Parts Catalog Accessories Catalog How To Articles Tech Forums
Call Pelican Parts at 888-280-7799
Shopping Cart Cart | Project List | Order Status | Help




Go Back   PeachParts Mercedes-Benz Forum > Mercedes-Benz Tech Information and Support > Diesel Discussion

Reply
 
LinkBack Thread Tools Display Modes
  #16  
Old 12-21-2017, 02:41 PM
Registered User
 
Join Date: Aug 2009
Location: MN
Posts: 1,160
Quote:
Originally Posted by torsionbar View Post
The risk is in the foreign part preventing a valve from closing, and then piston collides with valve.
That would be a risk I would be willing to take. The piston would collide with the valve and crush the plastic piece. I do not think that any damage would be done to the piston or the valve.

That said, I would not make that decision on a customer's car or a friends car. I would leave that up to them.
__________________
Greg
2012 S350 BlueTEC 4Matic
2007 ML 320 CDI
2007 Leisure Travel Serenity
2006 Sprinter 432k
2005 E320 CDI
1998 SLK230 (teal)
1998 SLK230 (silver)
1996 E300D 99k, 30k on WVO
Previous:
1983 240D, on WVO
1982 300D, on WVO
1983 300CD, on WVO
1986 300SDL 237k, 25k on WVO (Deerslayer)
1991 350SDL 249k, 56k on WVO - Retired to a car spa in Phoenix
1983 380 SEC w/603 diesel, 8k on WVO
1996 E300D 351k, 177k on WVO

2007 ML320 CDI .. / 2005 E320 CDI .../ 1998 SLK 230 .../ 1991 Daihatsu Rocky
Reply With Quote
  #17  
Old 12-22-2017, 08:02 AM
Bengoshi2000's Avatar
1991 300D 2.5 Turbo
 
Join Date: Jan 2011
Location: NC, USA
Posts: 216
"I would start it and run it."

I've never had any experience with foreign objects in the combustion chamber, removed a head, done a valve job... etc. So take my opinion with a grain of salt...

At the speeds the piston moves, I think that plastic piece could damage the piston head or the valves, valve seats... etc. I.E. I can throw a paint ball at you from ten feet w/ no ill effects... shoot it at you from ten feet... it's going to bruise and break the skin (not to mention the fact that you'll likely lay an arse-whippin' on me shortly thereafter).

I'd exhaust (pun intended) every possible vacuum or other removal options before cranking 'er up.
__________________
1991 300D 2.5
Reply With Quote
  #18  
Old 12-22-2017, 08:23 AM
t walgamuth's Avatar
dieselarchitect
 
Join Date: Apr 2005
Location: Lafayette Indiana
Posts: 33,241
The top of a piston is surprisingly thin and its aluminum so I'd want it out of there. It might be as thin as 1/8".
__________________
[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual. It still needs upholstery redone...I also have a 427 Cobra replica with an aluminum chassis.
Reply With Quote
  #19  
Old 12-22-2017, 11:30 AM
Registered User
 
Join Date: Aug 2009
Location: MN
Posts: 1,160
I have experience with things in the chamber. The tip of 2 pre-chambers broke off and were banging around in there for a while ( in my mind "a while " in a running engine could be 5 seconds, it happened for the previous owner, so I don't know ) . The engine still ran. I drove it 70 miles home. It did not run well because of the broken off pre-chambers, but the pistons and valves were fine. The top of the pistons looked like someone took a hammer to it, with little divots marks in the top, but no material seemed to be missing. Based on that experience, I would run it with a piece of plastic in it.

Again, I would, doesn't mean you should.
Attached Thumbnails
OM606 (95 E300D) Plastic retainer piece fell into the combustion chamber-pre-chamber-1.jpg   OM606 (95 E300D) Plastic retainer piece fell into the combustion chamber-pre-chamber-2.jpg  
__________________
Greg
2012 S350 BlueTEC 4Matic
2007 ML 320 CDI
2007 Leisure Travel Serenity
2006 Sprinter 432k
2005 E320 CDI
1998 SLK230 (teal)
1998 SLK230 (silver)
1996 E300D 99k, 30k on WVO
Previous:
1983 240D, on WVO
1982 300D, on WVO
1983 300CD, on WVO
1986 300SDL 237k, 25k on WVO (Deerslayer)
1991 350SDL 249k, 56k on WVO - Retired to a car spa in Phoenix
1983 380 SEC w/603 diesel, 8k on WVO
1996 E300D 351k, 177k on WVO

2007 ML320 CDI .. / 2005 E320 CDI .../ 1998 SLK 230 .../ 1991 Daihatsu Rocky
Reply With Quote
  #20  
Old 01-11-2018, 03:41 PM
Registered User
 
Join Date: Dec 2017
Location: Northern California
Posts: 9
Thank you Everyone for your inputs. I finally got the plastic piece out and thought I'd write a quick follow-up...

While rotating the engine manually I noticed that near top dead center of the cylinder with the plastic piece, the engine was momentarily harder to turn, which meant that fallen plastic piece was actually interfering with piston motion. So I rotated crank until intake valves were opening, but piston was still near the top. Then I cranked up the compressor to 150 psi and started squirting bursts of air into one intake while popping the vacuum suction on the other intake.

