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MG MGB Technical - oil thrower

can someone tell me what way round does the oil thrower plate go round under the timing cover on the crank,took it off on rebuild and cant remember what way round it was,cant find it in manual.

thanks in advance.

bob 1970 bgt
Bob Taylor

Bob. It should be marked with an embossed "F" indicating that is the side which goes forwards.

Les
Les Bengtson

Bob. Fortunately, I have an engine in pieces on my bench and had the oil slinger to hand. When installed with the side having the "F" facing forwards, center portion is further forwards than the outer rim. (The piece is built on two levels with the central portion being about 1/8" different than the outer portion. Properly installed, the outer section is further rearwards than the center section.) But, this latter is in case you have an aftermarket part not made to the original specifications. If using the original part, F for forward is easy to remember.

Les
Les Bengtson

Interesting. The Workshop Manual and Parts Catalogue illustrations show the 'cup' of the slinger facing forwards, this seems to be the otherway round to how I interpret Les's description. It's also how logically I would expect it to be - the outer edge of the slinger as close as possible to the face of the front cover to pick up as much oil as possible, i.e. cupped round the front seal, thus keeping falling oil off it.
Paul Hunt

PS. The V8 Workshop Supplement shows it the same way - cup facing forwards, and additionally states "Fit the oil thrower with the concave side facing outwards". The concave side is the cupped side, and 'outwards' I take to mean 'forwards'.
Paul Hunt

Paul-
Les has it right. The purpose of the oil thrower is not to shield the seal, but rather to assist in lubricating the camshaft drive chain. This being the case the rim of the oil thrower should be as close to the chain as possible, thus its rim is offset towards the chain, not the seal.
Steve S.

Hi Guys - actually there are 2 types of thrower, the flat stepped type fitted to 5 main engines stamped "F" and where the raised centre part is fitted forward - and the dished type (like a dinner plate) fitted to the early engines which is fitted with the dish facing forward so the edge overlaps the inside of the seal seating which was the felt type.

Unfortunately the parts list can't be relied on to show accurate pictures of the parts!
Chris at Octarine Services

Maybe that explains why the V8 has the cupped slinger facing forwards - as it has the rope seal! I must admit being suprised my 75 engine still had a rope seal, although it works just fine. Even more surprised now if 5-main engines from 1964 had the lipped rubber seal - if indeed that is what they have.
Paul Hunt

Paul-
Yep, that's what they have.
Steve S.

This thread was discussed between 06/12/2008 and 10/12/2008

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