1. Major Changes in D27DT Engine
(By Adaptation of Big Diameter Shaft)

2. 1. Major Changes in D27DT Engine (By Introduction of Big Diameter Shaft)
Part number
Part Name
Changes
Remark
Big Dia. Shaft
Small Dia. Shaft
Cylinder block(Short)
Increase the size and reinforce the main bearing wall.
Crankshaft
Increase the inner diameter of main bearing journal.
Connecting rod
Increase the size and adapt the fracture type connecting rod.
Viscous Damper
Adapt the viscous damper (bigger size).
Crankshaft sprocket
Increase the inner diameter due to use of bigger center bolt.
Crankshaft key
Increase the size (woodruff key)
Crankshaft front sealing
Increase the outer size of damper hub.
Crankshaft damper disc
Center bolt
Increase the size (M18  M20)
Main bearing cap
Thrust bearing cap
Main bearing upper shell
Increase the size.
Main bearing lower shell
Thrust bearing upper shell
Thrust bearing lower shell

3. Part number
Part name
Changes
Remark
Big Dia. Shaft
Small Dia. Shaft
Connecting rod bearing upper shell
Increase the size.
Connecting rod bearing lower shell
Main bearing cap bolt
Increase the length (67 → 82 mm).
Connecting rod bolt
Oil spray nozzle
Change the installation type(bolt → press­in)
Baffle plate
Change the space thickness due to lower installation height.
Baffle plate bolt
Alternator bracket
Compatible in both shafts (small and big diameter shaft).

4. D27DT Small Diameter Shaft D27DT Bbig Diameter Shaft
2. Detailed Changes in D27DT
1) Cylinder Block
D27DT Small Diameter Shaft
D27DT Bbig Diameter Shaft
▶ Part number :
▶ Inner dia. of main bearing cap housing : ∮ 62.5 mm
▶ Thickness of main bearing cap housing : 20 mm
▶ Location of “A” ID boss : Center of thrust bearing
▶ Part number :
▶ Inner dia. of main bearing cap housing : ∮ 66.5 mm
▶ Thickness of main bearing cap housing : 22 mm
▶ Location of “A”ID boss : 71 mm from center of thrust bearing
※ Reasons to be changed
▷ To accommodate the Increased combustion pressure and output.
▷ To improve the engine performance (increase the inner diameter)
▷ To make the manufacturing process easier (change the ID boss location)
"A"

5. D27DT Small Diameter shaft
3) Connecting rod
D27DT Small Diameter shaft
D27DT Big Diameter Shaft
▶ Part number :
▶ Inner diameter of small end : ∮ 30 mm
▶ Inner diameter of large end : ∮ 51.6 mm
▶ Pitch between small end and large end : 145 mm
▶ Part number :
▶ Inner diameter of large end : ∮ 54.6 mm
※ Reasons to be changed
▷ Due to change of crankshaft.
▷ To use the fracture type connecting rod.
※ Caution : · Make sure to align the connecting rods caps during installation.
· Mark cylinder number on each rod.

6. D27DT Small Diameter Shaft
4) Viscous Damper
D27DT Small Diameter Shaft
D27DT Big Diameter Shaft
▶ Part number :
▶ Inner diameter : ∮ 32 mm
▶ Inner diameter without bushing : ∮ 45 mm
▶ Total weight : 4.28 kg
▶ Part number :
▶ Inner diameter : ∮ 34 mm
▶ Inner diameter without bushing : ∮ 48 mm
▶ Total weight : 4.30 kg
※ Reasons to be changed
▷ Due to change of crankshaft.

7. D27DT Small Diameter Shaft
5) Crankshaft Sprocket
D27DT Small Diameter Shaft
D27DT Big Diameter Shaft
▶ Part number :
▶ Inner diameter : ∮ 32 mm
▶ Total length : 45 mm
▶ Part number :
▶ Inner diameter : ∮ 34 mm
▶ Total length : 43 mm
※ Reasons to be changed
▷ Due to change of crankshaft

8. D27DT Small Diameter Shaft
2) Crankshaft
D27DT Small Diameter Shaft
D27DT Big Diameter Shaft
▶ Part number :
▶ Inner diameter of crank journal : ∮ 58 mm
▶ Outer diameter of crank pin journal : ∮ 48 mm
▶ Width of crank pin : 28 mm
▶ Width of crank journal : 24 mm
▶ Part number :
▶ Inner diameter of crank journal : ∮ 62 mm
▶ Outer diameter of crank pin journal : ∮ 51 mm
▶ Width of crank pin : 26 mm
▶ Width of crank journal : 26 mm
※ Reasons to be changed
▷ To reinforce the crankshaft
▷ To increase the design safety of crankshaft
▷ Design changes according to new line in Changwon plant.
D27DT (emboss)
D27DTL/P (emboss)
Straight key
Woodruff key

9. D27DT Small Diameter Shaft
6) Crankshaft Key
D27DT Small Diameter Shaft
D27DT Big Diameter Shaft
▶ Part umber :
▶ Part number :
▶ Adaptation of woodruff key
※ Reasons to be changed
▷ Due to change of crankshaft
▷ To improve the assembly process and to increase the surface pressure.

