Outer Limits 4x4 Board

guys,

GQ SWB TB42 on gas and petrol......
99 percent of time its on LPG.

anything under 80kms and inc 80 and it sits about 1/4 up the gauge.

as soon as 100kms and 120kms it cooks up over about 15 mins and is nearly sitting on the line just under the top of the hot side of the guage

Ive put a new radiator cap, and flush and coolent in it.....
i also put colder plugs for the LPG in not sure if that makes a difference....

any thing i can do to fix this? i do a fair bit of highway driving in the GQ and its cooks at 100kms or over.....

dont think its thermostat, the only other thing is the fan clutch, but it appears to be fine also.......

ideas?

cheers

screwy

Get your radiator professionally cleaned. Mine used to creep up to 3/4 on big hills in low 1. Got the radiator reco’d, now it stays on a 1/4 no matter how hard I drive.

has it got a body lift & your radiator / fan don't line up???

no body lift. Only 2 inch coils.
it was doing it before that though......

all is standard in engine bay

common problem screwy...mine used to do same thing. straight lpg. had a new radiator core put in, new fan and hub assembly, new thermostat, washed out all the various coolers etc infront of radiator. tamed the running temps, sits at 1/4. however if i give it a bootfull up a serious climb, or thrash it hard for a while, the temps start to climb but never get above 3/4. have u read the service manual for the car? it states that normal running temps can vary from the cold mark to the hot mark, but over hot and it is a drama.

one a previous thread i have read that tb42's can also suffer from corroded cooling jackets in cylinders 5 and 6 and this has been the cause of many overheat probs and cracked heads. try doin a search for that earlier post...

thanks for the bit of info Viper guy....

not sure wat to do yet, im putting a/c on it next week and more than likely it will get worse so i have to fix it somehow

next step is thermostat, as its had a flush etc already

cheers

Thermostat ids a good bet, maybe only half opening.

Bazzle

viperguy wrote:common problem screwy...mine used to do same thing. straight lpg. had a new radiator core put in, new fan and hub assembly, new thermostat, washed out all the various coolers etc infront of radiator. tamed the running temps, sits at 1/4. however if i give it a bootfull up a serious climb, or thrash it hard for a while, the temps start to climb but never get above 3/4. have u read the service manual for the car? it states that normal running temps can vary from the cold mark to the hot mark, but over hot and it is a drama.

one a previous thread i have read that tb42's can also suffer from corroded cooling jackets in cylinders 5 and 6 and this has been the cause of many overheat probs and cracked heads. try doin a search for that earlier post...

I'll second this, are you losing water or blowing steam or black water out out the exhaust?
Mine did this, hopefully not motor swap time.

i have the same problem with my tb42 on gas

but temp doesnt necessarily climb above 80km

it climbs when the ac is on and im working it hard.

ive read heaps of similar threads re; tb overheating and i thought the most common reason was that the viscous coupled fan hub needed new juice, toyota part number 123, details somewhere on here.

i was going to replace mine this weekend, see if i can the bastard to suck like a goat

well, you get the idea.

check the fan and see if it has any movement in it, or spin it while the engines not running (of coarse) and see if it spins alot or a little.

.

pretty sure u cant oil the hub of the fan in the tb42's....u need to buy a new unit..well thats what i was told. did i get ripped?

viperguy wrote:pretty sure u cant oil the hub of the fan in the tb42's....u need to buy a new unit..well thats what i was told. did i get ripped?

Prety sure the TB42 has a sealed hub unlike the TD42. Wondering if it is possible to swap them over.
Another way I know you can do it. Is drill and tap a hole in the petrol one. This is what Sparky had done on his SWB petrol when he had that.

Rainbow Warrior wrote:

viperguy wrote:common problem screwy...mine used to do same thing. straight lpg. had a new radiator core put in, new fan and hub assembly, new thermostat, washed out all the various coolers etc infront of radiator. tamed the running temps, sits at 1/4. however if i give it a bootfull up a serious climb, or thrash it hard for a while, the temps start to climb but never get above 3/4. have u read the service manual for the car? it states that normal running temps can vary from the cold mark to the hot mark, but over hot and it is a drama.

one a previous thread i have read that tb42's can also suffer from corroded cooling jackets in cylinders 5 and 6 and this has been the cause of many overheat probs and cracked heads. try doin a search for that earlier post...

I'll second this, are you losing water or blowing steam or black water out out the exhaust?
Mine did this, hopefully not motor swap time.

uuum wen idleing when cold.......
IT does spirt a little black water, but only a couple of drops

IS THAT REALLY BAAAD???? WAT IS THAT????

Im not losing and water however that i can notice.
and im not blowing steam.

