Outer Limits 4x4 Board

after a new head and a cooling system flush my tb42 seems to get almost 2 thirds of the way up the guage when its revving fairly hard, like a long greasy hill or even when your pushing fairly hard. is this normal? it is on lpg and turning 35s if that would influnce this to.

Mine sits at about 1/3 most of the time. I've seen it get to 1/2 way up the gauge once, and that was boot to the floor on a long climb in 36+ deg temps.. The fan normally locks up somewhere between 1/3 and 1/2 and drags it back down to 1/3 pretty quickly.

Having said all of that, lots of people recommend not trusting the Nissan gauge..

I'm not sure why people worry. The engine is made to run anywhere up to the red zone.....

my old tb42 would run up past 3/4 on steep muddy hills on 34's, but would come back reasonably quickly when at the top, or stopped. My issue was that the head behind the water pump was slightly corroded and meant that the water pump couldn't get to full pressure. Still ran perfectly for years and still is running perfectly on 35's regularly.

It is also on gas.

when you got your head changed did you

A: bleed the system properly? ( dont expect every mechanic to know how to bleed it properly)

B: flush the radiator by removing the end tank and cleaning it properly

C change the fan clutch with a new one

D fit a new themostat.

?

JEs

mine will only get to half no matter how hard you push it.

Have heard they are tricky to bleed all the air out of the system.

i got paranoid last summer and fitted an aftermarket water temp guage, mine will happily sit on about 82-84dec C during normal running, pushing it hard whilst wheeling it can climb upto 90-95 but it comes down quickly when just idling...in summer when its 35+ it gets a bit hotter but always cools down quickly.

jessie928 wrote:when you got your head changed did you

A: bleed the system properly? ( dont expect every mechanic to know how to bleed it properly)

B: flush the radiator by removing the end tank and cleaning it properly

C change the fan clutch with a new one

D fit a new themostat.

?

JEs

have done everything except for the fan clutch.
the reason it cracked a head in the first place was the radiator was 70% blocked, i had only owned the car for about 2 months before it let go at dargo. radiator was professionaly flushed

i would consider a 3core radiator,
i replaced my standard one with one never got hot again this was on my old 88tb42

also yours is deul feul yes?? would recomend 4x4 wheeling on petty only
as lpg burns hotter works motor harder, more prone to cracking head on lpg working hard, for this reason i never put my GQ on lpg

matthewK wrote:i would consider a 3core radiator,
i replaced my standard one with one never got hot again this was on my old 88tb42

also yours is deul feul yes?? would recomend 4x4 wheeling on petty only
as lpg burns hotter works motor harder, more prone to cracking head on lpg working hard, for this reason i never put my GQ on lpg

dont you think petrol patrols crack heads? ( they do)
but yes, LPG does burn hotter but its not an excuse to pay 120 a litre instead of 45cents.

JEs

matthewK wrote:i would consider a 3core radiator,
i replaced my standard one with one never got hot again this was on my old 88tb42

also yours is deul feul yes?? would recomend 4x4 wheeling on petty only
as lpg burns hotter works motor harder, more prone to cracking head on lpg working hard, for this reason i never put my GQ on lpg

I never had an issue running almost always on LPG, on and offroad (and not taking it easy)

Well Waady,for what its worth,the gauge on my td42 always sits a tad under half way all the time,no regardless what I do.

my tb42e turbo never gets past halfway even after a good thrashing, i have a 4.8L radiator on it and each cylinder is individually water cooled (to stop blockages etc.)

td lux wrote:my tb42e turbo never gets past halfway even after a good thrashing, i have a 4.8L radiator on it and each cylinder is individually water cooled (to stop blockages etc.)

did you drill above the exhaust port on each cyl?

it should run at 81 or 82 degrees from memory according to the service manual.

You could replace the whole cooling system componentry. You could run on Petrol as it burns cooler. You could spend loads of money doing upgrades and mods and buying new parts.

