Burning coolant and bit of oil : Head?

[thedjjack]

Diesels run with 2or3X the compression....aluminum heads and cast iron blocks....plus people tend to drive them like gas motors which they are not...

no guarantees on any motor..... warming them up slow, keep EGT resumable, and cool them down before shut down......

[Orionsbelt]

You're correct... and I'm guessing who ever had it before me ran it hard. The rad wasn't in great shape (required a couple full flushes) and the thermostat needed changing. I should have walked away then.

I never over heated this thing and if I did I was quick to back off the fuel. Use to be adamant about watching for black smoke out the back as well as watching the heat Gage on Scott Hill which is our big incline.

On the opposite side of the spectrum the Surf has a complete service history (new rad, timing belt,....) and driven respectfully. And after speaking to the JDM mechanic that maintains it there's no comparison between mitsu and toyota when it comes to diesels. He deals with both...

Anyhow it is what it is... Fingers crossed for the Surf.

O

[thedjjack]

I have no brand loyalty but Toyota has made some really bad diesels...aluminum heads on cast blocks have very different expansion rates...

Seeing temperature on the coolant gauge is too late...you need a Pyro (EGT)...

Warm motors up slow....was warm run them hard is fine...then cool them down....

[Mr. Flibble]

I have no brand loyalty but Toyota has made some really bad diesels...aluminum heads on cast blocks have very different expansion rates...

Seeing temperature on the coolant gauge is too late...you need a Pyro (EGT)...

Warm motors up slow....was warm run them hard is fine...then cool them down....

There are new low-compression diesels coming out that are incredibly efficient, and they have all aluminum blocks because of the lower compression ratio. I believe that the 2014 Mazda 6 is one of them.

[Artie Fufkin]

have owned the 2.5 for about 4 years.

Have replaced 3 head gaskets and a complete head. This engine seems very hard on head gaskets. PITA to be honest.

[.:FoRuM56:.]

I've had my 2.5 for 2 1/2 years. No head gaskets/heads yet. 310,000kms..

And I run much boost/fuel lol.
I think it has to do with owner operation.

[Orionsbelt]

Knock on wood the Surf 3.0 is running pretty nice. Slowing doing some cleaning/flushing.

Been doing LOT'S of reading on these Surfs and have learned a few issues that apply to all imports.
The biggest is not knowing how they've been treated by the time they get here particularly the cooling systems. I treated my Paj pretty good but I suspect it was very used and abused before I got my hands on it. Making it a ticking bomb.

Overheating on both the Surf 2.4 and 3.0 (less so) have generally been from the following:
EGR system cokes up the intake manifold (something I'd like to clean on mine) - would be an issue with any import. This is a big one that gets overlooked.
As a corollary to the above do a couple oil flushes to help with the carbon that WILL get into the engine via that EGR.
Cooling system not maintained. My paj took a ton of flushing with 2 chems and we never did get it really clean. It's almost worth it just to replace the rad the second you purchase one of these things - My new surf's rad was replaced by the previous owner a yr or so ago.
Surf's have a poor design when it comes to the trans cooler / rad integration. Requires an external trans cooler add on but that's for guys towing in Ausie heat.

Artie...I don't know why you're going through so many gaskets and then a head...that's very odd. That was either the install wasn't done right or faulty product.

Slight rant...
I don't know what the Japs do to these things?! Diesels are 'supposed' to be tough. I had my '97 Cherokee Sport for 9 yrs (bought it 5 yrs old with 66k) I had 260+k on it when I wrongly traded it for the paj. It was bullet proof. I looked after it but certainly didn't baby it when it came to flushes etc. I'm hoping the Surf 1kzte engine gives me same life.

O

[psilosin]

HUGE thing most people ignore on the Hilux Surf is making sure the silicone in the fan clutch has not dried up (most have after 15+ years). If it has then your main fan pretty much is doing nothing. Never had an issue with my Hilux Surfs (since 2004). Also when you refill the silicone oil you can, instead of replacing with the Toyota oil which is expensive, you can buy 'shock oil' from a hobby store. Same stuff but is also available in many different weights. Stock Toyota is ~2000wt. I use 10,000wt. Higher weight is 'thicker' and lets it bite stronger.

[Rattlenbang]

Slight rant...
I don't know what the Japs do to these things?! Diesels are 'supposed' to be tough. I had my '97 Cherokee Sport for 9 yrs (bought it 5 yrs old with 66k) I had 260+k on it when I wrongly traded it for the paj. It was bullet proof. I looked after it but certainly didn't baby it when it came to flushes etc. I'm hoping the Surf 1kzte engine gives me same life.

O

I guess "Jap" is better than "Nip", but still...

Anyway, I suspect the biggest issue with these rigs is not how hard they are driven but how much they sit and are used only for short drives where they don't get up to temp. The low miles is crazy given the age of these cars, kinda like a motorhome. Its a lot harder on an engine sitting and always run cold than lots of miles.

[jrrodger]

I would say that the 4D56 has been serving me well. Mind you I am only at 185000. With a blown turbo as the only major breakdown since 60000 kms.

I rev my engine quite frequently at the 3500 RPM as I drive it on the highways and have the pedal to the floor.

I would say that running high quality oil makes things run much better. The 4D56 definately does not run very smoothly with the lower quality oils particularly while the car is warming up for the fist few KMS in the mornings.. Also the really crappy quality oil tends to gum up in the system as sludge.

Also I recommend a yearly Flush of all the cooling system which keeps the cylinder head from deforming shape and over-heating and also the Heater system keeps the passengers much more Toasty in the winter. Coolant and distilled water are very cheap to buy and change compared to gaskets and new cylinder heads.

JR

[Orionsbelt]

@ Rattlenbang - I meant no disrespect to Japanese people...purely using a short form and I'm not the most PC person in the world.

You get more carbon build up doing the short hops as mentioned which takes us back to the Intake Manifold getting coked up. Kills mileage as well. So again worth the cleaning.

psilosin - Yes I read that about the fan clutch. Not sure on mine but the fan seems to be cranking pretty good at this pt.

O