Omega Owners Forum

Omega Help Area => Omega General Help => Topic started by: Blackie_No1 on 13 January 2010, 19:45:00

Title: 3.0L Crank shaft oil seals
Post by: Blackie_No1 on 13 January 2010, 19:45:00

What is involved in replacing these, specifically the front?

Title: Re: 3.0L Crank shaft oil seals
Post by: rustym95 on 13 January 2010, 20:28:46

alot of swearing and keep kettle on stand-by :y

Title: Re: 3.0L Crank shaft oil seals
Post by: Darth Loo-knee on 13 January 2010, 20:34:23

A Crank Locking Tool is needed to get the Crank sprocket off it is super tight....

Cambelt has to be remove etc

Title: Re: 3.0L Crank shaft oil seals
Post by: Marks DTM Calib on 13 January 2010, 21:00:09

Not so bad a job....cam belt off and then as said, lock the crank (you need to do this on the crank sprocket ot you will shear the woodruff key)

Title: Re: 3.0L Crank shaft oil seals
Post by: Andy B on 13 January 2010, 22:14:38

Quote

...... or you will shear the woodruff key)

How? If the key is in the crank within the pulley, how is undoing the bolt in the end going to impart a shearing action on the key?  :-/

Title: Re: 3.0L Crank shaft oil seals
Post by: Marks DTM Calib on 14 January 2010, 08:11:37

Quote

Quote

...... or you will shear the woodruff key)

How? If the key is in the crank within the pulley, how is undoing the bolt in the end going to impart a shearing action on the key?  :-/

Because they are that B-tight that as you turn the bolt, it exerts a turning motion on pulley before releasing.....hence it shears it off

Title: Re: 3.0L Crank shaft oil seals
Post by: Andy B on 14 January 2010, 08:35:30

Quote

Quote

Quote

...... or you will shear the woodruff key)

How? If the key is in the crank within the pulley, how is undoing the bolt in the end going to impart a shearing action on the key?  :-/

Because they are that B-tight that as you turn the bolt, it exerts a turning motion on pulley before releasing.....hence it shears it off

It must be a soft key then  :-?. Having never removed the Omega's I'll take your word for it, but haven't had problems with a 'heavy handed approach'  ::) on my Senators or her Astra G.  :y

Title: Re: 3.0L Crank shaft oil seals
Post by: Matchless on 14 January 2010, 12:42:24

The key is an integral part of the cambelt sprocket which is sintered (moulded) from metal powders and ceramics to get the necessary accuracy and wear tolerance.
Definately does not like shock loads from an air impact wrench or clouting a breaker bar with the car in gear etc. so you must bolt a bar to the sprocket directly to stop it rotating.

Title: Re: 3.0L Crank shaft oil seals
Post by: Blackie_No1 on 14 January 2010, 20:42:37

So the sump stays on then? 

Title: Re: 3.0L Crank shaft oil seals
Post by: Matchless on 15 January 2010, 13:16:30

Sump stays on.

Lock crank and cams @TDC
Remove cam belt
Turn crank BACK to 60 deg BTDC
Bolt a length of angle to the crank sprocket using the holes for the aux pulley and brace against the chassis or get someone to hold it...but becarefull not to let the crank move very far.
Remove centre bolt...vvvtight...breaker bar plus 1m scaffold pipe.
New bolt needed on reassembly, tighten to 150nm? plus 60 deg?

Title: Re: 3.0L Crank shaft oil seals
Post by: Matchless on 15 January 2010, 13:28:10

I thought I did a guide for this but cant see it in the list. I have all the photos so will try to find time to add some words.

Title: Re: 3.0L Crank shaft oil seals
Post by: Blackie_No1 on 15 January 2010, 17:00:10

Schweet!  Cheers....