Caterpillar blowby test

View Full Version : excessive blowby. Can it be turbo? Competition Diesel. Alright, So i've been reading up about this blowby problem that has been occuring to me and it seems like it isn't so much the valves out of wack anymore. I recently read a fourm about the turbo being the problem.

The kid said he took his return line off the turbo and the haze out his blowby tube vanished. I would look other places besides a turbo for blow by issues.

I would run a leak down compression test like recommended above to find the cylinder. My guess is rings of HG. Had 2 C15 Acert cat's with huge amounts of blow by enough to blow the dipstick out and make a puddle of oil out blow by tube and both times it was the top turbo, I wouldn't rule it out. That may knock a little static compression off the low end due to overlap. Could be the turbo oil seal, sure. More likely is the rings. I might rebuild my turbo soon anyhow the radial play is a lot more than normal.

Had a turbo blow out a tappet cover gasket on a buddies truck he just bought. Found oil in the exhaust rebuilt the turbo and all blow by was gone.

FYI if you do a turbo rebuild do not buy an ebay kit. Lot of scumbags out there peddling chinese pot-metal crap to the unsuspecting. How can turbos cause blowby? Pressure side compressor leaking into center section.

Highly unlikely in a single charger application. We have seen it with the acert Cats though. Lots and lots of acerts. You have to have proper tooling, but you can pull the return line and crank case pressure will drop or stop.

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I got mine in the shop for some work, gonna have the tech look over the turbo and the valve seals. Id be doing this crap myself but its like single digits, 4' of snow and I have no garage here. Looks like you need to machine the head to use the top hat style valve seals. I got k on the motor i mean its a steady haze when its warm but its noticable if you get under and look.

Its not like pouring out but theres some there.Thomasbus24 Administrator. USA Posts. United States Posts. BJ Henderson Advanced Member. BrokenBus Active Member. It got all 6 injectors replaced in July of due to hard starts and a miss that nobody could track down.

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Compression tested like that of a new engine at that time. Hard starts and the miss were cured. The last few years it's had a lot of blow by, but now it's excessive to the point that you don't even want to stand by it when it's on high idle. It used 3 quarts of oil last week miles and looks like about 2.

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My gut tells me its broken a ring or two or ten. I still want to believe it's just the air compressor or turbo. Any guidance? If it needs an engine, it needs an engine I have to keep it.

How have you guys pin pointed Cat failures? The ones I've been personally involved with were clear cut and consisted of a nasty miss when it was the common broken ring sor popping back through the intake roller lifter failure. The engine has to be sleeved and re-bored to std. I think we have a Christmas break project on our hands though. I've been told if you can see the debris in the oil, the lab can't pick it up.

Blow-by @ idle pictures???

Something about having to be small enough to be burnt to be detected. I'm not sure how they do an oil analysis. Anyway, My money is on a broken ring. Probably number 5. Don't ask my why, I don't have a clue as to why they do it. However, I have had four in my fleet of 17 develop broken rings. Two had k within 77 miles of each otherone had K, and the other had K didn't fix this one. LOL, this is the reason I like this job, you just never know what is going to happen next.

The best part is, I get to try and prevent the problem by changing methods and purchases from the onset go propane! Other than that, I see no use for them. On that note, it's going to be 48 tonight I gotta plug in 3 of the 7 Cats!

It's no where near as complicated as the VT Bryan second. That would be what I would do at this point. Plus, check that turbo, like you said. Compressor, too.Discussion in ' Trucks [ Eighteen Wheelers ] ' started by liftedtrucks4meMar 3, Log in or Sign up. Find Trucking Jobs. Mar 3, 1. I am looking at a 06 KW W It has a CAT C15 twin turbo. We took it to our mechanic to see if its worth it in the long run. The mechanic said it has alot of blowby.

Is this normal for the motor or signs of it going south. The dealership says its normal but the guy is a salesman and just trying to move trucks off the lot.

Thanks for the help. Yes, let employers and TruckersReport text me with new opportunities, job alerts and other career information to the number I provided.

