Previous in Forum: Cable Tracker   Next in Forum: Composite Oil Pan
Close
Close
Close
13 comments
Associate

Join Date: Sep 2012
Posts: 34

Steam Coming Out the "Expansion Tank" Hose

07/19/2013 4:12 AM

Good day guys, I have observed that a steam is coming out of the expansion tank cap hose. The end of this hose is open to the atmosphere so i could see droplets of coolant out of this hose during operation of my Liebherr crane. I used to fill coolant in the expansion tank to a correct level. What does it mean to my cooling system? Is it dangerous? The temperature gauge reads 75 deg C. I check the cap and its still good. I'm afraid that my gauge is not working good. Pls help.

Register to Reply
Interested in this topic? By joining CR4 you can "subscribe" to
this discussion and receive notification when new comments are added.

Comments rated to be Good Answers:

These comments received enough positive ratings to make them "good answers".

Comments rated to be "almost" Good Answers:

Check out these comments that don't yet have enough votes to be "official" good answers and, if you agree with them, rate them!
Guru
United Kingdom - Member - Indeterminate Engineering Fields - Control Engineering - New Member

Join Date: Jan 2007
Location: In the bothy, 7 chains down the line from Dodman's Lane level crossing, in the nation formerly known as Great Britain. Kettle's on.
Posts: 30461
Good Answers: 819
#1

Re: STEAM COMING OUT THE "EXPANSION TANK CAP" HOSE

07/19/2013 4:27 AM

Over time, as steam escapes the coolant will become more concentrated and its level will fall, and circulation flow is falling with it. Once the level has fallen below the maximum head that the coolant circulation pump can develop to push it over the weir that has been created between the coolant return pipe and the decreasing coolant level, coolant circulation will stop. If the engine continues to be used, then not long after that it will sieze-up and will want removal and replacement, which will be particularly inconvenient if a load is left on the crane hook at the time as often the weight of the engine is part of the counterbalance arrangements for the jib and the load.

Telephone Liebherr and arrange for a Service Technician to attend and remedy the fault without delay/today/this morning/immediately.

It would be best if the crane were designated "out of order" and not used until the fault has been cleared.

__________________
"Did you get my e-mail?" - "The biggest problem in communication is the illusion that it has taken place" - George Bernard Shaw, 1856
Register to Reply
Associate

Join Date: Sep 2012
Posts: 34
#2

Re: Steam Coming Out the "Expansion Tank" Hose

07/19/2013 7:13 AM

As long as the level of the coolant is tolerable, i mean not that low to the extent that the coolant flow rate is affected, do i still have to worry about the actual temperature of the coolant?What might be the range or the estimated actual temperature of the coolant if steam is cominng out on the expansion tank cap hose?

Register to Reply
Guru
United Kingdom - Member - Indeterminate Engineering Fields - Control Engineering - New Member

Join Date: Jan 2007
Location: In the bothy, 7 chains down the line from Dodman's Lane level crossing, in the nation formerly known as Great Britain. Kettle's on.
Posts: 30461
Good Answers: 819
#3
In reply to #2

Re: Steam Coming Out the "Expansion Tank" Hose

07/19/2013 7:20 AM

Wrong approach. Worry about the crane conking out with a big load some distance off the ground.

Fix the problem before it develops into a crisis. Stop posting here and phone Liebherr instead.

<unsubscribes>

__________________
"Did you get my e-mail?" - "The biggest problem in communication is the illusion that it has taken place" - George Bernard Shaw, 1856
Register to Reply Score 1 for Off Topic
Associate

Join Date: Sep 2012
Posts: 34
#4

Re: Steam Coming Out the "Expansion Tank" Hose

07/19/2013 7:33 AM

so far all the answers of my posts is call the technician.

Register to Reply Score 1 for Good Answer
Anonymous Poster #1
#5
In reply to #4

Re: Steam Coming Out the "Expansion Tank" Hose

07/19/2013 7:37 AM
Register to Reply
Guru
Hobbies - DIY Welding - Don't Know What Made The Old Title Attractive... Popular Science - Weaponology - New Member United States - US - Statue of Liberty - 60 Year Member

Join Date: Apr 2009
Location: Yellowstone Valley, in Big Sky Country
Posts: 6962
Good Answers: 283
#6
In reply to #4

Re: Steam Coming Out the "Expansion Tank" Hose

07/19/2013 9:47 AM

"so far all the answers of my posts is call the technician."

If you believe this to be incorrect, by all means ignore this advice. Perhaps refer to the manual supplied with the machine, instead of calling.

I believe PWSlack is quite correct in his comment.

__________________
When you come to a fork in the road, take it. (Yogiism)
Register to Reply
2
Guru

Join Date: Oct 2008
Posts: 42294
Good Answers: 1663
#7
In reply to #4

Re: Steam Coming Out the "Expansion Tank" Hose

07/19/2013 3:15 PM

Not all. Only most. Many of your requests for enlightenment could be answered by an elementary internet search.

Pressure Limiting Valve Hydraulic Axial Piston Motor :Google

Lamella Brake of a Crane Winch Assembly and Operation :Google

Hydraulic Hose Crimper:Search Global Spec

Valve Plate to Barrel Clearance of a Fixed Displacement Axial Piston Motor: Mmotor supplier

The forum cannot see your equipment, and usually is just asked to a solution to your problems, without the ability to observe and trouble shoot.

Because it is a free service, you should not complain about the quality of response you get here.

