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700/900 Series General Forum for the Volvo 740, 760, 780, 940, 960 & S/V90 cars |
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Thermostat housingViews : 972 Replies : 16Users Viewing This Thread : |
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Feb 24th, 2019, 18:22 | #1 |
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Thermostat housing
Fitted a new stat and seal when I did my coolant flush the other week and I think I have a slight weep on the stat housing. Worried in case I have over tightened.
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V70 D5 SE Geartronic 215bhp Saville Grey 2012MY 940 LPT Manual 1996 740 SE 1990 |
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Feb 24th, 2019, 19:05 | #2 |
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Did you fit a new seal and/or gasket Mark? I'm having a mental block at the moment and can't think of the red-block 'stat but something is telling me it's the "grooved 'O' ring" that wraps round the outside of the 'stat. If so, did you scrap away any oxidisation on the 'stat housings and smear it with Vaseline or silicone grease?
Also worth cleaning the bolt threads and also the bolt hole threads and putting a smear of copper grease on them to help prevent intermetal corrosion. Finally, clean the mating faces of the 'stat housing and where it bolts onto the head - ay dirt here can cause a weep. Likewise with the oxidisation in the recesses in the head and 'stat housing where the seal sits.
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Feb 24th, 2019, 19:51 | #3 |
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Hi Dave
It comes with a new seal and I thoroughly cleaned and scraped both mating surfaces. It was a Volvo genuine stat and seal so just wondered if by tightening too much it could possibly distort the seal ? I've cleaned up around the housing and will keep an eye on it. Not sure if there are torque settings for those bolts Cheers, Mark
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V70 D5 SE Geartronic 215bhp Saville Grey 2012MY 940 LPT Manual 1996 740 SE 1990 |
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Feb 24th, 2019, 20:00 | #4 |
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If they shear off then its too tight.
Corrosion can cause issues with sealing. You can often need to give them a clean up with sand paper |
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Feb 24th, 2019, 20:06 | #5 | |
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Quote:
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Feb 24th, 2019, 20:38 | #6 |
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In my experience the nuts don’t need to be very tight at all but it helps to tighten them evenly. I use a small 1/4” torque wrench. If you over tighten them it will be difficult to dismantle again in the future. These nuts are very easy to round off.
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Feb 24th, 2019, 20:47 | #7 |
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I found 11-15 lb ft on web. Around 17 nm
One of mine was starting to round off slightly so I used a 6 sided socket. I only did them up hand tight and just kind of nipped them half a turn after that Spose it depends how strong you are though
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Feb 24th, 2019, 20:51 | #8 |
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940 tdi auto 1995
Hi i fitted genuine stat and had a weep i took stat off and cleaned it with fine emery paper to mateing surfaces and then i use a silocone based stat sealant and no leaks now
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Feb 24th, 2019, 22:41 | #9 |
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I’d be wary of the torque settings on the web. They are quite high for the size of the bolts. They are 10mm head but only 6mm thread. I’ve used a maximum of 6-7 ft lbs in the past. The same applies to the water pump. There’s a report here warning about those.
http://www.calgaryvolvoclub.com/foru...php?f=1&t=3029 |
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Feb 25th, 2019, 08:41 | #10 |
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940 tdi auto 1995
hi the gasket sealant i was advised to get was HYLOMAR instant gasket i have never heard of it its done the job for me and easy to get hold of . only my thoughts! make sure surfaces are clean i sed a 600 grit emery paper
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