| CYLINDER BLOCK |
'260'
|
'289"
|
| Material |
Cast Iron |
As '260'
|
| Max. oversize (bore) |
.060 in. (1.52 mm.) |
0.040 in. (1.01 mm.)
|
| Dia. main bearing bore - |
|
As '260'
|
| - Red |
(2.4412/2.4416 in. (62.00/62.01mm.) |
"
|
| - Blue |
2.4416/2.4420 in. (62.01/62.02 mm.) |
"
|
| CYLINDER HEAD |
(for torque loading figures see table at end of section) |
|
| Material |
Cast iron |
"
|
| Combustion chamber volume |
53/56 c.c.
|
52/55 cc.
|
| Angle of valve seats |
45 deg.
|
As '260'
|
| Valve guides |
Integral with head See Section B |
"
|
| Gaskets - Type |
Steel - Asbestos |
"
|
| VALVES |
|
"
|
| Position and operation |
Overhead, push rods and rockers |
"
|
| Valve clearance |
.082/.152 in. (2.08/3.86 mm.) (with the hydraulic valve lifter collapsed |
- see Section B) Clearance is at the valve stem tip
|
| Valve lifter leak down rate |
10/100 seconds 5/50 seconds (measured at 0.0625 in. plunger travel
|
As '260'
|
| Timing |
|
|
| -Inlet opens |
21 deg. B.T.D.C. |
16 deg. B.T.D.C. |
| -Inlet closes |
51 deg. A.B.D.C. |
70 deg. A.B.D.C. |
| -Exhaust opens |
57 deg. B.B.D.C. |
52 deg. B.B.D.C. |
| -Exhaust closes |
15 deg. A.T.D.C. |
24 deg. A.T.D.C. |
| Head diameter-Inlet |
1.662/1.677 in. (42.21/42.59 mm.) |
As '260'
|
| -Exhaust |
1.381/1.396 in. (35.07/35.45 mm.) |
1.442/1.457 in. (36.63/37.01 mm.) |
| Stem diameter-Inlet |
.3416/.3423 in. (8.67/8.69 mm.) |
As '260'
|
| -Exhaust |
.3406/.3413 in. (8.65/8.66 mm. |
"
|
| Angle of valve faces |
44 deg. |
"
|
| Stem clearance in guide - Inlet |
.0008/.0025 in. (.02/.06 mm.) |
"
|
| - Exhaust |
.0018/.0035 in (.04/.08 mm.) |
"
|
| Valve length (Inlet and exhaust) |
4.860 in. |
(12.34 mm.) |
| Valve spring - Type |
|
|
| -Retention |
Single Cup and split cotters |
As '260'
|
| -Free length |
2.15 in. (54.6 mm.) |
(2.09 in. (53.08 mm.) |
| -Fitted length |
1.75/1.78 in. (44.4/45.2 mm.) |
.1.75/1.78 in. (44.4/45.2 mm.) |
| -Load fitted |
57/63 lbs. @1.77 in (25.8/28.5kg.) |
71/79 lb. (32.2/35.8 kg.). |
| TIMING CHAIN |
|
|
| Pitch |
.375 in (9.5 mm.) x 58 links |
As '260'
|
| Width |
.75 in (19 mm.) nominal |
"
|
| Lubrication |
Splash |
"
|
**
