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Old 09-23-2011, 04:32 PM   #1 (permalink)
Shiny
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Oil in Water

And the saga continues...
Well the new (to me) 6.5 started getting a little hard to start and after having ruled out the gp's, I thought it was injectors but this morning I checked the oil and noticed it's over 1 litre low and was topped up only a couple hundred miles ago. So I stuck my finger in the coolant tank and it came out black!

I just finished replacing the oil cooler lines last week so I can rule out any contamination there. Where in this engine could this possibly happen? There is no coolant getting into the water.

Could it possibly be a head gasket? I don't see how non-pressurized oil in the head(s) could seep through a blowout in a head gasket into a pressurized cooling system.

Any ideas?
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Old 09-23-2011, 06:01 PM   #2 (permalink)
lost with out spark plugs
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Find ur block number. If it is a squrter it might have cracked oil gally to water jacket. Your oil lines go to a stand alone cooler if it is like mine. But if they go to the rad possible cooler.
I don't think pressurized oil goes through head gasket.
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Old 09-23-2011, 06:06 PM   #3 (permalink)
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Block number? Where is that? How will that help?
Yes the oil lines go to a stand alone cooler.
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Old 09-23-2011, 06:23 PM   #4 (permalink)
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There some blocks that are pron to crack due to metal that was taken out so that oil could spray the underside of the pistons. But most of the time the crack. Would be in the lower part of cylinders going from 1 through bearing web and in to the next. This most offten let's coolant into the oil. But a crack might go a little diffrent connecting oil passage to waterjacket.


The block number would tell if it sprays the pistons or not. I know they can be found in the vally just below the heads. I think that the last 3 of the full casting number also the same give it a few more post and if I am wrong some one will correct me. When you do have the block number post it.
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Old 09-23-2011, 09:06 PM   #5 (permalink)
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Oil pressure 40 to 100 psi, coolant 12 psi. Oil pressure to the rockers goes thru head gasket. I believe it is possible for oil to weep into coolant thru head gasket depending on passage configuration. As gasket gets worse, coolant will get into oil when engine is shut down and coolant is still pressurized.
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Old 09-23-2011, 10:19 PM   #6 (permalink)
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Quote:
Originally Posted by RustyCanuck View Post
Oil pressure 40 to 100 psi, coolant 12 psi. Oil pressure to the rockers goes thru head gasket. I believe it is possible for oil to weep into coolant thru head gasket depending on passage configuration. As gasket gets worse, coolant will get into oil when engine is shut down and coolant is still pressurized.
As far as I rember the rockets are lubed with the oil that comes from the lifters through the push rods.
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Old 09-23-2011, 10:22 PM   #7 (permalink)
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ooohh that is not good.....I hate to say it but that sounds like a block to me as well. I hope for your sake I am wrong. Pull the heads, you got nothing to lose now.
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Old 09-23-2011, 10:24 PM   #8 (permalink)
Shiny
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Ya that sounds good but doesn't oil under pressure go up through the push rods and weep down no longer under pressure? I don't know if there is any other way for oil to go up into the head.

woops, a little late

Last edited by Shiny; 09-23-2011 at 10:25 PM.
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Old 09-23-2011, 10:26 PM   #9 (permalink)
Shiny
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Ya I think I've lucked out and found shelter with power to start working on it. Do you think a leak down test would answer any questions?
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Old 09-23-2011, 10:35 PM   #10 (permalink)
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Quote:
Originally Posted by Shiny View Post
Ya I think I've lucked out and found shelter with power to start working on it. Do you think a leak down test would answer any questions?
NO. I think that this might be a magor pain in the ass to pin point and prove. I sorry I don't wish to be right but you must consider it. If you pull the heads have you done enough head gaskets to read them? Or will you just blindly throw new gaskets and cross your fingers?
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kevin
pontiac mi
95 k1500,4L80E
2nd owner of my fathers 95 k1500 chevy. down pipe, chip, gages (trans temp, pyro, boost), hd planets in trans, 3rd trans cooler, 3.73 posi,alcohol and water inj. gutted intake, homemade air ride, home made turbo master,
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