1983 300D engine with a 1984 300SD IP.

The PO removed and reinstalled the IP. This thread makes no mention of what to do if the assembly of the IP to the engine is incorrect and the drive splines are misaligned by one or two teeth.

I took the car to a very experience mechanic to time the IP. He pulled/adjusted the top of the IP towards the fender well (retarding the timing) AS FAR AS IT WOULD GO.

The current symptoms are:
1. Engine bucks hard when first started at cold idle, about 700-800 rpm. Runs more smoothly when cold when throttled up to ~1000 rpm.
2. White smoke when first started. Goes away when warm.
3. Runs smoother when warmed up, especially when throttled up to 1000 rpm, or trans is put in Neutral.


Did I give enough info above to diagnose the problem and get an answer on what I should do?

Thanks!

__________________
.
1st MBz: 1982 300SD
2nd MBz: 1987 300SDL
3rd MBz: 1995 S420
4th MBz: 1987 190DT
5th MBz: 1984 300SD w/1983 300DT engine
6th MBz: 1999 C230k I'm 3rd owner, got it w/57,235 miles.
and manages Mom's 2007 R320 CDI

.

take the IP out
set 24 degrees on the Compression stroke (2 first lobes pointing upwards)
and line up the IP notches
plunge IP back

timing afterwards is your choice....


I would also check rack dumper and IP dv's.

edit : check if you have code numbered 251 MW IP which has 3 teeth mismarkings...

.

__________________
w126 500SEC gen II euro, powered by OM617 turbo stolen from 84 300SD 2.88 diff,EGR blinded
next wish/project: w114 coupe OM603 powered

When removing the IP is it possible to see if the "IP notches" are correctly aligned before the splines are completely disengaged?

If they are aligned properly, and that can be seen, it would be better to not fully disengage them, and just slide and bolt it back together. Then figure out what to do next.

__________________
.
1st MBz: 1982 300SD
2nd MBz: 1987 300SDL
3rd MBz: 1995 S420
4th MBz: 1987 190DT
5th MBz: 1984 300SD w/1983 300DT engine
6th MBz: 1999 C230k I'm 3rd owner, got it w/57,235 miles.
and manages Mom's 2007 R320 CDI

I don't think so but I m not sure...(oil filter is in your way...)
mark the IP position before removal if you are scared of misaligment...
easier is to take bosch number of the IP plate ...see if 251 appears ... like in 0 413 xxx 990

IICR only 1982 pump had those teeth messed up ....but your has been changed so who can be sure which one is plunged in now...?

.

__________________
w126 500SEC gen II euro, powered by OM617 turbo stolen from 84 300SD 2.88 diff,EGR blinded
next wish/project: w114 coupe OM603 powered

The aluminum plate has:
Bosch 011
345 11655
PES 5M W55 / 320RS 16
0 403 245 020
ER0005
6170704.101

__________________
.
1st MBz: 1982 300SD
2nd MBz: 1987 300SDL
3rd MBz: 1995 S420
4th MBz: 1987 190DT
5th MBz: 1984 300SD w/1983 300DT engine
6th MBz: 1999 C230k I'm 3rd owner, got it w/57,235 miles.
and manages Mom's 2007 R320 CDI

what we call the Fuel Injection Pump is actually the Fuel Injection Pump, a Governor and a Fuel Supply/Lift Pump.
Each one has an Aluminum Plate on it with information.

On My Fuel Injection Pump the Plate for the Fuel Injection Pump is right under or near the Banjo where the Fuel enters the Fuel Injection Pump Housing; at the Top Front of the Fuel Injection Pump Housing.

__________________
84 300D, 82 Volvo 244Gl Diesel

And this "very experience" mechanic didn't know what to do next?

From all indications, you have already run out of adjustment on the IP. That means that you need to remove the IP, align the index markings, then reinstall in the middle of the slots. And do yourself a big favor and replace the IP gasket while you are at it.

What purpose would that serve?

__________________
When cryptography is outlawed, bayl bhgynjf jvyy unir cevinpl.

purpose is strictly "DIY begginer" related...


.

__________________
w126 500SEC gen II euro, powered by OM617 turbo stolen from 84 300SD 2.88 diff,EGR blinded
next wish/project: w114 coupe OM603 powered

If you remove the IP, and reinstall it with the splines re-engaged one or two teeth differently, any marks previously made on the outside of the IP/engine interface will be useless.

__________________
.
1st MBz: 1982 300SD
2nd MBz: 1987 300SDL
3rd MBz: 1995 S420
4th MBz: 1987 190DT
5th MBz: 1984 300SD w/1983 300DT engine
6th MBz: 1999 C230k I'm 3rd owner, got it w/57,235 miles.
and manages Mom's 2007 R320 CDI

From pics I've seen, IP splines cannot be one or 2 teeth off. It is keyed, only goes on one way.

__________________
85 300D turbo pristine w 157k when purchased 167,870 July 2025
83 300 D turbo 297K runs great. SOLD!
83 240D 4 spd manual- parted out then junked

[QUOTE=tangofox007;3317458]And this "very experience" mechanic didn't know what to do next?



From all indications, you have already run out of adjustment on the IP. That means that you need to remove the IP, align the index markings, then reinstall in the middle of the slots. And do yourself a big favor and replace the IP gasket while you are at it.



What purpose would that serve?[/QUOTE]

I know; I have been telling Peoplep planning to do the Drip Timing to mark scribe a mark a across the Fuel Injection Pump Flange to the Block so that if People cannot mannage to get the Drip Timing correct at least they can return it to where they started and be no worse off they they were when they bean to Method.

However, that mark has nothing to do with anything if someone removes the Fuel Injection Pump.

__________________
84 300D, 82 Volvo 244Gl Diesel

I did adjust the rack damper, I could do that again.

What is the "IP dv's"?

__________________
.
1st MBz: 1982 300SD
2nd MBz: 1987 300SDL
3rd MBz: 1995 S420
4th MBz: 1987 190DT
5th MBz: 1984 300SD w/1983 300DT engine
6th MBz: 1999 C230k I'm 3rd owner, got it w/57,235 miles.
and manages Mom's 2007 R320 CDI

delivery valves on top of the IP...but I would not touch those before
timing check....that IP retardation would trouble me first...

dont touch IP elements (also on top of IP 2 screw bolted/adjusted) btw

.

__________________
w126 500SEC gen II euro, powered by OM617 turbo stolen from 84 300SD 2.88 diff,EGR blinded
next wish/project: w114 coupe OM603 powered