possible blown HG?

MA70-3.0GT · 11-20-2009, 12:42 PM

Just a thought, could the gunk be the result of mixed coolant types?
It's definitely worth following Bill's advice of flushing the system through & refilling either way because if it is oil then it'll start to damage the rubber coolant pipes & there's a few that are a complete pig to get at.

A compression test would probably show if the HG was on it's way out, and if you get on well with a local garage you could ask them to put the exhaust analyser probe into the top of the radiator (although not immersed in the coolant!) to see if there's any combustion gasses getting into the cooling system.

11-20-2009, 12:42 PM	#3
MA70-3.0GT 12psi boost Join Date: Oct 2009 Location: Crewe, England Posts: 356	Just a thought, could the gunk be the result of mixed coolant types? It's definitely worth following Bill's advice of flushing the system through & refilling either way because if it is oil then it'll start to damage the rubber coolant pipes & there's a few that are a complete pig to get at. A compression test would probably show if the HG was on it's way out, and if you get on well with a local garage you could ask them to put the exhaust analyser probe into the top of the radiator (although not immersed in the coolant!) to see if there's any combustion gasses getting into the cooling system. __________________ '89 MA70 Supra GT aero 3.0turbo JDM, Rebuilt motor, K&N intake, 3" stainless turbo-back. New turbo and braided line kit... '89 Honda NC27 400, NC23 cams, open pipe, PC36a shock & possibly Showa USD forks... '83 Yamaha 29R XJ750E-II, number 69 off the line, only runner in the country? Original except Koni shocks '95 Honda PC26 CB500R, Winter hack, hateful, trying to sell it I'm not paranoid, they really ARE after me!!!