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  #16  
Old 12-21-2017, 02:41 PM
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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.
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2007 ML 320 CDI
2006 Sprinter 432k
2005 E320 CDI
1998 SLK230 (teal)
1998 SLK230 (silver)
1996 E300D 99k, 30k on WVO
1996 E300D 351k, 177k on WVO
Previous:
1983 240D, on WVO
1982 300D, on WVO
1983 300CD, on WVO
1984 190D (Deerslayer) on WVO
1986 300SDL 237k, 25k on WVO (Deerslayer)
1991 350SDL 249k, 56k on WVO - Retired to a car spa in Phoenix to get a make over
1983 380 SEC w/603 diesel, 8k on WVO (sold)

2007 ML320 CDI .. / 2005 E320 CDI .../ 1998 SLK 230 .../ 1991 Daihatsu Rocky
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  #17  
Old 12-22-2017, 08:02 AM
Bengoshi2000's Avatar
1991 300D 2.5 Turbo
 
Join Date: Jan 2011
Location: NC, USA
Posts: 131
"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.
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  #18  
Old 12-22-2017, 08:23 AM
t walgamuth's Avatar
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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".
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  #19  
Old 12-22-2017, 11:30 AM
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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  
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2007 ML 320 CDI
2006 Sprinter 432k
2005 E320 CDI
1998 SLK230 (teal)
1998 SLK230 (silver)
1996 E300D 99k, 30k on WVO
1996 E300D 351k, 177k on WVO
Previous:
1983 240D, on WVO
1982 300D, on WVO
1983 300CD, on WVO
1984 190D (Deerslayer) on WVO
1986 300SDL 237k, 25k on WVO (Deerslayer)
1991 350SDL 249k, 56k on WVO - Retired to a car spa in Phoenix to get a make over
1983 380 SEC w/603 diesel, 8k on WVO (sold)

2007 ML320 CDI .. / 2005 E320 CDI .../ 1998 SLK 230 .../ 1991 Daihatsu Rocky
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  #20  
Old 01-11-2018, 03:41 PM
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Join Date: Dec 2017
Location: Northern California
Posts: 5
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  
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  #21  
Old 01-11-2018, 03:45 PM
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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!!!!!!!
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  #22  
Old 01-11-2018, 05:10 PM
WTB: 94/95 E320 Wagon
 
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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.
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  #23  
Old 01-11-2018, 06:12 PM
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Join Date: Dec 2017
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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.
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  #24  
Old 01-11-2018, 10:45 PM
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Sweet indeed! Glad you got it out safely.
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  #25  
Old 01-11-2018, 11:28 PM
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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!
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