.

Good luck!!!

[Phil_F_NM]

Keep a block of wood handy in case of a runaway and you need to cut the air flow to your engine. Stick it over the intake and the engine will starve.
A runaway is a frightening thing to happen. I had it happen on a VW Jetta and when all was said and done, the prechambers had begun to melt.

Regards,
Phil Forrest