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  #1  
Old 05-14-2011, 01:37 PM
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Newb Blowby question

Hey guys

So I went and started up my 300D today and I noticed a tiny bit of oil around the black rubber tube that feeds over to the air filter housing. I randomly decided to check for blowby, and I do see a little. In my opinion, it's not noticeable unless you're really looking for it. I'm wondering if this is anything to fret over? It's going in for A/C service tomorrow, so should I have a compression test implemented while it's in there?

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  #2  
Old 05-14-2011, 02:27 PM
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Most people here will probably say that they've never seen one without blowby... however if you want to be sure that there isn't a problem (in my opinion) is to do a leak down test:-

http://en.wikipedia.org/wiki/Leak-down_tester

This is arguably more reliable than a compression test - but you could do one of those too if you want.

But before you spend the extra cash why not post a video somewhere and ask advice from us good folks here?
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1992 W201 190E 1.8 171,000 km - Daily driver
1981 W123 300D ~ 100,000 miles / 160,000 km - project car stripped to the bone
1965 Land Rover Series 2a Station Wagon CIS recovery therapy!
1961 Volvo PV544 Bare metal rat rod-ish thing

I'm here to chat about cars and to help others - I'm not here "to always be right" like an internet warrior



Don't leave that there - I'll take it to bits!

Last edited by Stretch; 05-14-2011 at 02:28 PM. Reason: Added the video bit
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  #3  
Old 05-14-2011, 02:28 PM
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Quote:
Originally Posted by Tanksowner View Post
Hey guys

So I went and started up my 300D today and I noticed a tiny bit of oil around the black rubber tube that feeds over to the air filter housing. I randomly decided to check for blowby, and I do see a little. In my opinion, it's not noticeable unless you're really looking for it. I'm wondering if this is anything to fret over? It's going in for A/C service tomorrow, so should I have a compression test implemented while it's in there?
If you barely have only a little blow by I would say that is better than average.

If you had a lot more blow by there is little that can be done with the exception of an Engine overhaul. Consensus is drive your Car and be happy it is running well.

Some things that have worked for some are:
changing the Valve Stem Seals
Soaking the Pistons in Marvel Mystery Oil or something else to loosen sticky Piston Rings (Marvel Mystery oil results sticky rings
Original thread also has + response http://www.peachparts.com/shopforum/showthread.php?t=258757&highlight=Marvel )

Some have said using Synthetic Oil freed up their sticky Piston Rings after driving 200-300 miles.

But, your Engine sounds like it needs none of the above stuff.

I have changed my Valve Stem Seals and done the Marvel Mystery Oil soak and have not seen any noticeable difference in my Blow by; not any better.

One of the main reasons I did the below because I was tired of the blow by Oil condensing in my Air Filter Housing and the U-intake Tube.
Even with the mod I still have a little wetness from Oil when I check it every 6 months in the Intake but at least it stays away from the Air Filter element.
 
Washable Air Filter and Intake Mod , With Larger Breather
http://www.peachparts.com/shopforum/showthread.php?t=280376
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  #4  
Old 05-14-2011, 02:57 PM
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Quote:
Originally Posted by Army View Post

But before you spend the extra cash why not post a video somewhere and ask advice from us good folks here?
The video camera I have access to isn't the best. I might be able to borrow my dad's Droid phone and take video on that. But I'll see what I can come up with.

On a completely different note, however, I finally got around to posting pics of my dad's SDL, if anyone's interested?
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  #5  
Old 05-14-2011, 03:00 PM
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Based on how you describe it, don't fret about it.

I can't remember if the seal on the oil filler cap can be changed, or whether you have to buy a whole new cap. In either event, if you have that little blowby, it's the seal that's the issue and not the wear in the motor. Fix the seal issue and don't worry about the rest right now.

If you notice the blowby is noticeably worse in, say, a month or two, then possibly you have an internal issue and you might want to try one of the suggestions for a compression test, a leakdown test, or taking a shot at freeing up rings.

But frankly it sounds like a non-issue to me. Relax and enjoy
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2002 e320 4matic estate│1985 300d│1980 300td
Previous: 1979 & 1982 & 1983 300sd │ 1982 240d

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  #6  
Old 05-14-2011, 04:01 PM
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Quote:
Originally Posted by Tanksowner View Post
The video camera I have access to isn't the best. I might be able to borrow my dad's Droid phone and take video on that. But I'll see what I can come up with.

