Group 21 Reconditioning engine
Specifications
Note!
When replacing valve seats: the interference between
the valve seat and its bore in the cylinder head must be
0.070-0.134
mm, (0.0027-0.0052 in), i.e. the valve seat diame-
ter must be 0.070-0.134 mm greater than the diameter of the
bore in the cylinder head.
Valve seats are available in three oversizes.
Valve guides
mm
(in)
Length 50.1-51.3 (1.2725-1.3030)
Inner
diameter
8.000-8.022
(0.3149-0.3158)
Press-in measurement to cylinder head contact surface against
block:
intake 39.5-40.5 (1.5551-1.5944)
exhaust 36.9-37.9 (1.4527-1.4921)
Valve guides are available in three oversizes, and are marked
with grooves.
Standard
Oversize 1
2
3
Marking
No groove
1 groove
2 grooves
3 grooves
Reamer for seat
5166
5167
5168
/"*
Valve
springs
Two types of valve springs are in use. The springs are colour coded
as follows:
Grey springs:
B27A
1976-1979
B27E
1975-1978
1979-1980
Sweden + Australia
B27F
1976-1979
Green springs:
B28A
1980-1982
B 27 E
1979-1980
(excluding Sweden, Australia)
B28E
B28F
1981-1982
1980-1982
Grey springs:
Length
mm
47.2
40.0
32.2
in
1.86
1.57
1.27
Load
N(kp)
0
233-268
(23.3-26.8)
521-585
(52.1-58.5)
lbs.
0
52-60
116-131
Green springs:
Length
mm
47.1
40.0
30.0
in
1.85
1.57
1.18
Load
N(kp)
0
23.0-26.6
613-689
(61.3-68.9)
lbs.
0
51-59
137-154
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