Omega Owners Forum
Omega Help Area => Omega General Help => Topic started by: toller on 04 December 2007, 19:01:38
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I fitted some vectra rocker gaskets to my omega the other week and i thought all was well, started it today only to get a horrible tappety sound and upon closer inspection it looks like the drivers side cover is spewing oil out the back. Stripped everything down only to find a few of the bolts on the drivers side cover don't really tighten properly so i'm assuming they're stripped or just about to.
If i drill them out to a bigger size and re-tap them will this be ok or is it going to cause problems.
Secondly does anyone have a part number for the actual gaskets, the covers came with a set but i'm having trouble finding them. The only difference I can see in the gaskets is that the ones for the aluminium covers don't have the big rubber semi circle at the back, they only have a semi circular strip as the actual semi circle is part of the cover.
A vauxhall part number would be great.
Thanks
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Is the Omega engine alloy? without checking I aren't sure.... :-?
If it is steel i would drill then re tap, if alloy i would just re tap.
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The cam covers bolt into the camshaft bearing shells
You really want to use your original bearing shells, if you can - they're unique in how they are machined.
Chase out the threads, it doesn't take much to hold to 8nm - and don't tighten without a torquewrench! How many exactly are stripped?
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Part No. for the gaskets on ally covers from a 96 Vectra are 24450871 & you need 2,
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The camshaft bearings will be line-bored with the caps in place making them unique to the head so it's imperative that they are matched to the head and in the correct locations. A mate of mine tried to use caps from another head once - and snapped a camshaft (while he was torquing the cap bolts up). :o
I'd try just chasing them out with a tap as James suggests and maybe use a little thread locking compound when refitting the cam cover bolts to fill any gaps.
Kevin
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Another member on here suggested using a long bolt or stud the same thread size as the cam cap, screwing a nut onto the stud, then screwing the stud or bolt into the cam cap as far as it will go, back the stud off a tad & tighten the nut onto the cam cover. Apparantly the original bolt does not go all the way through the cap & the amount of thread stripped is equal to the length of the bolt leaving some threads lower down in the cap undamaged,like James said 8nm torque is not very much, HTH