60x Injector hard line broken, (by vibration) wtf? - PeachParts Mercedes-Benz Forum

winmutt · #1 01-14-2013, 08:38 PM

Miraculously my #3 hard line started squirting back out the top. I tried tightening it down a bit wo luck. Suggestions?

Brian Carlton · #2 01-14-2013, 08:40 PM

A crack in the line beneath the nut.

Vibration eventually gets it.

Time for a replacement.

qwerty · #3 01-14-2013, 08:46 PM

Quote:

Originally Posted by winmutt

Miraculously my #3 hard line started squirting back out the top

Some of us never get to witness a miracle. Consider yourself very fortunate.

Brian Carlton · #4 01-14-2013, 08:47 PM

Quote:

Originally Posted by qwerty

Some of us never get to witness a miracle. Consider yourself very fortunate.

Yeah..........a miracle that I'd rather avoid...........

vstech · #5 01-14-2013, 09:40 PM

Quote:

Originally Posted by winmutt

Miraculously my #3 hard line started squirting back out the top. I tried tightening it down a bit wo luck. Suggestions?

which car? the 603 lines are notorious for this...
if it's for the 617, I've got plenty of spare lines... none for the 603 though.

Diesel911 · #6 01-14-2013, 09:47 PM

The Hard Lines crack more frequently if the clamps that steady the hard Lines are missing or damaged.
With in a few months of buying My Car I bought an extra set of Hard Lines; just incase.

winmutt · #7 01-15-2013, 11:18 AM

I dont have any 61xs any more.

scottmcphee · #8 01-15-2013, 02:50 PM

Plus the lines are dainty and probably wall thickness is down on the 603 compared to 617.

vstech · #9 01-15-2013, 08:50 PM

Quote:

Originally Posted by scottmcphee

Plus the lines are dainty and probably wall thickness is down on the 603 compared to 617.

considerably.
lets put it this way...
the ID is nearly the same on both years...

raysorenson · #10 01-15-2013, 10:19 PM

I just had to buy a new #4 line for my 603. Probably the same deal. Squirting up from the fitting. The clips that hold the line to stop vibration were broken. Lesson learned. It cost me ~$60 OTD to have the part in hand the next day from the local dealership.

winmutt · #11 01-16-2013, 01:19 PM

I ordered all the clips and mounts, price was not cheap...

whunter · #12 01-16-2013, 01:34 PM

Quote:

Originally Posted by winmutt

Miraculously my #3 hard line started squirting back out the top. I tried tightening it down a bit wo luck. Suggestions?

This is common with the OM60x engines.
The anti vibration clips fail or someone forgets to re-install them.

Normal engine vibration usually cracks the steel line at the compression nut.
Line repair is difficult or impossible.

.

vstech · #13 01-16-2013, 07:43 PM

Quote:

Originally Posted by whunter

This is common with the OM60x engines.
The anti vibration clips fail or someone forgets to re-install them.

Normal engine vibration usually cracks the steel line at the compression nut.
Line repair is difficult or impossible.

.

well, which is it?

exactly HOW good are you with a mig?

whunter · #14 01-17-2013, 12:00 PM

Quote:

Originally Posted by vstech

well, which is it?

exactly HOW good are you with a mig?

I know this was a chuckle, but I am going to answer it as a serious question.

Here is an example of a simple high pressure pipe weld.
Stick Welding 2 inch Pipe Cover Pass - 6g Pipe Welding Test 2" Schedule 80 - YouTube

The joint needs to be a single-Vee or a single-U...

.

As the pipe size gets smaller, the difficulty goes up.
* Heat control, burn holes.
* Collapsed tube.
* Blocked tube, penetration/slag.
* Grinding the outer diameter.
* Boring and cleaning the tube bore.
Then comes the fun.

You must use stress relieving, and I prefer annealing.

After welding, you can do high temp stress relieve at 1250° F, for 1-1.5 hr per inch of material thickness, 1 hour minimum, as opposed to a true anneal. Furnace cool if possible.

After welding low carbon steel (under 0.25 carbon) I usually normalize which helps "homogenize" the material.
To anneal then normalize is called "double draw", which is critical if you plan to carburize or do other heat treating later.

Annealing range for 1018 steel is 1575° F -1650° F. Time at temp 1/2 hr for small section (13 mm or less), 1 hr for 25mm section.
Recommended furnace cooling rate of 50° F/hr over range from 1575° F to 1300° F for HB 111-149.
(from metals handbook)

*********************************

From my cost perspective:
# 3-4 hours labor.
# Weld and Annealing furnace fuel $50.00
# Building a solid and safe (small) Annealing Furnace, $200.00 + 24 hours labor.

IMO all of this is possible for the most skilled professional or most tenacious hobbyist.
It is not cost effective.
A single mistake in any of these processes will frequently turn the (used part) work piece into scrap metal.
The failed line may have formed preliminary stress fractures on the other end, just waiting to break.

.

gonesurfing · #15 03-21-2019, 12:27 AM

I got behind a Nissan murano yesterday spilling gasoline from underneath every time he turned. Tried to catch him and tell him before the car went up in flames but he turned into a neighborhood and I lost him. I didn't see a fried car on my way to work today, so maybe he figured it out. God knows everyone behind him could smell it.