JoelP
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| posted on 18/11/05 at 09:48 PM |
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oil pissing out of the breather, xflow
hi guys. A small but rather annoying problem with my crossflow. Its 1640cc on twin carbs, pretty standard apart from that.
Reving it at a standstill does nothing, but after a bit of hard driving, there is oil running everywhere under the bonnet. Its coming from the
breather, i know cos i stuffed a rag in and it was absolutely soaking after about 10 mins. Nearly got me chucked off track (literally, i was on the
tannoy!  )
So, what could cause this? i lost a hell of a lot of oil in just a few hours (from 3/4 on the dipstick to nearly nothing). Main problem is the
mess.
Im thinking a catch tank would solve this, but surely theres no reason for all this oil coming out? Something blocked? too much oil? Wrong
dipstick?
There is also a small amount of smoke from the breather, would this indicate worn rings?
Any help appreciated 
Beware! Bourettes is binfectious.
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MkIndy7
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| posted on 18/11/05 at 09:53 PM |
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Did the original carb connect to the breather and suck the oily fumes back into the inlet?
The pinto's have a 1way valve in the breather that only opens when it is sucked open by the carb,
we didn't realise this and oil was even coming out of the filler cap.
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Peteff
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| posted on 18/11/05 at 09:57 PM |
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Does it have a vented filler cap Joel ?
yours, Pete
I went into the RSPCA office the other day. It was so small you could hardly swing a cat in there.
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rusty nuts
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| posted on 18/11/05 at 09:59 PM |
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Sure this has been covered recently. Worth a search?
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mookaloid
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| posted on 18/11/05 at 10:04 PM |
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Hi Joel,
Have a read of this
http://hometown.aol.com/sarandrews/wateroil.htm
I know Dave is talking about a Pinto but I think that the principle is similar
Cheers
Mark
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JoelP
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| posted on 18/11/05 at 10:16 PM |
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it does sound likely that it should be connected to the carbs, but it would still run out of oil every 2 days! cant work it out myself. Rusty, i dont
recall it being discussed recently, do you remember any threads? there are no obvious keywords to search for
Beware! Bourettes is binfectious.
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MkIndy7
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| posted on 18/11/05 at 10:19 PM |
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Naah when its working properly its only the oil vapour that gets sucked into the carb.
When the crankcase etc get pressurised because of insufficient breathing thats when it spits out liquid oil
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Mark Allanson
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| posted on 18/11/05 at 10:21 PM |
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quote:
Originally posted by Peteff
Does it have a vented filler cap Joel ?
Just what I was going to say, they usually have a wire wool plug inside the oil filler cap, and is down for replacement on every service - or oil
pisses out of the crankcase breather
If you can keep you head, whilst all others around you are losing theirs, you are not fully aware of the situation
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David Jenkins
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| posted on 18/11/05 at 10:25 PM |
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Go back about 8" from the dizzy - there is normally a little rectangular box with a pipe going to the inlet manifold. This is the normal type
of x-flow crankcase vent.
If the hole in the block has been plugged up then that's the source of your troubles. Either get a replacement valve box from the scrappy, or
buy a racing-style vent that has a pipe to a catch tank.
Someone else had the same problem a while ago - he found that the vent hole had been plugged with a bit of wooden dowel!
rgds,
David
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darrensdad
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| posted on 18/11/05 at 10:27 PM |
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had the same problem with my 1700 xflow.assumed it was down to leakage past the rings and crank case being pressurised . fitted largest diameter pipe
from side of block using a burton power adapter ,then into side of rocker cover .this re-cycled the oil back into the engine , fumes were the tapped
off from the other end of the rocker cover into a catch tank.
also check you have not over filled with oil ,this could end up being forced out by crank rotation.
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darrensdad
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| posted on 18/11/05 at 10:32 PM |
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forgot to mention ,i also unvented the rocker cover cap , cos it was pissing out of there as well ,fitted a self tapper in the one milli hole .
the engine is well worn i think ,but still goes well .
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raccoonradar
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| posted on 18/11/05 at 10:33 PM |
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Mine's same but not as bad
Its fitted with some kind of filter (on top of the breather pipe) vented to atmosphere, which is ok but good hard drive & you have instant rust
proof to the enigne bay. Was thinking of re routing the pipe near to the air filter or would this give me probs with the carb then ?
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darrensdad
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| posted on 18/11/05 at 10:41 PM |
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not good if the carbs take in too much oil ,with over enrich the mixture and soot up the plugs. mine has twin 40 webers which were never intended to
take in and re-cycle engine fumes .
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Chippy
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| posted on 18/11/05 at 10:45 PM |
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Sounds a bit more than breather problems to me, definately has the sound of broken, or seized piston rings, or really badly worn bores. Have you done
a compresion test on it. If it was mine that would my first check. IMHO.
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Fozzie
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| posted on 19/11/05 at 12:53 AM |
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Joel..U2U sent.....
Fozzie
'Racing is Life!...anything before or after is just waiting'....Steve McQueen
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Markp
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| posted on 19/11/05 at 08:19 AM |
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I had this problem and tried all the advise given, (different ways of plumbing the breather/catch tank etc)
In the end I got so fed up I swapped the block. All ok after that
But as you said, it's not so bad it just the mess!!!
Mark
[Edited on 19/11/05 by Markp]
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JoelP
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| posted on 19/11/05 at 08:32 AM |
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cheers all, will sort through posts tonight (im off to work now ), and maybe add a few pictures.
To summarize briefly, i have a small 1mm hole in the oil cap, the block breater behind the carbs just had a wire filter stuck in it, and this is where
it all comes from.
cheers!
Beware! Bourettes is binfectious.
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viatron
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| posted on 19/11/05 at 06:10 PM |
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Just started the new engine on the caterost, old one had excatly this issue and it had a seized ring, pressurised the crank and push oil out into the
catch tank as quick as it could go in!! Newly rebuilt engine now is fine, think its time for a rebore mate.
Mac
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JoelP
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| posted on 19/11/05 at 06:44 PM |
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1660ccs calling... its either that or approx 899cc
Beware! Bourettes is binfectious.
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DarrenW
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| posted on 20/11/05 at 12:56 AM |
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quote:
Originally posted by darrensdad
not good if the carbs take in too much oil ,with over enrich the mixture and soot up the plugs. mine has twin 40 webers which were never intended to
take in and re-cycle engine fumes .
I think i know this chap! Welcome to the nuthouse! Worth following advice - result of few months of hassle. Learnt the hard way.
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Baldrick
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| posted on 20/11/05 at 08:51 AM |
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Totally agree. Worn/siezed/knackered rings allowing pressure into the sump. My old 1300 sufferes from this but a) it's not really bad enough
to do anything about it (yet), b) I don't see any point in spending out to rebuild the 1300 and c) I know I need to replace the engine but cant
decide to go for the easy option (1600 xflow) or something else (?)
Incidentally, blocking it up to stop it being ejected will just lead to other problems because it will get out somehow.
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DEAN C.
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| posted on 20/11/05 at 04:59 PM |
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Jools,pick up a second hand MR2 lump and adaptor for the ford box,same size/weight engine but will leave a tuned crossflow for dead for a few hundred
quid.
C'mon Jools you know you feel the need for SPEED!
Once I've finished a project why do I start another?
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