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JackG
Member
Member # 44196
Reged: 06/03/04
Posts: 6
Cat 3126
#1832228 - 06/03/04 10:31 AM

I'm new to the forum. My 97 Cat 3126 has started puffing white smoke from the vent tube attached to the top of the fuel filter. Am I in trouble or what? Was told it is probably ring blow-by. Is this a big bucks fix? Appreciate all the info I can get before taking it to a local shop.

Edited by JackG (06/03/04 05:28 PM)

99SD
Member
Member # 40608
Reged: 03/21/04
Posts: 27
Re: Cat 3126 new
#1833190 - 06/03/04 09:06 PM

Not familiar with a vent tube on top of the oil filter. But all mine have about a 1" diam tube that runs from the breather on top of the valve cover, and down the side of the engine on the drivers side, and exits right about the starter. Is that it? 1. Did this start all of a sudden? and 2. Has the valves been adjusted recently? I think Cat recommends every 18-24 months depending on total hours used. And, from my experience, they can make that engine due some weird things. Smoking. Skipping. Rattling. Popping through intake/eshaust. Low power. Weird running. Not running. If it was a gradual thing, and is blowing oil all over the starter and undersides, might be a tad more serious. 3. Any codes? Don't know what make of vehicle, but you can pull them up with the cruise control. Probably a long shot, though. Sounds like you need to visit your local cat dealer and become friends with him. A new 3126E 300 hp is about $9500, exchange, on the skid, with a 3 year warranty, from Cat. I know you didn't want to hear that!!! Hope this helps.

JackG
Member
Member # 44196
Reged: 06/03/04
Posts: 6
Re: Cat 3126 new
#1833727 - 06/04/04 08:25 AM

Thanks for the info. The truck is a '97' FL60. The vent tube is coming out of the top of the fuel filter and is venting the block. I checked for codes and got a "55" which I believe is "no code". The puffing started in the last couple of weeks. Would the shop be able to figure it out pretty easy with a computer diagnosis? Being retired now it is pretty tough looking at that much $$. Hope it is as simple as adjusting valves!

Fred Hemer
Member
Member # 427
Reged: 04/05/99
Posts: 6143
Loc: Nanaimo B.C. CANADA
Re: Cat 3126 new
#1834724 - 06/04/04 08:14 PM

Take the oil fill plug out and run the engine if it is a steady or somewhat smooth stream of fumes its normal blow by ,if its Puffing you may have a broken ring.Usually the quickest thing to do is pull the pan and turn the engine over on the starter and watch which cylinder is blowing by from beneath.

JackG
Member
Member # 44196
Reged: 06/03/04
Posts: 6
Re: Cat 3126 new
#1835927 - 06/05/04 08:19 PM

Thanks for the feedback. It is puffing, not a steady flow. Is there a chance of one or more rings stuck? We use the truck for infrequent trips lasting for 3 or more hours then it sits. Someone mentioned using a product called "Sea Form" or something sounding like that. It is added to the oil then the truck is taken on a good long trip so the product will work on the rings. Anyone have experience with this?
All input is appreciated. I hate to tear in to the cat but if all else fails - - - -!!

Fred Hemer
Member
Member # 427
Reged: 04/05/99
Posts: 6143
Loc: Nanaimo B.C. CANADA
Re: Cat 3126 new
#1838243 - 06/07/04 11:32 AM

If the unit is puffing I highly doubt seafoam will help!BUT maybe worth a try?If the condion you had was a smooth bloby condion and oil consumption I would, hold out hope for seafoam,A condion this bad will require you to remove the pan and check for the bypassing piston or pull the exhast and find the wet exhast port which ever is cheapest!My suggestion to you is ,The pan would be cheaper and quick and you can still back up if you deside you don't want to tackle the job!
All its going to cost you at that point is and oil change and a pan gasket!

Just another tip ,Have someone crank on the starter with the fuel pump disarmed and listen at the oil filler you will likly hear woossshing sound as the offending piston passes TDC!
Also check this post out give it some thought.
http://forums.thedieselstop.com/ubbthreads/showflat.php?Cat=&Number=1837738&page=0&view=collapsed&sb=5&o=31&fpart=1

JackG
Member
Member # 44196
Reged: 06/03/04
Posts: 6
Re: Cat 3126 new
#1838743 - 06/07/04 04:42 PM

Great advice. Thank you. I will give Seafoam one shot and if no improvement then off comes the pan. If the head has to come off it is probably a wise investment to just go ahead and do a complete ring job. What about lower end bearings and oil pump (with only 100K on engine)?

Fred Hemer
Member
Member # 427
Reged: 04/05/99
Posts: 6143
Loc: Nanaimo B.C. CANADA
Re: Cat 3126 new
#1841006 - 06/08/04 07:58 PM

Remember I am know expert on this engine just observations from lots of others.
Your call on the bearings ?Depends on the price and what ya see when ya get there!Remember That YOU ARE THERE!!And For the time it takes well???? you know!

JackG
Member
Member # 44196
Reged: 06/03/04
Posts: 6
Re: Cat 3126 new
#1843892 - 06/10/04 10:06 AM

One last question, am I stuck getting parts from Freightliner or are there other sources? Thanks for all the help.

Edited by JackG (06/10/04 10:06 AM)

B1powered
Member
Member # 34782
Reged: 09/14/03
Posts: 792
Loc: South Central Pa.
Re: Cat 3126 new
#1844770 - 06/10/04 07:22 PM

Ge to a CAT dealer for the parts you need. The know the engine ALOT better than most of the Freightliner Morons!!

Fred Hemer
Member
Member # 427
Reged: 04/05/99
Posts: 6143
Loc: Nanaimo B.C. CANADA
Re: Cat 3126 new
#1844804 - 06/10/04 07:41 PM

Quote:

Go to a CAT dealer for the parts you need. They know the engine ALOT better than most of the Freightliner Morons!!




i agree with that statment if you can find a cat place ,deal with them!
Get all the numbers you can off the engines valve cover!Serial and the all important "Arangment" number,when ordering your parts!Their parts people can,t work with out it!They will stand there with a stupid look on there face and say I need the arangment number

JackG
Member
Member # 44196
Reged: 06/03/04
Posts: 6
Re: Cat 3126 new
#1846159 - 06/11/04 04:04 PM

You folks are great! Thanks for all the help. I'll post the outcome, whatever it turns out to be.

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