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RE: '76 240d Smokes only on decel

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RE: '76 240d Smokes only on decel - 4/16/2008 11:50:46 AM   
danpayton

 

Posts: 32
Joined: 7/18/2006
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I checked the CCV system... no major oil leaks there...  yesterday I poured in a can of seal expander...  and today on the freeway on normal decel... no smoke!  engine braking still produces the cloud...  but normal driving dosent!  so thats good news!

This motor dosent seem to have ANY blowby...  there isnt anything coming out of the oil fill cap, or the breather tube on top...

I took the intake hose off, and saw somthing weird...  there was a little copper pipe flattened, and jammed into the hole where the vacuum line attaches (the one that goes to the ip)

see pic...

whats up with that??

I still have the creeping idling problem... but if i push in the engine control knob halfway.. the idle returns to a normal level... and stays that way, till i pull it back out.  is there an adjustment spec for the cable that connects to the pump?  how do I know where it needs to be set at?

thanks again all :^)

-Dan

(in reply to danpayton)
Post #: 11
RE: '76 240d Smokes only on decel - 4/16/2008 3:21:19 PM   
danpayton

 

Posts: 32
Joined: 7/18/2006
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fixed it!!!  there was a problem with the vacuum line that goes to the IP... now it idles like it should... (mostly) good enough for me!  thanks!

-Dan

(in reply to danpayton)
Post #: 12
RE: '76 240d Smokes only on decel - 4/18/2008 2:51:16 AM   
ForcedInduction



Posts: 731
Joined: 5/20/2006
From: Federal Heights, Colorado
Status: offline
Was it that copper tube? That would definitely affect your idle since that venturi is what controls the pump governor.

How about the deceleration smoke?

_____________________________

1980 240D 3.0VNTi 216K Miles. OM617.95, GT2256V VNT turbo, 4-speed manual, Intercooler, 3.46 diff, 15mm rear swaybar, ALDA removed, no EGR and Amsoil by-pass oil filter. Currently 107HP and 195lb/ft of torque at the wheels.

www.youtube.com/Turbo617

(in reply to danpayton)
Post #: 13
RE: '76 240d Smokes only on decel - 4/18/2008 10:32:58 AM   
danpayton

 

Posts: 32
Joined: 7/18/2006
Status: offline
Well now im not so sure.... I took out the copper tube, and the idle shot way up to like 2000 rpm.  I put the tube thing back in there, and it went back down....   but its still not like it should be...  I was thinking that the governor worked off of vacuum... but maybe not?

I check the tube for dirt, and everything looks fine...

I am convinced this is the problem with my creeping idle.  but i dont know how to fix it!

as far as the smoke on decel...  sometimes after driving on the freeway for a while it will do it, and sometimes not.. but DEFIANTLY dosent do it as much with that copper tube removed...(less vacuum!)

HELP!!  no venturi!!  make my car idle!!

one other thing... on the top of the IP pump there is a red screw on plastic cap... and under it is just a giant threaded hole into the IP... is that normal? or is something else supposed to be there? there's german writing on the cap...

the only reason im screwing with this car, is the motor runs really well, and seems to have a lot more power than it should...  and there is ZERO blowby..  the valves wernt really even out of adjustment... seems like it dosent have "too many miles" on it

thanks!

(in reply to ForcedInduction)
Post #: 14
RE: '76 240d Smokes only on decel - 4/18/2008 2:19:48 PM   
ForcedInduction



Posts: 731
Joined: 5/20/2006
From: Federal Heights, Colorado
Status: offline
quote:

ORIGINAL: danpayton

Well now im not so sure.... I took out the copper tube, and the idle shot way up to like 2000 rpm. I put the tube thing back in there, and it went back down.... but its still not like it should be... I was thinking that the governor worked off of vacuum... but maybe not?

Maybe you just need to lower the idle RPM setting. I'm not completely sure how to do it on your model but follow the linkage down to the injection pump and see what the linkage stops against. There should be a screw/bolt that can be adjusted.

quote:

one other thing... on the top of the IP pump there is a red screw on plastic cap... and under it is just a giant threaded hole into the IP... is that normal? or is something else supposed to be there? there's german writing on the cap...


