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MG Midget and Sprite Technical - Oil seperator pip to carbs

What are the implications of removing/disconecting the pipe which runs from the oil seprator on the timing chain cover to the carbs?
G Lazarus

that's Pipe not pip!
G Lazarus

Lots of oil leaking from the rear main bearing scroll seal.
Dave O'Neill 2

Ah but I have a rivergate five speed box with a built in oil seal.
So assuming that I don't have oil running out the back of the engine, what are the implications.
G Lazarus

damage to the rivergate oil seal, as the oil is still going to get past the scrool seal and will be trapped ...thus building up and has to go someware...out the RG seal.

also a drop in oil pressure, and increased blow by if the engine has any kind of wear.

Vizard has a great idea to re-route the pipe thur a oneway valve and attach it to the exhauste pipe...as the rev. increase it creates more vacume and pulling the pressure out of the engine creating a negitive pressure then at low revs and idle the engine is running equal atmosphric pressures...(my interpertation from memory....so dont quote me....others with more in the know are welcome to correct me as always. Truth before Pride!)

prop
Prop

The crank vacuum (or lack thereof) will have no effect on the gearbox. Like Dave says, taking off the crank vent to the carb (where there's a vacuum) will allow copious amounts of engine oil to escape past the scroll at the rear of the crank, esp when the oil is hot.

This is a classic midget (owner) fault, and should be avoided, unless you want your car's journeys to be marked by a series of oil drips, and its resting places by black oily puddles...

Why do you want to remove this essential part of the engine's continence?

A
Anthony

Hey Anthony, Malvern,


What G Lazarus, is refering to on the gear box...is on the adaptor plate between the engine and tranny bell housing has a built in rear engine oil seal...basically a huge seal that rides agianst the flywheel chunk of the crankshaft and attaches to the adaptor plate...vary sismilar to the peter may rear oil seal.

prop
Prop

Thanks for the replies.
The reason for my question is that I discovered that the pipe was pretty much off at the oil separator end when I had a quick check over the weekend (it's now fixed). I was having a noticeable rise and drop in revs on tick over and assumed that that was the reason. However I didn't notice any change when driving. Anyone who has driven behind my car wouldn't notice any significant increase in blow-by as my very worn engine has been fumigating southern England quite happily for the last four years or so.
New engine being fitted in August. I thought I'd give the French countryside one more coating of 20/50 before then.
G Lazarus

thats called life time preservation of the exhaute pipe...lol

prop
Prop

keep the pipe Gary
Bill

Keep the pipe.

It does very little bad and a lot of good.
Rich Amos (1330cc Blaze Red '72)

This thread was discussed on 20/05/2008

MG Midget and Sprite Technical index

This thread is from the archive. The Live MG Midget and Sprite Technical BBS is active now.