Dale Hamilton Posted September 15, 2005 Share Posted September 15, 2005 I had just fired her up to move her from one shop to the other, and as soon as I had air pressure I noticed a pool of green coolant on the shop floor. I shut down and inspected all the usual things without avail. Absolutely no history of leaks or running hot- this all of a sudden. Really good size leak too. I finally trace it to the top of the engine- where the two valve covers meet in the middle of the head- there is maybe a quarter of an inch space here- and the fuel infector lines run thru the top of this space. Water seems to be hemorrhaging between these valve covers. Anybody seen this before?? Does it mean I've got a head gasket blown (no other indicators of that-yet)? Is ther a freeze plug in this location I can't see?Any help would be appreciated- I'd really like to run this thing to Cookville later this month.Dale Quote Link to comment https://www.bigmacktrucks.com/topic/368-big-time-water-leak-in-673-help/ Share on other sites More sharing options...
Lmackattack Posted September 15, 2005 Share Posted September 15, 2005 doesent sound good Dale... if there are no pipes over that aera it likely is a blown HG? I was just working on my 711 today had both valve covers off to paint and I did not notice any pipes/hoses there besides the injector lines. make shure you have a full radiator and check it wile its running to see if indeed the HG is leakinggood luckTrent Quote Link to comment https://www.bigmacktrucks.com/topic/368-big-time-water-leak-in-673-help/#findComment-1617 Share on other sites More sharing options...
HeyCharger Posted September 16, 2005 Share Posted September 16, 2005 I had just fired her up to move her from one shop to the other, and as soon as I had air pressure I noticed a pool of green coolant on the shop floor. I shut down and inspected all the usual things without avail. Absolutely no history of leaks or running hot- this all of a sudden. Really good size leak too. I finally trace it to the top of the engine- where the two valve covers meet in the middle of the head- there is maybe a quarter of an inch space here- and the fuel infector lines run thru the top of this space. Water seems to be hemorrhaging between these valve covers. Anybody seen this before?? Does it mean I've got a head gasket blown (no other indicators of that-yet)? Is ther a freeze plug in this location I can't see?Any help would be appreciated- I'd really like to run this thing to Cookville later this month.Dale←Hi Dale, You may want to check if your engine has a water gallery (for want of a better word) that runs the length of the engine, between the inlet manifold and the heads. Mine does and right in the middle of this gallery is a rubber joiner about 2" long and about 2 1/2" in diameter. I know because mine has just started to leak and I will have to replace it very soon. If the bonnet (hood) is still on, you may have to use a mirror to see what I'm describing.Hope it's only a minor hiccup for you.Rod. Quote Proud owner of;1961 Mack B61 prime mover.1981 International ACCO 1810C DualCab Fire Truck Link to comment https://www.bigmacktrucks.com/topic/368-big-time-water-leak-in-673-help/#findComment-1624 Share on other sites More sharing options...
b61mack Posted September 17, 2005 Share Posted September 17, 2005 Dale, there is a freeze plug on the end of the head,the old style has screw in plugs with Orings the newer style has drive in plugs. Ron Quote Link to comment https://www.bigmacktrucks.com/topic/368-big-time-water-leak-in-673-help/#findComment-1646 Share on other sites More sharing options...
Dale Hamilton Posted September 20, 2005 Author Share Posted September 20, 2005 thanks guys- I'm back now (from weekend travel). I'll pull the valve covers tonight and see if I can find either a rubber connector or a freeze plug. Will let you know- as I'll have to put out a call for the part(s). Quote Link to comment https://www.bigmacktrucks.com/topic/368-big-time-water-leak-in-673-help/#findComment-1695 Share on other sites More sharing options...
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