jacko
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 posted on 9/6/10 at 06:03 PM |
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skyline engine overheating
Hi all you knowledgeable people I am asking this question for my son. My son has just re built his skyline engine and now it is back in the car he can
only drive it about 4 - 5 miles before the engine management light comes on and at the same time the water temp gauge goes up to boiling mark. The car
then goes into limp mode He's tried running the car without a thermostat and the light doesn't come on but the engine doesn't get
warm or hot so he has checked the thermostat but has fitted a new one. After fitting the new one the light still comes on after a few miles. Has any
one got any idea as to what could be causing this? This has never happened before he re shelled and re ringed the car. Jacko
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Liam
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| posted on 9/6/10 at 06:12 PM |
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When rebuilding the engine, did he remember to fit the water pump? More seriously was there any way the pump or belt/gears that drives it could
have been fitted incorrectly? If all seems good mechanically, have you investigated whether the overheat is real (i.e. measured high water temp via
some other method) or perhaps it's just a faulty coolat temp sensor? What about an airlock when filling the system?
Some things to think about anyway - sorry I dont have any specific Skyline knowledge (wish I did though )
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jacko
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| posted on 9/6/10 at 06:19 PM |
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He is checking the water pump at the moment as far as he knows there is no air in the system
it seems funny that it was ok before the rebuild
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stevebubs
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| posted on 9/6/10 at 06:32 PM |
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Did he torque the head gasket correctly?
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RichardK
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| posted on 9/6/10 at 06:34 PM |
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Could the head gasket go on the wrong way and in doing so block the waterways!
Prob hasn't and I can't think of any easy way to check!
Cheers
Rich
Gallery updated 11/01/2011
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jacko
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| posted on 9/6/10 at 06:37 PM |
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quote:
Originally posted by stevebubs
Did he torque the head gasket correctly?
Yes He has rebuilt skyline engines many times and never had this before
I think i will have to go to his house and check it with him
Do you think he could have got a wire the wrong way round on some thing
Jacko
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Peteff
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| posted on 9/6/10 at 06:41 PM |
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Can you get the thermostat the wrong way round ?
yours, Pete
I went into the RSPCA office the other day. It was so small you could hardly swing a cat in there.
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Mark G
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| posted on 9/6/10 at 06:56 PM |
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Running lean? Has he had the fault memory checked to see what the fault is? Could be air/fuel related.
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plantman
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| posted on 9/6/10 at 07:02 PM |
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Air
I didn't have any in mine either....... until I let it out
sr20det engine same thing run for 4-5 mins at tickover before it got really hot Obvious really no water going around the engine or rad
Oh and i checked it for air loads of times
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Liam
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| posted on 9/6/10 at 07:20 PM |
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Just ead the original post properly and noted it doesn't overheat with no thermostat fitted, suggesting the thermostat is the cause. I suppose
it is possible you might have two duff thermostats! Have you verified they are OK by bringing them to a boil in a saucepan and observing them
moving?
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jacko
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| posted on 9/6/10 at 07:21 PM |
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quote:
Originally posted by Liam
Just ead the original post properly and noted it doesn't overheat with no thermostat fitted, suggesting the thermostat is the cause. I suppose
it is possible you might have two duff thermostats! Have you verified they are OK by bringing them to a boil in a saucepan and observing them
moving?
Yes checked them both in a mug with boiling water both ok
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MkIndy7
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| posted on 9/6/10 at 07:58 PM |
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Or poor water flow, hence with the thermostat (a major restriction) removed it doesn't show the same symptoms but might still struggle when
pressed hard.
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madteg
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| posted on 9/6/10 at 08:07 PM |
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AIR LOCK are the hoses standard or changed that might be airlocking.
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sonic
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| posted on 9/6/10 at 08:36 PM |
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Hi Graham
I would go with the Airlock idea.
I had a Pug 106 the other day which i changed the Rad on,afterwards the ECU kept putting the temp light on and the fan kicked in all the time,it took
me a hour of bleeding from every hose to cure it and bingo sorted.
Really weird as i have done loads of these and never had the problem at all on any car.
Good luck
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T66
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| posted on 9/6/10 at 10:38 PM |
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Is the temprature sender working ?
Is the coolant boiling over or not ?
For me if the problem is eased with removal of the thermostat, then the engine has more coolant to play with delaying the boil over issue.
If it worsens with it fitted then the engine has a severe circulation problem.
water pump the obvious one
belts/pulleys
coolant ways blocked, however the odd bit of old gasket isnt going to be a showstopper.
Ive always managed to clear air locks with liberal hand pumping of the hoses with the engine running. Do the hoses feel like they are full ?
If not suspect air lock.
make sure you tell us your solution & good luck , dont cook it !
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jacko
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| posted on 12/6/10 at 08:21 PM |
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Hi all for those that asked
The bran new head gasket was f***ed
water in the oil and the pressure was doing the rest 
at least we know what it is now
Jacko and Son 
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