Comp turbo leaking coolant from zerk fitting

MoulaZ

I didn't think much of it at the time when I was posting about the extra noise from my unit in my thread, but I did take some photos when I went back under to re-grease the turbo... those black marks near the zerk on the CHRA, could that have been some leaking grease and possibly why my unit needed additional grease well before the next service interval?

Attached Images

2019-11-23 11.20.13.jpg (359.9 KB, 29 views)

NeverBoneStck

I have the same black residue on my turbo blades. Comp said I sucked something in and knocked it off balance. But, there was no damage to the blades other than scraping on the edges. No other marks or damage. No warranty. Just upgraded some parts and shipping back to me today

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Jinxx

There wouldnt be any way for grease to leak out from the zerk around o-ring. ... the zerk is a hollow bolt that goes through the coolant chamber and threads in the bearing housing .. looks like the grease didn’t go in the zerk and built up around it on the outside

Boosted Performance

Correct, a zerk fitting simply cannot leak. It is essentially one way traffic (grease in) type of a fitting.

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MoulaZ

Little insulting you think I'm that much of an amateur. Not my first kit or platform. What is absolutely baffling me is why no one can seem to offer any suggestion to why I had to re-grease the turbo, half way through it's normal service interval with an amount well over the standard recommended amount (by COMP themselves no less)... with a Turbo that has since been confirmed there was a batch of them with some kind of zerk fitting issues. It still isn't sitting well with me and while I greatly appreciate Sasha's support, I can't help but hold onto some concern as to why it happened even time I give it a boot, and if I could just nail down the reason hopefully I can take some pre-emptive action and possibly help someone else identify signs to look out for.

Regardless. I've since cleaned off the marks, and keen to see if it'll happen again.

Jinxx

No insult was applied ... it was a observation and a statement on your picture .. there isn’t much that would cause it to look like that other than grease that didn’t go through the zerk ... you are complaining that you had to grease your turbo more than needed and then post a picture showing where grease didn’t go into the zerk and ask for clarification ... but refuse to consider that maybe you didn’t grease it correctly. .. what more do want anyone to tell you ... being the fact that you’re not a amateur and this isn’t your first kit or platform.

jchammond

I know this grease gets hot enough to liquify somewhat, and if perhaps the spring behind ball on grease zerk is a tad weak, I can see some seeping past it & causing a little buildup.
Options would be like what Caterpillar & some other Heavy Equipment vehicle’s have, would be to have a removable plug & then install grease zerk, lube, remove & plug.
Meritor also uses this on some of their HD truck suspension applications

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Rusty

Is there a plug opposite of the zerk fitting on the housing? 180 degrees. On a lot of equipment. There is a plug you remove before greasing the bearing. Once the plug is removed. You add grease until it comes out of the plug hole. Then install the plug back in the hole. Sometimes, we had to use a piece of wire to remove the grease that got hard in the plug hole.


On equipment with no plug hole. We only did between 3 to 5 pumps of the grease gun. Any more, and you took the chance of pushing grease past the seals.

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MoulaZ

Alright, let's analyze it and feel free to correct me.

1. If it still was my mistake, the only way I see it possible is I completely missed the zerk and just decided to blast the under side of the turbo with grease and completely ignored said grease. Seems quite unlikely.

2. The way it appears to have pooled suggests it was in a liquid state at the time. It is not liquid when pumping. But in the spirit of fairness it could have been point 1, and after taking it out and heating up it liquefied on the outside I suppose.

3. If we accept it was liquid at the time of leaking/pooling on the under side and I am correct in saying there wasn't a single smidge of grease on it when I finished and cleaned up, then that only leaves a leak with an, as of now, unknown cause.

4. Judging by the photo it is unlikely it leaked from the tip of the zerk, and appears it may have come from the base of the zerk on the CHRA somehow. How? I have no idea, hence all of this.

5. It's possible that black crap isn't grease at all and something else altogether. But then why so specifically in that area in that shape around the zerk base?

Me refusing to consider your explanation is not an ego thing, but when considering point 1 and possibly 2, makes it seem ridiculous. I had already considered it and given the observations above still felt it made no sense and sought other possible ideas on here. So... sorry?



I'd be fine with something like that were it an option.

Jinxx

It would be unlikely that any grease could leak out of the turbo and end up in that location ...if it leaked it would be from the tip of the zerk...inside the turbo the bolt is hollow and if leaking from the threads the hot water would carry it into the coolant system before it leaked outside the turbo ....one thing to consider is it could be a small amount of coolant leaking from the turbo and coolant can have a sticky residue that would collect dust like you see ...I did have similar build up right before my o-ring started leaking leaking badly ... with my grease gun when greasing it would slightly push the zerk to the side due to the grease fitting against the housing which allowed the o-ring to “ break its seal “ and it would get worse each time