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Oil pump lapping

 
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Rockyrob



Joined: 05 Dec 2007
Posts: 98
Location: Queensland Australia

PostPosted: Thu Nov 06, 2008 12:35 am    Post subject: Oil pump lapping Reply with quote

1970 750 S . I am putting bike back together this weekend and thought i would lap the pump before i fit the timing case as i have wetsumping issues like most others. I have a couple of questions if you can assist please. The pics below might help .
There was no gasket or material between the pump and the crankcase where i have read there should be something?
What should I use?
What does the grommet do? mine is a bit tattered and worn, does it affect anything. Can i take it out and refit it asit interferes with lapping the body.You may be able to see by the coloring of the faces that things have not been seating flush, Would this agravate the wet sumping I wil be lapping the surfaces anyway but thought maybe a sealant on the end covers might help? I have read about priming the pump after refitting it , how do i that



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Keith1069



Joined: 10 Jan 2005
Posts: 239
Location: Hampshire UK

PostPosted: Thu Nov 06, 2008 1:20 am    Post subject: Reply with quote

Hi.
That little grommet seals the pump output to the timing cover and on to the crank bearings so it's under full pump pressure! I would replace but if it's not split you can re-use temporarily. They look tatty cos they're squashed tight between pump and cover. It will come off easily and you may find the tube insert it sits over will also come out.
There should be a thin paper gasket between pump and timing case. It's only about 003".
You can prime the pump by making sure it's full of oil when refitted and unless you are desperate to start the engine let it sit overnight or at least a couple of hours and the oil will find it's way into the pump. Some talk about filling with Vaseline but it's not necessary with a gravity feed.
Look at http://www.nortonmotors.de/ANIL/Norton%20Website/norton/index.php
for explode views and parts lists
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The Unapproachable Norton Commando

At the end of 1967 the Norton Commando was announced.

The Norton Commando was greeted with a certain amount of scepticism because on first sight the commando appeared to comprise of the old Norton Dominator twin cylinder engine mounted at an inclined angle in a set of new cylinder parts.

It was not realized that the new Norton Commando Isolastic method of engine suspension damped out all engine vibration and produced a machine which had uncanny smoothness for a vertical twin. In due course the critics were silenced and the Norton Commando had the distinction of being regarded as the first of todays so called superbikes. There can be little doubt that the original design concept of the Norton Commando has proved correct, since comparatively few modifications of any real consequence have been made since production commenced during 1968.

Now nearly 40 years later Norton Commando riders like us are a breed of our own, and as far as we are concerned its still more fun to go for a blat on the old Norton Commando, and fast. As a Norton Commando owner and enthusiast, my goal here is to promote and give credit to those who keep the Norton name going.

It is more deserving to give credit to the Commando itself, for after all these years it continues to be respected. The original Commando designers like John Favill are those who deserve the credit for developing this incredible motorcycle.

The Norton Commando Roadster and Interstate of the late seventies, never died. Although the Norton Villiers factory dispersed the tradition lived on. Today Kenny Dreer in the USA is developing the new 952 CC Norton. What a great looking bike this is, and its engineering is still based on the original layout. It will be interesting to see how the new 952CC Norton does in todays tough motorcycle market. One thing is for sure, I would own one if I could afford it.