All of a sudden ....

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Model T Ford Forum: Forum 2012: All of a sudden ....
Top of pagePrevious messageNext messageBottom of page Link to this message  By George Clipner-Los Angeles on Thursday, September 13, 2012 - 03:11 am:

Brought my T to SoCal finally, after 4 yrs. Drove it around for two weeks before transporting. Ran well, but small leak in rad. was getting worse. So today I was trying to plug the leak. Drained rad. and discovered what looks like oil in the coolant. Haven't checked the engine for water yet and will do that tomorrow. History: engine professionally rebuilt 6yrs ago and has approx. 4g's on it. 280 cam and z head installed at time of rebuild. I'll check torque on it tomorrow also. Don't know if dad had re torqued after rebuild. Any thoughts ?? Praying it's not a cracked block.


Top of pagePrevious messageNext messageBottom of page Link to this message  By Roger Karlsson, southern Sweden on Thursday, September 13, 2012 - 04:08 am:

Do you have an accessory water pump? Oil/grease from there would be the first suspect. If the leaking water somehow disappeared into the engine below the pistons you should have milky looking oil in the engine. Did you get a lot of white smoke from the exhaust? That's what you get if you have some water leaking into the combustion chamber.
Oil leaking into the coolant from the engine is more likely when you have overhead valves and oil distribution to the head, not so common in a T.


Top of pagePrevious messageNext messageBottom of page Link to this message  By Ron Dupree on Thursday, September 13, 2012 - 08:20 am:

Our '24 sedan had rusted through the water jacket in the valve area, allowing coolant into the valve chamber and on into the crankcase. Needless to say, I found the leak AFTER a rather expensive rebuild.

Ron Dupree


Top of pagePrevious messageNext messageBottom of page Link to this message  By George Clipner-Los Angeles on Thursday, September 13, 2012 - 01:53 pm:

I've seen oil and water in crankcases before , looks like milk chocolate. I'll check that later today. Curious though.


Top of pagePrevious messageNext messageBottom of page Link to this message  By Jerry VanOoteghem on Thursday, September 13, 2012 - 04:28 pm:

George,

It would be virtually impossible to get crankcase oil into your coolant. There is just no avenue for one to reach the other. Coolant in oil however is a little easier.

If your head gasket leaks some, you could get some oily soot floating on top of your coolant.


Top of pagePrevious messageNext messageBottom of page Link to this message  By George Clipner-Los Angeles on Friday, September 14, 2012 - 01:30 am:

Jerry, that's what I couldn't understand, ther is just no way for it to do that. When I checked the coolant as I pulled it out of storage it was clean.
I tried two bottles of stop leak but it didn't look like that. Unless someone was playing a trick on me, I just don't know. I have cleaned it out somewhat. Used a putty like patch on leak and it is holding, I've used some Calgon to clean out the oil and will flush it out. We'll keep an eye on it.
Geo n L.A.


Top of pagePrevious messageNext messageBottom of page Link to this message  By Aaron Griffey, Hayward Ca. on Friday, September 14, 2012 - 01:37 am:

Torque the head to 45 and see what happens.
You need to do that anyway.


Top of pagePrevious messageNext messageBottom of page Link to this message  By George Clipner-Los Angeles on Friday, September 14, 2012 - 01:50 am:

Yep Aaron, I remember yer advice at 45 from previous posts. Oh by the way , how the hell are ye. (hijacking my own post, lol)
Geo n L.A.


Top of pagePrevious messageNext messageBottom of page Link to this message  By David Stroud on Friday, September 14, 2012 - 04:46 am:

I torque my heads to 55 ft.lbs. No problems. Dave


Top of pagePrevious messageNext messageBottom of page Link to this message  By John Zibell on Friday, September 14, 2012 - 09:39 am:

For a Z head, the manufacturer recommends 45-50 lb-ft. I like using 50. 55 is good for a cast iron head.


Top of pagePrevious messageNext messageBottom of page Link to this message  By Norman T. Kling on Friday, September 14, 2012 - 10:51 am:

I disagree that it would be nearly impossible to get oil into the coolant. One way has been addressed, a waterpump. The other way is a compression leak into the water jacket. This can came from a crack in the block or head. The crack would go into the compression chamber. It could also be caused by a leaky head gasket. What happens is that oil from the pistons is blown by compression into the water jacket. yes there is some oil which gets through the rings into the combustion chamber. The amount of oil would depend on how worn the cylinders and rings are. It could also happen on a recently rebuilt engine, before the rings seat. Some cracks expand with heat and contract with cold, so there could be more oil going into the coolant than coolant into the crankcase. The compression chamber is under pressure, but the coolant is not under pressure.
Norm


Top of pagePrevious messageNext messageBottom of page Link to this message  By Royce in Dallas TX on Friday, September 14, 2012 - 12:03 pm:

55 pounds of torque will normally pull the threads right out of early blocks. Might be OK for blocks cast in the 1920's. For sure too much for anything cast by the Dodge Brothers.


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