OM 606 Drilled too deep trying to extract a stuck Glow Plug - Page 3 - PeachParts Mercedes-Benz Forum

renaissanceman · #1 04-11-2016, 05:18 PM

Well, Assuming he drilled through the wall of the GP bore and breached the cooling jacket there...I was assuming a hole drilled through the GP tip, through the other side of whatever wall is opposite the GP (it would be through the opposite prechamber wall on my 603...)

Drain the radiator and the block. I'm thinking the block plug will be on the passenger side of the engine about halfway back where it is on my 603.

greazzer · #2 04-11-2016, 02:54 PM

If anything, take a deep breath and take your time with the solution. Anything can be fixed, and many "holy sh&* moments are readily fixable and no big deal.

vstech · #3 04-11-2016, 05:13 PM

I would remove the block drain plug, TODAY... it's likely the coolant is only leaking out the drilled hole, not into the pc... or piston... your best bet is draining the coolant and when time allows investigate further solutions with the damage.

thatguy · #4 04-12-2016, 12:47 PM

Sorry about your misfortune, those OM606 glow plugs certainly have a (well-earned) bad reputation.

Last time I did mine in 2012 I put on a generous amount of Lubro Moly anti-seize, but every time I see these threads it makes me want to go out and perpetually hit them with PB Blaster every weekend until the day comes I need to do them again.

funola · #5 04-12-2016, 01:05 PM

This prechamber diagram is from a 190D and may resemble your 606 prechamber. Per Kartek, you would have had to drill through the glow plug then through the opposite side of the pre chamber into the aluminum head casting for coolant to leak into the pre chamber. In that case, the set screw is not going to help....it will hydro lock.

Can you measure how deep you actually drilled? It would be useful information for others attempting the same job in the future. You shouldn't have drilled more than 1/2" before tapping ( where most of the meat on the glow plug was). The glow plug gets smaller in diameter the further in you go. What were you thinking?

renaissanceman · #6 04-12-2016, 01:16 PM

Quote:

Originally Posted by funola

This prechamber diagram is from a 190D and may resemble your 606 prechamber. Per Kartek, you would have had to drill through the glow plug then through the opposite side of the pre chamber into the aluminum head casting for coolant to leak into the pre chamber. In that case, the set screw is not going to help....it will hydro lock.

Two cases I see:

1.) he drilled all the way through the GP, opposite side of the prechamber and through the AL wall of the head into the coolant jacket. A set screw would not cause hydrolock -- it would plug the hole on the opposite side of the prechamber.

2.) The drilled hole was off axis enough to start cutting into the head before reaching the tip of the GP, and cut into the water jacket. If this is the case, there should be little or no coolant in the prechamber or cylinder. This may be able to be patched up too. I'm hoping Mike will post photos from the borescope so we can see/help.

Quote:

Originally Posted by funola

...What were you thinking?

Probably that he was tired and frustrated and thought hewas doing what he should do. Don't beat him up more than he already is doing to himself.

funola · #7 04-12-2016, 02:16 PM

Quote:

Originally Posted by renaissanceman

Two cases I see:

1.) he drilled all the way through the GP, opposite side of the prechamber and through the AL wall of the head into the coolant jacket. A set screw would not cause hydrolock -- it would plug the hole on the opposite side of the prechamber.

2.) The drilled hole was off axis enough to start cutting into the head before reaching the tip of the GP, and cut into the water jacket. If this is the case, there should be little or no coolant in the prechamber or cylinder. This may be able to be patched up too. I'm hoping Mike will post photos from the borescope so we can see/help.

Probably that he was tired and frustrated and thought hewas doing what he should do. Don't beat him up more than he already is doing to himself.

I thought your set screw was placed to plug up the glow plug hole where the flare was. Didn't even consider placing it through the prechamber into the head. How long do you expect that to last? I wouldn't even consider it. Wasted effort IMO.

Sorry, didn't mean to beat him up. It was to understand why he did what he did, learn from other's mistakes.

If I were to do such a job, I'd have a good glow plug on the bench before starting so I can take measurements in order to choose the correct drills and taps.

ah-kay · #8 04-12-2016, 03:02 PM

Quote:

Originally Posted by funola

This prechamber diagram is from a 190D and may resemble your 606 prechamber. Per Kartek, you would have had to drill through the glow plug then through the opposite side of the pre chamber into the aluminum head casting for coolant to leak into the pre chamber. In that case, the set screw is not going to help....it will hydro lock.