That is the oil fill hole for the injection pump. The pump has its own oil sump that is supposed to be changed every time the engine oil is changed but some people have gone for 20+ yers without ever even knowing about the pump oil. The level plug is about 2/3rds of the way down from the top on the left (drivers) side of the pump, roughly below the #4 injector line. You'll also want to be sure the car is on level ground. IIRC its a 13MM head. You add oil through the top under the red cap until oil comes out the plug hole. Use the same oil as the engine.

The only way to drain it is to loosen the 4 screws of the bottom plate and let the oil slowly drain out.

_____________________________

1980 240D 3.0VNTi 216K Miles. OM617.95, GT2256V VNT turbo, 4-speed manual, Intercooler, 3.46 diff, 15mm rear swaybar, ALDA removed, no EGR and Amsoil by-pass oil filter. Currently 107HP and 195lb/ft of torque at the wheels.

www.youtube.com/Turbo617

(in reply to danpayton)
Post #: 15
RE: '76 240d Smokes only on decel - 4/20/2008 10:45:18 AM   
danpayton

 

Posts: 32
Joined: 7/18/2006
Status: offline
thanks for the IP oil info.. never knew!

as for the venturi on the ip gov.. when i apply a vacuum to the tube.. the car idles down just fine...  do i need to replace the throttle body or something?  its not getting a good venturi / vacuum effect going to the IP.. i checked the yellow hose... no cracks or anything there..

thoughts?

thanks!
-Dan

(in reply to ForcedInduction)
Post #: 16
RE: '76 240d Smokes only on decel - 4/20/2008 8:03:37 PM   
ForcedInduction



Posts: 731
Joined: 5/20/2006
From: Federal Heights, Colorado
Status: offline
Bear with me, this is a long post.

Dieselmotor einregulieren
Benötigtes Werkzeug


* 8, 10, 13 mm Maulschlüssel
* Zange
* Kleiner Schlitzschraubendreher
* Meterstab (der gute alte Zollstock)

Übersicht

Diese Anleitung beschreibt das Einregulieren von Mercedes-Benz Dieselmotoren der Baureihen OM615 und OM616, die mit einer pneumatisch geregelten Einspritzpumpe ausgerüstet sind und an einem Klappenstutzen (das Ding mit den vielen Anschlüssen und der Ziffer 4 in Abbildung 1) zwischen dem Lufttrichter vom Luftfilter und der Ansaugbrücke zu erkennen sind. Diese Motoren wurden in den Baureihen W115 (200D, 220D, 240D) und anfangs im W123 (200D, 220D, 240D) verbaut. Spätere Ausführungen mit dem Luftfilter auf dem Motor und ohne Klappenstutzen und die Fünfzylinder-Motoren brauchen nicht einreguliert zu werden.

Die Abbildung 2 zeigt einen Querschnitt durch einen Motor mit pneumatisch geregelter Einspritzpumpe. Das Gasgestänge führt vom Gaspedal an der Spritzwand entlang unter den Abgaskrümmer zu einem Umlenkhebel. Von dort führt eine Stange aufwärts zum Klappenstutzen, der in der Abbildung 2 rechts neben dem mit "Lufttrichter" bezeichneten Bauteil sitzt. Diese Stange ist auch in Abbildung 1 rechts neben dem Lufttrichter und Klappenstutzen zu erkennen, sie führt dort nach unten am Abgaskrümmer vorbei. Von dem Klappenstutzen führt eine Regelstange quer über den Motor zu einem Lagerbock, der auf der Zylinderkopfhaube festgeschraubt ist (siehe Abbildung 4). Dort wird auch der Leerlaufversteller von dem Drehrad im Armaturenbrett angeschlossen. Eine weitere Regelstange führt von dem Lagerbock hinunter zur Einspritzpumpe.

Eine seitliche Ansicht des Motors zeigt Abbildung 3. Die Regelstangen quer über den Motor (Ziffer 2) und vom Motor zur Einspritzpumpe (Ziffer 6) sind zu erkennen.

Einstellung

Als allererstes den Motor normal warmfahren, an einem schattigen Plätzchen abstellen und ein Getränk öffnen. Die nun folgende Einstellprozedur dauert maximal 15 Minuten. Zunächst wird der Seilzug des Leerlaufverstellers an dem Lagerbock auf der Zylinderkopfhaube gelöst. Dazu im Innenraum den Leerlaufversteller ganz auf "niedrig" stellen. Dann die Kontermutter der in Abbildung 4 mit einem Pfeil gekennzeichneten Verstellschraube lösen und die Verstellschraube ganz hineindrehen. Dann unter dem Lagerbock das Klemmstück mit einer Rohrzange festhalten und mit einem Schlitzschraubendreher die Klemmschraube lösen. Das Klemmstück von dem Seilzug abnehmen und zur Seite legen.

