how to remove a crankshaft bolt rounded off

This is the Forum for all your Citroen Technical Questions, Problems or Advice.

Moderator: RichardW

Post Reply
User avatar
jsp
Posts: 327
Joined: 04 Dec 2014, 02:05
Location: Netherlands
My Cars: AX 3x 10E 1.4 GTI 5drs 1.0i
CX 2x GTI turbo
ID 19 1960

Now:
1960 ID 19
1984 CX GTI Turbo 1
1987 CX GTI Turbo 2
1987 AX 10E Pino
1994 AX 1.4 5dr TGS GTI
1994 AX 1.0 3dr Escapade
1996 AX 1.1 3dr spot Burgundy
1996 AX 1.1 5dr Verte
2003 peugeot 206 xs leather with auto A/C
x 12

how to remove a crankshaft bolt rounded off

Post by jsp »

How to remove a crankshaft bolt that is rounded off?

I am repairing another TU engine on an engine stand but, the crankshaft bolt wont come off.
Peter.N.
Moderating Team
Posts: 11563
Joined: 02 Apr 2005, 16:11
Location: Charmouth,Dorset
My Cars: Currently:

C5 X7 VTR + Satnav Hdi estate Silver
C5 X7 VTR + Hdi Estate 2008 Red

In the past: 3, CX td Safaris and about 7, XM td estates. Lovely cars.
x 1199

Re: how to remove a crankshaft bolt rounded off

Post by Peter.N. »

If you can find a socket that is slightly smaller than the bolt and hammer it on, that would be the easiest way, if that won't shift it weld a large nut onto the head of the bolt, not only will that give you more purchase but the heat will expand the bolt, hopefully loosening it.

Peter
User avatar
Paul-R
Donor 2023
Posts: 6916
Joined: 07 May 2009, 16:24
Location: Wirral, NW England; Vaucluse 84, France
Lexia Available: Yes
My Cars: 2015 1.6 Blue HDi 120 Peugeot 308 Active SW
2013 2.0 HDi 163 C5 Exclusive Tourer
2003 2.0 HDi 110 C5 Exclusive Estate (Gone)
2001 2.0 HDi 90 Xsara Estate (Gone)
x 1369

Re: how to remove a crankshaft bolt rounded off

Post by Paul-R »

If the socket is bi-hex (has 12 points) then a single hex socket might do the trick. preferably one that is a fraction smaller than the correct size - maybe an imperial of NF socket in place of the prescribed metric one.
As I get older I think a lot about the hereafter - I go into a room and then wonder what I'm here after.

Inside every old person is a young person wondering what the hell happened.

"Trying is the first step towards failure" ~ Homer J Simpson​
User avatar
DHallworth
Donor 2023
Posts: 2382
Joined: 20 Nov 2005, 17:05
Location: Glasgow
My Cars:
x 119

Re: how to remove a crankshaft bolt rounded off

Post by DHallworth »

The other option is a cold steel chisel and a hammer, hold it level with the bolt to mark it, then once it's cut a small groove in the edge, turn the chisel so it's almost at 90 degrees to the bolt and beat it with a lump hammer in the direction you'd be undoing the bolt in.

That method has saved me a load of times!

David.
'98 Xantia Activa V6 :-D
'00 XM V6 Exclusive
'09 C5 2.7 HDi Exclusive
‘10 C5 3.0 HDi Exclusive
'12 C6 3.0 HDi Exclusive
'15 C4 BlueHDi Feel
User avatar
Sloppysod
Donor 2024
Posts: 965
Joined: 23 May 2015, 23:35
Location: North Wales
My Cars: Citroens
1 x GS, 1 x GSX (Banger raced), 1 x GSA,
2 x CX Famililles, 1 x CX GTI,
BX, XM, Xantia, C5 Mk1,
C4 (Coupe), C4 (B7),
C5 (X7)

Renault
R4 Van
Fuego
Clio Campas
x 212

Re: how to remove a crankshaft bolt rounded off

Post by Sloppysod »

Question, I do not know this engine, but is this a lefthand threaded bolt? Are you trying to move it the right way?
Stu 🏴󠁧󠁢󠁷󠁬󠁳󠁿

"Some cause happiness wherever they go, others whenever they go"Oscar Wilde (1854-1900)

Major interventions
C5 Steering rack @ 58,000 mi
4 discs & Pads @ 63,585 mi
2 (AM6) oil exchanges @ 58,876 & 72,378 mi
Post Reply