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#1
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Antifreeze in oil
I recently had an oil analysis done after changing my oil before winter.
They found a significant amount of antifreeze backed up by my having to add some during the last part of the season. It's a 1987 5.7L GMC with closed cooling and 770 hours. It uses no oil and runs great. I'm trying to determine the possible causes. I've heard: 1. Cracked block 2. Cracked head 3. Bad head gasket 4. Bad frost plug 5. Bad coolant pump (supposedly located on pop of the engine by the manifold) Any other ideas? Capt. jeff |
#2
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Tamaroak wrote:
I recently had an oil analysis done after changing my oil before winter. They found a significant amount of antifreeze backed up by my having to add some during the last part of the season. It's a 1987 5.7L GMC with closed cooling and 770 hours. It uses no oil and runs great. I'm trying to determine the possible causes. I've heard: 1. Cracked block 2. Cracked head 3. Bad head gasket 4. Bad frost plug 5. Bad coolant pump (supposedly located on pop of the engine by the manifold) Any other ideas? Capt. jeff Do a compression test / cooling system leak down test. You have probably a tiny headache in your gasket. Good luck. The pressure cap on your radiator(?) has been leaking exhaust. Or, you have a crack. X-ray, epoxy weld. Relieve end of crack with a 1/64" drill Don't bother planing the head unless the machine shop can show you a warp. each guage is 20 bucks. It will save you paying a safari chasing a golden goose. Only a girly man would do otherwise. Go, Arnold! (I really don't know anything about his "views.") Terry K |
#3
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In article ,
Tamaroak wrote: I recently had an oil analysis done after changing my oil before winter. They found a significant amount of antifreeze backed up by my having to add some during the last part of the season. It's a 1987 5.7L GMC with closed cooling and 770 hours. It uses no oil and runs great. I'm trying to determine the possible causes. I've heard: 1. Cracked block 2. Cracked head 3. Bad head gasket 4. Bad frost plug 5. Bad coolant pump (supposedly located on pop of the engine by the manifold) Any other ideas? Capt. jeff I would discount 4 & 5, as a frost plug doesn't lead to the Base oil pan, and water pumps aren't Base oil lubricated, so it also doesn't lead to the oil pan. I would first look at Head Gasket, then look at cracked head and finally cracked block. Cracked block would not happen in the middle of the season, unless you had a Coolant FREEZE during that time period, Cracked head, maybe, but still very unlikely for the same reasons, except could happen if you overheated the engine recently. Bad Head Gasket can happen anytime, and is also not to hard to deal with, except it will require a topend disassembly, which is also what is required for a cracked head. Cracked block will require a complete engine removal. Bruce in alaska -- add a 2 before @ |
#4
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Bruce makes a good point. one other thing is that you could have a cracked
head...but not causing any noticable performance difference. it IS possible for a head to have a ever so minute crack in a water chamber that would cause coolent to leak (under pressure) down an oil return hole, or pushrod hole. One thing you could do is pull the spark plugs and examine them. if coolant IS getting into sa cylinder, then a spark plug check can tell many tales, and show you a cylinder you are having trouble with. Tim I would first look at Head Gasket, then look at cracked head and finally cracked block. Cracked block would not happen in the middle of the season, unless you had a Coolant FREEZE during that time period, Cracked head, maybe, but still very unlikely for the same reasons, except could happen if you overheated the engine recently. Bad Head Gasket can happen anytime, and is also not to hard to deal with, except it will require a topend disassembly, which is also what is required for a cracked head. |
#5
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Most common reason is a blown head gasket, then a rare cracked block or
