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Page 12
Rootes Manual WSM.143/144
General Data



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
"




WSM 143/144 Gd-1 Gd-2 Gd-3 Gd-4 Gd-5 Gd-6 Gd-7 Gd-8 Gd-9 Gd-10 Gd-11
General Data: Gd-12 Gd-13 Gd-14 Gd-15 Gd-16 Gd-17 Gd-18 Gd-19 Gd-20 Gd-21 Gd-22

 
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