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Discussion Starter · #1 ·
What would you do in this theoretical situation?

Situation: -

Bearings fail on steel turbocharger on an RB GTR engine.
Inspection of failed turbo, shows that some fragments of bearings are missing.
Probability is that missing fragments are in RB sump via turbo oil feed/pick-up.

Engine fine. Compression fine.

Would you: -

a)
Drain engine oil. Remove engine in order to remove sump. Double check. Put back together. Engine in. New oil and filter. Labour alone costing £1000+.

b)
Is there another viable option or available method that would eliminate need to remove engine - minimising any future risks to very good/expensive engine?

:nervous:
 

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I would:

*Drain engine oil, examine it for bits.

*Change oil filter, re-fill with oil.

*Repeat process after 1000miles.


If your paranoid about foreign particles in your engine, you will freek out when you see how much casting sand is still left loosely attached to your average RB block :runaway:

thank god for oil filters ;)

Although it does depend on how big the pieces of bearing are likely to be. Big enough to destroy the oil pump?
 

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Discussion Starter · #3 · (Edited)
Will seek clarification on estimated size of missing bearing fragments.

FYI
Oil pump = HKS.
Turbochargers = HKS 2540's.

What path would the bearing fragments travel from the faulty turbocharger to end up in the sump? Oil pick-up piping or oil return piping? Are these meshed, gauzed or filtered at all?
 

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Would come straight down the oil return pipe. Nope no filters or gauze.

Did engine carry on running after Turbo's destroyed themselves?

Did both Turbo's fail?

Perhaps remove each Turbo return pipe, and insert magnet into block to pick up debris local to turbo drain areas?
 

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Discussion Starter · #5 · (Edited)
After occurence: -

Car driven back carefully. Engine ran and idled fine. Could be keyed off and on.
Turbochargers sounded a little "noisier" than usual over the usual noise of engine.

Both turbochargers removed and sent off for inspection/rebuild quotation.

Fault occured due to them overheating - no turbo water cooling line system present - running to and from them - long story.

Inspection showed that rear turbo worse than front one.

Front turbo - bearings in bad way, needs new core and slight scoring to housing that may polish out
Rear turbo - bearings collapsed, needs new core and very bad scoring to housing rendering it scrap

Turbo inspection centre advised that from the collapsed bearing on the rear turbo, fragments of the bearings were deemed as missing and would more than likely be in the sump of the engine.

£2000+ to rebuild HKS 2540's.

Cheaper to buy new pair Garrett 2860's, which is route of choice at present.
 

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Any big bits won't get through the sump pick up gauze, and very small bits probably have already. Short of a TOTAL engine strip, clean and reassembly you are just hoping you get all the shrapnel if you just drop the sump and wash it out with the pick up. You might as well leave it as is and "hope" :)
 

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Discussion Starter · #7 ·
OK, bit of clarification...

HKS 2540's have ball bearing cartridge consisting of 8 small metal ball bearings and these ball bearings are all held in place by circular structured hardened plastic cartridge.

In this case... one ball bearing and half (crescent moon shaped) of cartridge is missing - presumed in sump. Other bits are all present.

Also, got it mixed up: - front turbocharger was worst of two.

Rear turbo - bearings in bad way, needs new core and slight scoring to housing that may polish out
Front turbo - bearings collapsed, needs new core and very bad scoring to housing rendering it scrap

Guessing missing ball bearing, if present and complete, should come out with oil when drained - cartridge section, may not, depending upon what state and shape it is still in. Plastic though, so may not be as "lethal"... :nervous:

Chris, I see your point and do kind of agree.

Any other views or feedback from similar experiences or situations?

Drain, flush, hope for best in terms of what comes out with the oil.
 

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It's simple in your case then. Beg, buy or borrow a pickup strainer, see if a ball from the ball bearing will pass through the mesh. If it will you have problems. If it won't just hope one never manages to get up into the head, as a cam lobe trapping it against a lifter will not be pretty. Chances are one WON'T get up top.... At least you haven't got gear drives or chain drives down in the bottom end.
 
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