If you don't have heaps of money to burn, I highly recommend maintaining the cooling system in it's current (standard) form. That means flushing it at least every 12 months. Get a new thermostat and radiator cap - if there is any question about their reliability or operation (it's an inexpensive insurance)

If you do have LPG/dual fuel, and you are concerned about the temps when using LPG make sure that it's tuned correctly. The engine shouldn't run too much hotter if it is tuned correctly. On dual set-ups there is a compromise between the running on petrol and LPG. If the LPG is tuned correctly the petrol running suffers. But let's face it most people use the LPG most of the time so make sure it is tuned to suit the LPG.

I wouldn't be too concerned about the temp gauge until it get very close to the red line. Saying that, mine only gets to just above half.

Good luck - and happy spending

jessie928 wrote:

td lux wrote:my tb42e turbo never gets past halfway even after a good thrashing, i have a 4.8L radiator on it and each cylinder is individually water cooled (to stop blockages etc.)

did you drill above the exhaust port on each cyl?

is this the all heads kit? another 6 small coolant lines and re plumb it into the top radiator pipe? im very intersted in this mod

waandy wrote:

jessie928 wrote:

td lux wrote:my tb42e turbo never gets past halfway even after a good thrashing, i have a 4.8L radiator on it and each cylinder is individually water cooled (to stop blockages etc.)

did you drill above the exhaust port on each cyl?

is this the all heads kit? another 6 small coolant lines and re plumb it into the top radiator pipe? im very intersted in this mod

yeah i dont know who else does it, but its a very good MOD, it basically gets the water quickly out of the hottest / steamiest part of the head.

JEs

chpd80 wrote:mine will only get to half no matter how hard you push it.

Have heard they are tricky to bleed all the air out of the system.

I agree, there are no normal conditions where a TB42 should have erratic temps. It should climb to operating temp quickly and then sit there like a rock imho. The stock cooling system is well up to the task of cooling the engine even when it's working hard. You shouldn't need any modifications.

Heads being weak on them or needing extra cooling is a crock, people just don't maintain their cooling system properly. Just my opinion.

jessie928 wrote:

waandy wrote:

jessie928 wrote:

td lux wrote:my tb42e turbo never gets past halfway even after a good thrashing, i have a 4.8L radiator on it and each cylinder is individually water cooled (to stop blockages etc.)

did you drill above the exhaust port on each cyl?

is this the all heads kit? another 6 small coolant lines and re plumb it into the top radiator pipe? im very intersted in this mod

yeah i dont know who else does it, but its a very good MOD, it basically gets the water quickly out of the hottest / steamiest part of the head.

JEs

what is it worth? im very keen on the idea of it, wouldnt mind getting that, electronic egnition and a nice new set of claws before i put all my pennies towards my house, and just plod along with the barwork

i dont know how much you woudl get it done for but it basically invlves drilling 6 holes, taping them with a thread putting 6x 2 incgh ( roughly) long threaded pipes into the head and connecting all 6 into a manifold of sorts and dumping the lot back into the top radiator hose.

if you are neglect the state of tune in your lpg 4wd ( like most people ) its worth it.

electronic ignition is DEFINATLY worth it.
along with the electronic ignition, get your dizzy regraphed for a LPG advance curve.

if your really keen, rip your head off and shave the sucker RIGHT down till there is only a single shave left in it.
this will do wonders to both your LPG performance /economy and the temp of the engine.

Jes

marin wrote:

matthewK wrote:i would consider a 3core radiator,
i replaced my standard one with one never got hot again this was on my old 88tb42

also yours is deul feul yes?? would recomend 4x4 wheeling on petty only
as lpg burns hotter works motor harder, more prone to cracking head on lpg working hard, for this reason i never put my GQ on lpg

I never had an issue running almost always on LPG, on and offroad (and not taking it easy)

i do know you can crack ya head on petty too
but gas was just somthing i herd on the vine and id never gased the GQ

even now with my V8i discovery i never run gas in th bush just petty
mostly use gas for freway use and around dandy

ON TRACK built my engine so the individual cooling was doen before i owned truck, although it seems pretty basic, i will post pics ASAP!! I believe that it is a great mod my truck never ever runs even near hot running high boost through the TB42e.

