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Simon Turnbull
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Leaking oil from the head gasket

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Top end set for first time on a cummins isx 2005 mileage 1.2m Oil use under a gallon every 25000miles, Mech report says oil leak from the head gasket recomends to replace and while in there to do a full inframe as the engine is so old. Head gasket work quote 40 hrs to do job. Runing synthetic with echo pure. Personaly I dont think any of this work needs to be done what do you guys and ladys think? Oil samples to date clear no sign of coolant or any metal wear, Cams are still good. Work done at Cummins

Edited by: Kevin Rutherford ( )

Thanks for the info Jackie will think about bringing the inframe forward now. Cheers

Simon Turnbull,

No problem, take care.

Jackie Wormley,

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Jackie Wormley
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Well I think it's just going to be personal prefrence on your part.

Back in 2005 I noticed coolant leaking out of the head gasket. It wasn't getting in the oil just leaking out. I also had oil leaking from somewhere that I couldn't tell where it was coming from. I did oil samples every oil change (12000 miles) and it never showed any coolant in the oil. I ran the truck for quite a while.

Then in December of 2005 I wanted to bring it in to Detroit to have the bearing checked, oil pan gasket replaced, and then the service done. The mechanic did an inspection and noted several oil leaks. I didn't like oil leaks so I wanted them to find out where they were coming from. They said they would put dye in the oil and next time in we could find them. I didn't know when I was going to be back so the suggested a dyno.

So they put the truck on the dyno and found out the oil was coming from the head gasket. Since it was leaking both oil and coolant I said just replace it. When they pulled the head they found out that my valves were sunk in the seats way past spec's. The said I could either run it or in frame it. I decided that since they already did the bottom end and they had the motor half way torn down to just have the in frame done. I had the money in the bank so why not.

I don't know if anything would ever show how the valves are besides just going in there. I didn't want to take a chance and sink a valve. I am glad I did the head gasket because if I didn't who knows what would have happened.

If I were in your shoes I would do it, you definitely got the life out of that motor. My in frame was done at 800,000 on a Detroit series 60 12.7L

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bill beasley
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I suggest that you run it till it shows signs of wear in the oil samples. The oil samples do not lie. Does the mechanic?

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Rick Williams
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Just wanted to throw this info out to you. I had a1999 ISM cummins, took it to the cummins shop to have the overhead run. They told me I was leaking oil from my head gasket. I didn't have the money to fix it at that time so I just let it go. I later found out after washing the entire engine and careful inspection that the leak was from the rocker box cover and it was dripping down over/past the head gasket making it appear to be the head gasket. The head sits on top of the block, then your rocker box sits on top of your head, then your valve cover sits on top of your rocker box. Any ways I agree with you. If your engine is running fine then run it. Maybe you'll get another year or so out of it before you have to tear into it.

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Kevin Halderman
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If you have a head gasket problem, only 1 thing to do, pull the head. I have had 2 trucks down this year with gasket problems. 1st was a 3406 cat w/ 700k on it from 1st in frame. 2nd was a mercedes with 750k no inframe. With the cat valves where sunk in the head, little cross hatch left in cylinders. So it was easy another inframe w/ remaned head. The 2nd pulled the heads 1,3,5 and 6 showed no wear issues heads and valves looked good, easy no inframe. Also the oil samples on both showed ok.

So my reality says plan for the worst. Hope for the best. Until you get the head off, <which on cummins 3 heads right? > no way to tell if you need an inframe. replacing 1 head gasket you may get 150k out before you need more internal work. So you can plan for future repairs better. GL

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justinshea
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This is a common problem on the cm870 which is anything from 04 to 06. My 06' W900 had the same problem. There is an oil return in the front and back of the head on the drivers side that leaks on most of them it starts around 450k to 550k. I wouldn't worry about it unless its leaking a large amount of oil. I believe its a 6k bill to have it fixed.

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Mike Stiffler
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My god. Its said that its $6,000 to repair. That's f crazy. According to a driver I talked to yesterday for $11,000 you can get the whole ##!% thing rebuilt. He just had his DD inframe done. Message me if you like. The rip offs have to be stopped.

By the way I have a slight leak in my head on the drivers side in the front.

Edited by: Mike Stiffler ( )

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snowdrifter
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Wow, your running synthetic oil, chances are your getting weeping 1gal oil @25000mi. is great...

go buy a dye test kit there about 19 buck comes with a black light wash engine real good drop the dye in in the oil run your truck for about 500mi. then shine the light on it follow the glow...Lucas sells syn oil additive it should stop the weeping.. and keep doing oil samples

Jackie 60s she caught the d dec fault in time they like to drop #5 valve's between 800-900k

Kevin if you had an Inframe done and its wore out at 700k I'd be having a good with the shop that did the work .... sounds to me they did the old oversize rings and bearing roll.... or they used non CAT parts....

Good to know on the valve fault, thanks. I also have a friend with a little over 900,000 on his DDEC IV with valves sunk in the seats also.

Jackie Wormley,

Okay my fellow O/Ops.. Topsets or valve jobs, tune ups This is a Must do service Heck its in the hand book from your engine Mfg. Why you ask? because the vales tighten or hammer into the seats if you ignore it the vale stem will extend past the keeper (that locks it into place) the keeper falls out and the vale drops into the cylinder. If you drop a valve around 400/500 thousand mile and did not do a valve set the engine Mfg has the choice not to warrenty it. Mostly in the past but now its a must to do a topset after 20/30 thou miles. because they set them tight when built to hammer the softer valve seats in. EGR thing, my die hart 60S just did a valve spring only replacement with injector cups because the valve were mint! 2mil on the head vale job every 300 thou. like going to church on sunday. Cummins engines need them too around the milage its not a Caterpillar thing this is what many believe, Sometimes its better to just rebuild your head than switch it out with a remand. you know its history..

snowdrifter,

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Your
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I just had my head gasket replaced on my 05 Six Cummins with 690000 miles they are unknown for leaking oil from the back of the engine so I had it done I replaced all upper gaskets and had over head ran the engine was in great shape. The onelyproblem I am having is the valve cover gasket keeps leaking, I have to tighten the bolted back up a couple times

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