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Brown Sludge on Radiator Cap

 
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Kiwi Cortina



Joined: 20 Dec 2011
Posts: 273
Location: Novato Ca

PostPosted: Sun Jun 28, 2015 8:34 am    Post subject: Brown Sludge on Radiator Cap Reply with quote

I have now done nearly 700 miles on my MK2 rebuild and the other day I was doing a fluid level check and notice a brown sludge like substance on the radiator cap. The radiator is new. Also I am having trouble with the oil cap/ breather on top of the rocker, it lets oil blow out and some times the cap blows right off. Any suggestions.

Thanks
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peteleo



Joined: 24 Aug 2008
Posts: 877
Location: San Mateo,California

PostPosted: Sun Jun 28, 2015 12:28 pm    Post subject: Reply with quote

Brent,

It sounds like the crankcase ventilation is plugged. Check the PCV valve first. The plunger needs to be spring loaded.
Most likely the canister is the culprit. It is sometimes neglected. Usually inside will have slug causing the oil return baffle to plug. Soak it in degreaser for a day which should loosen all the slug. The canister after that will weigh half as much as before. Pete
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Kiwi Cortina



Joined: 20 Dec 2011
Posts: 273
Location: Novato Ca

PostPosted: Sun Jun 28, 2015 12:55 pm    Post subject: Reply with quote

Thanks Pete. Pulled it off and put it in degreaser and already crap is coming out. Now that should help with the oil cap, but will it help with the brown sludge in the radiator?
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peteleo



Joined: 24 Aug 2008
Posts: 877
Location: San Mateo,California

PostPosted: Sun Jun 28, 2015 7:17 pm    Post subject: Reply with quote

Are you using a stop leak chemical in the radiator ?
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Kiwi Cortina



Joined: 20 Dec 2011
Posts: 273
Location: Novato Ca

PostPosted: Sun Jun 28, 2015 8:02 pm    Post subject: Reply with quote

No.
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peteleo



Joined: 24 Aug 2008
Posts: 877
Location: San Mateo,California

PostPosted: Sun Jun 28, 2015 8:14 pm    Post subject: Reply with quote

I suspect some chemical is reacting with the coolant. There may be some crap left over from the heater element.
I would flush the system with clean water and then drive the car around for a couple of days and see if the problem comes back. If it doesn't, you can then add coolant.
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Kiwi Cortina



Joined: 20 Dec 2011
Posts: 273
Location: Novato Ca

PostPosted: Sun Jun 28, 2015 10:29 pm    Post subject: Reply with quote

Thanks Pete. I will give that a try.
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