Timing case oil thrower

Post by **youngun** » Fri May 09, 2008 10:20 pm

is the concave shape washer (known as the oil thrower) supposed to slide onto the crankshaft up against the timing chain sprocket, the diagram in the manual isnt really that helpful. The concave washer i have isnt large enough in internal diameter to slide onto the crankshaft.
Or am i being thick?

Cheers,
YG

Post by **youngun** » Fri May 09, 2008 10:20 pm

Oh and whilst im at it, the o ring valve stem seals......they do just litterally sit on top of the valve guide dont they?

Post by **Mogwai** » Fri May 09, 2008 11:28 pm

To fit the valve guide seals 1st compress the spring then fit the O ring onto the valve stem followed by the collets when the spring is released it should compress the seal between the collets & the valve cap to prevent oil running down the stem.
The oil thrower should slide onto the crank nose easily it has a nocth in it for the woodruff key & an F for front stamped in it

Post by **youngun** » Sat May 10, 2008 2:04 pm

Thats handy, i dont appear to have said oil thrower!

Post by **youngun** » Sat May 10, 2008 6:11 pm

A couple of pics of the engine at present......
http://s166.photobucket.com/albums/u118 ... C00366.jpg
http://s166.photobucket.com/albums/u118 ... C00368.jpg

Im assuming that this is not the oil thrower but a lock tab for the crank dog??
http://s166.photobucket.com/albums/u118 ... C00369.jpg

Post by **youngun** » Sat May 10, 2008 8:41 pm

Update.....i had one of my idiocy moments, the oil thrower was residing in its labelled bag, but not in the engine box for some reason!
So the next conundrum is, when the timing cover is bolted on and tighethend up, the thrower scrapes against the inside of the cover!! Can i just file the thrower down until it doesnt? I assume its doing this because ive got a duplex kit fitted and the timing cover is from a 1098 engine (mine being a 948).

Post by **polo2k** » Sat May 10, 2008 9:18 pm

without this thrower would the engine be more prone to oil leaks from the nose of the crank?

Post by **les** » Sat May 10, 2008 10:36 pm

There are two types of valve seal, the latest ones fit over the actual valve guide. Usually fitted to the inlets only. They look a bit like a top hat.

Post by **RogerRust** » Sun May 11, 2008 8:46 am

My BMC manual says that a modified oil thrower is fitted to the later 1000 engines with the rubber oil seal and is fitted with the side marked F away from the engine.

My copy of the microfiche identifies them as 2A1015 and 12A1148 for the later thrower fitted with the rubber seal. The 1098 only had the later thrower.

Post by **bmcecosse** » Fri May 16, 2008 12:00 am

Later throwers were virtually flat - but really your duplex gear should not be any thicker than the original gear. Are you sure the gear is firmly home on the crank nose - and correctly lined up with the cam sprocket ? Could also be that the timing case is slightly damaged - bent inwards due to levering off crankshaft pulley ?

Post by **polo2k** » Fri May 16, 2008 1:44 pm

Im fairly sure that this was a part i 'forgot'
what exactly does the thrower do? is it there to create a lower oil level around the seal? Im just asking because I dont seem to be getting the seal to engage with the crank pully it appears to be the right size (approximatly) and before I start changing timing covers etc I thought id ask for some advise on here

-Ta-

Post by **bmcecosse** » Fri May 16, 2008 2:02 pm

The thrower does what it says on the packet - as it spins round with the crank any oil coming on the surface is thrown away from the seal thus preventing it being overloaded with floods of oil! The seal - seals on the hub of the crank pulley - not on the crank itself. When fitting load the seal with grease and leave the timing cover bolts just 'nipped' - then carefully slide in the crank paulley and gently turn the engine over a couple of times to allow the seal and cover to self-centre on the hub - then tighten up the cover bolts (careful - easy to strip the little ones) and tighten up the starter dog. I put some Loctite on the thread to stop it coming loose - and you should try to fold over the edge of the lock-washer although the access is not good.

Post by **youngun** » Fri May 16, 2008 4:58 pm

bmcecosse wrote:Later throwers were virtually flat - but really your duplex gear should not be any thicker than the original gear. Are you sure the gear is firmly home on the crank nose - and correctly lined up with the cam sprocket ? Could also be that the timing case is slightly damaged - bent inwards due to levering off crankshaft pulley ?

Well the sprocket on the crank just slides on, and the cam sprocket has been tightened up and the chain is on so im assuming the sprocket is in the correct position. The timing cover is NOS, it does look like it has suffered a bit of a dent inwards though, ill have a little fiddle sometime and see if i can bend it back out a bit, if not ill just file down the thrower a bit!

Post by **bmcecosse** » Fri May 16, 2008 5:40 pm

Just check the overall thicknes of the duplex crank sprocket compared it to the standard simplex sprocket - but it should be the same. You can safely file or grind the thrower a little - as i said the later ones were almost flat anyway. It has to go on with the raised edge facing away from the engine - sort of wrapping round the seal housing in the timing case. And - have got a gasket in place when doing this check - it's quite thick and may make the difference.

Post by **youngun** » Fri May 16, 2008 5:53 pm

Yeap i have the gasket on there. Ill get my file out!

Post by **bmcecosse** » Fri May 16, 2008 6:01 pm

Maybe just try to 'spring' the timing case outwards with your thumbs if it looks pushed in ?