New Monarks are in but.....problem - PeachParts Mercedes-Benz Forum

4thesporty · #1 10-31-2010, 10:26 PM

I replaced my original injectors tonight with a set of Monarks.

The car is more loud now, almost like it "could" be nailing. I have not heard that before, but it is more metallic sounding, if that makes sense. I thought it would quiet down a bit with these injectors.

Also, it seems that I have a leak from my prechamber. See this video:

http://www.youtube.com/watch?v=OWk4vxc5coo

From what I've read, this could be the return lines leaking. (I did re-use them) or the injector not tightened all the way.

What do ya'll think?

dude99 · #2 10-31-2010, 10:29 PM

bubbling around the base of the injector, did you reuse your heat shields?

4thesporty · #3 10-31-2010, 11:07 PM

Brand new heat shields, they came with the injectors.

I also researched and made sure I put them in the correct way.

79Mercy · #4 10-31-2010, 11:09 PM

New injectors are going to be louder for the first 200 miles or so. The FSM covers that. Nothing to worry about there.

However the leaking pre-chamber is a problem. I wonder if when you took the injector out it loosened the prechamber nut a little bit?

C Sean Watts · #5 10-31-2010, 11:20 PM

What did you torque them to?

Also, when removing the old ones did you put even pressure on the ratchet/bar or 'snap' it?

4thesporty · #6 10-31-2010, 11:32 PM

Quote:

Originally Posted by C Sean Watts

What did you torque them to?

Also, when removing the old ones did you put even pressure on the ratchet/bar or 'snap' it?

When removing I put the ratchet on and hit it with a hammer to break them free, I knew not to put steady pressure on them.

I torqued them to 50 ft/lbs. (However, this was a torque wrench from HF)

Perhaps some new heat shields and a proper wrench is in order.

79Mercy · #7 11-01-2010, 08:25 AM

Quote:

Originally Posted by 4thesporty

When removing I put the ratchet on and hit it with a hammer to break them free, I knew not to put steady pressure on them.

You must have loosened the prechamer when you "broke" them loose. You should have applied slow and steady pressure until they came loose.

vstech · #8 11-01-2010, 09:23 AM

Quote:

Originally Posted by 79Mercy

You must have loosened the prechamer when you "broke" them loose. You should have applied slow and steady pressure until they came loose.

no.
this is a bad practice. smacking the breaker bar is the best way to get them out.
if a PC gets loose this way it would have gotten loose and totally unscrewed itself with steady pressure.

Diesel911 · #9 10-31-2010, 11:24 PM

Where the Injectors completely rebuilt are was this a Diesel Giant type Nozzle Swap?

You may or may not have a leak around the Heat Shield of the Prechamer. When fluid seeps past the Injector to Prechamber Ring/Collar threads it gets into space in there.

The heat and the shock wave created by the Fuel Burning (before the Engines warmed up and it is running put your Finger on and around the area of the Injector and see what you can feel) causes the liquid bubble out as if there is a leak.

It also could be a good time to re-time your Fuel Injection Pump.

4thesporty · #10 10-31-2010, 11:33 PM

Quote:

Originally Posted by Diesel911

Where the Injectors completely rebuilt are was this a Diesel Giant type Nozzle Swap?

Complete injector, brand new.

Tpawlik · #11 11-01-2010, 07:28 AM

I had Sean Watts rebuild mine with Monarch nozzles. They were so loud I thought something was wrong with the engine. But, I also had some air leaks in the fuel system. Find your fuel/air leaks. The new injectors will quiet down and so will your engine.

DieselPaul · #12 10-31-2010, 11:28 PM

Did you pop test the injectors and check the spray pattern? I put new monarks from DG into an old body and it was horrible. After going through a couple spare injectors I got one to crack at 135 bar and spray perfect.

vstech · #13 11-01-2010, 10:08 AM

I was going to respond no, until I read the carbon part... yeah, get a new set of each, and get in there well with a good dental pic until the seats and threads are all clean steel! I noticed that pb blaster does a good job of softening the carbon on the threads! also, if you didn't clean out the carbon, you could have an extra shield in there, I've pulled heads with 3 in it before! clean until you can see the bottom of the PC quite clean!

SirNik84 · #14 11-01-2010, 12:48 PM

My sister is a Diesel head of the VW verity, she called me one day because her friend had an old Diesel Rabbit that he ran out of fuel. I got on the phone with her friend and explained how to bleed injectors. about a week later I asked my sister if her friend got his car going. she said no, he burned up the starter and then sold the car. I said "WHAT???" she explained that he never cracked the injector lines because he was afraid of having fuel on his hot engine and having an engine fire.... SO instead he trashed his car???

Don't Fear the Diesel!!

4thesporty · #15 11-06-2010, 08:55 PM

I did some work on the car today.

I have new heat shields and was planning on replacing them, but first I wanted to put a proper torque wrench on the injectors. I had previously used a HF wrench.

I put my borrowed (calibrated) snap-on on them and they were all a good 10 ft/lbs too loose.

I will drive it like this and keep an eye and if need be, will be replacing heat shields next weekend.

BTW: The injectors were noisy for about 100 miles, now are fine and the power increase is amazing! I had to adjust the bowden cable as the car was shifting too late with the new injectors.