Mild 202 Overheating
#1 _macdou_
Posted 18 September 2018 - 10:12 AM
SU’s. YellaTerra Head.
Engine is in a cradle and is my test engine.
Engine was running ok temp wise and over a few days started to overheat for no reason
Have done the following so far
-New thermostat (tested)
-New water pump
-Heads been recoed
-New radiator
-New head gasket (gasket on correctly)
-made sure water passages weren’t blocked
-12 degrees timing
-No water in oil
-Oil pressure around 35psi
Currently temp basically climbs over 100 within 5 minutes from cold. So nothing has really changed from before I started this process.
Any other thoughts as I have run out of options.
#2
Posted 18 September 2018 - 10:41 AM
#3
Posted 18 September 2018 - 10:43 AM
Was head cracktested?
Any bubbles in radiator?
#4 _macdou_
Posted 18 September 2018 - 11:14 AM
No bubbles in radiator.
#5 _macdou_
Posted 18 September 2018 - 11:17 AM
I checked timing when Head was off with balancer and balancer has spun probably around 10 degrees so compensated when I retimed the engine.
Is the balancer good and timing 100% verified. Gauge, Temp sensor? Is it definitely getting that hot? After 5 mins is the system fully pressurized and fargin hot like it is about to boil?
#6
Posted 18 September 2018 - 11:52 AM
.
Attached Files
#7
Posted 18 September 2018 - 11:55 AM
Is the water pump circulating the coolant?
#8 _macdou_
Posted 18 September 2018 - 12:07 PM
Is the water pump circulating the coolant?
#9
Posted 18 September 2018 - 02:48 PM
Did it get hot before?
On a cradle with a fan fitted?
Any other cooling hoses fitted? ie manifold heating or water pump bypass hoses etc
Edited by LJ RB30, 18 September 2018 - 02:51 PM.
#10
Posted 18 September 2018 - 04:13 PM
#11
Posted 18 September 2018 - 05:18 PM
It's missing a carb.
Was thinking that too lol 😂
#12
Posted 18 September 2018 - 05:47 PM
Remove the thermostat and see if that makes a difference.
#13 _macdou_
Posted 18 September 2018 - 06:21 PM
Standard cooling setup with fan
So you have used the engine in a car before getting the head repaired?
Did it get hot before?
On a cradle with a fan fitted?
Any other cooling hoses fitted? ie manifold heating or water pump bypass hoses etc
Dave today I cut the guts out of my old thermostat and definitely made a difference. I had bought a new 82c thermostat which is probably too hot.
Remove the thermostat and see if that makes a difference.
#14 _macdou_
Posted 18 September 2018 - 06:24 PM
It's missing a carb.
Edited by macdou, 18 September 2018 - 06:31 PM.
#15
Posted 18 September 2018 - 06:41 PM
#16 _Agent 34_
Posted 28 September 2018 - 07:41 PM
Ok have a mild 202 running twin 2”
SU’s. YellaTerra Head.
Engine is in a cradle and is my test engine.
Engine was running ok temp wise and over a few days started to overheat for no reason
Have done the following so far
-New thermostat (tested)
-New water pump
-Heads been recoed
-New radiator
-New head gasket (gasket on correctly)
-made sure water passages weren’t blocked
-12 degrees timing
-No water in oil
-Oil pressure around 35psi
Currently temp basically climbs over 100 within 5 minutes from cold. So nothing has really changed from before I started this process.
Any other thoughts as I have run out of options.
had a similar situation with when i rebuilt the GTR, no issues off fresh engine quiet cold running then BAM it's up there 240 . there was no smell of heat nor was there any other signs. bit stumped.
after multiple thermostats up down up on the range i put the FLUKE meter into the water and there was NO way the water was getting to the shown temperature on the gauge.
sent the gauge off for testing and it was out , IF i put a 10 OHMS relay into the line then it would read ABOUT right,
end pf story.
Its a straight six, it's built with a factor of safety into the radiator heat exchange ( AKA radiator) with your set up it's impossible to have an over heating issue unless u dont run a fan and live in sydney.
it's your gauge. put a heat meter into the top of a radiator with the cap off, idol for some bazillion hours and see if it gets hot as per the meter reading
if it does not get hot as per the meter then your gauge is F@#$K or reading out.
(
Buy a 13 (or 15) psi radiator cap as well - but for that comp and ignition it should be a coooool running motor. dont get fooled by a " lean needle " either and fatten up the tune - it's not the needle
don't be fooled by some Tom Foolery fancy Gauges - your motor will smell like it's at 240 degrees and climbing and talk to you as such,
The oil on the side of the block will be smoking and wafting through the cab.
three cents grass hopper
,
Edited by Agent 34, 28 September 2018 - 07:42 PM.
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