redward Posted May 6, 2018 Share Posted May 6, 2018 I just picked up a 1998 RD690, with a 275HP E7. I drove it home and noticed fluid on the block.. It appears to be coming from the manifold, that returns the coolant back to the rad. The dual plastic tanks are empty and the coolant looks discolored, when wiped with paper towel. I will send out an oil sample to see if there is an internal leak. Can anyone add any insight or history of the same occurrence? The truck was last licenced back in 2014, oil change info was at 16,000 and it now has 16,717. It runs well, doesn't smoke, it pulls OK, but it is a cab and chassis, so no load. Rod Quote Link to comment https://www.bigmacktrucks.com/topic/53308-visible-coolant-leak/ Share on other sites More sharing options...
fjh Posted May 6, 2018 Share Posted May 6, 2018 (edited) Could be the hose between the coolant manifold peices ! Very Common on a cold engine !A little more info would help! note that if the coolant has black oil in it it could have a failed engine oil cooler If it has yellowish look to it it can be a failed trans or fuel cooler If so equipped! Edited May 6, 2018 by fjh Quote Link to comment https://www.bigmacktrucks.com/topic/53308-visible-coolant-leak/#findComment-398404 Share on other sites More sharing options...
redward Posted May 8, 2018 Author Share Posted May 8, 2018 Thanks The truck sat for over 3 years. We drove it a bit and there doesn't appear to be any coolant on the engine block. Thanks for your help. We will closely watch. I will be doing a full service and will submit an oil sample. I wasn't sure what info is required; please advise. Quote Link to comment https://www.bigmacktrucks.com/topic/53308-visible-coolant-leak/#findComment-398556 Share on other sites More sharing options...
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