Mystery Carb Modification?

[Multiphonikks]

It doesn't go to the air filter intake on this type, Nikki - cylindrical crankcase breather to carb

Doh! That's what I get for scan-reading a page after too much Pear Cider!

Hmmmmm Curry and Pear Cider!

[bigginger]

:) now *that's* proper Brissle eating, my babber...

a

[Multiphonikks]

... fankooo

[utilly]

I don't suppose anyone happens to have photo of what a 1970 carb, rocker cover, cylindrical crankcase breather, oilcap, garden hose, etc to hand to show me what it should look like?

Actually, that would be a useful addition for this website, don't you think? A series of shots of what an original engine should look like from different angles for each of the series.

I have a stack of about 6 manual here that I have been pouring through, but they all seem to share the same illustrations, show things from the wrong angle or just plain show the wrong version and just make passing reference to what came before/after. Argh...

regards

Tilly

[Willie]

TILLY......the 'Green' pipe (which should be a nice black rubber type)
on your car is letting air out via the AIR FILTER but not nearly as
much as it should do if it were connected correctly to the tube on
the CARB. The suction on the CARB connection is quite considerable
each time the throttle is closed. Some people modified their engines
by reverting to the earlier breathing system but since you still have
the pipe fitting on your CARB then it appears original (this type of
late carb is not suitable for the earlier 1098's). If you remove the
green pipe from the air filter it will have no ill effects. Your shopping
list should be: A new OIL FILLER CAP with wire mesh filter in it.
TO LET AIR IN, that's why it has a filter,to clean the air going IN.
A length of suitable pipe to connect from your tappet chest cylindrical
outlet to the stub on the CARB...to let air OUT which is then sucked into the engine and burnt giving less pollution, or so the theory went!
It is worth checking the state of your air filter and the casing where
it sits because you will probably find oil there.

[utilly]

Shopping list:
-Oil filler cap (with mesh filter)
-Carburettor To Engine Breather Tube (or cheap generic length of rubber hose and jubilee clip for the smaller carb breather end - 9.45 for a rubber tube? Outrage!)

- And seeing that she is throwing petrol from the float tank again, it wan't just a case of cack in there, the needle valve might be worn. ::sigh:: What would be the proper name of the thing that I am looking to replace in here? Is it a 'Needle & Seat', or something entirely different?

Also, would it be worth fitting a Fuel Line Filter to fit between the pump & carburettor, just incase the recent work Dad had done on the fuel system (new fuel pump) has dislodged more cack and I will have the same thing happen again?

thanks

Tonia

[Kevin]

would it be worth fitting a Fuel Line Filter to fit between the pump & carburettor,

It wont do any harm and if you use the see through type you will be able to see whats happening.

[Willie]

Tilly...yes you need a 'needle and seating ' for the leaking float
chamber. The only awkward bit is undoing the original seating
nut which is recessed and really requires a box spanner. You
will probably find a wear ridge on the old needle, do not fit a new
needle on its own. This is assuming that the leak is from the TOP
of the float chamber. If it is from the bottom then the feed pipe
to the jet needs tightening.

[utilly]

This is assuming that the leak is from the TOP
of the float chamber.

Thanks Willie, I'm not assuming here, I have seen it flooding out of the top!

[chickenjohn]

Like the original owner of the car in this thread, i had to remove the breather system from my car because air leaks caused the mixture to run weak.

My 1969 traveller had the "trumpet" arrangement- where the device fed breather fumes into the inlet manifold (after the carb).

The problem was the rubber membrane was knackered and leaking, so thinking that such obscure parts would not be available, i too it off and blanked the pipe with rubber tubing and a bolt, jubilee clip.

I was delighted to discover yesterday that ESM stock these emission control device diaphragms! (as is the proper term.)

http://shop.morrisminorspares.co.uk/ind ... 038ad6245d



Just so people know that even breather system parts are now becoming available![/i]

[lowedb]

The fuel pumps usually have a mesh filter in. Check this isn't missing / removed. I had a 'bike once that intermittently flooded out of the float chamber because of paint flakes! In line fiter cured it becasue the tank filter was missing.

You used to be able to get needles with 'viton' tips which were flexible and would seal even on worn needle seats. Anyone come across these recently?

[Willie]

JOHN...amazing that they are still obtainable! I thought ALL owners
had either reverted to the earlier breathing systems or the later
systems because of the potential fault liabilities of the'mushroom'
type breather. Hope you bought several!!

[utilly]

The fuel pumps usually have a mesh filter in. Check this isn't missing / removed.

My Dad had the fuel pump replaced recently. Now he rates the mechanics that worked on her, but I'm having my doubts with the whole garden hose to air filter modification.

I got a package in the mail today from Bull Motif that included a new length of pipe, needle and seat (dad claims that his mechanics put a 'nearly new' one in the float chamber in 1996 just after he bought Gladys), oil filler cap with wire mesh filter and inline fuel filter, just in case...

Now my biggest challenge to see if the local car bits shop is open on Good Friday so I can get a couple of jubilee clips for aforementioned pipe.

[Multiphonikks]

Tilly, love the picture of Gladys!

Sigh... It seems as if I should get a four door - otherwise I'm going to be left out

[bigginger]

Nah - always stick with the one other people don't like,,, ;)

[utilly]

Tilly, love the picture of Gladys!

Thanks, isn't she a dish? Mind you, white cars aren't easy to photograph with digital camera. The default seems to be to over expose... good job I have trees in the back yard.

Any-hoo, I lucked out on Friday and managed to get hold of a couple of jubilee clips.

Then, I fixed my car! (ok, maybe not a big thing for a lot of you on the list , but it was a first time for me. You know, actually *replacing* a part, rather than just poking at it and then booking it into a garage or calling out the RAC, so, WHOOOO - HOOOO!)

The needle was warn, which accounts for the horrid behaviour on the jorney back from the valleys and the petrol pouring out of the float tank.

In other news... The oil filler cap with filter and pipe from carb to the cylindrical thingie is now in place.

The combination seems to be working for her. When I took her out to Carmarthen today, she flew... up to somewhere in the region of 65 - 75mph (well, the needle is a little 'vague').

And when she was home, there was no longer the struggle to get the oil filler cap off, and no mayo.

I would like to thank everyone for their helpful suggestions and encouragement. I am now hoping that the 'anti-honeymoon' is over and the relationship can begin.....

Now, rust... How much is too much and where? Discuss.

[bigginger]

Congratulations! Where did you get the mesh filler cap - you've inspired me to restore that system on the new pick up, seeing as it has the same carb mod - bolt, jubilee clip and everything. I'll have to either find a new cylindrical thingie or take the one off the engine I'm rebuilding, which would be another handy excuse for not finishing it, as if a snapped head stud wasn't good enough....

[utilly]

The filler cap was about a fiver from Bull Motif who were a pleasure to deal with.

Tilly

[bigginger]

Ahh, excellent - thank you!

[Cam]

Now, rust... How much is too much and where? Discuss.

Technically, ANY is too much and should be removed before it spreads.

Mind you, the MoT man will let you know if you have too much in the wrong places!