Can you measure how deep you actually drilled? It would be useful information for others attempting the same job in the future. You shouldn't have drilled more than 1/2" before tapping ( where most of the meat on the glow plug was). The glow plug gets smaller in diameter the further in you go. What were you thinking?

Isn't it FACTUALLY CORRECT as per the picture that the injector is over the GP?

It took a lot of effort for the PO to drill through the pre-chamber plus the aluminum head, and a looong drill. The head is toasted. What was done was done, move on. It may be possible to remove the pre chamber and plug the hole with a set screw. But with no dis-respect to the PO, I would leave it to the professional.

mikemass1221 · #9 04-12-2016, 03:07 PM

Quote:

Originally Posted by ah-kay

Isn't it FACTUALLY CORRECT as per the picture that the injector is over the GP?

It took a lot of effort for the PO to drill through the pre-chamber plus the aluminum head, and a looong drill. The head is toasted. What was done was done, move on. It may be possible to remove the pre chamber and plug the hole with a set screw. But with no dis-respect to the PO, I would leave it to the professional.

I take no disrespect at all. I am a weekend warrior. From now on oil changes and brakes jobs is about it for me.

Yes. Lots of effort and stupidity. Once the GP broke, I should have stepped back, taken a break, done more research and re evaluate. Instead I went ultra aggressive with the drill.

funola · #10 04-12-2016, 03:19 PM

The part that was factually incorrect is: "injectors always spray fuel onto the GP ( when hot ) to fire the engine."

I agree the engine is toast.

To control drill depth you can buy different size drill stops with set screws. I don't like them and prefer a stiff tube over the drill bit as a stop. Ball point pen, nylon tubing etc cut to length works much better. I would not rely on tape as a depth marker on the drill bit because when the drill punches through the hole, you can not stop it.

Quote:

Originally Posted by ah-kay

Isn't it FACTUALLY CORRECT as per the picture that the injector is over the GP?

It took a lot of effort for the PO to drill through the pre-chamber plus the aluminum head, and a looong drill. The head is toasted. What was done was done, move on. It may be possible to remove the pre chamber and plug the hole with a set screw. But with no dis-respect to the PO, I would leave it to the professional.

Mölyapina · #11 04-11-2016, 05:24 PM

I notice that no-one has mentioned this so far, but if you have drilled through the glow plug into the prechamber, I would also be concerned about what metal chips have made their way into the engine...

funola · #12 04-11-2016, 07:03 PM

The OP said it was fuel that was coming out, he did not say it was coolant. I am surprised people are against verifying how far he drilled and what fluid it was that was coming out. It's so easy, just stick a rod smaller diameter than the drill used in there and see how far it goes.

ah-kay · #13 04-11-2016, 10:10 PM

I do not know much about the 606 engine ( familiar with 617 and 603 ) but injectors always spray fuel onto the GP ( when hot ) to fire the engine. I really doubt drilling the GP out would hit the injector. It is on top on the GP and not behind it. In addition, it is very hard to drill thru an injector. The fuel inside is miniuscule in any event. It is very likely coolant if the cylinder was indeed poked thru. The pre-chamber may also be in the way. In short, I do not know what happened but the head probably is toasted.

funola · #14 04-12-2016, 12:58 AM

Quote:

Originally Posted by ah-kay

I do not know much about the 606 engine ( familiar with 617 and 603 ) but injectors always spray fuel onto the GP ( when hot ) to fire the engine. .........

Sorry, that is factually incorrect as BC used to say. A good injector sprays onto the ball pin in the pre chamber, never onto the glow plug. A bad injector with a bad spray pattern can spray onto the glow plug and erode it till bits of it falls off causing extensive damage.

ah-kay · #15 04-12-2016, 01:08 AM

Quote:

Originally Posted by funola

Sorry, that is factually incorrect as BC used to say. A good injector sprays onto the ball pin in the pre chamber, never onto the glow plug. A bad injector with a bad spray pattern can spray onto the glow plug and erode it till bits of it falls off causing extensive damage.

I am wasting my time to reply but I do it anyway for 2 reasons. BC is history. Secondly, I am saying the injector is above the GP relatively, whether it is DIRECTLY above is not relevant in the context of 'drilling thru' scenario.