Hello All,

Just got my dad's 300SD back on the road after having the turbo rebuilt.

Some other things we did:
-New Lemforder Motor Mounts
-New fuel filters
-New air filters
-New MB breather tube
-New valve cover gasket
-New turbo drain tube and seals
-New oil pan gasket
-New oil strainer
-New turbo u-pipe and seals (still to be installed)
-New rack dampener bolt

Photos!

The rebuilt turbo...
http://imgur.com/a/6n8Di#0

Removal and Installation...
http://imgur.com/a/aCk8a#0

I am still getting some rough idle vibration out of it. I've tried adjusting the rack dampener but that made no difference.

I am wondering if this might be an injector related problem. I few years ago I put new injectors nozzles in (monark). They were NOT pop-tested and balanced at the time as the local diesel shop got all pissy with me when I told them I bought them elsewhere. Time was limited so in they went.

So could non-balanced injectors cause idle shaking? If so, can they be pulled and sent out to be balanced at this stage in their life? I do believe Greazzer is our guy on here for that.

-Kris

__________________
Cruise Control not working? Send me PM or email (jamesdean59@gmail.com). I might be able to help out.
Check here for compatibility, diagnostics, and availability!

(4/11/2020: Hi Everyone! I am still taking orders and replying to emails/PMs/etc, I appreciate your patience in these crazy times. Stay safe and healthy!)


82 300SD 145k
89 420SEL 210k
89 560SEL 118k
90 300SE 262k RIP 5/25/2010
90 560SEL 154k
91 300D 2.5 Turbo. 241k
93 190E 3.0 235k
93 300E 195k

Yes, they need to be balanced for a smooth idle. Pull them and send them on...

__________________
Respectfully,
/s/
M. Dillon
'87 124.193 (300TD) "White Whale", ~392k miles, 3.5l IP fitted
'95 124.131 (E300) "Sapphire", 380k miles
'73 Balboa 20 "Sanctification"
Charleston SC

It can. I would have them balanced simply because they weren't in the first place. Every once in a while, I install new nozzles in a set of injectors and they are spot on. Most need a few shims to get the set close to each other.

__________________
1991 F250 super-cab 7.3 IDI. (rebuilt by me) Banks Sidewinder turbo, hydroboost brakes, new IP and injectors.
2003 S430 - 107K
1983 300SD - Tanoshii - mostly restored ~400K+.
1983 300SD - Good interior. Engine finally tamed ~250K.
Monark Nozzle Install Video - http://tinyurl.com/ptd2tge

On some cars, you need to adjust the idle as well as the rack damper bolt, to achieve a smooth idle. I have found that as these cars age, not all are happy to idle at the original spec.

__________________


Mac
2002 e320 4matic estate│1985 300d│1980 300td
Previous: 1979 & 1982 & 1983 300sd │ 1982 240d

“Let's take a drive into the middle of nowhere with a packet of Marlboro lights and talk about our lives.” ― Joseph Heller, Catch-22

I'm going to pull the injectors and send them out to Mark for test/balancing. eaton is right, should do them since they've never been done.

I do wonder how the spring in that idle adjust screw is doing.

I was getting some oscillations in the idle too.

__________________
Cruise Control not working? Send me PM or email (jamesdean59@gmail.com). I might be able to help out.
Check here for compatibility, diagnostics, and availability!

(4/11/2020: Hi Everyone! I am still taking orders and replying to emails/PMs/etc, I appreciate your patience in these crazy times. Stay safe and healthy!)


82 300SD 145k
89 420SEL 210k
89 560SEL 118k
90 300SE 262k RIP 5/25/2010
90 560SEL 154k
91 300D 2.5 Turbo. 241k
93 190E 3.0 235k
93 300E 195k

If I was getting the idle issue both hot and cold, I would focus on the injectors.

If the problem gets worse the hotter the operating temp gets, then it could be either in my experience.

I was taught by a real old-timer that you should adjust the rack damper bolt after at least 15 minutes of highway driving, and then you only have 20 minutes or so to work before you need to repeat the cycle. I have adjusted mine in mall parking lots, a pawn shop parking lot, etc. If you can't get a sweet spot, experiment with nudging the idle up just a bit.

The '83 SD I had only briefly before I got creamed by a driver blowing a red in it, drove me half nuts trying to set it up (even with the new style bolt). I eventually realized it was only happy idling slightly fast and even then I had to get the bolt adjusted just so.

__________________


Mac
2002 e320 4matic estate│1985 300d│1980 300td
Previous: 1979 & 1982 & 1983 300sd │ 1982 240d

“Let's take a drive into the middle of nowhere with a packet of Marlboro lights and talk about our lives.” ― Joseph Heller, Catch-22