4evaevo Posted October 8, 2010 Share Posted October 8, 2010 Just finished my escort today, took it for abot a 10km drive came home and it boiled. i then let it cool down and started it about 2hours later, it seamed to run ok. Then i took the thermostat out and put a bigger radiator in it started it up now it runs realy ruff. any idea what is wrong? Quote Link to comment Share on other sites More sharing options...
Requiemk Posted October 8, 2010 Share Posted October 8, 2010 blew head gasket, do a cooling system pressure test hahaaaha Quote Link to comment Share on other sites More sharing options...
4evaevo Posted October 8, 2010 Author Share Posted October 8, 2010 hopfully its just a head gasket. Quote Link to comment Share on other sites More sharing options...
Unclejake Posted October 8, 2010 Share Posted October 8, 2010 Describe what was done in the re-condition Quote Link to comment Share on other sites More sharing options...
4evaevo Posted October 8, 2010 Author Share Posted October 8, 2010 Just hardens valve seats, 1300 pistons and cosworth a2 cam. And new bearing ect Quote Link to comment Share on other sites More sharing options...
Unclejake Posted October 8, 2010 Share Posted October 8, 2010 This is a tough one. The running rough may or may not be a result of the overheating, but the overheating and running rough may be a result of a vacuum leak. The other, less palatable option, is that you allowed insufficient clearance between the new piston crowns and the head. When the conrods warmed up they streched slightly and smacked the head, lifting it slightly and causing combustion gasses to enter the coolant - thus overheating the engine very quickly. I recall the 1600 motors as having the combustion chamber in the piston bowl. The 1300 pistons are similar with just a bit less bowl?? Quote Link to comment Share on other sites More sharing options...
4evaevo Posted October 8, 2010 Author Share Posted October 8, 2010 Before I cooked it I had it running for short periods of time and it ran sweet. Yes the 1300 pistons have a smaller bowl, I put them in to put that compression up. Quote Link to comment Share on other sites More sharing options...
Unclejake Posted October 8, 2010 Share Posted October 8, 2010 As an aside, no thermostat is fine for diagnostics, but it isn't a good way to roll. The coolant will move faster through the block than is optimal and will not get time to rid the engine of heat. With luck your problem is simple. These are easy engines to work on so be logical and you will find the issue(s). A BHG is possible given that the motor got too hot and that is why it is running roughly now. Check the oil for signs of coolant. Never thrash a new engine. Shit goes bad. Quote Link to comment Share on other sites More sharing options...
4evaevo Posted October 8, 2010 Author Share Posted October 8, 2010 I wasn't Evan thrashn it and it got hot. I have a bigger radiator and fan in it now so hopfully that fixs the over heating problem. It was weird how it was running fine after it over heater then it started missing and running ruff. Do you no what temp they should be running at? Hopfully it's just a bhg Quote Link to comment Share on other sites More sharing options...
Unclejake Posted October 8, 2010 Share Posted October 8, 2010 About 90 degrees C is ideal Quote Link to comment Share on other sites More sharing options...
4evaevo Posted October 8, 2010 Author Share Posted October 8, 2010 It's benn at about 100. I might do a compression test tomoro it should test me if it's a bhg. Quote Link to comment Share on other sites More sharing options...
4evaevo Posted October 9, 2010 Author Share Posted October 9, 2010 I did a compression test and the results were: piston one 150psi, two 150, three 135, four 150 pistion 3 seam rather low, So i started it up and took no 3 spark plug lead off and it made no difference to the running. Then i took the head off, the head gastket was fine, the bore was in good condition too. when i was turning the engine over by hand (with the head off) it had a slight hard patch is that normal? Quote Link to comment Share on other sites More sharing options...
fuel Posted October 9, 2010 Share Posted October 9, 2010 where was this slight hard patch in relation to where #1 piston tdc? with no head it should be smooth with its rotation. Who built up the engine? was the piston to cylinder wall clearance measured for each piston? Quote Link to comment Share on other sites More sharing options...
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