On a completely different note, however, I finally got around to posting pics of my dad's SDL, if anyone's interested?
OOOO goodie pictures - yes please.
__________________
1992 W201 190E 1.8 171,000 km - Daily driver
1981 W123 300D ~ 100,000 miles / 160,000 km - project car stripped to the bone
1965 Land Rover Series 2a Station Wagon CIS recovery therapy!
1961 Volvo PV544 Bare metal rat rod-ish thing

I'm here to chat about cars and to help others - I'm not here "to always be right" like an internet warrior



Don't leave that there - I'll take it to bits!
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  #7  
Old 05-14-2011, 04:21 PM
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Thanks for the responses everyone. I realize newbs like me must ask these questions a hundred times over, but for all you veterans out there, I'm speaking for all newbs: thanks for helping us along the way to becoming vets. Hopefully the meticulous amount of attention I pay to the car will pay off in the long run.
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1987 300SDL
1970 Jaguar E-Type OTS
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  #8  
Old 05-14-2011, 09:19 PM
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blowby or whipped up oil mist?

My car has no appreciable blowby. The oil cap will sit there fairly benign, no smoke/gas coming up.

However, pull off the cap and the oil whipped and flung around in there will make an aerosol mist that will make a real mess.
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1985 190D (169k)
1991 350SD (113k)
1991 350SD (206k)
1991 300D (228k)
1993 300SD (291k)
1993 300D 2.5T (338k)
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  #9  
Old 05-14-2011, 10:03 PM
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Quote:
Originally Posted by Zacharias View Post
Based on how you describe it, don't fret about it.

I can't remember if the seal on the oil filler cap can be changed, or whether you have to buy a whole new cap. In either event, if you have that little blowby, it's the seal that's the issue and not the wear in the motor. Fix the seal issue and don't worry about the rest right now.

If you notice the blowby is noticeably worse in, say, a month or two, then possibly you have an internal issue and you might want to try one of the suggestions for a compression test, a leakdown test, or taking a shot at freeing up rings.

But frankly it sounds like a non-issue to me. Relax and enjoy
Phil has the seals for the oil cap, and the seals for the gas cap too!
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  #10  
Old 05-14-2011, 10:49 PM
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When I first bought my 83 300D turbo, it was slow and smokey, always lot's of oil in the air cleaner housing. I have since adjusted the valves many times, put in new Monark nozzles, adjusted IP fuel pressure, adjusted the ALDA and boost, change the oil on schedule, drove it hard. The car is running better than ever and I noticed recently that the oil filter housing is clean and free of oil. I do not remember if there was blow-by when I bought the car but it does not have any now, oil cap sits
steady and no smoke coming out.
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  #11  
Old 05-15-2011, 03:32 AM
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When there is so much pressure in the crankcase that oil gets pushed out the dipstick tube, then you have bad blowby. I had a 351W Ford in an old Mercury that did that and I still drove it for a year and a half like that (sometimes at a buck thirty down the interstate, on bald tires, without wearing a seatbelt-I did some dumb stuff when I was younger).
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  #12  
Old 05-15-2011, 07:45 AM
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Quote:
Originally Posted by Skippy View Post
When there is so much pressure in the crankcase that oil gets pushed out the dipstick tube, then you have bad blowby.
Heh heh. I had a Volvo 740 Turbo with nearly 400,000 kms that picked up for $350. That poor car had so much excess pressure in the crankcase it was like playing little dutch boy with finger in the dam to keep the oil inside and if you let it idle for more than two minutes the leakage by the valve seals started to produce a nice blue cloud out the back.

Someone told me that Mobil 1 actually reduces leakage and smoking and that car was testament to the validity of that claim. Everyone thought I was nuts pouring synthetic into a beater with piston slap, but it did the job better than the snake oil 'no smoke' junk.

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2002 e320 4matic estate│1985 300d│1980 300td
Previous: 1979 & 1982 & 1983 300sd │ 1982 240d

“Let's take a drive into the middle of nowhere with a packet of Marlboro lights and talk about our lives.” ― Joseph Heller, Catch-22
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