FASTdan
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| posted on 8/6/09 at 07:40 AM |
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Pinto breathing - cap?
It seems that when you rag our pinto it is blowing oil out of the filler cap breather holes - its a universal item with wire wool stuffed into it. I
think this may be because we dont have a breather off the rocker cover?
Question is, will one of the caps with the breather pipe outlet included fit under the bonnet? That is the reason i didnt get that type in the first
place. it is located at the back of the engine - modified rocker cover.
Also, can anyone tell me what the dia of the cap needs to be? I forgot to measure it but could do with picking one up tonight on my way home from
work.
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DarrenW
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| posted on 8/6/09 at 08:17 AM |
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2 things to look at.
1. You have modded the rocker cover to moive the filler to the back. Is there a baffle plate on the inside? if not it is poss that the oil that is
being flung around inside might have an easy path out. Im not sure if other people have fitted a baffle when moving the filler location, but seem to
recall that the std postion has a baffle.
2. Its worth trying a cap with breather hole. I have one piped to catch tank. I know other people with the same. You will probs find one in Halfords
for only a few £'s so worth a try.
those are the simple bits. Pinto's seem to breath better when the crankcase and top end are both vented. Or at least mine does and some others
ive seen. The only other check to do if that doesnt solve it is oil level. I fell foul (big style) of an incorrect dipstick. All sorts of strange
happenings that all came good when oil level was corrected. Modded sumps dont change the oil level you need, it only affects the capacity. Some
Pinto's with correct dipstick and tube breath heavily when oil is at top mark, however run sweet when oil level is about halfway. If you want to
check the measurements (and i advise you do 1 and 2 first) then do a search for some of my posts about 2 years ago. I cant stress enough though - keep
it simple at first. Your problem will probs be easy to solve cheaply.
What crankcase breather arrangement do you have? A pic may be useful.
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Mr Whippy
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| posted on 8/6/09 at 08:34 AM |
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as above, my pinto didn't have a plate under the filler cap and so at high rpm's the camshaft threw around so much oil the cap would spill
out out the vent all over the rocker cover.
I simply welded a small plate inside, about 50mm x 60mm under the cap with enough of a gap at the sides for the oil to be put into the engine and that
was the end of that problem
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nick205
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| posted on 8/6/09 at 08:40 AM |
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Common issue with a rear filler cap set-up. When you boot it all the oil in the head is going to slosh towards the back (where the drain hole is
incidentally) and up the filler neck. A longer filler neck and internal baffle will both help with this as will fitting one of the yellow filler caps
with a breather take off (1/2 or 5/8" hose IIRC) plumbed to a catch tank.
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FASTdan
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| posted on 8/6/09 at 09:28 AM |
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thanks for the responses guys. funnily enough i'd wondered about the oil level, as it is currently topped right up, possibly a bit too high -
and this problem has only just started happening. what actually happens, the level is too high to allow oil to drain back to the sump properly?
Also it does not have a baffle so this wont be helping. Whippy - when you say you welded a baffle in, was this actually 'in' the filler
neck, or below?
The current breather set up is minimal - simply a pipe connected to the block breather (under carbs) running direct to a catch tank (with breather
filter).
Anyone know that dia off the top of their head?
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scoop
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| posted on 8/6/09 at 09:48 AM |
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Had a similar problem recently so went to Halfords got a yellow cap for £3.99 and will be connecting this and the crank case breather to catch tank as
soon as it gets here. My oil filler has been moved to the back of the cover but put on a 90 degree bend to avoid the oil problem.
Steve
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Mr Whippy
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| posted on 8/6/09 at 11:09 AM |
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quote:
Originally posted by FASTdan
Also it does not have a baffle so this wont be helping. Whippy - when you say you welded a baffle in, was this actually 'in' the filler
neck, or below?
below, inside the rocker cover, bent slightly to follow the inner curve of the cover but still leave a gap either side of the plate to let the oil be
poured into the engine
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DarrenW
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| posted on 8/6/09 at 12:03 PM |
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quote:
Originally posted by FASTdan
The current breather set up is minimal - simply a pipe connected to the block breather (under carbs) running direct to a catch tank (with breather
filter).
In theory this will work as long as you dont have the original PCV in plave. This valve only opens when connected to the original carbs (low running
vacuum opens it). When running to a catch tank you either need to replace it or remove the ball and spring bit. Even if you remove the ball and spring
part of the valve you can find the outlet diameter is a bit restrictive. I pulled the full PCV valve and replaced with cortina style trap. Others have
replaced with a fitting from Burtons or made their own.
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FASTdan
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| posted on 8/6/09 at 03:53 PM |
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quote:
Originally posted by DarrenW
quote:
Originally posted by FASTdan
The current breather set up is minimal - simply a pipe connected to the block breather (under carbs) running direct to a catch tank (with breather
filter).
In theory this will work as long as you dont have the original PCV in plave. This valve only opens when connected to the original carbs (low running
vacuum opens it). When running to a catch tank you either need to replace it or remove the ball and spring bit. Even if you remove the ball and spring
part of the valve you can find the outlet diameter is a bit restrictive. I pulled the full PCV valve and replaced with cortina style trap. Others have
replaced with a fitting from Burtons or made their own.
Yeah we pulled that lot out and made a fitting to suit.
Think I'll drain a bit of oil, plumb a proper cap in and see how it goes. If that doesnt cure it I'll do a baffle.
Thanks for the info guys 
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NOTE:This user is registered as a LocostBuilders trader and may offer commercial services to other users
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goaty
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| posted on 8/6/09 at 06:16 PM |
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i had to modify the halfrauds cap with the take off so it would squeeze under the bonnet (inverted the top and sank the internals further in). Nothing
a bit of superglue cant help with
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