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Blowby - is this okay?
by
Brianshayne
on 25 Jul, 2013 09:56
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After most drives, I need to reseat my dipstick -- about an inch and a half or so.
Is this okay? Could my leaky valve cover gasket be causing this? (Sucking in air?) Also, notice not so much steam -- maybe smoke? Something wispy that comes off the valve cover gasket area while running.
Temps are good, coolant level is good.
Unrelated: Tried upping my fuel -- got it up, wasn't sure what kind of smoke SHOULD be present, and no EGT so I chickened out and turned it back down.
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#1
by
CRSMP5
on 25 Jul, 2013 10:19
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when it runs away its too much blow-by...
vc leaks due to the same reason dip stick pushes out... honestly...
i would add a catch can that has a return into the block via the plate by the vac pump.. so any oil it blows out will drain back in once off.. and run it till you can rebuild..
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#2
by
libbydiesel
on 25 Jul, 2013 10:23
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If a catch can is added with a return to the block it must have a check valve in the drain or it increases the risk of runaway.
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#3
by
burn_your_money
on 25 Jul, 2013 11:45
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A leak in the vacuum system can cause extra air to enter into the engine. I'd investigate that. Thankfully it's not a MB so it won't take very long
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#4
by
damac
on 25 Jul, 2013 12:36
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I think I have been lucky thus far, even my nastiest used engines I have come across that had blowby out the filler cap, never pushed the dipstick out.
My 85 jetta came with an engine that had a good amount of blowby and I made a catch can out of pvc and stainless steel mesh balls stuff inside. I could easily breath through it so it wasn't restrictive, and in the middle cavity I put a hose that goes to the old block off plate location.
I think it did help a bit as far as going into the end of the intake.
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#5
by
CRSMP5
on 25 Jul, 2013 14:06
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ive seen them push oil up out of the dipstick... not like watergun.. that be sweet though.. but enough for the customer to *** abt the oil drops on the ground.....
libby.. at the point of time ive seen people build a catch can like that.. it was no longer fed into the intake... they were using it as a way to catch the oil to let it run back in... and sadly it worked for them... old cheap 1.5d users of the 80s...
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#6
by
Brianshayne
on 25 Jul, 2013 16:27
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I understood about zero of this thread so far, sorry guys -- slower maybe, I'm still pretty dumb.
No oil out the dipstick -- some wispy from the valve cover (as it's leaking) only saw this once though, on a dry day.
No PCV on this motor? So catch can eh? How would I tell if it has one? Motor is stock at the moment, minus a very smallly adjusted fuel screw (was blowing vefore though)
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#7
by
CRSMP5
on 25 Jul, 2013 16:55
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pvc built into the vc... never seen diesel one plug up...
no oil.. do not worry bout it.. i bet your dipstick has a vibration and it poppig up due to that...
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#8
by
Brianshayne
on 25 Jul, 2013 17:00
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Oil filler is under pressure when you remove the cap -- normal too?
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#9
by
burn_your_money
on 25 Jul, 2013 18:22
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On a running engine, very normal to have pressure under the oil filler.
I'm 30 minutes from you. If you want to swing by some time I can have a look at it and tell you what I think.
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#10
by
air-cooled or diesel
on 26 Jul, 2013 07:36
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A leak in the vacuum system can cause extra air to enter into the engine. I'd investigate that.
this is the first thing to do. check all vac lines/connections, and brake booster for rust holes/leaks.
simple, effective step to knock off to check list.
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#11
by
air-cooled or diesel
on 26 Jul, 2013 07:43
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On a running engine, very normal to have pressure under the oil filler.
I'm 30 minutes from you. If you want to swing by some time I can have a look at it and tell you what I think.
Oil filler is under pressure when you remove the cap -- normal too?
as long as oil isn't getting pushed out thru dipstick or valve cover area; which would indicate way over pressure inside. some pressure and pulsing is normal.
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#12
by
Brianshayne
on 26 Jul, 2013 09:50
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If you'd be down, that'd be great. Once I learn, I learn - but I'm better visually. Maybe you can show me how to reattach my residual screw as well, seems to have come out
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