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MG Midget and Sprite Technical - Timing chain oil thrower

Good evening Gentlemen
I forgot which way round the thrower faced. The Haynes manual describes it somewhat clumsy, I think (or my English skills aren't suffient.
Can someone please determine whether this is the right way or not (image attached)
Thank you
Jan

Jan Kruber

Jan

I think the ‘F’ denotes front.
Dave O'Neill 2

Looks correct
But it always pays to check,specially if it has a new chain or sprockets
Push it hard back against the sprocket and check that you have clearance with the chain pins, specially if the chain has a joining link, check that the joining link clears
willy
William Revit

Reason for asking is, that when dismantling, the thrower faced the opposite way, that is, the "F" faced towards the engine, thats why I looked in the Haynes and got confused......
Thank you for the replies
Jan

Jan Kruber

The BMC/BL Workshop Manual states for the simplex chain - 'Replace the oil thrower; with the face marked 'F' or the concave side (early type) away from the engine'.

No reference to the timing chain in the 1275 engine section of the manual, so that would normally mean the same applies.

'Away from the engine'?? Presumably that means towards the Front of the engine? That is certainly the way I have installed the thrower with a duplex chain!

Richard
Richard Wale

Richard
See what I mean, confusing, right?
The term concave is used for surfaces that bend inwards or down. The term convex isused for surfaces bending out or up.
If I assemble with the "F" away from the engine the concave side of the thrower is facing towards the engine. If I assemble with the concave side of the thrower away from the engine the "F" is pointing towards the engine......
That's why I still wonder: Should I go for the F or the concave side?

Image below, the convex side with an "F" ???

Jan


Jan Kruber

My 1973 BL Workshop manual seems to contradict itself:

Section A.22: "Ensure the oil thrower behind the crankshaft pulley is fitted with the face marked 'F' away from the engine" ...

"NOTE._ The early type front cover and oil thrower must be used together. When fitting; ensure the oil thrower is fitted with its concave side facing away from the engine..."



To my mind, concave facing away from the engine would tend to throw oil forwards slightly, towards the cover and oil seal. Concave facing towards the engine would throw oil slightly backwards and onto the chain and back towards the block. Isn't there a hole that allows oil in the space behind the timing cover to drain back into the sump?

The exploded diagram of the Engine Internal Components appears to show the thrower with the convex side facing the sprocket/block.

Probably no help whatsoever as it's a very long time since I had an engine in pieces!

Colin
C Mee

Too slow - edit timed out!

Here's how it appears in the BL Workshop Manual.

C Mee

Not from an A series, but this suggests that concave facing forwards is the way to go:

http://youtu.be/MFRgb4L52tA
C Mee

And an interesting post on the Morris Minor Owners' Club website:

http://www.mmoc.org.uk/Messageboard/viewtopic.php?t=56478
C Mee

I would agree that the earlier curved thrower is fitted concave side forward, but the later 1275 thrower is fitted with the ‘F’ to the front.
Dave O'Neill 2

Jan
Fit it as in your pics----F to the front

The early slinger is completely different and looks more like a bowl, and if fitted incorectly the chain gobbles it up

BUT
you still need to check clearance if your chain has a joining link, just to make sure it clears the slinger

willy
William Revit

This thread was discussed between 29/01/2019 and 31/01/2019

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