Bit of Advice

EMM · May 26th, 2010, 20:00

Hi All, i went to change my thermostat as the engine seems to be taking ages to get to temp and for love nor money can i undo the bolts holding the housing on.

I started to undo one and it just began to split, so i got a friend to help and he actually broke the bit, but the star bolt remains undamaged. I even tried when the engine was hot.

I am very reluctant to use an impact screwdriver incase it damaged the housing.

Does anyone have any useful tips or tricks for getting this undone, as i really don't want to drill them out.

cheers
Andy

ShadeTek · May 26th, 2010, 20:26

Dremel a slot across the remains of the bolt and use a screwdriver to get it out. There are modified bolts to replace these as it is a known issue. Before taking the housing off, clamp the hose from the reservoir to the housing so it doesn't empty out over the engine.

EMM · May 26th, 2010, 20:34

Going to sound a bit stupid here, Dremel a slot across the bolt head? As i'm just worried that it's cause serious damaging and i'll have to replace more than just the housing bolts.

Also will have to remove most of the injectors house etc? and where do i get the modified bolts from.

Sorry to ask a load of questions but as it is my daily driver i really can't afford to mess it up.

Cheers
Andy

ShadeTek · May 26th, 2010, 20:50

Get the modified bolts from Volvo, then Dremel across the bolt head.

gdphillips · May 26th, 2010, 22:21

weld a nut on it.....tig arc ????????????spare if you mash it right up......

georgem · May 27th, 2010, 01:02

Insert the bit and then give it a couple of sharp hard raps with a hammer, always works for me.

SwedishInside · May 27th, 2010, 11:53

I had this exact problem. I bought a brand new torx driver and tried to undo one bolt then suddenly... Crack!!! I thought I broke the bolt but luckily I broke the torx driver. lol.
I gave up and handed my car over to Volvo (who made a wonderfully easy job of it).

Lack of patience...

(probably)

Oh well.... Hope you get yours done... Somehow.

ratfink_v70_2000 · May 27th, 2010, 14:06

Hi, just done this last week. I sprayed wd40 on the bolt heads and thermostat housing 4 0r 5 times the day and night before I did it so it had a soak and then made sure I had good access to the bolt heads so that the bit was going in perfectly straight. When I did it next day it took 10 minutes. Hope you get yours sorted.
Rich.

May 26th, 2010, 20:00	#1
EMM Senior Member Last Online: Jun 21st, 2024 16:15 Join Date: Jan 2010 Location: Cheltenham	Bit of Advice Hi All, i went to change my thermostat as the engine seems to be taking ages to get to temp and for love nor money can i undo the bolts holding the housing on. I started to undo one and it just began to split, so i got a friend to help and he actually broke the bit, but the star bolt remains undamaged. I even tried when the engine was hot. I am very reluctant to use an impact screwdriver incase it damaged the housing. Does anyone have any useful tips or tricks for getting this undone, as i really don't want to drill them out. cheers Andy

May 26th, 2010, 20:26	#2
ShadeTek Premier Member Last Online: Jun 17th, 2024 18:49 Join Date: Dec 2002 Location: Renfrewshire View Photos By: ShadeTek	Dremel a slot across the remains of the bolt and use a screwdriver to get it out. There are modified bolts to replace these as it is a known issue. Before taking the housing off, clamp the hose from the reservoir to the housing so it doesn't empty out over the engine. __________________ Tek-Emo Villis Emo Bis V70 SE NAV 1.6 D2 2015MY POWERSHIFT, D4162T, 93000miles, RED. /VOL FCR/PEPER OBD2/Acron 9135 OBD2/L.E.D Flasher/VDASH/ANCEL BA301/Topdon Top Scan

May 26th, 2010, 20:50	#4
ShadeTek Premier Member Last Online: Jun 17th, 2024 18:49 Join Date: Dec 2002 Location: Renfrewshire View Photos By: ShadeTek	Get the modified bolts from Volvo, then Dremel across the bolt head. __________________ Tek-Emo Villis Emo Bis V70 SE NAV 1.6 D2 2015MY POWERSHIFT, D4162T, 93000miles, RED. /VOL FCR/PEPER OBD2/Acron 9135 OBD2/L.E.D Flasher/VDASH/ANCEL BA301/Topdon Top Scan

May 26th, 2010, 22:21	#5
gdphillips ba baracus... Last Online: May 30th, 2023 12:30 Join Date: Dec 2008 Location: chichester west sussex	weld a nut on it.....tig arc ????????????spare if you mash it right up...... __________________ i aint getting on no plane.............

May 27th, 2010, 01:02	#6
georgem Member Last Online: Jun 30th, 2016 17:55 Join Date: Jan 2008 Location: Chorley	Insert the bit and then give it a couple of sharp hard raps with a hammer, always works for me. __________________ 850 2.5 b5252s 10 valve estate 1996

May 26th, 2010, 20:34	#3
EMM Senior Member Last Online: Jun 21st, 2024 16:15 Join Date: Jan 2010 Location: Cheltenham	Going to sound a bit stupid here, Dremel a slot across the bolt head? As i'm just worried that it's cause serious damaging and i'll have to replace more than just the housing bolts. Also will have to remove most of the injectors house etc? and where do i get the modified bolts from. Sorry to ask a load of questions but as it is my daily driver i really can't afford to mess it up. Cheers Andy

May 27th, 2010, 11:53	#7
SwedishInside Member Last Online: Feb 3rd, 2011 18:39 Join Date: May 2010 Location: Volvo City	I had this exact problem. I bought a brand new torx driver and tried to undo one bolt then suddenly... Crack!!! I thought I broke the bolt but luckily I broke the torx driver. lol. I gave up and handed my car over to Volvo (who made a wonderfully easy job of it). Lack of patience... (probably) Oh well.... Hope you get yours done... Somehow. __________________ Volvo 850 SE 1993 2.0ltr 143Bhp 5d Manual (Petrol)

May 27th, 2010, 14:06	#8
ratfink_v70_2000 Member Last Online: Jun 18th, 2024 19:12 Join Date: May 2009 Location: Bingley, West Yorkshire.	Hi, just done this last week. I sprayed wd40 on the bolt heads and thermostat housing 4 0r 5 times the day and night before I did it so it had a soak and then made sure I had good access to the bolt heads so that the bit was going in perfectly straight. When I did it next day it took 10 minutes. Hope you get yours sorted. Rich.

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