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There is no charge for this service, but standard message and data rates may apply. Mar 3, 2. Mar 3, 3. Alot of blow by is normal for this motor. Cat sells a kit for these motors to solve some of the oil issues with the blow by, my motor has it but i still have blow by and some oil comeing out but not nearly as bad as it was.

Mar 4, 4. TimberTaxiMar 4, Mar 4, 5. Rock haulerMar 4, Mar 4, 6. The only way to say if this motor has excessive blow by, is to put it on a dyno and measure the amount of blow by under full load. These engine will huff a considerable amount of blow by while idling.

The engine rings are designed to work against cylinder pressure and seal the blow by off under load. CAT has had many complaints about excessive blow by on these engines. HaneyMar 4, Mar 4, 7. I presently own a '06 t with a c15 twin turbo. It does however collect on the steering axle in the winter and then make a mess in your shop when it thaws. HammerMar 4, Mar 4, 8. Mar 4, 9. Mar 4, Show Ignored Content.

Draft saved Draft deleted.Revision This is a preview of the paper, limited to some initial content. Full access requires DieselNet subscription. Please log in to view the complete version of this paper.

cat twin turbo question

The crankcase of a combustion engine accumulates gases and oil mist—called blowby —that can leak from several sources. The most important source of blowby is the combustion chamber, Figure 1 [].

caterpillar blowby test

Most of the combustion blowby occurs when the combustion chamber pressure reaches a maximum, during the compression and the expansion strokes. At high pressures, the gases leak to the crankcase around the piston rings and through the piston ring gap.

Other important sources of blowby include the turbocharger shaft, air compressors and in some cases the valve stems. The oil drain line from these components ensures that gas leaking past the turbocharger shaft and the piston rings of an air compressor will pass into the engine crankcase contributing to blowby.

Blowby amounts vary greatly depending on engine design, temperature operating conditions and engine wear.

Blow-by @ idle pictures???

Some of these estimates are outlined in Table 1. Abstract : Crankcase blowby gases can be an important source of particulate emissions, as well as other regulated and unregulated emissions. They can also contribute to the loss of lubricating oil and to fouling of surfaces and engine components. A number of crankcase ventilation systems have been developed which include various types of filters to separate particulate emissions.It contains a large 38 mm 1.

It is designed to monitor the blowby volume on Caterpillar and series engines and the larger D series engines as well as competitive large engines. The range of this pickup is 94 to Liters Per Min. Due to its all metal construction and large size, it is suitable for permanent installation on engines so blowby can be continuously monitored, making it useful for dynamometer rooms or marine or gen set installations. The pickup group can also be used to measure air velocity such as radiator cooling air flow.

This blowby value can be used as an indication of engine condition. It can be used as a signal that other engine condition indicators such as oil consumption, low power, hard starting, and excessive fuel consumption should be checked to determine if an engine is in need of maintenance. The large blowby meter has no moving parts. An ultrasonic sound vortex shedding principle is used to measure the air flow.

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This principle makes the pickup reliable and virtually maintenance free. This unit will be used to replace the smaller 8T Pickup for the measurement of series engine blowby. The 8T Pickup can be used on these engines, but only for a short duration test since the Refer to Installation of the 1U Conversion Group.

This includes the larger Caterpillar D Engines, the and series engines. Smaller D and engines may not have enough blowby at idle or partial load to give a reading when they are in good condition.

Therefore, the indicator display will read zero until the engine is loaded.

caterpillar blowby test

Supplies 11 to 20 Volts DC at 0. This integrated circuit contains the program which makes the large pickup readings accurate. The 1U Conversion Group 1 is the small plastic box packed in the front storage area of the large pickup case. Open the small plastic case to identify the conversion group integrated circuit memory, but DO NOT remove it at this time.

It should be marked " 1U Blowby Gp. Use the following instructions to install the integrated circuit in the 8T Indicator which will be used with the large blowby probe.

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The 1U conversion group integrated circuit memory may be damaged by static electricity discharge. DO NOT handle in a carpeted, dry, area where static electricity may be present.Discussion in ' Trucks ' started by powerjokeJan 2, Log in or Sign up. Heavy Equipment Forums. Thank you for visiting HeavyEquipmentForums. Our objective is to provide industry professionals a place to gather to exchange questions, answers and ideas. We welcome you to register using the "Register" icon at the top of the page.

