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[monza789]

Thanks for that Kevin.......Im getting  a mental picture of how it works now...i think..!

So why do you think the VX guy and the man who sold the engine said it didnt matter about the spigot bearing?.....

I tend to agree with you about the logic in supporting the input shaft end....needs to be retained to keep it true and in line..!

Looks like ive got to fork out another wad of dosh to get him to take the gearbox and flywheel off the fit the bearing......might as well get a clutch fitted also i think..!!


monza

[RonaldMcBurger]

Hi Monza

Ok, step by step lets cover all this.

Firstly the cam covers can easily leak at 58k if the car hasn't been correctly maintained, especially in relation to correct oil and regular changes. As Mark always says, a car is only as good as its previous owner.

Now the spigot bearing issue. Your vauxhall guy is talking b@llocks. The spigot bearing is fitted to ALL Omega v6 vauxhall engines with a manual gearbox. No exceptions. It wasn't inveted for fun, it has a purpose - aligning the clutch and input shaft. The clutch will not be aligned without it as you have nothing to align it with! I strongly suspect the vibration is your clutch out of alignment.

Solution: Gearbox back off, fit spigot bearing, align clutch PROPERLY and put back. Problem solved.

Trust me, I do know what I am talking about. Jeez, the number of times we see cambelts wrongly fitted by trained VX technicians.  I am sure your mechanic THINKS he is right, but he is wrong.

As for cost, no nothing. Well the cost of the spigot bearing which you can buy for about a tenner I would think. It is NOT your fault that the mechanic has put it together wrongly, so why should you pay?

[Kevin Wood]

As for cost, no nothing.

Damn right. The mechanic has told you he didn't fit a spigot bearing. That was his mistake so he pays to put it right, IMO.

The reason he sees some engines with this bearing and some without is that engines from an automatic car don't have one! He is inventing ideas to explain his observations!

In any case, if there were manual cars which didn't require a spigot bearing it would have been down to the gearbox, NOT the engine since the gearbox input shaft would have to be located by a bearing in the gearbox instead. Your gerarbox had a spigot bearing in the first place so he should have re-fitted one. What a load of hassle for the sake of a part costing a couple of quid!

Kevin

[monza789]

Hi Guys,

Ive removed the gearbox and fitted the spigot bearing.......as well as having a new clutch installed.....

Result......the vibration seems to have disappeared........thanks for the advice guys....

monza

[TheBoy]

Hi Guys,

Ive removed the gearbox and fitted the spigot bearing.......as well as having a new clutch installed.....

Result......the vibration seems to have disappeared........thanks for the advice guys....

monza

Sorted

Now go and tell that idiot what a pillock he is.

[Marks DTM Calib]

Well its not surprising.....I pity the gearbox of any car that service manager has fitted a lump to....

Imagine this....you have a  long thin (relatively) gearbox input shaft with a bearing at each end, on one end, the shaft protrudes another 300mm or so beyond the bearing. Near the end of this 'protrusion' you mount a large diameter clutch friction plate.....

.....then spin the assembly at high speed without supporting the very end of the 'protrusion'.......not nice at all. hence the vibration!!!

This is why a spiggot bearing is ALWAYS used for a manual box!

[monza789]

Hi Guys......have had the gearbox off again....fitted the spigot bearing and changed the clutch whilst am at it as there wasnt alot of life left in it...!

Anyhow ...theres no vibration now.....but the gears are a bit tight to get when starting off in 1st especially....and reverse......the guy said it was very tight getting clearance during fitting initially but the difficulty in selecting 1st gear will get better when the clutch has bedded in a bit...!

Thanks again guys...your help is invaluable...

cheers
monza

[TheBoy]

Hi Guys......have had the gearbox off again....fitted the spigot bearing and changed the clutch whilst am at it as there wasnt alot of life left in it...!

Anyhow ...theres no vibration now.....but the gears are a bit tight to get when starting off in 1st especially....and reverse......the guy said it was very tight getting clearance during fitting initially but the difficulty in selecting 1st gear will get better when the clutch has bedded in a bit...!

Thanks again guys...your help is invaluable...

cheers
monza

Not the same idiot who didn't fit the bearing?

[monza789]

Hi The Boy,

NOOOOOO ....it was a different man who took the box off and fitted the bearing.....he did the clutch as well......and he gave me the new engine No. of the replacement engine for my records.

Monza

[stevebubs]

Does the input shaft really need supporting at the end as its already located in the spline on the clutch ?......have you come across these symptoms before

Remember that the clutch driven plate is only sandwiched between the flywheel and pressure plate. When you press the clutch pedal the pressure on the clutch plate is removed and it is loose between the two, so it is vital that the gearbox input shaft remains accurately located as this is holding the driven plate central.

Can the clutch be causing this problem?......

I guess it could if there was a missing spring or something. Having said that with a dual mass flywheel the driven plate may be mounted solid. Either way it needs to be removed to check, unfortunately

and why does the problem cease if the clutch is dipped at the same road/engine speeds

This will release the force clamping the driven plate. If it wasn't entirely central when it was engaged I guess it could centralise when running at speed as it will be acting like a gyroscope.

Kevin

Ditto. If you haven't fitted a spigot bearing into the end of the crank, get one fitted pronto.

gearbox shaft is only connected to 50% of the clutch and that 50% is floating within the flywheel cover plate. When the clutch is not depressed and the clutch isn't 100% central on the flywheel, you're putting unnecessary load on the gearbox and engine bearings (and also on the clutch plates)...

I know it's not a nice job, but pull it out, fit spigot bearing and put it back together. The spigot bearing will make sure the crank and gearbox shaft are 100% aligned at all times...

Failure to do so will most likely knacker one or all of your gearbox, engine and clutch...

If you've been running like this for a while, I'd also replace the clutch as you don't know how much damage you've done to your existing one and you really don't want it shattering on you...

[stevebubs]

Doh...above reply was a little bit late....would have refrained if I'd noticed page 2 before hitting reply....