If, on the other hand, you are paying someone to solve your problems for you, then you have the right to demand a correct answer.

Register to Reply Good Answer (Score 2)
Guru

Join Date: Feb 2010
Posts: 1013
Good Answers: 36
#8

Re: Steam Coming Out the "Expansion Tank" Hose

07/20/2013 5:16 AM

It is dangerous as far as this is a crane and you might face what has already been said about the safety...

The reading of 75°C looks too low for a diesel engine (or any internal combustion engine). You would expect the reading to be ~85 or 95°C. Therefore, this gauge needs to be checked and replaced if faulty.

Steam coming out is a sign of too high a temperature (> 95 or >100) and /Or a faulty seal on the cap. High Temperature will increase the pressure in the expansion tank and open the cap seal to release excess pressure >> Steam and condensation will show at the hose end.

Therefore, you need a pro to check the system and remedy. The sooner the better and the sooner the less costly it will be later on ...

Register to Reply
Power-User

Join Date: May 2013
Posts: 351
Good Answers: 22
#9
In reply to #8

Re: Steam Coming Out the "Expansion Tank" Hose

07/20/2013 8:10 AM

With a low temperature (if it is really low) the cause for that could be a hanging thermostat. Get a point and shoot thermal device and measure the temperature of the outside of the case as near to the temperature probe as you can get. If the temperature is indeed 75 and you are losing water past the pressure cap, the thermostat is bad, but you probably also have a bad head gasket. A small compression leak from the high pressure in the cylinder while running will overpower the pressure cap and the results will be what you describe. If the temperature is wrong, you might be overheating without knowing it. Either way says repairs must be done, but it probably also means that the engine will not shut down in the middle of operation, just that you will be increasing the cost of repair by continuing to operate it.

Register to Reply Score 1 for Good Answer
Guru

Join Date: Feb 2010
Posts: 1013
Good Answers: 36
#11
In reply to #9

Re: Steam Coming Out the "Expansion Tank" Hose

07/20/2013 10:25 AM

Thanks for reminding about the possible gasket failure (cylinder head) and also seals might have failed, allowing combustion gas into the cooling water, increasing the pressure and releasing via CAP! yes, this is also a possibility. This can happen whether the temperature is normal or below.

This condition can sometimes, provoke a difficulty to kick start the engine if enough water sips into the cylinder while at rest and cold (Hydraulic pressure in cylinder).

the OP should have checked that possibility and give us more info (whether he is having any difficulties at start (Not allways but some times?).

Register to Reply
Guru

Join Date: Jun 2009
Location: Ontario Canada
Posts: 930
Good Answers: 31
#10

Re: Steam Coming Out the "Expansion Tank" Hose

07/20/2013 9:50 AM

If your what appears to be steam is steam and the coolant is well below boiling then I suggest is is gas mixed with coolant appearing to be steam. Inside the engine this is not good as you will have lost coolant contact with cooling jacket surfaces resulting in hot spots and serious damage. Steam is not a good coolant probably never will be in an engine. You probably have a blown head gasket or possibly a crack in a coolant jacket allowing combustion gasses into coolant. You can test for this by capturing the gas being released from the expansion tank and maybe even a sniff test will detect the smell of diesel or what ever fuel is used. If you put a balloon over vent and capture the emission and the balloon fills you can bet the farm that you have compression gas leak. Do not be afraid to call the manufacturer for input they probably have seen most of everything with this equipment.

If it were a gasoline engine an adapter on spark plug hole and injecting compressed air may show which cylinder is leaking. With a diesel this test is more complicated and time consuming.

__________________
The fine line between cuddling and holding one down to prevent escape must be learned
Register to Reply Score 1 for Good Answer
Guru

Join Date: Oct 2008
Posts: 42294
Good Answers: 1663
#12

Re: Steam Coming Out the "Expansion Tank" Hose

07/20/2013 10:33 AM

This "steam" is the mechanical version of the electronic "magic smoke" that sometimes appears just prior to catastrophic failure of the device from which it is emitted.

No one here is going to fix your problems for free. Call a service tech.

You could replace the water with motor oil. That would cure the "steam" problem.

Register to Reply
Power-User

Join Date: May 2013
Posts: 351
Good Answers: 22
#13
In reply to #12

Re: Steam Coming Out the "Expansion Tank" Hose

07/21/2013 3:32 PM

Early on the GE handbook, which was a huge catalog of all GE offerings, had a page with a spoof, with a bogus offering, the "Smoke Inculcator" the write up was very tungue-in-cheek about how it could put the smoke back into a failed electrical item. Since the handbook was designed to last many years, no prices were given. I always wondered if anyone had ever tried to order one. I would have loved to have received that call. What you need is a "Steam Inculcator"

Register to Reply
Register to Reply 13 comments
Interested in this topic? By joining CR4 you can "subscribe" to
this discussion and receive notification when new comments are added.

Comments rated to be Good Answers:

These comments received enough positive ratings to make them "good answers".

Comments rated to be "almost" Good Answers:

Check out these comments that don't yet have enough votes to be "official" good answers and, if you agree with them, rate them!
Copy to Clipboard

Users who posted comments:

4wsilver (2); Anonymous Poster (1); Doorman (1); LAA_Lucke (2); lyn (2); PWSlack (2); roy hammy (1); yaj lleb (2)

Previous in Forum: Cable Tracker   Next in Forum: Composite Oil Pan

Advertisement