IP Destroying Injectors, GP, and Prechamber? [long] - Page 2 - PeachParts Mercedes-Benz Forum

Tymbrymi · #16 11-25-2006, 03:24 AM

The departed...

#17 11-25-2006, 03:37 AM

Quote:

Originally Posted by Tymbrymi

As I imagine everyone is going to say toasted engine...

I would have to say, yes.

Brian Carlton · #18 11-25-2006, 08:53 AM

Quote:

Originally Posted by vstech

from the closeup pictures of the old PC, it looks like you or someone pulled or tried to pull the PC with the GP still installed. my guess is the pc pintle ball fell into the cylinder and destroyed a valve or piston crown, and you will mostlikely need another engine.
John

Can you explain how this occurs? The holes in the end of the prechamber are very small........1mm or so..........so I'm not grasping how these large chunks of glow plug (or pintle ball) got inside the cylinder? Wouldn't they just sit on the bottom of the prechamber?

Brian Carlton · #19 11-25-2006, 08:56 AM

Quote:

Originally Posted by Tymbrymi

The departed...

That SD looks to be in excellent shape from the photo. Another engine for it would not be all that expensive, especially if the body is as good as it looks.

It shouldn't go to the boneyard.........too nice for that.

ck42 · #20 11-25-2006, 10:30 AM

IANAM, but out of sheer curiosity, why does it look like there are valve indentations in the tops of all the pistons???

Normally, I would think that a belt/chain broke and this was interference engine and the two hit. Are those round indentations normal? Intentional? Have some sort of mechanical function?

Brian Carlton · #21 11-25-2006, 10:34 AM

Quote:

Originally Posted by ck42

IANAM, but out of sheer curiosity, why does it look like there are valve indentations in the tops of all the pistons???

Normally, I would think that a belt/chain broke and this was interference engine and the two hit. Are those round indentations normal? Intentional? Have some sort of mechanical function?

The pistons are manufactured with recesses for the valves. The clearance is apparently too small to take the risk without the recesses.

........good to see you around the forum again......

ck42 · #22 11-25-2006, 11:03 AM

Quote:

Originally Posted by Brian Carlton

The pistons are manufactured with recesses for the valves. The clearance is apparently too small to take the risk without the recesses.

........good to see you around the forum again......

Very interesting! It's probably just a lack of knowledge, but I've never heard of this being done. Good to know.

.......I'm always around

Just not as active as I used to be since I got most of the work done of the SD a while back. Nowdays, it's just the regular long-term work that pops up on occasion. But, I still peek around routinely looking for interesting threads like this one.

Chris
'85 300SD

michael cole · #23 11-25-2006, 12:41 PM

those prechamber shots look familiar infact identical to several i pulled out of my 300sd about 10 years ago.damage is almost identical.never did figure out why this happened but it was suggested that use of starting ether could have led to this

#24 11-25-2006, 01:06 PM

Quote:

Originally Posted by Brian Carlton

The holes in the end of the prechamber are very small........1mm or so.

You would be suprised, they are actually pretty big...

The 3 holes on the front are 4mm, the one pointing down is 2mm, and the two on the back are 3mm.

Tymbrymi · #25 11-25-2006, 04:17 PM

Quote:

Originally Posted by Brian Carlton

The pistons are manufactured with recesses for the valves.

Here is a pic of nice shiny new ones... courtesy of Worldpac.

Cool! Transparent background

Tymbrymi · #26 11-25-2006, 04:22 PM

Quote:

Originally Posted by Brian Carlton

Can you explain how this occurs? The holes in the end of the prechamber are very small........1mm or so..........so I'm not grasping how these large chunks of glow plug (or pintle ball) got inside the cylinder? Wouldn't they just sit on the bottom of the prechamber?

I'm curious about that too... the ball never left the PC on mine. I guess if it is in there long enough it could break up into pieces that are small enough to fit through the PC holes?

popscat · #27 11-25-2006, 04:44 PM

just read about your experience, you just saved my butt. i was going to do the smae thing to my engine

Tymbrymi · #28 11-25-2006, 05:22 PM

Quote:

Originally Posted by Brian Carlton

That SD looks to be in excellent shape from the photo. Another engine for it would not be all that expensive, especially if the body is as good as it looks.

It shouldn't go to the boneyard.........too nice for that.

The body is in decent shape... but the jack points are starting to get rusty. Also, the seats are in pretty sad shape. To me... its a borderline thing. If there was just one less thing wrong with it I would slowly bring it back, but as it is I'm on the fence.

Tymbrymi · #29 11-25-2006, 05:41 PM

Quote:

Originally Posted by hell6789

just read about your experience, you just saved my butt. i was going to do the smae thing to my engine

Glad that my mistake can help prevent others...

Brian Carlton · #30 11-25-2006, 06:57 PM

Quote:

Originally Posted by Tymbrymi

The body is in decent shape... but the jack points are starting to get rusty. Also, the seats are in pretty sad shape. To me... its a borderline thing. If there was just one less thing wrong with it I would slowly bring it back, but as it is I'm on the fence.

Yeah........I hear you. If it needs bodywork.......and another engine........you've really got to have the time and the dedication.........just very sad to see a W116 get terminated........there's so few of them left that are above hopeless.

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