1994-2000 Citroen XM 4 Door ENGINE -> Cylinder head: marking and tightening User Manual
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ENGINE -> Cylinder head: marking and tightening for Your Citroen XM 4 Door Second Generation (1994-2000)

CYLINDER HEAD  
XANTIA - XM  
Engines : BFZ – BFX - LFX - LFY - RGX - RFV  
IDENTIFICATION OF THE CYLINDER HEAD GASKET  
Engine types  
BFZ  
BFX  
LFX  
LFY  
RGX  
RFV  
Identification marks  
(Notch on cylinder head gasket)  
*
1
A
B
C
D
E
A
B
C
D
E
0
0
0
0
0
1
0
0
0
CURTY  
Suppliers  
0
0
1
0
0
0
0
0
0
1
1
0
1
0
0
MEILLOR  
0 = Without notch  
*
1 = One notch  
B1BP004C  
51  
 
XANTIA - XM  
CYLINDER HEAD (continued)  
Engines : BFZ – BFX - LFX - LFY - RGX - RFV  
Cylinder head tightening (m.daN)  
BFZ – BFX - LFX – LFY  
Cylinder head bolts  
- Pre-tightening  
- Loosening  
6
YES  
2
- Tightening  
Note : Oil the threads  
- Angular tightening  
300°  
and under the heads of  
the cylinder head bolts.  
(Use engine oil or  
Molykote G Rapid Plus).  
RGX – RFV  
- Pre-tightening  
- Loosening  
3.5  
NO  
7
B1DP13PC  
- Tightening  
X = MAXIMUM reusable length  
- Angular tightening  
160°  
BFZ - BFX  
LFX  
LFY  
RGX  
RFV  
171.5 mm  
160.5 mm  
122 mm  
112 mm  
B1DP05BC  
52  
 
CYLINDER HEAD  
SYNERGIE  
Engine : RFN  
Identification of the cylinder head gasket  
Nominal dimension  
4 - 5  
Repair dimension  
2 - 4 - 5  
Marking zone  
"d"  
Marking zone  
"e"  
R1  
R2  
1.4  
Gasket thickness  
(mm)  
0.8  
1.1  
Supplier  
MEILLOR  
Multilayer metallic gasket  
B1DP183D  
53  
 
CYLINDER HEAD (continued)  
SYNERGIE  
Engine : RFN  
Cylinder head tightening (m.daN)  
Cylinder head bolts  
RFN  
Pre-tightening  
1.5 ± 0.1  
5 ± 0.1  
Tightening  
Loosening  
Tightening  
360° ± 2°  
2 ± 0.75  
Angular tightening 285° ± 5°  
B1DP16FC  
A = Washer thickness : 4 ± 0.2 mm.  
Note : Oil the threads and  
under the heads of the cylinder  
head bolts. (Use engine oil or  
Molykote G Rapid Plus).  
X = Length under heads of new bolts = 144.5 ± 0.5 mm.  
X = MAXIMUM reusable length  
RFN  
B1DP05BC  
X = 147 mm  
54  
 
CYLINDER HEAD  
XANTIA - XM  
Engine : XFZ  
IDENTIFICATION OF THE CYLINDER HEAD GASKET  
Thickness  
(mm)  
Ident. marks  
(1) and (2)  
Supplier  
ERLING  
Front  
1.45 ± 0.04  
Centre tab  
Rear  
B1DP09TC  
55  
 
XANTIA - XM  
CYLINDER HEAD (continued)  
Engine : XFZ  
Cylinder head tightening (m.daN)  
Cylinder head bolt  
- Pre-tighten  
- Loosen  
2
Front  
YES  
1.5  
- Tightening  
- Angular tightening 225°  
Note : Oil the threads and under the  
heads of the cylinder head bolts.  
(Use engine oil or Molykote G Rapid  
Plus).  
Rear  
X = MAXIMUM reusable length  
XFZ  
149.5 mm  
B1DP09UC B1DP09VC  
56  
 
XANTIA  
CYLINDER HEAD  
Engine : DHX  
IDENTIFICATION OF THE CYLINDER HEAD GASKET  
DHX  
Thickness  
(mm)  
± 0.06  
Piston  
stand-proud (mm)  
Marking  
(B)  
Engine type  
0.56 to 0.67  
0.68 to 0.71  
0.72 to 0.75  
0.76 to 0.79  
0.80 to 0.83  
1.36  
1.40  
1.44  
1.48  
1.52  
DHX  
(A) = Engine identification.  
(B) = Thickness identification.  
Engine  
DHX  
Ident. (A)  
Ident. (B)  
1 to 5 notches  
3 notches  
B1BP10TC  
57  
 
XM  
CYLINDER HEAD (continued)  
Engine : P8C  
IDENTIFICATION OF THE CYLINDER HEAD GASKET  
Piston stand-proud  
(mm)  
Thickness  
(mm)  
Position of  
hole(s)  
Engine type  
Ident.  
0.65 to 0.76  
0.77 to 0.81  
0.82 to 0.86  
0.87 to 0.91  
0.92 to 0.96  
Reconditioning  
1.52  
1.57  
1.62  
1.67  
1.72  
B - A1  
B - A2  
B - A3  
(A) and (B)  
P8C  
B - A4  
B - A5  
B - A1 - A5  
B1BP1DTC  
58  
 
XANTIA - SYNERGIE  
CYLINDER HEAD  
Engine : RHZ - RHY  
IDENTIFICATION OF THE CYLINDER HEAD GASKET  
Engine  
type  
Piston stand-  
proud (mm)  
Thickness  
(mm)  
No. of notches  
at A  
0.47 to 0.605  
0.605 to 0.655  
0.655 to 0.705  
0.705 to 0.755  
0.755 to 0.83  
1.30 ± 0.06  
1.35 ± 0.06  
1.40 ± 0.06  
1.45 ± 0.06  
1.50 ± 0.06  
1
2
3
4
5
RHZ  
RHY  
B1DP15AD  
59  
 
XANTIA - XM - SYNERGIE  
CYLINDER HEAD  
Engines : DHX - RHZ - RHY - P8C  
Cylinder head tightening (m.daN)  
Cylinder head bolts  
DHX - P8C  
RHZ - RHY  
P8C  
- Pre-tightening  
- Tightening  
2
6
- Angular tightening  
180°  
DHX - RHZ - RHY  
- Pre-tightening  
- Tightening  
2
6
- Angular tightening  
220°  
Note : Oil the threads and under the heads of the cylinder  
head bolts. (Use engine oil or Molykote G Rapid Plus).  
X = MAXIMUM reusable length  
DHX  
P8C  
RHZ - RHY  
133.3 mm  
150.5 mm  
151.5 mm  
B1DP05BC  
B1DP13PC B1DP15EC  
60  
 
XM  
CYLINDER HEAD  
Engine : THY  
Cylinder head tightening ( m.daN)  
Cylinder head bolts  
Identification of the cylinder head gasket  
Thickness  
Engine type  
Ident.  
Pre-tightening the bolts :  
(mm)  
- 1 à 14  
(Bolt Ø 12)  
(Bolt Ø 10)  
5
THY  
1.6  
None  
- 15 à 22  
3.5  
Angular tightening :  
- 1 à 22  
(Bolt Ø 12 and 10) 120° ± 5°  
Note : Oil the threads and under  
the heads of the cylinder head  
bolts. (Use engine oil or  
Molykote G Rapid Plus).  
B1DP15EC  
X = MAXIMUM reusable length  
Bolt Ø 12  
153.5 mm  
Bolt Ø 10  
162.5 mm  
B1DP03XC  
61  
 

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