cracked head. Easy to verify without disassembling engine: go to auto parts / speed shop. Get some carbon monoxide test tablets and put into radiator, run engine for several hours, shine 'black' (UV) light into radiator and look for fluorescence caused by the indicator chemical (tablets above) when it binds with the CO. If you run hard and 'shut down fast' without letting the engine self cool by idling back to normal temps .... then expect a blown head gasket. Of course you probably dont retorque the head bolts yearly like you should if you are running a lot of WOT. In article , BSCHNAUTZ wrote: Bruce makes a good point. one other thing is that you could have a cracked head...but not causing any noticable performance difference. it IS possible for a head to have a ever so minute crack in a water chamber that would cause coolent to leak (under pressure) down an oil return hole, or pushrod hole. One thing you could do is pull the spark plugs and examine them. if coolant IS getting into sa cylinder, then a spark plug check can tell many tales, and show you a cylinder you are having trouble with. Tim I would first look at Head Gasket, then look at cracked head and finally cracked block. Cracked block would not happen in the middle of the season, unless you had a Coolant FREEZE during that time period, Cracked head, maybe, but still very unlikely for the same reasons, except could happen if you overheated the engine recently. Bad Head Gasket can happen anytime, and is also not to hard to deal with, except it will require a topend disassembly, which is also what is required for a cracked head. |
#6
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#7
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Captain? Jeff,
Numbers 1 through 3 are possible, I do not believe 4 & 5 could possibly have anything to do with coolant in the oil. Without more info I would suspect first the blown head gasket. It would not take much oil in the coolant to be significant in an analysis. I would be curious as to where the oil is around a frost/freeze plug that it could get into the oil. Capt. Rich "Tamaroak" wrote in message ... I recently had an oil analysis done after changing my oil before winter. They found a significant amount of antifreeze backed up by my having to add some during the last part of the season. It's a 1987 5.7L GMC with closed cooling and 770 hours. It uses no oil and runs great. I'm trying to determine the possible causes. I've heard: 1. Cracked block 2. Cracked head 3. Bad head gasket 4. Bad frost plug 5. Bad coolant pump (supposedly located on pop of the engine by the manifold) Any other ideas? Capt. jeff ----== Posted via Newsfeeds.Com - Unlimited-Uncensored-Secure Usenet News==---- http://www.newsfeeds.com The #1 Newsgroup Service in the World! 100,000 Newsgroups ---= East/West-Coast Server Farms - Total Privacy via Encryption =--- |
#8
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Some more suspects.
1 Block off plate between riser and manifold 2 Exhaust manifold 3 Intake manifold or gasket JIMinFL "Rich Schultz" wrote in message ... Captain? Jeff, Numbers 1 through 3 are possible, I do not believe 4 & 5 could possibly have anything to do with coolant in the oil. Without more info I would suspect first the blown head gasket. It would not take much oil in the coolant to be significant in an analysis. I would be curious as to where the oil is around a frost/freeze plug that it could get into the oil. Capt. Rich "Tamaroak" wrote in message ... I recently had an oil analysis done after changing my oil before winter. They found a significant amount of antifreeze backed up by my having to add some during the last part of the season. It's a 1987 5.7L GMC with closed cooling and 770 hours. It uses no oil and runs great. I'm trying to determine the possible causes. I've heard: 1. Cracked block 2. Cracked head 3. Bad head gasket 4. Bad frost plug 5. Bad coolant pump (supposedly located on pop of the engine by the manifold) Any other ideas? Capt. jeff ----== Posted via Newsfeeds.Com - Unlimited-Uncensored-Secure Usenet News==---- http://www.newsfeeds.com The #1 Newsgroup Service in the World! 100,000 Newsgroups ---= East/West-Coast Server Farms - Total Privacy via Encryption =--- |
#9
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Tamaroak wrote in message ...
I recently had an oil analysis done after changing my oil before winter. They found a significant amount of antifreeze backed up by my having to add some during the last part of the season. It's a 1987 5.7L GMC with closed cooling and 770 hours. It uses no oil and runs great. I'm trying to determine the possible causes. I've heard: 1. Cracked block 2. Cracked head 3. Bad head gasket 4. Bad frost plug 5. Bad coolant pump (supposedly located on pop of the engine by the manifold) Any other ideas? Capt. jeff Jeff, you forgot the intake manifold. A bad gasket or a crack can cause coolant to leak into the engine. John |
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