Dann die Regelstange, die quer über den Motor verläuft, mit einer Zange an beiden Enden von den Kugelpfannen abnehmen. Die Regelstange, die von dem Lagerbock auf der Zylinderkopfhaube hinunter zur Einspritzpumpe verläuft (sie ist in Abbildung 4 gut zu erkennen) am oberen Ende von der Kugelpfanne am Lagerbock abnehmen. Diese Stange jetzt nicht wild nach oben ziehen, da sonst eine kleine Rückholfeder am unteren Hebel (Ziffer 7 in Abbildung 3) abrutschen kann. Im Zweifelsfall die Feder auf richtigen Sitz kontrollieren, sie verhindert das Schwingen des ganzen Regelgestänges.

Als nächstes wird am Klappenstutzen die Leerlaufdrehzahl des Motors eingestellt. Diese Einstellung erfolgt mit einer gekonterten Schraube, die oben auf der dem Luftfilter abgewandten (also der hinteren) Seite des Klappenstutzens sitzt (Ziffer 4 in Abbildung 5 - die Abbildung 5 ist von halb hinten aufgenommen, etwa aus Richtung der rechten A-Säule). Achtung: Diese Schraube ist im Leerlauf gut zu erreichen. Auf der Unterseite des Klappenstutzens sitzt, zu erreichen wenn das Gasgestänge auf Vollgas steht, eine weitere Einstellschraube. Diese verstellt die unbelastete Abregeldrehzahl und darf nicht verstellt werden! Jetzt also Motor anlassen und mit der Leerlauf-Einstellschraube den Leerlauf so einstellen, daß der Motor gut klingt und bei Automatikgetriebe und Sonderausstattungen wie Servolenkung oder Klimaanlage bei eingelegtem Gang und Lenkbewegungen und eingeschalteten Extras nicht ausgeht. Die Leerlauf-Einstellschraube danach mit der Kontermutter sichern. Motor abstellen.

Die Einstellschraube für die unbelastete Abregeldrehzahl (die in Abbildung 5 mit "Vollast-Anschlagschraube" bezeichnete Schraube, die wir nicht verstellen wollten) wirkt als Anschlag für die maximale Öffnung der Regelklappe im Klappenstutzen. Zur Kontrolle, ob die Regelklappe ausreichend öffnet, den Anschluß vom Luftfilter annehmen (in Abbildung 2 als "Lufttrichter" bezeichnet) und nachsehen, ob die Regelklappe fast, aber nicht ganz öffnet. Eine Lage von 5 Grad zur Horizontalen sollte eingehalten werden. Wenn die Klappe nicht ausreichend öffnet, an der Verstellschraube für den unbelasteten Abregelbeginn einstellen (die Schraube muß dann herausgedreht werden). Diese letzten 5 Grad bis zur vollen Öffnung kosten keine Leistung, machen aber eine spätere Einstellung wieder einfacher möglich.

Abhängig von der Art des Lagerbocks jetzt die eben abgenommene Regelstange, die quer über den Motor verlief, auf folgende Länge einstellen: Bei flachem Lagerbock (frühe Motoren, das obere Bild in Abbildung 6) auf 310 mm von Mitte Kugelpfanne zu Mitte Kugelpfanne, bei gekröpftem Lagerbock (spätere Motoren, das untere Bild in Abbildung 6 oder auch wie in Abbildung 4) auf 317 mm von Mitte Kugelpfanne zu Mitte Kugelpfanne. Zum Einstellen die Kontermuttern an den Endstücken lösen und die Kugelpfannen verdrehen. Regelstange wieder montieren.

Dann wird der Leerlaufversteller montiert. Dazu das Klemmstück wieder über den Seilzug schieben und festklemmen. Dann mit der Einstellschraube (siehe Abbildung 4) den Seilzug so einstellen, daß sich der Umlenkhebel an dem Lagerbock noch eben nicht bewegt. An dieser Stelle muß etwas Spiel vorhanden sein. Der Leerlauf wird also nicht an dieser Stelle, sondern wie eben beschrieben am Klappenstutzen eingestellt. Kontermutter an der Einstellschraube festziehen.

