Nigel Riches Posted June 9, 2021 Share Posted June 9, 2021 G'day from the farside, I have had a problem, of water being expelled from the cooling system, on my Black top zetec motor, I have removed the cylinder head, had the head tested for flatness and a leak check and a hardness check, the head sealing surface was given a very light cut, to remove any surface irregularities, all the previous came back OK installed a new head gasket and new bolts, the problem is still manifest.Some back ground info.engine originates in around 2008.there is some history in the club pages here of a similar problem way back in time,No problem with it until the last few months, took a 160 mile tour and all was good, next day in I get and some odd things happening with the "Temp" indicator, got to about 115 on the gauge, unusual, drops back to normal 90c, all is good.Out again, and now things are not good, temp way up towards the 140 mark on the dial, big smell of coolant around the car, luckily I was only a short distance from home, so back to the shed.Let it cool off, where has all the coolant gone? none to be seen in the thermostat housing / filler port, (this is Raceline water rail setup, yes got the small bleed hole in the thermostat, and it's fitted the right way), but lots sprayed about the engine bay.Check thermostat operation, ok, reassemble, tighten water pump drive belt a bit more, refill, drive, no difference, deglaze water pump pulley, Raceline setup, fit new belt, in case belt wasn't driving pump hard enough, no diferrence, piss water out all about the place.Ok long shot, remove water pump check impeller is fitted tight on shaft, yes, no movement there, even if warmed with a heat gun, so, change the radiator, yes , I had a spare from x flow days, pull it all together and no change.I have not changed the water pump, as at this stage, throwing another wodge of money into this money sucking black hole is not likely to fix it.And moving on, when I was at the early stages of this problem I carried out a compression test, No.1 225, No2 215, No.3 210, No.4 210, Hmmm not to much there, but when I removed the cylinder head No.1 cylinder had a noticeable line down the bore, and the top of the piston was covered in an oily film, not good. Today I did a check, with the head off, in the old fashioned way of the rings, bring 1 and 4 to nearly TDC pour some Kero, (paraffin on top, which one drains away first) No.1passed the fluid in an hour or so, indicates a broken ring. No. 4 was still nearly as I filled it at this time So now there are two problems; overheating and scored bore. So, if I pull the block out and it can be saved by a light hone with some new rings for the piston, there is still the overheating, water expulsion problem. I hate this engine.Time to reinstate the X flow, flick all the bling Raceline stuff get back to how a 1982 Seven should be, Weber 40 DCOE's the raw noise of gearbox and intake, I'm beginning to think this is how it should be.So, over to the learned brethern of the Sevenistas, any thoughts, inspiration, jokes, sensible ideas gratefully received.Cheers from the Far Side. Link to comment Share on other sites More sharing options...
Roger King Posted June 9, 2021 Share Posted June 9, 2021 Has the cooling system pressure cap failed? Link to comment Share on other sites More sharing options...
Nigel Riches Posted June 10, 2021 Author Share Posted June 10, 2021 Thanks Roger, I hadn't thought of that, as it is fairly new, but will get another when / if it goes back together. Link to comment Share on other sites More sharing options...
Area Representative Golf Juliet Tango Posted June 10, 2021 Area Representative Share Posted June 10, 2021 Hi NigelI'm sorry to hear of the issues and hope you can resolve them without binning the stuff you have had sent out to Christchurch.However, I love a Crossflow & won't be discarding it. Link to comment Share on other sites More sharing options...
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