NAPA sells a kit https://www.napaonline.com/napa/en/p/BK_7001006/
that detects exhaust gases in the coolant. I've also used an exhaust gas analyzer at a local
independent auto repair shop. CO2 measured in the 60PPM at the radiator neck. Replaced the
head gasket and it was down to 4-5PPM.
At the same time cleaned the cooling system with oxalic acid crystals, then a rinse with water
or baking soda. White vinegar works well too.
From: diesel_mercedes@yahoogroups.com [mailto:diesel_mercedes@yahoogroups.com]
Sent: Thursday, June 30, 2016 8:53 AM
To: diesel_mercedes@yahoogroups.com
Subject: Re: [diesel_mercedes] 240d engine in Jeep acting up
That was one of the clues I didn't see. There was no loosing of cooling water or graying of the oil. So I figured there was no breaks in the head gasket that would swap those two fluids. The one thing that didn't exist in last nights test was pressure in the cooling system. So there could be no way for cooling water to enter the cylinder (and adversely affect the combustion) if there was a crack. But since there was no air entering the cooling system I ruled out such a crack. There is no sign of oil in the cooling water either. It is starting to look like it was a sticking valve, sticking ring or rings, and/or sticking piston in the fuel pump for that cylinder. And the MMO might have just loosened it/them up. I will know more this evening.
Bogy
"Hardware eventually fails. Software eventually works" - Michael Hartung
From: "corvallis@peoplepc.com [diesel_mercedes]" <diesel_mercedes@yahoogroups.com>
To: diesel_mercedes@yahoogroups.com
Sent: Thursday, June 30, 2016 3:14 AM
Subject: RE: [diesel_mercedes] 240d engine in Jeep acting up
If there is any chance that water is getting into your oil, it should show as dropping oil pressure. I saw this once on a log truck. Stop immediately and look at the oil. If so, get towed to a place of repair. Bill in Oregon
From: diesel_mercedes@yahoogroups.com [mailto: diesel_mercedes@yahoogroups.com ]
Sent: Wednesday, June 29, 2016 10:16 PM
To: diesel_mercedes@yahoogroups.com
Subject: [diesel_mercedes] 240d engine in Jeep acting up [1 Attachment]
Tonight I am some combination of befuddled, encouraged, surprised, delighted, and cautiously optimistic. Let me 'splain. I came up with an idea to either prove or eliminate from consideration the possibility of a head gasket leak or a cracked head. Such a malady would not only add unwanted water into the combustion chamber at certain times in the cycle, but it would also force gas bubbles into the cooling jacket which would then find their way to the radiator. Seeing them is sometimes difficult so i came up with the device shown in the picture. This way any bubbles would rise through a relatively quite column of water and could more easily be seen. After an hour of idling the engine was up to temperature and had been for 30 minutes. Absolutely no sign of that steady stream of bubbles that would indicate a leak. But it was also not running rough either. Hmmmmm. This is a good thing to be sure and I think I know why. Last night I added a cup of Marvel Mystery Oil to both the crank case and the fuel. I have seen this stuff free up stuck valve lifters and return an engine that sounded like it had 3 loose rods to quiet smoothe runnings. Well it ran for a half hour or so last night and then I shut down. That got it circulated through both the oil and fuel systems where it could reside while dissolving sludge and varnish. And I think that is what must have happened. Since there was no leak into the cooling jacket that left rings, and valves. And as of this morning it occurred to me that it might also be an injection pump failure in that cylinders outlet. So I may have cured it by the use of the MMO. I will do this all again tomorrow and see if these results repeat. If it rins good for tomorrow's test I Will consider the issue closed. I won't ever know what was ultimately wrong. But I guess I will just have to live with that. I will let you know what happens. Peace.
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Posted by: "Atwood,Warren" <Warren.Atwood@altramotion.com>
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