Vauxhall Workshop Service and Repair Manuals > Omega B > J Engine and Engine Aggregates | Diesel Engine | Cylinder Block | Specifications | Crank Drive, Cylinder Block (25 DT, X 25 DT)

Torque guide values (25 DT, X 25 DT) > < Testing and Adjustment Values (25 DT, X 25 DT)

Crank Drive, Cylinder Block (25 DT, X 25 DT)

Illustration

1	Main Bearing Journals
2	Con-rod bearing journal
3	3 Main Bearing Journals (Guide Bearing)
4	Crankshaft colour code
5	Bearing shell colour code
6	Bearing shell identification

Object Number: 2399264 Size: DEFAULT

Engine			25 DT, X 25 DT
Crankshaft Dimensions			Ø Main bearing journals	Colour coding
			1 - 7
	Standard size	mm	59.971 - 59.976	white
		mm	59.977 - 59.983	green
		mm	59.984 - 59.990	yellow
	Undersize (0.25)	mm	59.721 - 59.726	white
		mm	59.727 - 59.733	green
		mm	59.734 - 59.740	yellow
	Undersize (0.50)	mm	59.471 - 59.476	white
		mm	59.477 - 59.483	green
		mm	59.484 - 59.490	yellow
			Ø Con-rod bearing journal
			1 - 6
	Standard size	mm	44.991 - 44.975	-
	Undersize (0.25)	mm	44.741 - 44.725	-
	Undersize (0.50)	mm	44.491 - 44.475	-
			Width main bearing
			journal 3
			(guide bearing)
	Standard size	mm	25.020 - 25.053	-
	Undersize (0.25)	mm	25.220 - 25.253	-
	Undersize (0.50)	mm	25.420 - 25.453	-

Engine			25 DT, X 25 DT
Crankshaft bearing			Lower crankshaft bearing shell
1, 2, 3, 4, 6			Colour	Thickness	Coding

	Standard size	mm	yellow, green white
		mm
	Undersize (0.25)	mm	yellow, green white
		mm
	Undersize (0.50)	mm	yellow, green white
		mm
			Upper crankshaft bearing shell
	Standard size	mm	yellow, green white
		mm
	Undersize (0.25)	mm	yellow, green white
		mm
	Undersize (0.50)	mm	yellow, green white
		mm
Permitted crankshaft bearing play		mm	0.020 - 0.058

Engine			25 DT, X 25 DT
Crankshaft bearing 5			Lower crankshaft bearing shell
(guide bearing)			Colour	Thickness	Coding

	Standard size	mm	yellow, green, white
		mm
	Undersize (0.25)	mm	yellow, green, white
		mm
	Undersize (0.50)	mm	yellow, green, white
		mm
			Upper crankshaft bearing shell
	Standard size	mm	yellow, green, white
		mm
	Undersize (0.25)	mm	yellow, green, white
		mm
	Undersize (0.50)	mm	yellow, green, white
		mm

Engine			25 DT, X 25 DT
Crankshaft bearing 5			Colour	Width	Coding
(guide bearing)
	Standard size	mm	yellow, green, white		-

	Undersize (0.25)	mm	yellow, green, white		-
	Undersize (0.50)	mm	yellow, green, white		-

Engine			25 DT, X 25 DT
Con-rod bearing			Lower con-rod bearing shell
			Colour	Thickness	Coding

	Standard size	mm			-
	Undersize (0.25)	mm			-
	Undersize (0.50)	mm			-
			Upper con-rod bearing shell
	Standard size	mm
	Undersize (0.25)	mm
	Undersize (0.50)	mm
Permitted con-rod bearing play		mm	0.020 - 0.055

Illustration

1	Cylinder bore
2	Double bevelled ring with spiral-type expander, chromed
3	Tapered compression ring with
	inner phase
4	Double traepzoidal ring 15°
5	Piston
	diameter

Object Number: 2399746 Size: DEFAULT

Engine			25 DT, X 25 DT
Ø Cylinder bore
	Standard size	mm	80.000 - 80.014
	Intermediate size	mm	80.080 - 80.094
	1st oversize	mm	80.250 - 80.264
Ø Piston
	Standard size	mm	79.951 - 79.969
	Intermediate size	mm	80.031 - 80.049
	1st oversize	mm	80.201 - 80.219
Piston clearance		mm	0.031 - 0.063
Piston projection		mm	0.54 - 0.99

Engine			25 DT, X 25 DT
Piston projection			Thickness of the	Coding for the
			cylinder head gasket	cylinder head gasket
Measurement
	0.54 - 0.99 mm.	mm	1.87	3 holes

Engine				25 DT, X 25 DT
Piston rings
	Double trapezoidal ring
		Height	mm	3.00
		Gap	mm	0.20 - 0.40
		Vertical play	mm	no measurement required
	Tapered compression ring
		Height	mm	1.75
		Gap	mm	0.20 - 0.40
		Vertical play	mm	0.040 - 0.088
	Double bevelled ring with spiral-type expander
		Height	mm	3.00
		Gap	mm	0.20 - 0.40
		Vertical play	mm	0.050 - 0.065
Ring gap distribution 1)			°	120

Engine				25 DT, X 25 DT
Piston pin
	Length		mm	63
	Diameter		mm	27
	Bearing			floating
	Clearance
		in piston	mm
		in con-rod	mm	0.008 - 0.015

1 ) The piston ring gap of the channel oil ring must be offset 180° relative to the opening of the inner spiral-type expander.

Related Literature Units
-
-

J Engine and Engine Aggregates
Diesel Engine
Cylinder Block
Specifications
Crank Drive, Cylinder Block (25 DT, X 25 DT)

Torque guide values (25 DT, X 25 DT) > < Testing and Adjustment Values (25 DT, X 25 DT)