We'd appreciate any help you can offer in spreading the word of our new site. The more members that join, the bigger resource for all to enjoy. Thank you! Thank you for joining Heavy Equipment Forums!

If you are new to forums we communicate with "Threads", please search our threads to see if your topic may have already been answered and if not then click "Post New Thread" in the appropriate forum. This will allow all of our members to see your question and give you the best chance to be answered. After you've made a number of posts you will graduate to Full Member status where you'll see a few more privileges.

Following these guidelines will help make this the best resource for heavy equipment on the net. Thanks for joining us and I hope you enjoy your stay!! Welcome to HeavyEquipmentForums. Bad turbo equals blow-by Discussion in ' Trucks ' started by powerjokeJan 2, A few weeks ago I posted about needing to locate a rebuild kit for a E because of excessive blowby, the other day we went to order a kit for it and it crossed my mind Why all of the sudden did this thing have crazy amount of blowby, truck runs and starts great no smoke no problems other than developed a lot of blowby within a couple of weeks.

I thought about it and after I realized that if I took off the air tube and placed my hand over it the blowby tube would almost whip around After calling a few turbo shops to find one I asked them if they pressure checked them and the response was always NO and one of them called me crazy for believing that a turbo could cause blowby Long of the short, turbo on the ground with the exhaust down intake up, dump water in the intake and watch it run through the cartridge faster than your pouring it in Flip it over pour in exhaust and does the same thing.

caterpillar blowby test

Anyone else ever ran across a turbo bad enough to do this but does not smoke the stacks? Oh btw the shaft only wiggles a little not enough to trash the compressor wheel or housing etc. Yes, I have seen turbos cause blow-by.

Measure your blow-by then remove the oil drain hose from the turbo and run it into a pail and measure your blow-by again. That will answer your question. Dad5Jan 2, I have only seen it once and that was on a Cummins QSC8. When I talked to a couple of other mechanics they all said the same thing, that they had seen it or heard of it at least once.

I think its one of things that can happen but isnt the first thing that you think of when you have excessive blow-by. Good idea about testing blow by after removing the turbo drain tube that would have been interesting to see what the results are. Does this unit have a waste gate? I've seen the gates get frozen closed or partially open and they start getting too much boost.

That creates some extra blowby and I've been told it can get head gaskets. John C. Joined: Aug 13, Messages: Location: southwest pa. PJ let me know how this works out.Log in or Sign up. Heavy Equipment Forums. Thank you for visiting HeavyEquipmentForums. Our objective is to provide industry professionals a place to gather to exchange questions, answers and ideas. We welcome you to register using the "Register" icon at the top of the page.

We'd appreciate any help you can offer in spreading the word of our new site. The more members that join, the bigger resource for all to enjoy. Thank you! Thank you for joining Heavy Equipment Forums!

If you are new to forums we communicate with "Threads", please search our threads to see if your topic may have already been answered and if not then click "Post New Thread" in the appropriate forum. This will allow all of our members to see your question and give you the best chance to be answered.

After you've made a number of posts you will graduate to Full Member status where you'll see a few more privileges. Following these guidelines will help make this the best resource for heavy equipment on the net. Thanks for joining us and I hope you enjoy your stay!! Welcome to HeavyEquipmentForums. Blow-by idle pictures??? Joined: Jul 7, Messages: 1, Occupation: President and all else that needs done!

Location: New York. While looking at equipment on Iron Planet like telehandlers they always have have a picture and states blow-by idle. What is this telling me about the the engine condition?

Last edited: Mar 6, SpeedpupMar 6, Joined: Nov 1, Messages: Location: Ontario. I know if you have excesive blow by, that indicated the engine has wear.

More than likely worn rings alowing presure from the combustion chamber to enter the crank case. Then would be released through the oil fill cap as seen in the picture. Not sure if you would be able to see smoke in the picture or not? Hopefully someone with a little more noledge will help tune in on the subject.

Blow By.


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