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Wiring diagrams Section: DOHC Petrol Engine

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Crank Drive, Cylinder Block Opel Combo C

DOHC Petrol Engine 2 illustrations ~141 words

Illustration: Z 12 Xe

Crank Drive, Cylinder Block

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

Crank Drive, Cylinder Block (Continued)

Engine			Z 12 XE, Z 12 XEP, Z 14 XEP
Crankshaft dimensions			Ø Main bearing journal	Colour code
			1 – 5
	Standard size	mm	50,0040 - 50,0105	green
		mm	50,0105 - 50,0170	brown
	Undersize (0.25)	mm	49,7540 - 49,7605	green / blue
		mm	49,7605 - 49,7670	brown / blue
	Undersize (0.50)	mm	49,5040 - 49,5105	green / white
		mm	49,5105 - 49,5170	brown / white
			Ø Con-rod bearing journal
			1 – 4
	Standard size	mm	42,971 -42,987	-
	Undersize (0.25)	mm	42.721 – 42.737	blue
	Undersize (0.50)	mm	42.471 – 42.487	white
			Wide main bearing –
			journal 4
			(guide bearing)
	Standard size	mm	23,000 - 23,052	-
	Undersize (0.20)	mm	23,200 - 23,252	-
	Undersize (0.40)	mm	23,400 - 23,452	-

Engine			Z 12 XE, Z 12 XEP, Z 14 XEP
Crankshaft bearing			Lower crankshaft bearing shell
1,2,3,5			Colour code	Thickness	Code
					GM 985.1
	Standard size	mm	brown	1,989 - 1,995	328 N
		mm	green	1,995 - 2,001	329 N
	Undersize (0.25)	mm	brown / blue	2,114 - 2,120	330 A
		mm	green / blue	2,120 - 2,126	331 A
	Undersize (0.50)	mm	brown / white	2,239 - 2,245	332 B
		mm	green / white	2,245 - 2,251	333 B
			Upper crankshaft bearing shell
	Standard size	mm	brown	1,989 - 1,995	328 N
		mm	green	1,995 - 2,001	329 N
	Undersize (0.25)	mm	brown / blue	2,114 - 2,120	330 A
		mm	green / blue	2,120 - 2,126	331 A
	Undersize (0.50)	mm	brown / white	2,239 - 2,245	332 B
		mm	green / white	2,245 - 2,251	333 B
Perm. crankshaft bearing clearance		mm	0,007 - 0,036

Engine			Z 12 XE, Z 12 XEP, Z 14 XEP
Crankshaft bearing 4			Lower crankshaft bearing shell
(guide bearing)			Colour	Thickness	Coding
			Coding		#
					GM 985,1
	Standard size	mm	brown	1,989 - 1,995	337 N
		mm	green	1,995 - 2,001	338 N
	Undersize (0.25)	mm	brown / blue	2,114 - 2,120	339 A
		mm	green / blue	2,120 - 2,126	340 A
	Undersize (0.50)	mm	brown / white	2,239 - 2,245	341 B
		mm	green / white	2,245 - 2,251	342 B
			Upper crankshaft bearing shell
	Standard size	mm	brown	1,989 - 1,995	337 N
		mm	green	1,995 - 2,001	338 N
	Undersize (0.25)	mm	brown / blue	2,114 - 2,120	339 A
		mm	green / blue	2,120 - 2,126	340 A
	Undersize (0.50)	mm	brown / white	2,239 - 2,245	341 B
		mm	green / white	2,245 - 2,251	342 B

Engine			Z 12 XE, Z 12 XEP, Z 14 XEP
Crankshaft bearing 4			Colour code	Width	Code
(guide bearing)
	Standard size	mm	green – brown	22.850 - 22.900	-
	Undersize (0.25)	mm	brown / blue	23.050 - 23.100	-
			green / blue
	Undersize (0.50)	mm	brown / white	23.250 - 23.300	-
			green / white

