93 Mack E7 350 water in oil - TheDieselGarage.com
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Old 12-15-2006, 03:46 AM   #1
2006copperPSD
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93 Mack E7 350 water in oil

Hope someone can help me here. I have a 93 E7 350 8LL Superliner that I just recently noticed my coolant level way low and checked my oil and it's way up. So I guess a head gasket is my problem here. The truck idles a lot on jobsites and it does have 580K miles but engine was rebuilt at about 525k miles. I bought the truck with 552k, it does not smoke, starts right up in cold weather without plugging it, no power loss.

Do you think it's the head gaskets. A few years ago I had a friend with an older EM6 300hp and I think it was something to do with a oil cooler gasket, not sure, but it did the opposite it filled his radiator with oil.

Any help is greatly appreciated and if it leads to be the head gaskets is this a known problem with the earlier E-7's and how hard of a job with the jacobs on top:thanks:

I have a 1989 E6 350 12sp Superliner and I ran it for 8 straight years and now all it needs is a clutch(thank you my 6 month old driver, keep your foot off it and take off in first not fifth and it would have lasted longer)
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1993 Mack RW713 Superliner E7-350 Jacobbs Jake 8LL 20/58 Camelback 12R 24.5 Tandem Dump(12-15-06 586,000 miles)

1989 Mack RW713 Superliner E6-350 Dynatard 12sp 20/58 Camelback 11R 24 Tandem Dump(12-15-06 317,000 miles)

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Old 12-15-2006, 03:58 AM   #2
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did you check the oil hot or cold, because if your in some cold weather you can have condensation there and it appears to be coolant, but if you checked it hot disreguard this post.
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Old 12-15-2006, 04:02 AM   #3
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cracked oil cooler is a possibility but like you said oil likely will make its way into the water as the oil has more psi behind it.

its possible to have HG failure but if it was that bad I would think you could see oil/water leaking around the heads someware???

FJH will know where ya at FRED~~!!!!
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Old 12-15-2006, 01:49 PM   #4
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Thanks guys, I have oil coming down from the top of the head under the jacobs. Jacobs gasket is leaking I have to wash it down good and see if it also leaks at the head gasket. The oil dipstick is about 1 1/2 inches above the max line and I put in a gallon of antifreeze and it's gone and more.

I'm gonna drain all the oil and put in fresh than keep it off. The water seemed to leak into the oil with the engine sitting off for about 2 months oil was fine before it sat. I have all winter to take care of this but I would like to do it myself if possible. Thanks again.
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1993 Mack RW713 Superliner E7-350 Jacobbs Jake 8LL 20/58 Camelback 12R 24.5 Tandem Dump(12-15-06 586,000 miles)

1989 Mack RW713 Superliner E6-350 Dynatard 12sp 20/58 Camelback 11R 24 Tandem Dump(12-15-06 317,000 miles)

1996 Cat 416B 4X4 Ext-hoe (12-15-06 6,200 hrs)
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Old 12-16-2006, 04:25 AM   #5
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Several possibilities come to mind-

Head gasket(s)

cracked head(s)

oil cooler issue

liner o-ring(s) leaking

We have a '95 CH with a E7-350. Over 900k miles, and as far as I can tell, it has never been opened up.
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Old 12-16-2006, 12:24 PM   #6
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Quote:
Originally Posted by bmoeller
Several possibilities come to mind-

Head gasket(s)

cracked head(s)

oil cooler issue

liner o-ring(s) leaking

We have a '95 CH with a E7-350. Over 900k miles, and as far as I can tell, it has never been opened up.
Drain the oil pull the pan and preasure test the cooling system!
You likly have leaky liners.
Or as the above post mentioned any of the above!
Most of all don't run it like that!

By the way The E7 Does not have liner Orings!They use silastic or anarobic sealant on the counter bore!
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Old 12-17-2006, 12:30 AM   #7
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Be careful Fred, 93 was the year they changed and went away from the o-rings if memory serves me. I have pulled a few 93's down that had them.

You will have leaking liners causing this problem with out a doubt. The block counterbores will need to be cut most likely. Also, watch out if you do a patch job and only want to repair the one that is leaking. Chances are that it may have flat fire ringed liners and you can not get them any more. if that is the case and you only want to fix the one, you will have to replace all liners under that head to convert to the stepped fire ring grove liners. I wish I had a nickle for every counter bore job I did. Oh wait, they paid me by the hour plus commision so I guess I got more than a nickle for all of them I did
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Old 12-17-2006, 04:16 AM   #8
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Quote:
Originally Posted by DmaxEter
Be careful Fred, 93 was the year they changed and went away from the o-rings if memory serves me. I have pulled a few 93's down that had them.

You will have leaking liners causing this problem with out a doubt. The block counterbores will need to be cut most likely. Also, watch out if you do a patch job and only want to repair the one that is leaking. Chances are that it may have flat fire ringed liners and you can not get them any more. if that is the case and you only want to fix the one, you will have to replace all liners under that head to convert to the stepped fire ring grove liners. I wish I had a nickle for every counter bore job I did. Oh wait, they paid me by the hour plus commision so I guess I got more than a nickle for all of them I did
True Pat, I forgot they started out that way!
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Old 12-17-2006, 04:49 AM   #9
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this is starting to look a bit more serious. Where should I start. Should I drain oil and do the coolant pressure test, or is it a guaranteed take apart and work on the heads.
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1993 Mack RW713 Superliner E7-350 Jacobbs Jake 8LL 20/58 Camelback 12R 24.5 Tandem Dump(12-15-06 586,000 miles)

1989 Mack RW713 Superliner E6-350 Dynatard 12sp 20/58 Camelback 11R 24 Tandem Dump(12-15-06 317,000 miles)

1996 Cat 416B 4X4 Ext-hoe (12-15-06 6,200 hrs)
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Old 12-17-2006, 01:34 PM   #10
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Takes an hour or less to pull the pan!Id be doing that first That will let you see where the water is geting in hopfully! don't waste your time changing the oil!No the older engines I have seen the heads crack at the frost plugs between the heads ,the most comon leak externaly there is the hose on the water rail between the two heads.Like Said of its the oring style you may have to have the counter bore re cut and it may mean a tow job to your local Mack dealler hopfully equiped with the tools to do this phone around.
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