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  #16  
Old 02-04-2018, 12:08 PM
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Quote:
Originally Posted by ah-kay View Post
Leak down test is not to check cooling system integrity if I understand correctly. It is to check the rings and cylinder wall. Also it is only 20psi. Am I missing something? No way you will see air bubbles at 100psi, even much more.
He is checking for a cracked head where combustion gases are finding a way to the coolant hence the hard coolant line ober night. 100 psi is used to make hearing or seeing the leak more pronounced.
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  #17  
Old 02-04-2018, 12:22 PM
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Originally Posted by dieselbenz1 View Post
He is checking for a cracked head where combustion gases are finding a way to the coolant hence the hard coolant line ober night. 100 psi is used to make hearing or seeing the leak more pronounced.
??

Please read up leak down test. If you see bubbles at 100psi the head is a goner and I doubt the car can be driven as described by OP. What is the pressure when combustion happens?
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  #18  
Old 02-04-2018, 12:41 PM
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Did the engine see a lot of heat? Because if it didn't the head isnt just going to magically crack. You probably just have a bad head gasket. I'm so confused on your post as well.. Why are you concerned about pollution? It was good in its time, but with all the green freaks and modern cars it's most certainly not up to standards. But if that's your concern, I wouldn't mind buying an SDL if it's clean otherwise.
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  #19  
Old 02-04-2018, 12:58 PM
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Sorry for my poor English attempt to express the situation,

I am probably better with my hands,

I am debating/hesitating before I take the head off, check to it my self,(gasket, visual ,straight edge,),

if I want to spend the money, and take it to Metric, in Canoga Park,Ca,

Car did not heat, in the last 150,000 miles I drove,

Once it drives, it loves the 70-80 miles, for hours,

only at night time it gets the hard radiator hose being hard,

Few days ago, it stop happening, NO hard radiator hose,

I change the coolant Tank cap, and the pressure came back, and made the hose HARD,

Could not see any wrong with the old cap,

but it leads me to believe, that the combustion gases are penetrating,

Time to take the Cyl. head off,

Thanks for your kind input,

It helps,

Long way for clarity,
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  #20  
Old 02-04-2018, 12:59 PM
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Quote:
Originally Posted by rreeuuvveenn View Post
Lisle 75630 Special Indicator Fluid for the Lisle Combustion Leak Detector,
Lisle 75730 is labeled for Diesels. 75630 isn’t.

https://www.amazon.com/gp/aw/d/B000I16L90

But you mentioned red fluid which is for Diesels vs blue for... it doesn’t say.

How did you get test fluid into the combustion chamber? There is no engine vacuum to draw it as the instructions suggest.

Sixto
98 E320s sedan and wagon
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  #21  
Old 02-04-2018, 01:07 PM
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it says diesel on the bottle

Quote:
Originally Posted by sixto View Post
Lisle 75730 is labeled for Diesels. 75630 isnít.

https://www.amazon.com/gp/aw/d/B000I16L90

But you mentioned red fluid which is for Diesels vs blue for... it doesnít say.

How did you get test fluid into the combustion chamber? There is no engine vacuum to draw it as the instructions suggest.

Sixto
98 E320s sedan and wagon
it says diesel on the bottle,
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  #22  
Old 02-04-2018, 01:09 PM
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One temporary trick is to leave the pressure cap only on the first latch, not fully closed, so cooling system cannot build pressure. Cooling capacity is reduced so watch the temp gauge but coolant can flow better because the pump isn’t fighting full pressure all the time.

Sixto
98 E320s sedan and wagon
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  #23  
Old 02-04-2018, 01:10 PM
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it is Lisle 75730,
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  #24  
Old 02-04-2018, 01:11 PM
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I think I will put the old cap back, till I fix the problem

Quote:
Originally Posted by sixto View Post
One temporary trick is to leave the pressure cap only on the first latch, not fully closed, so cooling system cannot build pressure. Cooling capacity is reduced so watch the temp gauge but coolant can flow better because the pump isnít fighting full pressure all the time.

Sixto
98 E320s sedan and wagon

I think I will put the old cap back, till I fix the problem

Thanks Sixto
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  #25  
Old 02-04-2018, 07:20 PM
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Originally Posted by ah-kay View Post
??

