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| Engine oil in cooling system https://ausmini.com/forums/viewtopic.php?f=2&t=99309 |
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| Author: | AEG163job [ Sun Sep 15, 2019 6:28 pm ] |
| Post subject: | Engine oil in cooling system |
Hi Guys, Hope someone can help me with this. Just reBuilt a Mk2 Cooper S engine. There seems to be a large quantity of oil entering the cooling system from somewhere and I have run out of ideas as what is happening. First I thought it was a head gasket. Have tried two different gasket in addition to the original one, and re-newed all the studs with comp. one in case the originals had stretched. No luck. There is no water entering the sump at all, just oil entering the cooling system, so I'm convinced its not the head or block face, both of which were machined before re-assembly. Cylinder compression is good so I don't think its at cracked head either. Any suggestions gratefully received. Cheers. |
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| Author: | gtogreen1969 [ Sun Sep 15, 2019 7:10 pm ] |
| Post subject: | Re: Engine oil in cooling system |
Sometimes engines will do funny things and you can get oil in water and not water in oil or vise-versa. Obviously if you track the oil system there is the pressure feed side and drain side. For the oil to make it into the radiator in vast quantities i would be focusing on the pressure side. Pressurising the radiator to about 15psi with a test kit and with the engine off might give you water in the oil to help diagnose the leak. Check the pots, rocker area or crankcase for water or hissing. Oil in the coolant can take a while to flush out. Is there any chance it has been fixed and its just the remaining oil in the cooling system? Sorry i cant be of much more help. I just hope its not something serious like a crack or corrosion in the block. |
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| Author: | Goldbrocade_62 [ Sun Sep 15, 2019 7:18 pm ] |
| Post subject: | Re: Engine oil in cooling system |
Did you put engine coolant in straight away |
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| Author: | gtogreen1969 [ Sun Sep 15, 2019 7:36 pm ] |
| Post subject: | Re: Engine oil in cooling system |
There are some pics here that track the oil circuit - http://www.nonlintec.com/sprite/lubrication/ |
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| Author: | Goldbrocade_62 [ Sun Sep 15, 2019 7:55 pm ] |
| Post subject: | Re: Engine oil in cooling system |
Some times the brass plugs in head face give dramas too |
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| Author: | AEG163job [ Sun Sep 15, 2019 10:22 pm ] |
| Post subject: | Re: Engine oil in cooling system |
Goldbrocade_62 wrote: Did you put engine coolant in straight away Yes, as you normally would when starting up after a rebuild. Thanks. |
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| Author: | AEG163job [ Sun Sep 15, 2019 10:24 pm ] |
| Post subject: | Re: Engine oil in cooling system |
Goldbrocade_62 wrote: Some times the brass plugs in head face give dramas too Yes I did consider that. Perhaps I should have got it pressure tested before, but was hoping a fresh head gasket would solve it. |
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| Author: | AEG163job [ Sun Sep 15, 2019 10:27 pm ] |
| Post subject: | Re: Engine oil in cooling system |
gtogreen1969 wrote: There are some pics here that track the oil circuit - http://www.nonlintec.com/sprite/lubrication/ Thanks mate. Given the qty. of oil involved, I don't believe its due to a crack, The block was fine before re-honing. A pressure test of the cooling system is a good thought. I appreciate the responses. Pete |
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| Author: | Goldbrocade_62 [ Mon Sep 16, 2019 5:34 am ] |
| Post subject: | Re: Engine oil in cooling system |
AEG163job wrote: Goldbrocade_62 wrote: Did you put engine coolant in straight away Yes, as you normally would when starting up after a rebuild. Thanks. A engine builder told me a similar scenario they left the coolant out and water only to settle the head gasket for a little bit then put coolant back in |
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| Author: | timmy201 [ Mon Sep 16, 2019 9:51 am ] |
| Post subject: | Re: Engine oil in cooling system |
Goldbrocade_62 wrote: AEG163job wrote: Goldbrocade_62 wrote: Did you put engine coolant in straight away Yes, as you normally would when starting up after a rebuild. Thanks. A engine builder told me a similar scenario they left the coolant out and water only to settle the head gasket for a little bit then put coolant back in I do this too, and the gasket makers suggest the same. Fill with water for the break in period and then drain and swap to coolant |
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| Author: | AEG163job [ Mon Sep 16, 2019 1:38 pm ] |
| Post subject: | Re: Engine oil in cooling system |
Used ordinary water for the past to reinstallation of the head, rather than red coolant. So it does not appear to be the problem. May try a pressure test on the cooling system next, as GTO suggested. Thanks again guys. |
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