Hey Team!!

I've been out for a while but I am back!! The 240 is/was running excellently.. I recenty replaced the bearing on the A/c Clutch and filled her with 134 and oil and voila she is ice cold!! First time since i have had the car.. i have to tell you guys about my power steering belst situation that arose from that but that is for another time!! LOL
Anywho My blowby is so horrible that I am blowing oil from under the oil cap.. when ON!! also from the bolt that i believe is the "Thrust BOLT" under the 1st cylinder.. so I ordered the valve stem kit a few months ago in preperation for this..

Here are my two questions:

1: The kit didn't come with the protective sleves.. i'm thinking that a mcdonalds straw will work just to go over the threads on the valves.. what do you guys think?

2: how do you feel about cleaning the camshaft and head with brake parts cleaner? Will it mix with the oil and potentially break down the oil in the engine if some particles are left over? Or do you think that the mixture will evaporate enough that with a oil change afterwards that it will be ok?

3: Removing the rocker arms look easy enough, but what is the best way to ensure that the guides are down good if you don't have the little tool?

4: My seals have a little metal spring running around one end.. i would imagine that this is the upward pointing end.. correct?

I know that there were questions... They grew as I typed!!

Thanks Guys!!

Ron

Are you thinking that valve stem seals will solve the blowby problem? If so, they won't.

__________________
1977 300d 70k--sold 08
1985 300TD 185k+
1984 307d 126k--sold 8/03
1985 409d 65k--sold 06
1984 300SD 315k--daughter's car
1979 300SD 122k--sold 2/11
1999 Fuso FG Expedition Camper
1993 GMC Sierra 6.5 TD 4x4
1982 Bluebird Wanderlodge CAT 3208--Sold 2/13

I'm hoping it will buy me some time :-)

Won't make any difference at all with blowby. Give us an objective measure of your blowby. Either do the garbage bag test or post a video of the blowby so people can comment on its severity.

__________________
1977 300d 70k--sold 08
1985 300TD 185k+
1984 307d 126k--sold 8/03
1985 409d 65k--sold 06
1984 300SD 315k--daughter's car
1979 300SD 122k--sold 2/11
1999 Fuso FG Expedition Camper
1993 GMC Sierra 6.5 TD 4x4
1982 Bluebird Wanderlodge CAT 3208--Sold 2/13

Sounds Great.. i'll make one tomorrow :-)

If it is indeed blowby from wear, it's the rings that are tired and pressurizing the crankcase, not the oil possibly getting pulled in past the valve stem seals. Or it could just need a new oil cap gasket.

__________________
1985 300D-189k The 'UD', Ivory and Pinkamino
1979 300D-211k Dark Gray, Parchment
A 1980 Harley-~166k and
A 1994 Ford diesel pickup-349k and
A 1990 gasser Volvo wagon-145k

Crankcase vent clear? Since it is getting into spring going to straight 40 weight diesel oil will reduce the blowby usually.If you are or have been burning other than diesel fuel mention it.

True... I was pushing some out of the valve cover as well.. Also around that bold... No..only diesel.. The valves are extremely tight.. I have to adjust them.. That will make a difference too I'm sure..

Yeah it is def clear (crankcase vent)... Someone hadn't connected the line.. It was missing the length running from the lower portion to the intake.. It started slinging oil on the firewall.. So I connected it with some hose.. It smokes some on startup and clears alot once it is hot. I'll put it back together and rui it tomorrow and video it..

Where does your vent run from and to? Doesn't it go from the top of the valve cover directly into the intake or into the air cleaner?

__________________
1977 300d 70k--sold 08
1985 300TD 185k+
1984 307d 126k--sold 8/03
1985 409d 65k--sold 06
1984 300SD 315k--daughter's car
1979 300SD 122k--sold 2/11
1999 Fuso FG Expedition Camper
1993 GMC Sierra 6.5 TD 4x4
1982 Bluebird Wanderlodge CAT 3208--Sold 2/13

Maybe your seal on the oil filler cap is bad? Maybe the blow-by you are experience is normal but with a bad seal on the cap more oil is escaping?

How many miles are on this motor?

__________________
Cruise Control not working? Send me PM or email (jamesdean59@gmail.com). I might be able to help out.
Check here for compatibility, diagnostics, and availability!

(4/11/2020: Hi Everyone! I am still taking orders and replying to emails/PMs/etc, I appreciate your patience in these crazy times. Stay safe and healthy!)


82 300SD 145k
89 420SEL 210k
89 560SEL 118k
90 300SE 262k RIP 5/25/2010
90 560SEL 154k
91 300D 2.5 Turbo. 241k
93 190E 3.0 235k
93 300E 195k

The vent line goes from the valve cover to the an "L" shaped turn that ous fastened to a thin pipe.. About half the diameter of a pencil that runs from each of the intake manifold pairs. Then it goes into the air intake.. Not the cleaner but directly onto the intake..

I'm looking forward to your video - post it up!

__________________
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!

@Army.. You know I'll make a video complete with sidebars lol!

There is a very simple test for checking for excessive blowby in a diesel and I am surprised I have never seen it posted here.

Firstly a healthy diesel engine will always have a negative pressure in the crankcase if the breather is properly connected to the intake manifold without any leaks or blockages. The intake manifold has a significant vacuum that will be more than enough to scavenge the crankcase, unless there is extreme blowby, though nowhere near enough to operate brakes etc.

The way to check is as follows:

1) Check the hose from the valve cover to manifold has no leaks or blockages.

2) Remove the oil filler cap, wipe away oil and put thick grease around the hole.

3) Find a piece of thin polythene sheet (e.g. bag) and seal it around the hole with engine @ about 1000rpm. As you increase revs further the sheet should dish in indicating a negative pressure. Don’t expect anything dramatic! If you have positive pressure and the sheet blows off you are soon going to need a rebuild.

Where on earth did you get the idea that valve seals are causing your blow-by. Not here I would hope!

__________________
Beagle