Cat 3406 industrial blowing oil out exhaust

[2DASEA]

Hi Folks, I've got a Cat 3406b industrial serial # 90u1903 in my fishing boat. The motor has only 140 hrs since major overhaul, new everything.
It leaked oil out of the bottom of the turbo when warming up and would then clear up. thought I had a problem with the turbo sealing up and thought I was getting oil from supply line to turbo. Pulled the turbo, installed brand new Borg warner unit and leak persisted. That means oil is coming straight out of the exhaust manifold! I didn't think of this as everything is new in the engine... Wondering what could be going on in there. I don't have a lot of experience with Cats so before I tear into it I thought I'd troll around a bit see if I hook something from the experts.....

[Nige]

It would either be coming from a damaged piston/ring combination or maybe from the cylinder head or the head gasket.
Who overhauled it ..? I'd be talking to them before I started messing with it myself.

[big ben]

Ya the term "overhaul" is way to loose now days but glad to hear everything was done in this case..... By bottom of turbo, is that before it enters the turbo at the mounting gasket or on the exhaust side after the turbine ? Was it doing this before by chance? New head (grasping at straws but valve guide seals missing) ? New piston/liner packs (Cat was known to forget to ring piston's a couple of years ago on reman kits) ? Must have a fair amount of blow-by or is the blow-by tube still capped off or something strange ? If there is that much oil, could you see which end of the manifold has the oil with the turbo off ?

[CRAFT]

I'm thinking in the head too ..... not piston rings, if it was rings you'd have a bad smoke problem and possibley alot of blow-by), the oil would burn away and not show where you are seeing it ........ I would check as mentioned , valve seals or even a leaking (bad seating) head gasket ..... if it is you may want to pull the exhaust manifold off and see which cyl its coming from ....... just some simple suggestions ....????????? let us know if you find out and let the HEF encyclopedia grow ...LOL... good-luck

[2DASEA]

Thanks for the advice, I would love it if it were something as easy as torquing the head.... I'm taking the boat to the yard for painting, but as soon as I'm back at the dock I will dive in. I'm not too sure how I will know whats up without at least removing the head, but I may check the torque on head bolts first. I also thought of doing a compression test to see if I have a low cylinder. there is a spacer plate that has a seal and I understand there are some o rings in there somewhere for the oil feed to the valve train. Any thought s here?

[CRAFT]

Who did the Overhaul ? ...... I mean if it was a shop they should stand behind the work ....NO ???

[2DASEA]

Overhaul was performed by previous owner who also built the boat. I have 100% confidence in his abilities.The motor was originally an industrial compressor motor that was traded in for a new unit because of a hard starting problem. P.O. bought the motor, completely disassembled/washed and reassembled. Only found a weak starter and perhaps a fueling issue. He got IPD rebuild parts from Radtke and reported all went together well and was satisfied with rebuild.He mentioned that Radtke gave him a newer Spacer Plate which didn't fit so he tracked down the correct one. Used keystone style rings supplied by Radtke.New pistons,sleaves, rod bearings,main bearings, Had rods refurbished. Sent head in for rebuild. after it all went together had pump re calibrated. Engine runs beautifully except for this GD oil leak.
Talked with Dan at Radtke yesterday, he recalled way back people that had done rebuilds on these coming up with what was thought leaky turbos, They discovered the Dello oil used during break-in the wrong viscocity and cylinders were getting glazed and oil was found being pushed up into head. they have since switched to using a special break-in oil now and running motors @ 120% duty for some period.... I'm not sure this is my problem as P.O. described leak fro the get go, and figured turbo just needed to seat in properly and lived with the leak,which would clear up after engine got warmed up.

[2stickbill]

Something you might check just for fun.I in framed a J.D. Diesel one time that was blowing oil out the exhaust.Instead of letting me check it he insisted I in frame it.Well it was doing the same thing.Found problem.Oil drain line on turbo was stopped up not letting oil drain from turbo.

[Nige]

What oil are you using right now ...? Has the engine always been on this oil..? I have never in my life heard of anything like a "special break-in oil" to be used on Cat engines.

When listing the details of the rebuild I see no mention of the turbo. What (if anything) was done to it..?

Glazing of piston rings & liners is very common in genset engines that run for long periods on low load (typically 20% or less). Once they're glazed the only option is to open them up and re-ring the pistons plus glaze-bust the liners.

I like the idea above of the turbo drain line ........ worth a look.

I'll say right now I am not a fan of IPD Parts based on past experience.

[CRAFT]

Me either ! ..... have never heard of an oil just for break-in ...BUT I have heard never use a full synthectic oil on either a new or rebuilt engine, due to not allowing the rings to seat in properly....

But I will say that oil brands do effect oil consumption .... we always found that 15w-40 Delo 400 worked the best with our Cat engines ...... but we are talking about consumption not loosing/leaking between oil changes ..... it is normal at times to USE 2-3L (quarts) of oil in 250hrs run time in a truck (which will hold 44L w/retarder).... but it never shows like we are hearing here, like running out of the turbo ? ..... so because we are talking Diesel here, there can be no way a running under load not idling engine will allow oil to bypass the rings to a point of running out the exhaust ports after a combustion stroke, in no time would there be any oil left in the crank case ..... am really curious what the out come of this problem will be ??

[2DASEA]

turbo that was on the motor was also rebuilt.I agree that the amount of oil I'm getting is unlikely coming from blowby. drain line from turbo is clear, had to remove lines when I changed out the turbo.Been using Dello 15-40....

[Nige]

What brand is Dello..? Never heard of it. Does it meet some API specification like CI-4 or CJ-4..? That's just out of curiosity, I don't think the oil is your problem unless as Craft says it's a fully synthetic and so could possibly raise an issue after a full rebuild.

Personally I would remove the turbo and see if there is oil in the exhaust manifold. That would indicate if the oil was coming from the turbo itself or the engine.
If oil is in the manifold then the next step is to pull it and see which cylinder, or cylinders, the oil's coming from. After that it's probably going to be head off time.

Reading back to yuor earlier post I'm sure in my own mind the guy from Radtke was feeding you a line, however much he himself might have believed what he was telling you.

[DPete]

Nige, Delo 400 15/40 is Chevrons premium diesel engine oil on par with Shell Rotella. Don't know about the oil leak but a 3406 doesn't like prolonged idleing if that might be the case.

[Nige]

Dan, What threw me was the spelling. I Googled it after and found it was a Chevron product. Also interesting is that the synthetic version of DELO is an SAE 5W-40 rather than the 15W-40 the OP says he's using, so that would appear to rule out the issue of synthetic oil mentioned earlier.

I take your point about 3406's not liking extended idling but to be throwing oil out of the turbo immediately after a rebuild (even though it originally stopped when the engine was warm, but doesn't now) doesn't look like an idling issue to me. Surely that would only appear over time..?

[Nige]

Double post ...........