jake Posted September 21, 2008 Share Posted September 21, 2008 Tonite I pulled the oil pan on the 711 to see where the antifreeze was coming from. It was easy to see. It was dripping off #2 main bearing bolt. When I followed it up I could see it was coming from a passage in the block at # 2 cylinder above the cam next to the cam follower. I was wondering if someone could tell me where this passage leads and what sould I look for when I remove the heads. Thanks. jakebake Quote Link to comment https://www.bigmacktrucks.com/topic/4227-antifreeze-in-the-oil/ Share on other sites More sharing options...
theakerstwo Posted September 21, 2008 Share Posted September 21, 2008 Tonite I pulled the oil pan on the 711 to see where the antifreeze was coming from. It was easy to see. It was dripping off #2 main bearing bolt. When I followed it up I could see it was coming from a passage in the block at # 2 cylinder above the cam next to the cam follower. I was wondering if someone could tell me where this passage leads and what sould I look for when I remove the heads. Thanks. jakebake If you could post a photo of the pasage that you are talking about it would be better for us to tell were it is coming from.If it is coming from above the cam it may be a headgasket or a crack in the block. I still remember some info on that engine but with out knowing which passage it will be hard. I would pull the rocker and push tubes and look down that way with a good light. If the side plates are leaking oil then it would be a good time to pull them and that way you may see were the leak is coming from. glenn Quote glenn akers Link to comment https://www.bigmacktrucks.com/topic/4227-antifreeze-in-the-oil/#findComment-22180 Share on other sites More sharing options...
fjh Posted September 21, 2008 Share Posted September 21, 2008 If you could post a photo of the pasage that you are talking about it would be better for us to tell were it is coming from.If it is coming from above the cam it may be a headgasket or a crack in the block. I still remember some info on that engine but with out knowing which passage it will be hard. I would pull the rocker and push tubes and look down that way with a good light. If the side plates are leaking oil then it would be a good time to pull them and that way you may see were the leak is coming from. glennIf its not a head gasket I beleive you'll find you have cavitated block not totaly un heard of on these older engines!Pull the side coves that should tell the tale! Quote Link to comment https://www.bigmacktrucks.com/topic/4227-antifreeze-in-the-oil/#findComment-22189 Share on other sites More sharing options...
jake Posted September 22, 2008 Author Share Posted September 22, 2008 If its not a head gasket I beleive you'll find you have cavitated block not totaly un heard of on these older engines!Pull the side coves that should tell the tale!Thanks for the replies. Today I took off the front head and it looked likeit was leaking between the heads also. Hoever we can't see any thing wrong with the gasket. Tomorrow I will take the head in to have it tested for a crack. I left the block level full of antifreeze and will look for any trace on the bottom. Maybe will get time to pull the other head also. Will order new gakets this week too. Thanks. jakebrake Quote Link to comment https://www.bigmacktrucks.com/topic/4227-antifreeze-in-the-oil/#findComment-22201 Share on other sites More sharing options...
jake Posted September 24, 2008 Author Share Posted September 24, 2008 Thanks for the replies. Today I took off the front head and it looked likeit was leaking between the heads also. Hoever we can't see any thing wrong with the gasket. Tomorrow I will take the head in to have it tested for a crack. I left the block level full of antifreeze and will look for any trace on the bottom. Maybe will get time to pull the other head also. Will order new gakets this week too. Thanks. jakebrakefjh I think you're right. It is the block that is leaking. Ihave the block setting with antifreeze in it and it keeps leaking out the bottom. My nephew has a scope and we are going to look down a push tube hole and see what we find. Have you ever repaired a cavitated block? jakebrake Quote Link to comment https://www.bigmacktrucks.com/topic/4227-antifreeze-in-the-oil/#findComment-22234 Share on other sites More sharing options...
theakerstwo Posted September 24, 2008 Share Posted September 24, 2008 fjh I think you're right. It is the block that is leaking. Ihave the block setting with antifreeze in it and it keeps leaking out the bottom. My nephew has a scope and we are going to look down a push tube hole and see what we find. Have you ever repaired a cavitated block? jakebrake I have seen them and the old 673 crack between 1 and 2 behind the front side plate at the top of the plate opening almost to high to repair . If it is not too high the use the lock/n/stitch prosess. to repair and that will be all you can do.Dont try to weld it . You will only make more cracks. Some times the head bolt holes will be cracked down but can say i ever saw one leak coolant down. glenn Quote glenn akers Link to comment https://www.bigmacktrucks.com/topic/4227-antifreeze-in-the-oil/#findComment-22236 Share on other sites More sharing options...
jake Posted September 25, 2008 Author Share Posted September 25, 2008 glenn, Tonite I removed the right fender, injector pump, and side cover. Icould see some crusty looking sluge right behind the tube that runs from the top of the block to the cam. After I clean and dried the area behind the tube it would slowly turn wet again. I think that has to be the place because I can follow a crusty white trail from there all the way down to the main bearing cap. I think the block had been treated with stop leak a quite a few times. I am wondering if epoxy would repair it? Do you know if that tube can be removed to make a repair easier? Thanks. jakebrake Quote Link to comment https://www.bigmacktrucks.com/topic/4227-antifreeze-in-the-oil/#findComment-22254 Share on other sites More sharing options...
theakerstwo Posted September 25, 2008 Share Posted September 25, 2008 glenn, Tonite I removed the right fender, injector pump, and side cover. Icould see some crusty looking sluge right behind the tube that runs from the top of the block to the cam. After I clean and dried the area behind the tube it would slowly turn wet again. I think that has to be the place because I can follow a crusty white trail from there all the way down to the main bearing cap. I think the block had been treated with stop leak a quite a few times. I am wondering if epoxy would repair it? Do you know if that tube can be removed to make a repair easier? Thanks. jakebrake That is the later block because the first block had a cast iron tube which was part of the block and it would crack and let oil leak out and there was a tube that could be installed from the top to repair and then the later block had a replaceable tube that come in from the top but never did see one replaced. That may be too old for your mack dealer to help you with but i just dont know who would have a replacement tube and tool for it. That tube transferes oil to the heads that you see. You may need a engine . I would heat that area with a torch some and take a another look and see it it is were the tube come down out of the block but i still dont know were you will find a repair for it.If you find for sure were it is coming from call these guys because they did alot of block repairs but have gone to larger engines but some one there can help you as far as info on the repair method. 918 4461828 http://www.memorialmachine.com/mm/ Quote glenn akers Link to comment https://www.bigmacktrucks.com/topic/4227-antifreeze-in-the-oil/#findComment-22260 Share on other sites More sharing options...
fjh Posted September 26, 2008 Share Posted September 26, 2008 That is the later block because the first block had a cast iron tube which was part of the block and it would crack and let oil leak out and there was a tube that could be installed from the top to repair and then the later block had a replaceable tube that come in from the top but never did see one replaced. That may be too old for your mack dealer to help you with but i just dont know who would have a replacement tube and tool for it. That tube transferes oil to the heads that you see. You may need a engine . I would heat that area with a torch some and take a another look and see it it is were the tube come down out of the block but i still dont know were you will find a repair for it.If you find for sure were it is coming from call these guys because they did alot of block repairs but have gone to larger engines but some one there can help you as far as info on the repair method. 918 4461828 http://www.memorialmachine.com/mm/I have never seen one of these leak before so Glen's solution is your only option! Quote Link to comment https://www.bigmacktrucks.com/topic/4227-antifreeze-in-the-oil/#findComment-22284 Share on other sites More sharing options...
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