Is the 3.0 Diesel prone to BHG like the 2.4

[Roadside Tech]

As per title really, thinking of a local 4runner that is for sale as my vehicle for my new business.

Are they prone to BHG like the 2.4D that your hear about??

I'm talking day to day with no other failures making it happen like a knackered radiator, water loss, as obviously then any HG can go.

TIA

[biosurf]

Although it seems that its more common with the 2.4s this problem is seen more and more with 3.0L too.
My 3l 1993 Surf had had its head go and been replaced when I bought it and my neighbours has just gone in his '93 3l.

[MattF]

Like Biosurf mentioned, it does seem to be appearing with some of the 3.0L's of late. Keeping on top of the coolant system and making sure it is in tip top order should keep everything running fine, however. A lot of the head problems seem to have some prior coolant system fault leading upto them in most cases.

[TonyN]

Its definatly not a 'weakness' like the 2.4's, I have got our 3.0 just shy of the red zone on numerous occasions towing big trailers in the last 4 years. That would have been certain death for a 2.4 head, and even a uprated one. The 2.4's where almost guaranteed to crack if the sun came out.

Heads crack, its happens, its a high stress component, regardless of the car. I am currently repairing our Pug 106, we brought awhile ago, 80,000 miles....head gone.

Don't let it get hot, and you should be OK. but you don't know what has happened before you got it, and radweld sometimes holds for 6-12 months, especially if you don't do long runs in the truck and it has an easy life, some of the cracks are so small they don't even open and leak untill you go on really long run.

Don't forget 3.0's probably out number 2.4's by lots now, I know lots of 2.4's that are just scrapped when they break, as a 3.0 is so much nicer to drive and so cheap these days lots of people here have upgraded.

[biosurf]

Hijacking the thread a bit but on the same topic

I'm sure this is a stupid suggestion and will show up my complete numptyness about how motors work
but
As many fit intercoolers to their engines to keep them from overheating is there any reason why you couldn't re-route the air-con system so it vents the cooled air into the engine bay or near the rad or in the air intake etc. to keep it all at a lower temperature?

guessing it may be a crap idea along the lines of 'air con increasing the load on the engine and negating any positive effects' or summat like that?

[RodLeach]

Hijacking the thread a bit but on the same topic

I'm sure this is a stupid suggestion and will show up my complete numptyness about how motors work
but
As many fit intercoolers to their engines to keep them from overheating is there any reason why you couldn't re-route the air-con system so it vents the cooled air into the engine bay or near the rad or in the air intake etc. to keep it all at a lower temperature?

guessing it may be a crap idea along the lines of 'air con increasing the load on the engine and negating any positive effects' or summat like that?

An intercooler is a performance modification.

Its purly to make it go a bit quicker. Has no cooling benefits other then air intake.

To be honest, with routing the A/C into the engine bay. Your dealing with a sh!t load of heat. The A/C would only just scratch the surface with regards to temperature.

With the air coming into the engine bay from the grille up front the best way to enhance cooling is to give the hot air somewhere to go.

With backwards facing scoops on a bonnet etc you would force cold air in which hopfully will take some hot air with it.