** I am sure ON TRACK would do this mod **

td lux wrote:ON TRACK built my engine so the individual cooling was doen before i owned truck, although it seems pretty basic, i will post pics ASAP!! I believe that it is a great mod my truck never ever runs even near hot running high boost through the TB42e.

** I am sure ON TRACK would do this mod **

i dont think that this mod woudl really reflect on the temp guage that much, what it does do under the radar though is a very worthwhile in the long run..
Jes

blockages are not so much and issue anymore.

jessie928 wrote:i dont know how much you woudl get it done for but it basically invlves drilling 6 holes, taping them with a thread putting 6x 2 incgh ( roughly) long threaded pipes into the head and connecting all 6 into a manifold of sorts and dumping the lot back into the top radiator hose.

if you are neglect the state of tune in your lpg 4wd ( like most people ) its worth it.

electronic ignition is DEFINATLY worth it.
along with the electronic ignition, get your dizzy regraphed for a LPG advance curve.

if your really keen, rip your head off and shave the sucker RIGHT down till there is only a single shave left in it.
this will do wonders to both your LPG performance /economy and the temp of the engine.

Jes

how does shaving the head make it run ccoler and de-crease lpg consumption? if i shave it can i still run petrol on the weekend trips?

My tb42, runs at a little under a quater 99% of the time, occasionally gets to about half after flogging it up long hills running lpg and 35's, but viscous fan locks up and temp falls quickly. HD 4 core radiator, bleed off ports in head, good quality coolant, good clean cool sorce for air intake and good hoses make the difference. Also if u have a/c made sure the condensor does not have blocked fins restricting airflow to radiator.

waandy wrote:

jessie928 wrote:i dont know how much you woudl get it done for but it basically invlves drilling 6 holes, taping them with a thread putting 6x 2 incgh ( roughly) long threaded pipes into the head and connecting all 6 into a manifold of sorts and dumping the lot back into the top radiator hose.

if you are neglect the state of tune in your lpg 4wd ( like most people ) its worth it.

electronic ignition is DEFINATLY worth it.
along with the electronic ignition, get your dizzy regraphed for a LPG advance curve.

if your really keen, rip your head off and shave the sucker RIGHT down till there is only a single shave left in it.
this will do wonders to both your LPG performance /economy and the temp of the engine.

Jes

how does shaving the head make it run ccoler and de-crease lpg consumption? if i shave it can i still run petrol on the weekend trips?

lpg is high octane, it likes more compression and is MUCH more efficient with a higher compression ratio.

depending how much you shave, you can just run higher octane fuel on the weekends so you dont have pinging ( thats what i do)
Jes

jessie928 wrote:

waandy wrote:

jessie928 wrote:i dont know how much you woudl get it done for but it basically invlves drilling 6 holes, taping them with a thread putting 6x 2 incgh ( roughly) long threaded pipes into the head and connecting all 6 into a manifold of sorts and dumping the lot back into the top radiator hose.

if you are neglect the state of tune in your lpg 4wd ( like most people ) its worth it.

electronic ignition is DEFINATLY worth it.
along with the electronic ignition, get your dizzy regraphed for a LPG advance curve.

if your really keen, rip your head off and shave the sucker RIGHT down till there is only a single shave left in it.
this will do wonders to both your LPG performance /economy and the temp of the engine.

Jes

how does shaving the head make it run ccoler and de-crease lpg consumption? if i shave it can i still run petrol on the weekend trips?

lpg is high octane, it likes more compression and is MUCH more efficient with a higher compression ratio.

depending how much you shave, you can just run higher octane fuel on the weekends so you dont have pinging ( thats what i do)
Jes

does it run hotter? i thought more compression would make temp rise?

td lux wrote:ON TRACK built my engine so the individual cooling was doen before i owned truck, although it seems pretty basic, i will post pics ASAP!! I believe that it is a great mod my truck never ever runs even near hot running high boost through the TB42e.

** I am sure ON TRACK would do this mod **

did you end up getting any pics mate?

Ref motors running hot ect ect? I had been using moreys oil supplement, I would add it when the motor had an oil & filter change. the temp gauge would drop 10 degrees. That was used in a hot 351 & driven hard whenever I had the chance.