HJ60 sludge

Submitted: Saturday, Aug 23, 2008 at 22:01
ThreadID: 61020 Views:3162 Replies:4 FollowUps:4
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A mate brought around a HJ60 400,000K diesel for a workup (it was a hand-me-down and had been neglected a bit). We are having the injector pump and injectors done, but when replacing the rocker gasket noticed huge amounts of sludge up top. Now I know this is normal for diesels and no bit concern but this was really thick and LOTS of it.

In fact the oil pressure gauge is very high when running indicating that this sludge might very well be obstructing (to one degree or another) the normal flow of oil around the engine.

Does anyone have any advice for getting this thick sludge out in a timely manner? Obviously engine flush additives can be used, but I was told once that a little kero can be used provided it is done very carefully.

Has anyone done this????? and if so how? or is the use of kero just plain crazy?
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Reply By: PATROL_ST_2004 - Saturday, Aug 23, 2008 at 22:50

Saturday, Aug 23, 2008 at 22:50
Hi Husky

I previously had a HJ60 non-turbo and had same problem at around 280,000km, I put 1 ltr diesel into oil and ran for 30 mins at 60 kmph around town, then flushed out and filled with cheap oil and new filter again ran for 30 mins before flushing, then filling with castrol RX diesel oil and new filter. It was amazing how much sludge came out and motor seemed to run smoother. At 320,000 I fitted turbo kit running 10psi and had no problems at all even when vehicle was replaced by new one at 498,000km,

Cheers Rob
AnswerID: 321899

Follow Up By: husky01 - Saturday, Aug 23, 2008 at 22:54

Saturday, Aug 23, 2008 at 22:54
sounds like that might be the ticket rob. apart from a little TLC needed on the engine this 60 series is in excellent condition and probably worth some work

i've never driven one (I have an 80) but i understand they're very capable 4wds
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Reply By: PATROL_ST_2004 - Saturday, Aug 23, 2008 at 23:08

Saturday, Aug 23, 2008 at 23:08
Husky

Kero will dry out motor seals/gaskets, where as diesel is oil based and will not. My 60 was reasonably modified over 12 mths and as I was in a 4wd club I liked to compete in club events, alot of fun, good luck.

Cheers Rob
AnswerID: 321903

Follow Up By: husky01 - Saturday, Aug 23, 2008 at 23:11

Saturday, Aug 23, 2008 at 23:11
Thanks again for your advice Rob, appreciated
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Follow Up By: Malleerv - Sunday, Aug 24, 2008 at 07:28

Sunday, Aug 24, 2008 at 07:28
What is Kero made from???
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Reply By: Member - Ian H (NSW) - Sunday, Aug 24, 2008 at 08:46

Sunday, Aug 24, 2008 at 08:46
I would use CEM engine flush. Great product, well tried and proven.
AnswerID: 321931

Reply By: Member - Footloose - Sunday, Aug 24, 2008 at 09:03

Sunday, Aug 24, 2008 at 09:03
My old HJ60 hadn't had an oil change for 12 months of running around town. I asked a mech what to do and he advised me to use the kero mix, run for about 1K with a cheap oil and then drain and do a decent oil change.
I did so and the engine ran for another 200K until sold.
In retrospect, I think that the flush addative might have been cheaper and better, but at the time it proved to be good advice.
AnswerID: 321937

Follow Up By: trainslux - Monday, Aug 25, 2008 at 15:31

Monday, Aug 25, 2008 at 15:31
Hi chaps.

Yes I know some of you have used kero, diesel mix in oil and gotten away with it, however there is a better way.

Oil flushes in petty motors usually state gentle driving, or idle only, due to the pressures involved in the big ends, and oil wiping.
Lets face it, lots of sludge, filled oil, then you thin it out, its chances of doing its job, and protectnig the surfaces there are much reduced.
Now with a diesel motor, where the full charge of air, and full compression pressures are acting on the big ends, you have far more chance of doing damage.

Either do a CEM flush where the motor is not run.
Or just put in new oil and filter, and change it each week for a month.

If you already have the rocker cover off, I would suggest getting a kero gun, and filling it with diesel, and spray down the sides of the oil drain galleries, this will clean off the sides of the motor, and the top rocker cover gear, then after you have finished , allow it to drain, pour some fresh oil over the now freshly cleaned rocker gear, and the oil galleries, say 3lts ish. and then remove plug again, and drain.
Now fill with oil, and start the oil change each week for a month, and allow the detergents in the diesel oil to do their jobs.
Wont take long for the oil to fill with soot and gunk from the motor.
Have revived many motors using the above method with good success.

If you choose to add stuff to the oil, and run it, well that s your choice, however I belive that what I have suggested is a better way.
Your choice !

Trains
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