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253 runs hot and pre ignition? help!!
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253 runs hot and pre ignition? help!!timing is perfect engine runs really hot (1/2 on temp gauge),could this cause pre ignition?i will still flush the block ,but any advice on what else could cause it ?
Jim in adelaide |
Jim in Adelaide.. |
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Carbon build up in the head chamber can also do this, the carbon retains some heat and continues to ignite the fuel.
Also the rubber on the harmonic balancer can separate causing the timing mark to be in the wrong place, did you use a timing light or d |
You only have to be in front at the end of the race. |
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Hi JBM,i did the timing static by moving the crank by hand and checked the dizzy ,all good ,the heat is extreme the worst ive ever seen ,like 20 minutes later still red hot to touch (engine and radiator)but runs 1/2 on the temp gauge?that sort of heat in Edited by user Sunday, 22 March 2009 11:28:02 PM(UTC)
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Jim in Adelaide.. |
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If youre sure its an overheating problem check your thermostat and water pump.
Others here have had more than a few dodgy thermostats.
Look in your rad to see if the waters moving past the filler.
How did you check the static timing? Thumb in spark plu |
You only have to be in front at the end of the race. |
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Also,check/replace your fuel filter,if it is restricting flow,it will run hot and ping, had that happen before
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Hi all ,no thermostat dont ever run them(austrailia why would you?)new water pump as it was broken badly when i got the car ,worst ive seen bearing had 1/4 inch movement when the engine was running big growl,fuel filter is no problem ,no pinging at all bu |
Jim in Adelaide.. |
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No pinging at all?
So the engine is running on after you turn it off?
Usual cause is idle speed too high.
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Will try to slow it down but im almost sure its the heat,thanxz...jim
Jim in adelaide |
Jim in Adelaide.. |
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Best way to check if balancer has slipped is to make up a tool that screws into the sparl plug hole with an extension that will touch the piston before TDC.
I made one out of an old sparl plug. Break all the porcelion out and just use the shell. I built
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yeah im gonna look at the radiator cause it looks roughish so i wont be wasting money fixing that up,but i will get the block flushed first,.i still wont run a thermostat,i think they are a blockage waiting to happen and it will at the most inconveniant t Edited by user Wednesday, 25 March 2009 10:33:46 AM(UTC)
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Jim in Adelaide.. |
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Before you spend too much time on this, find out what is the true running temperature of the engine.
All you have said so far is, "it seems hot & the gauge reads half". 80 to 85 degrees at the thermostat housing is considered normal.
Running on is c |
If at first you don't succeed, just call it Version 1.0 |
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Jim did you get your problem fixed....
my 253 has the same symptoms in relation to heat but with no pre ignition...
i wonder if you have 2 seperate issues or if they are interrelated
cheers
Al
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have touched it yet but give me a day or two and ill post it up..
Jim in adelaide |
Jim in Adelaide.. |
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Mate listen to the bloke that told you to run a thermostat. they are in there for a purpose. what they do is give the water a chance to be cooled by the radiator, if there is no restriction the water can flow around and around so fast it wont be cooled pr
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Mate im not a fool and wont be refitting a thermostat.This alone WILL NOT cause the run on Im talking about or the heat.Im not new to the car game and I understand people have their own opinions,and rightfully so but after building quite a few cars its sa Edited by user Saturday, 11 April 2009 7:18:52 PM(UTC)
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Jim in Adelaide.. |
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so far ive changed this!...4 blade fan,no shroud,2 core radiator....changed to 8 blade fan ,shroud and 3 core radiator,temp is running 1/2 on the gauge but the engine is no where near as hot..hope this helps...hqgts Jim in adelaide Edited by user Tuesday, 14 April 2009 5:12:04 AM(UTC)
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Jim in Adelaide.. |
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253 runs hot and pre ignition? help!!
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