Land Rover Defender 90 110 Workshop Book 2 Rover

2.25 LITRE PETROL AND DIESEL ENGINE 112 
REMOVE  THE CONNECTING-RODS  AND PISTONS  REMOVE,  INSPECT AND OVERHAUL 
CRANKSHAFT 
- During the following  instructions  it is  important  that all 
components  are kept 
in related  sets and the pistons  arc 
identified  with their  respective  bores. 
1. Turn the crankshaft to bring  the connecting-rod 
caps 
to an  accessible  position and remove  each cap 
and  lower  shell in turn.  Note that the connecting
- 
rod caps  are numbered  one to four. 
1. Remove...

1121 2.25 LITRE PETROL  AND DIESEL  ENGINE 
Inspect crankshaft 
3. Degrease the crankshaft  and clear  out the oil ways, 
which  can become  clogged  after long service. 
4.  Examine  visually, the crankpins  and  main bearing 
journals,  for obvious  wear, scores,  grooves  and 
overheating. 
A decision  at this  stage  should  be 
made  as  to whether 
the condition  of the  shaft  is 
worth  continuing  with more  detailed  examination. 
5.  With  a  micrometer,  measure and note  the ovality 
and...

2.25 LITRE PETROL AND DIESEL ENGINE 
t ., .I....:? .._. _._.. If the  above  figures  are exceeded the cylinders 
must  be rebored  or sleeved  depending  upon 
the 
general condition of the bores  and amount  of wear. 
Alternatively,  if the  overall  wear, taper and ovality 
are  well  within  the acceptable  limits and the 
original  pistons are serviceable  new piston  rings 
may  be fitted.  It 
is important  however, that the 
bores  are deglazed,  with 
a hone, to give a cross- 
hatched finish to...

2.25 LITRE PETROL  AND DIESEL  ENGINE 
NOTE: The two centre  and rear  bearings  are of the 
same  width,  whereas  the front  bearing  is wider  and 
has  an additional  oil feed  hole. 
Also ensure  that 
before  fitting the bearings  the oil passages  leading to 
the  bearings 
are free of sludge  and dirt. 
3. Position  the cylinder  block vertically,  rear face 
down. 
4.  Place  a new  bearing  into the front  camshaft 
chamber  and position  it 
so that it is above  the 
second  bearing  housing,...

2.25 LITRE PETROL AND DIESEL ENGINE 112 
19. The hexagon-headed  plugs at the  rear of the block 
should  have new washers  fitted, and their  threads 
coated  with a suitable  jointing compound. 
20. Thoroughly  clean the cylinder  block preferably 
using an airline to remove all traces of metal 
cut t ings . 
Check  crankcase  main bearings 
21. Discard scorcd, pitted,  cracked  and worn bearing 
shells. 
22. To determine  the maximum  wear, assemble  the 
main  bearing  shells and caps  to the...

lcl 2.25 LITRE PETROL  AND DIESEL  ENGINE 
3. New Pistons - Original  pistons fitted to new 
engines  at the  factory  are specially  graded to 
facilitate  assembly.  The grade  letter 
on the piston 
crown  should  be ignored 
when ordering  new 
pistons.  Genuine  Land Rover  service  standard  size 
pistons  are supplied  0,025 
mm (0.001 in) oversize 
to  allow  for production  tolerances 
on new engines. 
When  fitting new pistons  to a standard  size cylinder 
block  the bores  must be honed  to...

2.25 LITRE PETROL  AND DIESEL  ENGINE 
- Check piston ring side clearance 
Petrol  engine  pistons  have two compression  rings and 
one  oil control  ring assembly.  The diesel  engine  has 
three  compression  rings and one 
oil control  ring 
assembly. 
The method of checking  clearances  are the 
same for both  engines  but the clearances  are different. 
It is important  that clearances  are correct.  Rings that 
are 
too tight  will bind  when  hot, imparing  the radial 
pressure  causing possible...

2.25 LITRE PETROL AND DIESEL  ENGINE 
18. . 
19. 
20. 
21. 
ST716M 
Use an accurate connecting-rod  alignment  gauge to 
theck the rods  for  bend  and  twist. The maximum 
allowable  for  both  conditions  must 
not exceed 
0,127 
mm (0.005  ins). 
Examine  and check 
the small-end bush  for wear.  If 
necessary  renew the bush.  The correct clearance 
of 
the gudgeon  pin in the small-end  bush  is given in 
“General  specification  data”. 
When  renewing  a bush  ensure  that the oil hole 
in 
the...

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. . .- 
... 
. 
.I’. .. , .:.. ... .... .. 
2.25 LITRE  PETROL AND DIESEL  ENGINE E[ 
Assemble  pistons to connecting-rods 
27. Petrol engine  pistons  can be fitted  either  way 
round,  except  those that  are being  refitted  to their 
original  bores 
in which  case  they must  be fitted  to 
the  connecting
-rod  in the  same  position  in 
accordance  with the mark made  during removal. 
28. Inscrt a circlip in one side...

2.25 LITRE PETROL AND DIESEL ENGINE ~~  ~~ 
3. Locate 
the crankshaft  in position  on the  upper 5. Place  the crankshaft in position  in the  crankcase eL? 
bearing  halves in the  crankcase  and wipe  any oil 
from  the journals  since ‘Plastigauge’  is soluble  in 
oil.  Place  a piece  of ‘Plastigauge’  across the lower 
half  of each  crankshaft  journal or lower  bearing 
cap  shell. 
Fit the cap  and  tighten to the correct 
torque.  Remove  the cap  and  bearing  and using  the 
scale  supplied...