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900 thermostat O ring gasket

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Old Oct 20th, 2018, 16:19   #1
jpliddy
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Default 900 thermostat O ring gasket

hi all i have just purchased a thermostat and O ring gasket for my 940 tdi i can't get the O ring gasket to fit into the engine block im told i have the wrong O ring the one from volvo dealers is different than the old one i took off the new O ring is square shaped with a small groove in the middle which does fit nicely round the outer edge of the thermostat . the old O ring sat on the outside face of the thermostat the stat is nearly the same size as the hole in the engine block so when O ring is fitted to outside edge it will not fit .
can any of you guys with the petrol engine tell me if you have a O ring that fits round the outside edge with the small groove . this will tell me for sure i have the wrong O ring . i have put the old O ring back and applied a small amount of HYLOMAR sealant this has stopped the leak i had for now
all comments most welcome .
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Old Oct 20th, 2018, 16:26   #2
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Redblock thermostat o-ring is the square type with groove.
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Old Oct 20th, 2018, 18:26   #3
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Default thermostat

hi thanks for your comment don't suppose you woud have the part number and spec of car ie 940 LTP and .year approx
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Old Oct 20th, 2018, 20:53   #4
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If you have the incorrect O ring perhaps it came with the wrong thermostat? There's no shortage e.g. item 2325937608, which is QH and as a bonus is the higher temp 92 degree opening one.

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Old Oct 20th, 2018, 21:24   #5
jpliddy
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Default thermostat

hi jor
the stat ive just got is exactly the same as the stat i put in the car D 24 2 years ago . i only need the O ring really but got the stat to as they are not that expensive well £ 18 for stat and 0 ring take it you have replaced your stat on the D24 too over time just hope the new O ring is the same as the original one do you have any part numbers ?
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Old Oct 20th, 2018, 22:53   #6
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No numbers I'm afraid, but it's always difficult trying to find a part gasket minus part. I think it will be carry on with the old one and hope it lasts, or part with a few quid.

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Old Oct 21st, 2018, 12:10   #7
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Jim, there's a very high chance you have the correct gasket, also that the recess it should sit in on the head has become encrusted with a combination of old gasket, limescale and rust. Use a screwdriver to gently scrape round where the thermostat should sit and you will almost certainly find the recess is there. If so, clean it out with the screwdriver blade and smear some vaseline or silicone grease round the new 'stat seal after fitting it to the 'stat.
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Old Oct 21st, 2018, 18:48   #8
jpliddy
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Default thermostat

hi dave i really cleaned around recess with 800 emery paper . asked the question on the D24 forum and came back the grooved gasket is not the one for this engine so for now no leaks and my volvo dealer has ordered another gasket ive had parts come wrong before so will see what turns up thanks for your comments dave
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Old Oct 21st, 2018, 21:12   #9
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Quote:
Originally Posted by jpliddy View Post
hi dave i really cleaned around recess with 800 emery paper . asked the question on the D24 forum and came back the grooved gasket is not the one for this engine so for now no leaks and my volvo dealer has ordered another gasket ive had parts come wrong before so will see what turns up thanks for your comments dave
regards jim
Sorry Jim, i missed wherever it said it was diesel! Ignore me on this one then!
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Old Oct 24th, 2018, 19:39   #10
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My brother had no end of problems with his Diesel Mk2 Golf thermostat (same engine but the 4 cylinder variant). Aftermarket parts rarely fitted without Hylomar to help seal it. Has it got the plastic 90° bend that keeps the thermostat in place (bottom radiator hose attaches to it)? If so these sometimes warp over time and leak too.
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