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What's normal blow by?

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tim(sd)

06-03-2006 11:02:24

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Men:
Was hoping you could clear an issue up for me.I'm looking at a case 1170 with 5800 hrs.On initial start up it will have some darker exaust but clears up right away.Also under load at the beginning it will produce a little more dark smoke then clear up.What I did notice the more I work the tractor the more smoke or steam I notice comming out of the blow by vent tube.The smoke or steam isn't that bad at low rpm or idle just when I get to working the tractor hard.The tractor seem's to run and idle real good.What is normal for the blow by tube and what is not?Thank's in advance men.
Tim

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tim(sd)

06-04-2006 08:25:02

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Re: What's normal blow by? in reply to tim(sd), 06-03-2006 11:02:24

Thank's for all the insight to my question.This tractor is being purchaced for very infreqeunt use probably 40 hrs a year.I'm looking at putting a loader on it and it will be used for basic clean up.I like how this tractor starts and run's could a guy figure with some luck several years of light duty work even with some blow by?Thank's

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mowr

06-05-2006 22:07:39

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Re: What's normal blow by? in reply to tim(sd), 06-04-2006 08:25:02

If there is no serious oil or coolant consumption, one way people avoid breathing all these extra fumes (mostly carbon monoxide) is to install a hose, routing the blowby back into the intake. All motor vehicle engine manufacturers have been doing this since the early 60's. Carbon monoxide is a flammable gas so it doesn't make sense to waste it anyway.

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Steven@AZ

06-04-2006 07:11:53

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Re: What's normal blow by? in reply to tim(sd), 06-03-2006 11:02:24

Here is a description of serious blowby for you:

Neighbor had a 5088 with 8000 hours on it, when idling hot it would make a 5" circle of oil on the ground under the breather within 5 minutes.

Our 1256 has around 7700 hours on it and drips oil from the breather and there is a pretty good fog coming out of it all the time.

The 2590 Case has about 1000 hours on the overhaul and there is a very light fog doing field work, but no oil drip.

Black smoke is normal for an older diesel engine. Most of the Case tractors I have seen are shooting some black smoke under load.

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RAB

06-04-2006 01:36:31

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Re: What's normal blow by? in reply to tim(sd), 06-03-2006 11:02:24

Other option other than engine is subject to excessive wear, which is a likely reason for sale.
Has it been run only on light duty and the bores are glazed? Some real hard work might sort it out - or there again it could just get worse....
If it is steam, could be gasket or a crack, but usually antifreeze will go acidic pretty sharply, there will be gases evident in the rad, or the engine oil will soon look grey especially if the engine is run cool.
Regards,RAB

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mowr

06-03-2006 20:48:36

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Re: What's normal blow by? in reply to tim(sd), 06-03-2006 11:02:24

As the word implies, part of the combusting (burning) fuel/air mixture is blowing by the pistons and rings due to worn and/or weak compression rings. This erodes the pistons, rings and cylinders further causing more blowby, causing more erosion..... If you were buying this for infrequent, light duty use, it might serve well for years. Otherwise, your description sounds like you should figure a rebuild is not too far down the road, er...field.

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the tractor vet

06-03-2006 15:24:42

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Re: What's normal blow by? in reply to tim(sd), 06-03-2006 11:02:24

Well the only real way to tell if it is to much is to put the tractor on a Dyno and put a manometer on it as some blowby is normal and for not seeing the tractor myself i am shooten in the dark . As for the black smoke at start up that is normal and when the govener responds to load some black smoke is normal due to turbo lag . But from what i have seen of Cases if she has never been down before and it has lived this long then i would have to say that she is past time to have kits put in .

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RustyFarmall

06-03-2006 13:26:20

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Re: What's normal blow by? in reply to tim(sd), 06-03-2006 11:02:24

5800 hours of hard use is enough to wear out an engine. Either walk away from that tractor or buy it cheap enough that you can afford to pay for a complete engine overhaul.

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Tod in Ohio

06-03-2006 13:25:31

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Re: What's normal blow by? in reply to tim(sd), 06-03-2006 11:02:24

I had a John Deere 2440 that had steam coming out of the blow by tube and everybody told me not to worry about it. I had it in to the dealer for some other workand asked him to look at it. It turned out to be a blown head gasket.

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hay

06-03-2006 12:25:51

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Re: What's normal blow by? in reply to tim(sd), 06-03-2006 11:02:24

sounds like the piston rings are getting really worn. do a compression test to find the weak cylinder. with 5800 hrs, it's probably needing a complete overhaul, IMO.

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Jerry/MT

06-03-2006 11:17:04

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Re: What's normal blow by? in reply to tim(sd), 06-03-2006 11:02:24

Boy that's a tough question! You're looking for a definite answer to a subjective problem. With 5800 hrs of heavy farm work, I'd expect a diesel tractor to have some blowby from normal wear and it should increase as you demand more power from the engine because the combustion pressure increases. How much is normal versus how much is abnormal is a judgement call. The best way to determine the condition of the cylinders/rings is to do a compression test. To do that you need a diesel compression gauge and adapters and you need to remove the injectors.

I don't know how I would describe serious blowby but I'd probably know it if I saw it. If the tractor starts well in cold weather and otherwise runs fine and if the blowby just looks like a vapor (not bluish smoke) with no oil dropets in it and it doesn't feel like a real rush of gas out of the vent pipe I'd say it was normal.
Hope this helps you.

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