Engine			Z 12 XE, Z 12 XEP, Z 14 XEP
Con-rod bearing			Lower con-rod bearing shell
			Colour	Thickness	Coding
			Coding		#
					GM 985.3
	Standard size	mm	-	1,490 - 1,500	352 N
	Undersize (0.25)	mm	blue	1,615 - 1,625	353 A
	Undersize (0.50)	mm	white	1,740 - 1,750	354 B
			Upper con-rod bearing shell
	Standard size	mm	-	1,490 - 1,500	352 N
	Undersize (0.25)	mm	blue	1,615 - 1,625	353 A
	Undersize (0.50)	mm	white	1,740 - 1,750	354 B
Perm. con-rod play		mm	0,013 - 0,065

Crank Drive, Cylinder Block (Continued)

Illustration

Crank Drive, Cylinder Block

1. Index – identification of cylinder bore
2. Cylinder bore
3. Double bevelled ring with spiral-type expander
4. Tapered compression ring or double trapezoidal ring
5. Rectangular compression ring
6. Piston diameter

Crank Drive, Cylinder Block (Continued)

Engine				Z 12 XE	Z 12 XEP, Z 14 XEP
Ø Cylinder bore
	Standard size
		Coefficient 99	mm	72.485 - 72.495	73,385 - 73,395
		Coefficient 00	mm	72.495 - 72.505	73,395 - 73,405
		Coefficient 01	mm	72.505 - 72.515	73,405 - 73,415
	Oversize 1)
		Index 9 + 0.5	mm	72,985 - 72,995	73,885 - 73,895
		Coefficient 0 + 0.5	mm	72,995 - 73,005	73,895 - 73,905
		Coefficient 1 + 0.5	mm	73,005 - 73,015	73,905 - 73,915
Ø Piston
	Standard size
		Coefficient 99	mm	72.465 - 72.475	73,345 - 73,355
		Coefficient 00	mm	72.475 - 72.485	73,355 - 73,365
		Coefficient 01	mm	72.485 - 72.495	73,365 - 73,375
	Oversize
		Index 9 + 0.5	mm	72.965 - 72.975	73,845 - 73,855
		Coefficient 0 + 0.5	mm	72,975 - 72,985	73,855 - 73,865
		Coefficient 1 + 0.5	mm	72,985 - 72,995	73,865 - 73,875
Piston clearance			mm	0.01 - 0.03	0.03 - 0.05
Piston projection			mm	-0,04	-0,55

Engine			Z 12 XE	Z 12 XEP, Z 14 XEP
Piston rings
			Rectangular compression ring
	Height	mm	1,175 - 1,19	1,17 - 1,19
	Gap	mm	0,15 - 0,35	0,30 - 0,45
	Vertical play	mm	0,040 - 0,075	0,04 - 0,08
			Tapered compression ring	Taper-faced compression ring
	Height	mm	1,475 - 1,490	1,17 - 1,19
	Gap	mm	0,25 - 0,45	0.30 - 0.50
	Vertical play	mm	0,030 - 0,065	0,030 - 0,070
			Oil scraper ring
	Height	mm	1,84 - 1,98
	Gap	mm	0,25 - 0,75
	Vertical play	mm	0,03 - 0,19
Ring gap distribution 2)		°	120

Engine				Z 12 XE, Z 12 XEP, Z 14 XEP
Piston pin
	Length		mm	50.6 - 51.4
	Diameter		mm	17,995 - 18,000
	Bearing			shrunk in con-rod
	Clearance
		in piston	mm	0,006 - 0,017
		in con-rod	mm	-0,032 - -0,015

1

) After re-boring, the old index must be invalidated and the new oversizing index must be embossed

2

) Arrange gap of upper oil scraper ring 25 to 50 mm offset to the left and gap of the lower ring 25 to 50 mm offset to the right relative to the gap of the lower intermediate ring.