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Hi all, got the new engine fitted, which is excellent. Thanks Rob. Got an oil leak problem. Its not major, little drop,on the dip stick however I get a fine mist which sprays onto the exhaust, after 30 miles its a mess. The engine is new, only done 700 miles, so possibly the rings aren't fully bedded in , so maybe a bit of crankcase pressure?
As best I can determine my oil leak is coming from the crank housing, through the pulley which in turn sprays the oil across the back of the engine and onto the exhaust. The only breather I have is a 5/8" hose running from the oil filler via 14" hose to a vw flapper valve. Any thoughts on improvement?
You can see the braided hose running down, it's the one with red/blue fitting just below the oil filler.
Any ideas, thoughts appreciated.
Paul
Seem to remember you had pulley leak issues before did you get the scroll grooves sorted. The general consensus seems to be any motor built to rev higher and or larger than 1600 requires extra breathing although vw did 2L aircooleds with just one breather pipe.
Snoopy,
No not got the oil leak sorted from the cran pulley. Actually I refitted an original VW pulley, actually mde things worse. Not sure where I a pull extra breathing from. Still on a mechanical pump, so not there, what about tapping into the rocker covers, then into a catch pot etc. Need to do sometime , Im pretty sure the crankshaft pulley area is the source of th leak.
Paul
tapping into the rocker boxes is easiest and put the hoses up into a catch tank. I assume your rubber vent valve is soft so it opens up with a little pressure rather than slow/hard to open retaining pressure.
I don't know what you've done already to check why the case is overpressurised, have you done a compression or leakdown test at the cylinders? Is there evidence of overpressure at the oil filler, can you feel excessive pressure with the engine running with the cap off?
If it's only coming out at the rear seal, it may not be overpressure that's causing it. Best to check before you start spending time and money.
I'm still running a mechanical pump on my heritage (SSP) 1776. And yes they strongly (very strongly!) recommend additional breathing. I have now ported the stainless steel clip on covers to the CB performance oil filler catch tank. Seems to work just fine. (if you run my engine with the oil filler port open you can feel quite a bit of air flow coming from the case so yes you really must breath it.
(http://i1135.photobucket.com/albums/m625/print465/IMG_4521_zpsapehlgmu.jpg)
Funnily enough mine has recently started to leak a small amount from the pulley too with a very very minor bit of end float - so its engine out and shimming the crank time over the winter (not overly too worried yet). ;-)up
If you fit a catch tank.Make sure one pipe goes to your carb/ carbs, as this will help create a negative pressure in the crank case and help prevent oil leaks or blown seals. It will draw the air and oil mist in to the tank. Get some wire wool and put that in the catch tank so the oil mist hits that and reduces it being drawn in to the carb/s and affecting your air fuel mix.
Paul
What's this flapper valve? Take it off and run the shortest pipe you can to the bottom of the engine level and see if it is any better ;-)up
Rob
Thanks for all sound advice. Rob, the flapper valve is a vw item , just a piece of rubber with a restriction intended to allow fluids out but nothing in. Yes I will remove the flapper and try with just the open hose, makes sense to try the simple stuff first. The oil leak looks worse because it falls onto the exhaust and makes such a mess. How can feed a line into my carbs ; Solexes?
Don't believe there is anything wrong with my engine, just an annoying oil leak.
I'll keep trying, like Mike says, enjoying our buggies is the main thing.
Thanks.
The Jas breathers just go up to a catch tank that vents to atmosphere the original beetle design went back into the oil bath so any mist was absorbed into the oil in the air cleaner.
Snoopy, when to mention breathers where are they from, I only have the oil filler kneck. My rocker covers are pressed stainless steel, not sure about drilling these.
Paul
Quote from: pepsi81 on October 16, 2015, 08:30:49 PM
My rocker covers are pressed stainless steel, not sure about drilling these.
So were mine (Scat stainless steel clip on ones) - but they are fine. Drill a smaller hole to begin with and then one just enough to get the fitting through. I thought I might have to weld them to seal them in but have been fine with a little bit of gasket sealant around them. Just make sure you use the CB performance fittings. DONT TOUCH the EMPI ones!
Shaggy's suggestion about feeding the pipe to the carb is a logical one and some do it just fine. Personally I found due to the air flow, my carbs ran terrible by doing that so I chose against it - its personal choice.
Likewise with the wire wool - again, many do it just fine - for the reasons he mentioned. So far I haven't needed that and I guess I would be concerned about the potential risk of some falling down into the case via the oil filler. (Of course thats only a risk if you have the breather tower like mine. If you have the separate breather box then its not a issue IMHO)
Don't just leave the 1 way valve off as it stops the breather sucking rain water on over run, it sounds like you have a mayo problem in the pipe or filler neck.
That may be the case , as a lot of my,run are less than 20 miles. Not t seen any evidence at the filler cap?
If my crankcase isn't over pressurising and I do have a leak from the crankcase pulley ( not certain), what else can it be ?
Have you forgotten that it's a Volkswagen ;D ;D ;D ;D ;D There was a sticker available " Original Oil Dripper" say no more ;-)up
They mark their spot when parked as Hudge says. All you have is a oil throw dished washer and the scroll on the pulley there is no actual seal just a small gap.
;D
Don't mind the oil, just keep cleaning the exhaust ;-)up
No problem with engine breathing here.....taken at a mates workshop this morning.
https://www.youtube.com/watch?v=fHKIA6Rd7JU
Remade my oil lines to the remote filter. Seems tomhave cured the problem, at the moment ;-)up
Paul
you say its leaking out the crankcase pulley ? . There should be a throw washer behind the front pulley to stop oil from leaking out the front pulley.
take the pulley out and see if its there.
its item 3
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Yes Grissley, thenthrow washer is there. Checked and remade my remote filter hoses, this seems to have cured my issue at the moment. Can't be sure by the effect of an oil leak near the crankpulley may have masked the source of the leak. Spent weeks on this, nver been certain exactly where my leak was from!
Thanks for your suggestion.
Paul
Grissley, P.S. good to have you back. ;-)up
are you aware that some pulleys are smaller dia where it fits in the case hole. ;-)up
I wasn't but thanks.
What angle is your filter at?
If it is vertical so there is no chance of air in there then my theory is pants, but if it is sitting at an angle there could be an air bubble in it, this would compress when there is oil pressure and when you switch off then it would continue to push oil forwards or back until the pressure is released putting slight pressure on the case with the thrower thread not spinning.
Might be a daft idea but that is the best I have for why playing with the oil lines could make any difference
Pants.....
VW put them on sideways on the last Mexi bugs.
How about all the air in the crankcase.......?