Omega Owners Forum - Different thermostats???

kcl

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Drives: 2002 Opel Omega 2,6 Caravan Auto

Different thermostats???
08. May 2011 at 18:24

Still had it leaking... Original was replaced with a pattern one, only a simple o-ring as a gasket. The original stat housing had a deep groove for the gasket and the original gasket I bought to be used with the pattern stat was useless. The genuine gasket was a quite complex rubber seal and dealer said that the very last ones were with this "new style stat". Now I've bought a new stat from dealers and was sold the "old style" stat, e.g. no twith the deeper groove for gasket. Doesn't seem to leak though.

My question: are we sure that the engine block is the same in the "new" 2,6 and the "old" 2,6. So I should be safe to use the "old style" stat? Of course I binned the original before I was sure I don't need it Sad

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TheBoy Administrator Offline TBE has an MOT! Posts: 64817 Brackley, Northants Gender: Drives: 98 MV6, 03 Elite, 00 25, 89 ZX10	Re: Different thermostats??? Reply #1 - 08. May 2011 at 18:58 There are 2 types of stat, which take different o rings iirc, and due to flange thickness, different bolts. Neither is better than other.
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kcl Senior Member Offline Posts: 696 Finland Gender: Drives: 2002 Opel Omega 2,6 Caravan Auto	Re: Different thermostats??? Reply #2 - 08. May 2011 at 20:14 ok, thanks. So I'm OK using the old style one instead the new styl ewhich was the original? The newer style o-ring seemed to be much more rigid design, wonder why... Known problem with sealing the stat at GM
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TheBoy Administrator Offline TBE has an MOT! Posts: 64817 Brackley, Northants Gender: Drives: 98 MV6, 03 Elite, 00 25, 89 ZX10	Re: Different thermostats??? Reply #3 - 08. May 2011 at 20:18 kcl wrote on 08. May 2011 at 20:14: ok, thanks. So I'm OK using the old style one instead the new styl ewhich was the original? The newer style o-ring seemed to be much more rigid design, wonder why... Known problem with sealing the stat at GM Dont think one is old style and other new style, just 2 different styles.
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kcl Senior Member Offline Posts: 696 Finland Gender: Drives: 2002 Opel Omega 2,6 Caravan Auto	Re: Different thermostats??? Reply #4 - 08. May 2011 at 20:27 Ok, two different then but interchangeable, right?
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TheBoy Administrator Offline TBE has an MOT! Posts: 64817 Brackley, Northants Gender: Drives: 98 MV6, 03 Elite, 00 25, 89 ZX10	Re: Different thermostats??? Reply #5 - 08. May 2011 at 20:34 kcl wrote on 08. May 2011 at 20:27: Ok, two different then but interchangeable, right? Yes, but you need right seals and bolts for your specific type, if that makes sense
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kcl Senior Member Offline Posts: 696 Finland Gender: Drives: 2002 Opel Omega 2,6 Caravan Auto	Re: Different thermostats??? Reply #6 - 09. May 2011 at 06:00 Yes it does make sense. I've got the "other" type now instaled, with the simple O-ring and shortened bolts.
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Guffer Omega Lord Offline Music to watch girls by.... Posts: 6142 Hampshire Gender: Drives: R Reg 2.5V6 Omega ELITE & P reg Omega 2.5 V6 CDX	Re: Different thermostats??? Reply #7 - 09. May 2011 at 06:45 Don't forget to wet n dry the mating surface otherwise choice of thermostat won't matter
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Marks DTM Calib Administrator Offline Ex Member Posts: 25671 Northern Hemisphere Gender: Drives: Astra J, Mum Bus, Dexta Tractor, 108 DMU wip	Re: Different thermostats??? Reply #8 - 09. May 2011 at 12:22 TheBoy wrote on 08. May 2011 at 18:58: There are 2 types of stat, which take different o rings iirc, and due to flange thickness, different bolts. Neither is better than other. Nah, the one with the larger flange that takes the complex gasket has a much better and more reliable seal with the block face.
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kcl

Senior Member

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Posts: 696
Finland
Gender: male

Drives: 2002 Opel Omega 2,6 Caravan Auto

Re: Different thermostats???
Reply #9 - 09. May 2011 at 13:38

This is getting interesting. So I have replaced the better design stat with the not-so-good one? Nice Embarrassed

But then again, I'm getting more and more familiar with the b-bolt, which is now routine and in fact quite easy one. What I don't like is taking the inlet trumpets and flange out again and again... I hope it will not leak anymore.

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Guffer Omega Lord Offline Music to watch girls by.... Posts: 6142 Hampshire Gender: Drives: R Reg 2.5V6 Omega ELITE & P reg Omega 2.5 V6 CDX	Re: Different thermostats??? Reply #10 - 09. May 2011 at 13:50 The b-bolt has differing degrees of bstrdness depending on the car, I have done some which were easy peasy, others were a real pig.
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