It took about an hour of bursting air and popping the vacuum hose until I finally felt the plastic piece getting sucked through.
Attached Thumbnails
OM606 (95 E300D) Plastic retainer piece fell into the combustion chamber-img_0641.jpg   OM606 (95 E300D) Plastic retainer piece fell into the combustion chamber-img_4890.jpg  
Reply With Quote
  #21  
Old 01-11-2018, 03:45 PM
Registered User
 
Join Date: May 2007
Posts: 807
Quote:
Originally Posted by thinfilmboy View Post
Thank you Everyone for your inputs. I finally got the plastic piece out and thought I'd write a quick follow-up...

While rotating the engine manually I noticed that near top dead center of the cylinder with the plastic piece, the engine was momentarily harder to turn, which meant that fallen plastic piece was actually interfering with piston motion. So I rotated crank until intake valves were opening, but piston was still near the top. Then I cranked up the compressor to 150 psi and started squirting bursts of air into one intake while popping the vacuum suction on the other intake.

It took about an hour of bursting air and popping the vacuum hose until I finally felt the plastic piece getting sucked through.
Fantastic piece of work, and great news!!!!!!!
__________________
96 E300d
Reply With Quote
  #22  
Old 01-11-2018, 05:10 PM
WTB: 94/95 E320 Wagon
 
Join Date: Oct 2007
Location: Charleston SC
Posts: 2,484
Yes, that is great news!

I wonder if applying the vacuum to the intake valve runner while rotating the engine so that the valve opening inside the cylinder got larger and larger would work. I'm thinking that the narrow initial opening of the valve would have higher air flow and the plastic piece would be closer to the top (on the piston) and so would get sucked and held at the opening, until the valve opening was large enough for the plastic piece to pass through.
__________________
Respectfully,
/s/
M. Dillon
'87 124.193 (300TD) "White Whale", ~380k miles, 3.5l IP fitted
'95 124.131 (E300) "Sapphire", 379k miles
'73 Balboa 20 "Sanctification"
Charleston SC
Reply With Quote
  #23  
Old 01-11-2018, 06:12 PM
Registered User
 
Join Date: Dec 2017
Location: Northern California
Posts: 9
Quote:
Originally Posted by Maxbumpo View Post
Yes, that is great news!

I wonder if applying the vacuum to the intake valve runner while rotating the engine so that the valve opening inside the cylinder got larger and larger would work. I'm thinking that the narrow initial opening of the valve would have higher air flow and the plastic piece would be closer to the top (on the piston) and so would get sucked and held at the opening, until the valve opening was large enough for the plastic piece to pass through.
Maxbumpo, that is exactly what I ended up doing. With the intake valves just starting to open, and bursting air into the cylinder, you could see the little piece fly in and out of sight.
Reply With Quote
  #24  
Old 01-11-2018, 10:45 PM
vstech's Avatar
DD MOD, HVAC,MCP,Mac,GMAC
 
Join Date: Mar 2006
Location: Mount Holly, NC
Posts: 26,196
Sweet indeed! Glad you got it out safely.
__________________
John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread
"as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do!

My drivers:
1987 190D 2.5Turbo
1987 190D 2.5Turbo
1987 190D 2.5-5SPEED!!!

1987 300TD
1987 300TD
1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!
Reply With Quote
  #25  
Old 01-11-2018, 11:28 PM
#TRUMP2020
 
Join Date: Jun 2012
Location: Virginia
Posts: 790
x2, glad to see you got it out. Something thin and flat like that surely would have got in a valve and caused some nasty metal on metal action. Well done!
__________________
1998 E300 turbodiesel

America's Rights and Freedoms Are Not The Enemy!
Reply With Quote
  #26  
Old 01-17-2018, 02:52 PM
E300d 1995
 
Join Date: Jun 2017
Location: Near Lake Texoma
Posts: 194
After reading this thread today, it makes me doubt if I was careful enough during the removal of my intake manifold.

I'm pretty sure after I removed the black plastic oil vapor plumbing pieces that I blew off the area above the intake manifold, but can't definitely remember doing so.

Next time I'll make sure to remove the fuel line metal brackets and clips before removing the head. All of my plastic clips were broken and pieces found behind all but one metal mounting bracket. And, will also make sure to thoroughly check and clean the area above the intake manifold.

There is a 'pad' shim part # A6010780386 for my car that attaches to the metal bracket and sits beneath the injector lines. This is used to provide a cushion/protector for the back of the injector line. After reading this thread I'll buy new ones and maybe prevent a future problem with the injector lines by holding the lines a little tighter.
Reply With Quote
Reply

Bookmarks

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On
Trackbacks are On
Pingbacks are On
Refbacks are On




All times are GMT -4. The time now is 03:30 PM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2018, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2018 Pelican Parts, LLC - Posts may be archived for display on the Peach Parts or Pelican Parts Website -    DMCA Registered Agent Contact Page