Please read up leak down test. If you see bubbles at 100psi the head is a goner and I doubt the car can be driven as described by OP. What is the pressure when combustion happens?
Please listen to 40 + years of experience building engines. Any experienced engine guy knows what I'm talking about. A leak down test encompasses more than just piston rings.

We don't care about leak down percentages in this case, just if the air ends up in the cooling system.

100 PSI is typical and plenty in finding a combustion chamber to coolant leak that means anything. In fact, if you get a cylinder head pressure checked at a machine shop, they to use 100 ish PSI.

I generally fill the rad to the top then look for the level to rise. If the level goes up, there is a slight leak. Bubbles are a sign of a larger leak. I've worked on engines that used a qt of water every 4,000 miles, when doing a leak down, the level would slowly rise. A qt every 4,000 miles is very slight and the leak down test found it.

Any rise with a pressurized cylinder = combustion chamber to coolant leak. This could be from a failing head gasket / cracked head / cracked cylinder.
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  #26  
Old 02-04-2018, 08:57 PM
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Quote:
Originally Posted by 97 SL320 View Post
Please listen to 40 + years of experience building engines. Any experienced engine guy knows what I'm talking about. A leak down test encompasses more than just piston rings.

We don't care about leak down percentages in this case, just if the air ends up in the cooling system.

100 PSI is typical and plenty in finding a combustion chamber to coolant leak that means anything. In fact, if you get a cylinder head pressure checked at a machine shop, they to use 100 ish PSI.

I generally fill the rad to the top then look for the level to rise. If the level goes up, there is a slight leak. Bubbles are a sign of a larger leak. I've worked on engines that used a qt of water every 4,000 miles, when doing a leak down, the level would slowly rise. A qt every 4,000 miles is very slight and the leak down test found it.

Any rise with a pressurized cylinder = combustion chamber to coolant leak. This could be from a failing head gasket / cracked head / cracked cylinder.
Thanks for the enlightenment. What i meant is seeing bubble is very serious. Is a qt every 4000 miles acceptable? I really don't think the OP has a serious issue and warrant a head removal, IMHO.
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W124 Keyless remote, PM for details. http://www.peachparts.com/shopforum/mercedes-used-parts-sale-wanted/334620-fs-w124-chasis-keyless-remote-%2450-shipped.html

2 x 87 300SDL
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1 x 83 300D
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  #27  
Old 02-04-2018, 11:49 PM
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thanks a LOT for your response, and input,

Quote:
Originally Posted by ah-kay View Post
Thanks for the enlightenment. What i meant is seeing bubble is very serious. Is a qt every 4000 miles acceptable? I really don't think the OP has a serious issue and warrant a head removal, IMHO.

I do tend to agree with Ah-Kay,

The car drives like lion, love 70-80 MPH, climbs hill,

Turbo 12 psi,

No loss of coolant.

Filled the coolant tank, till the top, NO bubbles, no change in coolant level,

While engine is idling,

The pressure in the cylinders is almost 2000 psi,

So why should push 100 psi, down the injectors, to see bubbles,


Still hard radiator hose in the morning,

Might go tomorrow to a shop with combustion sniffer,

Live and learn,


Thanks for your kind support,
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  #28  
Old 02-04-2018, 11:58 PM
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If leak is so minor, maybe re-torque of the head,

If leak is so minor, maybe re-torque of the head,


Might reduce the leak,
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  #29  
Old 02-05-2018, 01:31 AM
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Quote:
Originally Posted by rreeuuvveenn View Post
If leak is so minor, maybe re-torque of the head,


Might reduce the leak,
Don't touch it. Just enjoy the car.
__________________
Not MBZ nor A/C trained professional but a die-hard DIY and green engineer. Use the info at your own peril. Picked up 2 Infractions because of disagreements. NOW reversed.

W124 Keyless remote, PM for details. http://www.peachparts.com/shopforum/mercedes-used-parts-sale-wanted/334620-fs-w124-chasis-keyless-remote-%2450-shipped.html

2 x 87 300SDL
1 x 87 300D
1 x 87 300TDT wagon
1 x 83 300D
1 x 84 190D ( 5 sp ) - All R134 converted + keyless entry.
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  #30  
Old 02-05-2018, 03:29 AM
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the saying here applies.. "if it ain't broke don't fix it"
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