Als nächstes folgt die Einstellung der Regelstange vom Lagerbock zur Einspritzpumpe. Sie hat die Aufgabe, im Leerlauf den Stupser in der Einspritzpumpe zu betätigen, der Drehzahlschwindungen des Motors verhindert. Diese Regelstange war nur oben ausgehägt und ist unten noch an der Einspritzpumpe befestigt. Sie wird jetzt in der Länge so eingestellt, daß sie eine halbe Kugelpfanne (etwa 4 mm) angehoben werden muß, um auf den Lagerbock aufgesetzt werden zu können. Zur Einstellung muß die Regelstange möglicherweise auch unten abgenommen werden, dabei auf die Feder unten achten. Eingestellt wird die Länge wie bei der ersten Regelstange auch durch Lösen der Kontermuttern an den Enden mit den Kugelpfannen. Anschließend die Regelstange wieder aufsetzen und nochmal nach der Feder sehen.

Attachment (4)

_____________________________

1980 240D 3.0VNTi 216K Miles. OM617.95, GT2256V VNT turbo, 4-speed manual, Intercooler, 3.46 diff, 15mm rear swaybar, ALDA removed, no EGR and Amsoil by-pass oil filter. Currently 107HP and 195lb/ft of torque at the wheels.

www.youtube.com/Turbo617

(in reply to danpayton)
Post #: 17
RE: '76 240d Smokes only on decel - 4/20/2008 8:05:38 PM   
ForcedInduction



Posts: 731
Joined: 5/20/2006
From: Federal Heights, Colorado
Status: offline
Rough translation


Diesel engine regulation
Required tool


* 8, 10, 13 mm wrench
* Claw
* Small screwdriver
* Staff metres (the good old customs floor)

Overview

This guide describes the Einregulieren Mercedes-Benz diesel engines the series OM615 and OM616, with a pneumatically controlled injection pump equipped and in a valve nozzle (the thing with the many connections and the number 4 in Figure 1) between the air from the air filter funnel and Ansaugbrücke be identified. These engines were in the series W115 (200D, 220D, 240D), and early in the W123 (200D, 220D, 240D) construction. Later versions with the air filter to the engine and without valve nozzle, and the five-cylinder engines do not need to be adjusted.

Figure 2 shows a cross-section of motor with a pneumatically regulated injection pump. That leads from carburet throttle pedal on the splashboard along in the exhaust manifold to a Umlenkhebel. From there a rod up to the nozzle valve, in the right of Figure 2 with the "air funnel" designated component sits. This rod is also shown in Figure 1 the right of the air funnels and flap nozzle to see where it leads down the exhaust manifold over. From the valve nozzle leads a rule bar across the engine on a pedestal, based on the cylinder head cover is down (see Figure 4). There is also the idling of the adjuster wheel in the dashboard. Another rule Rod leads from the pedestal down to the injection pump.

A side view of the engine Figure 3 shows The rule bars across the motor (Paragraph 2) and the injection pump to the engine (Section 6) are visible.

Setting

First of all, the engine normally warmfahren, in a shady spot off and open a drink. The following adjustment procedure lasts a maximum of 15 minutes. First, the wire of the camp to Leerlaufverstellers Bock on the cylinder head cover solved. These indoor idling the adjustor entirely on "low". Then the nut in Figure 4 with an arrow marked adjusting screw and solve the adjusting screw hineindrehen entirely. Then, under the pedestal the clamp with a pipe wrench and a note screwdriver solve the clamping screw. The clamping pieces of the wire and to decrease side.

Then the rule rod, across the engine runs with a pair of pliers at both ends of the ball pans decline. The rule Strange, from the pedestal on the cylinder head cover is down to the injection pump (it is shown in Figure 4 clearly recognized) at the upper end of the cup on the ball bearing pedestal decline. This rod now no wild upward move, as a small spring on the lower lever (Paragraph 7 in Figure 3) slip. In case of doubt, the spring on the right seat control, it prevents the wings of the entire Regelgestänges.