Ill do the thermostat on weekend.

screwy

Screwy has it got a thermostat in it . No thermostat can cause overheating also.

Kyle

i would of thought it does......

but ill pic one up and change it on weekend and see how i go.

cheers

screwy if u truck runs mostly on lpg, inspect ur thermostat carefully before replacing with a over the shelf one. when i swapped mine over it had a hole drilled in it that i didnt pay attention to..and when i drove my lpg converter was freezing over and the car wouldnt run. the hole was to allow water to flow even when the thermostat was shut. the convertor uses the heat from radiator water to change the lpg from a gas back to a liquid. i ended up drilling the same hole in the new one and it was all sorted. hope this helps anyone changing thermostats on lpg cars..dont know if its a straight lpg problem...but it might help

viperguy wrote:screwy if u truck runs mostly on lpg, inspect ur thermostat carefully before replacing with a over the shelf one. when i swapped mine over it had a hole drilled in it that i didnt pay attention to..and when i drove my lpg converter was freezing over and the car wouldnt run. the hole was to allow water to flow even when the thermostat was shut. the convertor uses the heat from radiator water to change the lpg from a gas back to a liquid. i ended up drilling the same hole in the new one and it was all sorted. hope this helps anyone changing thermostats on lpg cars..dont know if its a straight lpg problem...but it might help

thanks for the input mate.


ive got a funny feeling that my Clutch hub is stuffed....

it spins really freely when the motor is stopped....
and when cold i can stop it from spinning with my hand....
then when warm its still free and can still hold it still easily without it biting......

screwy

yeah thats what i thought was wrong with mine too.. but ended up changing it anyway..i dunno if it helped but because i dont everything at the same time.. hub, fan, new rad cor, new coolant, thermostat...

screwy if u looking for a new hub get one form don kyatt in seven hills..its a after market one but about the third the price of genuine..i bouht the fan from them too...cheep cheep..

Screwy_ScrewBall wrote:
ive got a funny feeling that my Clutch hub is stuffed....

it spins really freely when the motor is stopped....
and when cold i can stop it from spinning with my hand....
then when warm its still free and can still hold it still easily without it biting......

screwy

if you put your hand anywhere near that fan while it was running, you are a fool, like puttin fingers in a seperated leaf spring pack id say,

dont put your fingers where you wont put ya C0CK

Screwy_ScrewBall wrote:

Rainbow Warrior wrote:

viperguy wrote:common problem screwy...mine used to do same thing. straight lpg. had a new radiator core put in, new fan and hub assembly, new thermostat, washed out all the various coolers etc infront of radiator. tamed the running temps, sits at 1/4. however if i give it a bootfull up a serious climb, or thrash it hard for a while, the temps start to climb but never get above 3/4. have u read the service manual for the car? it states that normal running temps can vary from the cold mark to the hot mark, but over hot and it is a drama.

one a previous thread i have read that tb42's can also suffer from corroded cooling jackets in cylinders 5 and 6 and this has been the cause of many overheat probs and cracked heads. try doin a search for that earlier post...

I'll second this, are you losing water or blowing steam or black water out out the exhaust?
Mine did this, hopefully not motor swap time.

uuum wen idleing when cold.......
IT does spirt a little black water, but only a couple of drops

IS THAT REALLY BAAAD???? WAT IS THAT????

Im not losing and water however that i can notice.
and im not blowing steam.

Ill do the thermostat on weekend.

screwy

Yep careful with the thermostat, mine jammed, I put another genuine in and it did the same 2 weeks later. You should be able to see the temperature climb abit high then suddenly drop a few km's from home if it's working ok.

Black water out the pipe can also point to ignition problems or running too rich, mine was headgasket/cracked head, gradually got to the point I had to add water every time I drove it, then 3 months later the water & oil started mixing. Drove it for another 3 months, head was stuffed but the bottom end is in surprisingly good condition, could have just swapped heads & done an oil change, but I swapped motors to be sure.

thanks for the input man.

ill try thermostat and clutch hub.

screwy

ozy1 wrote:

Screwy_ScrewBall wrote:
ive got a funny feeling that my Clutch hub is stuffed....

it spins really freely when the motor is stopped....
and when cold i can stop it from spinning with my hand....
then when warm its still free and can still hold it still easily without it biting......

screwy

if you put your hand anywhere near that fan while it was running, you are a fool, like puttin fingers in a seperated leaf spring pack id say,

dont put your fingers where you wont put ya C0CK

I stop the fan with a farken screw driver idiot then i hold it still when cold.
try it when warm and its the same.
this means the clutch hub isnt biting solid when running warm.....
I.E stuffed