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Hi, my name is Tiff and I have a problem with my 1993 4Runner 3ltr TD ( KZN 130 engine ).
Even from cold, the coolant is being blown out at higher revs. The coolant tested positive for exaust gasses.
Prior to having this problem, a new radiator had been fitted. I have now fitted a new cylinder head ( old one cracked ), new thermostat and checked the water pump for wear and hoses for obstructions (all ok).
On the first test run, going up a steep hill at highish revs, the water suddenly blew out and I ended up with the new head warping.This was then refaced. On re assembly with more new gaskets, I still have the same problem. The head was again removed and crack tested, proved ok. As far as I can tell at the moment, the bores do not appear to have cracked and the top of the block is not warped or cracked.
As the turbo has a water cooled bearing, is it possible for the exaust gasses to get into the cooling system via this?
Any ideas will be appreciated, Tiff Amsdon
Even from cold, the coolant is being blown out at higher revs. The coolant tested positive for exaust gasses.
Prior to having this problem, a new radiator had been fitted. I have now fitted a new cylinder head ( old one cracked ), new thermostat and checked the water pump for wear and hoses for obstructions (all ok).
On the first test run, going up a steep hill at highish revs, the water suddenly blew out and I ended up with the new head warping.This was then refaced. On re assembly with more new gaskets, I still have the same problem. The head was again removed and crack tested, proved ok. As far as I can tell at the moment, the bores do not appear to have cracked and the top of the block is not warped or cracked.
As the turbo has a water cooled bearing, is it possible for the exaust gasses to get into the cooling system via this?
Any ideas will be appreciated, Tiff Amsdon