Next, the valve nozzle the idle speed of the engine. This is done with a gekonterten screw at the top of the air filter comprising (ie the rear) side of the throttle housing sits (Section 4 in Figure 5 - Figure 5 is the back half, roughly from the direction of the right A-pillar). Caution: This screw is idle easily accessible. At the bottom of the throttle housing is to achieve when the carburet throttle at full speed, a further adjustment screw. This adjusted the uncontaminated off and must never be! Now therefore engine, and with the idle adjustment screw the idle so that the engine sounds good and automatic transmissions, and special equipment such as power steering or air conditioning fitted with steering gear and switched movements and extras do not go out. The idle adjustment screw then with the nut. Engine off.

The adjuster for the uncontaminated Cut-off (in Figure 5 with "full-stop screw", screw, which we do not want to misplace) acts as a stop for the maximum opening of the rule in the flap valve nozzle. In order to control whether the rule is sufficiently flap opens, the connection of air filters accept (in Figure 2 as "air funnels"), and check to see whether the rule flap almost, but not quite open. A layer of 5 degrees to the horizontal should be respected. When the lid is not sufficiently open to adjusting screw for the pristine Abregelbeginn set (the screw must be removed). These last 5 degrees up to the full cost no opening performance, but make a subsequent adjustment easier again.

Depending on the type of Lagerbocks now generally accepted as the rod, across the engine ran at length following: For a flat pedestal (early engines, the upper image in Figure 6) to 310 mm from the middle ball to mid-ball pan pan, gekröpftem Pedestal (later engines, the picture in Figure 6, or, as in Figure 4) to 317 mm from the middle ball pan ball to the middle pan. To set the counter to the end pieces and solve the ball pans twist. Rule rod again assemble.

Then the idle adjustor mounted. To the clamp back on the wire and slide festklemmen. Then with the adjuster screw (see figure 4) the wire so that the Umlenkhebel on the pedestal still not moving. At this point, something has to play. The idling is not at this point, but just as described on the flap nozzle. Nut to the adjuster screw tightened.

The next item is the setting of the rule of rod bearing pedestal to the injection pump. It has the task of the Stupser idling in the injection pump to operate, Drehzahlschwindungen prevents the engine. This rule was only Rod ausgehägt above and below is still attached to the injection pump. It is now in length so that they are half a ball pan (approximately 4 mm) to be raised in order to set up the pedestal they can be. To set the rule must also below rod may be removed, while at the bottom of the eighth spring. Added is the length as the first rule Rod also by loosening the counter at the ends with the ball pans. Then the rule rod back on and again after the spring.

< Message edited by ForcedInduction -- 4/20/2008 8:06:31 PM >


_____________________________

1980 240D 3.0VNTi 216K Miles. OM617.95, GT2256V VNT turbo, 4-speed manual, Intercooler, 3.46 diff, 15mm rear swaybar, ALDA removed, no EGR and Amsoil by-pass oil filter. Currently 107HP and 195lb/ft of torque at the wheels.

www.youtube.com/Turbo617

(in reply to ForcedInduction)
Post #: 18
RE: '76 240d Smokes only on decel - 4/22/2008 12:26:59 PM   
danpayton

 

Posts: 32
Joined: 7/18/2006
Status: offline
Ok... That seems to be a guide for adjusting linkages...  I went over it, and everything looks ok on the car...

but for some reason there just isnt a strong enough venturi effect coming thru the throttle body to generate enough vacuum for the IP control line. 

there isnt anything clogging the venturi tube at all... and ive checked the tube for leaks... it holds vacuum just fine. 

Do I need a new throttle body?  or is there a calibration adjustment on the IP for the amount of vacuum in the control line / fuel output at idle?

thanks
-Dan

(in reply to ForcedInduction)
Post #: 19
RE: '76 240d Smokes only on decel - 4/22/2008 10:05:40 PM   
ForcedInduction



Posts: 731
Joined: 5/20/2006
From: Federal Heights, Colorado
Status: offline
You may need a new throttle. There should be a little tube sticking up into the venturi hole, if it is a clear shot through then it has been broken off at some point.

In the worst case, there is a 75 240D in the junkyards here that I could snag the throttle off of for you.

_____________________________

1980 240D 3.0VNTi 216K Miles. OM617.95, GT2256V VNT turbo, 4-speed manual, Intercooler, 3.46 diff, 15mm rear swaybar, ALDA removed, no EGR and Amsoil by-pass oil filter. Currently 107HP and 195lb/ft of torque at the wheels.

www.youtube.com/Turbo617

(in reply to danpayton)
Post #: 20
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