Landcruiser 12HT Turbo Service Queries +
Submitted: Tuesday, Oct 23, 2007 at 17:29
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PeterInSA
My HJ61 Landcruiser with factory fitted Turbo has done 300,000Kms, we mainly use it to tow our Tandem Van and our half cabin boat. With the uncertainty re fuel supplies, the push towards electric and fuel costs in the medium to long term I wish to keep this vehicle for as long as I can. It has all the options and does whatever is asked of it.
I am seriously thinking of getting the Turbo serviced, what things/items should I look for to ensure that the job has been done correctly as any problems could arise when I am out in the bush 100s of K’s away from the nearest small town. There are no funny noises or whistles from the existing turbo. What would be a reasonable cost for this service/changeover turbo? The vehicle burns about 1/4 lt of oil under heavy load per 1000km.
If the Turbo is serviced/changed over would this put the rest of the engine under a lot more pressure eg Crankshaft which I understand is bigger than the non Turbo engined shaft? In other words should I leave the turbo alone?
I am a firm believer of “Not fixing it until its broke” because the fix can cause other problems. This vehicle has had the alternator replaced , Gearbox/Clutch/Transfer case rebuild and the seals on the passenger side CV joint done as
well as the usual brake pads, radiator clean etc. However having said “Nfiuib” what other items should I be considering, Fuel Pump? Starter motor brushes?
Appreciate your comments
Peter
Reply By: furph - Tuesday, Oct 23, 2007 at 18:27
Tuesday, Oct 23, 2007 at 18:27
I would not be too concerned about the turbo, purely rotational, no reciprocating parts.
The bottom end of the 2h/12ht are pretty much identical, however the 12ht has a stiffening plate at the bottom of the block to counter stresses.
The 12ht also has different pistons and larger diameter gudgeon pins, oil jet cooling to the piston underside.
What I would look at are the rocker arm tips where they press on the valve stems and the rocker shaft bushes. These are a wear item.
Also a compression test plus take the engine breather pipe off when hot, give a rev. and see what amount of fumes (piston ring blowby) is occurring.
Those motors were up amongst the best.
furph
AnswerID:
267995
Follow Up By: PeterInSA - Tuesday, Oct 23, 2007 at 20:23
Tuesday, Oct 23, 2007 at 20:23
furph, Thanks for your comments.
Re "see what amount of fumes (piston ring blowby) is occurring." How do I gauge what is too much?
Peter
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530463
Follow Up By: furph - Wednesday, Oct 24, 2007 at 10:38
Wednesday, Oct 24, 2007 at 10:38
Peter.
With the engine breather pipe off, engine hot, you would see a slight haze of blue steadily issuing out.
If on revving up there is a burst of heavy fumes you can tell the compression rings are on the way out or the bores are worn.
If the fumes "pulse" it usually means one or more individual cylinders are faulty. (the pulse coinciding with the firing stroke of that cylinder)
Another matter to check is oil pressure and condition of the oil pump. There is an engine cutout timer if oil pressure fails. If the pump is worn, the engine may cut out a few seconds after cold start, sometimes more than once. This indicates that the pump is not picking up oil pressure quickly enough and the timer is activated.
furph
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530570
Reply By: Oldsquizzy (Kununurra) - Tuesday, Oct 23, 2007 at 19:42
Tuesday, Oct 23, 2007 at 19:42
Have the same motor, Valve lash adjustment every 100000 klms Injectors every 200000 and Injector pump and turbo were done at 350000. I also have always done 5000 klm
services and at 430000 uses 500ml between
services. Have found if you look after these motors they rarely let you down.
Mine hasnt yet !
AnswerID:
268014
Follow Up By: PeterInSA - Tuesday, Oct 23, 2007 at 20:19
Tuesday, Oct 23, 2007 at 20:19
Oldsquizzy, I assume that by the Valve Lash adjustment you mean what Furph says "is where the rocker arm tips press onto the valve stems and Rocker shaft bushes?"
Why did you do the injector pump and turbo at 350000? lack of performance?and how did you gauge this? And approx Costs?
Appreciate your comments
Peter
FollowupID:
530462
Follow Up By: Oldsquizzy (Kununurra) - Tuesday, Oct 23, 2007 at 22:28
Tuesday, Oct 23, 2007 at 22:28
Injector pumps wear out like most things. At idle it had begun to hunt a slight amount Which usually is
the governor springs losing there tension and when they were doing it up found that the boost enrichment was fairly worn as
well.
Turbo was as far as I am concerned routine maintenance, If it aint broke costs a lot less to rebuild than if it is. Injector pump was a tad over 700 and the turbo was just under 600. Mind you that is trade and labour was zilch.
FollowupID:
530518
Reply By: Member - BIGMARK (QLD) - Tuesday, Oct 23, 2007 at 21:08
Tuesday, Oct 23, 2007 at 21:08
Peter my old HJ61 12HT had 437,000 (I had it since 165 k)on it when I very reluctantly had to let her go due to rust in sunroof and general wear of body parts.I never touched the turbo at all and the motor was still running like a dream.Just the usual 5000k service.
Cheers,
AnswerID:
268035