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XPEG crankcase vent

Posted by joegyoung

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XPEG crankcase vent #1
joegyoung Joe Young Asheville NC, USA 1949 MG Y-Type 1955 MG TF 1500 1959 MG MGA 1600 1968 International Binder 1973 MG MGB GT → more	Posted: March 15, 2012 08:57PM Registered: 1 year ago Posts: 20

I have a question that is not addressed in the searching but surely someone must know. My new to me 1500 XPEG engine that ran fine >34 MPG, on the drive home seems to be designed with no road tube for the crankcase vent. THe vent has a very nice pice of casting with the MG crest on it, but just blows the vent gas all over the lower side of the engine. After a long drive this results in a real mess. IS this the original design? There must be some way to trap the oil mist that will come out in any engine. Or is there a part missing? I took off the nice cast cover plate and there is just a rectangular whole behind it. ANyone who has an XPEG must have this problem unless I am missing something.

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Re: XPEG crankcase vent #2
ddubois Dave DuBois Bremerton, WA, USA	Posted: March 15, 2012 09:21PM Registered: 7 years ago Posts: 4,289

Joe - No, the tappet chest cover that you have is an after market style, the original has a pipe extending down under the car. LaVerne Downey had a recent thread on this or the MG Cars Enthusiasts' Club t series TD-TF bulletin board recently detailing how he cured the same problem on his car. Stay tuned and I'm sure that LaVerne will chime in on what he did.
Cheers,

Dave DuBois
1953 MGTD
1966 MGB
http://homepages.donobi.net/sufuelpumps/

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Re: XPEG crankcase vent #3
LaVerne LaVerne Downey Colorado, USA 1952 MG TD "Black Bitch" 1954 MG TF "Green Hornet" 1969 MG MGB	Posted: March 15, 2012 10:54PM Registered: 5 years ago Posts: 4,332

Rather than rewrite it Joe, just use this link. If you have any questions just holler and I'll try and answer them.

http://www2.mgcars.org.uk/cgi-bin/gen5?runprog=mgbbs&mode=thread&access=51630166407095&subject=8&source=T&thread=2012030916584910820

This site is THE place for all things MG TD/TF and it's Free!!

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Re: XPEG crankcase vent #4
ddubois Dave DuBois Bremerton, WA, USA	Posted: March 15, 2012 11:30PM Registered: 7 years ago Posts: 4,289

Sure glad you stopped by LaVerne, I tried to find you thread on the MG Enthusiasts' for Joe, but couldn't find it to save my soul. Of course I'm getting to the age that it could have been a year ago and I think that it was yesterday.
Cheers,

Dave DuBois
1953 MGTD
1966 MGB
http://homepages.donobi.net/sufuelpumps/

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Re: XPEG crankcase vent #5
Paul J Paul Jennings Locust Grove, Oklahoma, USA 1955 MG TF 1500	Posted: March 16, 2012 04:54AM Registered: 6 years ago Posts: 2,851

A stock vent.

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Re: XPEG crankcase vent #6
joegyoung Joe Young Asheville NC, USA 1949 MG Y-Type 1955 MG TF 1500 1959 MG MGA 1600 1968 International Binder 1973 MG MGB GT → more	Posted: March 16, 2012 06:12AM Registered: 1 year ago Posts: 20

Thanks so much for all the help. I understand the issues now and think I can design a gasket and vent trap to greatly reduce the oil coming out. I think I try both approaches. I like cutting gaskets as it takes me back 45 years to time spent on the valve bench in the repair shop of a Navy destroyer. I guess I should have searched for 'push rod cover' in stead of crankcase vent. My cover is a little different than the others as it only has one vent slot. Who would think they made so many. I'll take pictures and post.

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Re: XPEG crankcase vent #7
Paul J Paul Jennings Locust Grove, Oklahoma, USA 1955 MG TF 1500	Posted: March 16, 2012 07:54AM Registered: 6 years ago Posts: 2,851

Like anything else Joe, these polished pieces were made by after market company's and even though they really pretty up an engine, some were poorly designed and don't function as expected. Hopefully the gasket trick will solve your problem. Keep us posted of the outcome. PJ

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Re: XPEG crankcase vent #8
LaVerne LaVerne Downey Colorado, USA 1952 MG TD "Black Bitch" 1954 MG TF "Green Hornet" 1969 MG MGB	Posted: March 16, 2012 09:43AM Registered: 5 years ago Posts: 4,332

I can relate to that Dave. I can't remember what I had for breakfast....or even if I had breakfast. confused smiley

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Re: XPEG crankcase vent #9
joegyoung Joe Young Asheville NC, USA 1949 MG Y-Type 1955 MG TF 1500 1959 MG MGA 1600 1968 International Binder 1973 MG MGB GT → more	Posted: March 21, 2012 06:47AM Registered: 1 year ago Posts: 20

I pulled the cover and there was a gasket behind but it was in fairly bad shape. I did notice that the three sex-bolt studs that hold the cover were just figure tight which contributed to the leak at the bottom I'm sure. Cut a new gasket and things seem good. I also took the opportunity to put the distributor back in so that you can open and close the clips without removing the tachometer drive cable. Car runs a little better it seems but that may just be the 'I worked on it so I think it is better' effect. Thanks for the help.

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Re: XPEG crankcase vent #10
mdale8 Mike Dale Fond du Lac, Wisconsin, USA	Posted: April 29, 2012 01:28PM Registered: 2 years ago Posts: 5

I could use some similar help. I tried to go to the link as referenced by Laverne, but it goes to a page that says The Link has been disabled.

The problem my friend has with his 55 TF 1500 is that while it was rebuilt and runs fine, he loses a quart of oil every 25 miles through that pipe that comes out of the side of the engine. It is not coming from the road draft tube but rather from the line that should be an air input, via the air filter from the carburetor into the side of the engine. I understand that this is makeup air for the road draft tube. The funny thing is, this is a good running engine, and a fresh one at that. One theory is that we have too much oil at the top of the engine and it cannot drain to the bottom fast enough. We would really appreciate any suggestions

Mike Dale

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Re: XPEG crankcase vent #11
ddubois Dave DuBois Bremerton, WA, USA	Posted: April 29, 2012 02:20PM Registered: 7 years ago Posts: 4,289

"...from the line that should be an air input, via the air filter from the carburetor into the side of the engine."

Mike - The line going to the carburetor should not be coming from the side of the engine, but rather from the top of the rocker cover. This line is meant to scavenge fumes from the engine when the car is not moving and at idle. As for too much oil at the top of the head, while there is a lot of oil being squirted out of the rockers, there are 8 rather large holes where the push rods come up from the tappet chest for the oil to drain back into the crankcase that should handle the volume of oil quite nicely as long as there is a baffle over the tube in the rocker cover to prevent any oil from being squirted directly into the tube.

"I tried to go to the link as referenced by Laverne, but it goes to a page that says The Link has been disabled."

Try this link (you may have to copy and past it) - it takes you to the archives. http://www2.mgcars.org.uk/cgi-bin/gen5?runprog=mgbbs&access=10172333602073&mode=archiveth&subject=8&subjectar=8&thread=2012030916584910820
Cheers - Dave

Dave DuBois
1953 MGTD
1966 MGB
http://homepages.donobi.net/sufuelpumps/

Edited 2 time(s). Last edit at 04/29/2012 02:48PM by ddubois.

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SU Fuel Pumps & More SU fuel pump restoration and conversion to solid state. Information and technical articles on SU fuel pumps.

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