10. D27DT Small Diameter Shaft
7) Crankshaft FRT Seal
D27DT Small Diameter Shaft
D27DT Big Diameter Shaft
▶ Part number :
▶ Inner diameter : ∮ 43.8 mm
▶ Outer diameter : ∮ 67 mm
▶ Part number :
▶ Inner diameter : ∮ 46.8 mm
※ Reasons to be changed
▷ Due to change of crankshaft
▷ To improve the assembly process and to increase the surface pressure.
Spring
Spring

11. D27DT Small Diameter Shaft
8) Crankshaft Vibration Damper Disc
D27DT Small Diameter Shaft
D27DT Big Diameter Shaft
▶ Part number :
▶ Inner diameter : ∮ 18.2 mm
▶ Outer diameter : ∮ 46 mm
▶ Part number :
▶ Inner diameter : ∮ 20.2 mm
▶ Outer diameter : ∮ 48 mm
※ Reasons to be changed
▷ Due to change of crankshaft and center bolt.

12. D27DT Small Diameter Shaft
9) Center Bolt
D27DT Small Diameter Shaft
D27DT Big Diameter Shaft
▶ Part number :
▶ Nominal size : M 18
▶ Length : 50 mm
▶ Tightening torque : 325Nm + 90˚
▶ Part number :
▶ Nominal size : M 20
▶ Length : 85 ㎜
▶ Tightening torque : 200Nm + 180˚
※ Reasons to be changed
▷ Due to change of crankshaft

13. D27DT Small Diameter Shaft
10) Main Bearing Cap
D27DT Small Diameter Shaft
D27DT Big Diameter Shaft
▶ Part number :
▶ Inner diameter of main bearing cap : ∮ 62.5 mm
▶ Thickness of main bearing cap : 20 mm
▶ Height : 48 mm
▶ Part number :
▶ Inner diameter of main bearing cap : ∮ 66.5 ㎜
▶ Thickness of main bearing cap : 22 ㎜
▶ Height : 55 ㎜
※ Reasons to be changed
▷ Due to change of crankshaft
▷ To improve the engine performance (increase the inner diameter).

14. D27DT Small Diameter Shaft
11) Thrust Bearing Cap
D27DT Small Diameter Shaft
D27DT big Diameter Shaft
▶ Part number :
▶ Inner diameter of main bearing cap : ∮ 62.5 mm
▶ Thickness of main bearing cap : 20 mm
▶ Height : 48 mm
▶ Part number :
▶ Inner diameter of main bearing cap : ∮ 66.5 mm
▶ Thickness of main bearing cap : 22 mm
▶ Height : 55 mm
※ Reasons to be changed
▷ Due to change of crankshaft
▷ To improve the engine performance (increase the inner diameter)

15. D27DT Small Diameter Shaft
12) Main Bearing
D27DT Small Diameter Shaft
D27DT Big Diameter Shaft
▶ Part number : upper
lower
▶ Inner diameter : ∮ 58 mm
▶ Outer diameter : ∮ 62.5 mm
▶ Bearing height : 17.5 mm
▶ Part number : upper
lower
▶ Inner diameter : ∮ 62 ㎜
▶ Outer diameter : ∮ 66.5 ㎜
▶ Bearing height : 19 ㎜
※ Reasons to be changed
▷ Due to change of crankshaft
▷ To secure a proper surface pressure in given conditions.
UPR
LWR
UPR
LWR

16. D27DT Small Diameter Shaft
13) Thrust Bearing
D27DT Small Diameter Shaft
D27DT Big Diameter Shaft
▶ Part number : upper
lower
▶ Inner diameter : ∮ 65.8 mm
▶ Outer diameter : ∮ 81 mm
▶ Part number : upper
lower
▶ Inner diameter : ∮ 69.8 mm
▶ Outer diameter : ∮ 83 mm
※ Reasons to be changed
▷ Due to change of crankshaft
▷ To secure a proper surface pressure in given conditions.
UPR
LWR
UPR
LWR

17. D27DT Small Diameter Shaft
14) Connecting rod Bearing
D27DT Small Diameter Shaft
D27DT big Diameter Shaft
▶ Part number : upper
lower
▶ Inner diameter : ∮ 48 mm
▶ Outer diameter : ∮ 51.6 mm
▶ Bearing height : 21.8 mm
▶ Part number : upper
lower
▶ Inner diameter : ∮ 51 mm
▶ Outer diameter : ∮ 54.6 mm
▶ Bearing height : 20 mm
※ Reasons to be changed
▷ Due to change of crankshaft
▷ To secure a proper surface pressure in given conditions.
UPR
UPR
Changed the location of upper locating lip due to adaptation of fracture type bearing.
LWR
LWR

18. D27DT Small Diameter Shaft
15) Main Bearing Cap Bolt
D27DT Small Diameter Shaft
D27DT Big Diameter Shaft
▶ Part number :
▶ Diameter : ∮ 13 mm
▶ Length : 67 mm
▶ Material : 37Cr4 or 41Cr4
▶ Tensile strength : 1040 ~ 1160 N/㎟
▶ Part number :
▶ Length : 82 mm
▶ Tensile strength : 1112 ~ 1267 N/㎟
※ Reasons to be changed
▷ To increase the length and to improve the strength due to adaptation of big diameter shaft.

19. D27DT Small Diameter Shaft
16) Oil Injection Nozzle
D27DT Small Diameter Shaft
D27DT Big Diameter Shaft
▶ Part number :
▶ Aluminum housing type
▶ Installed on crankcase with bolts
▶ Part number :
▶ Steel pipe type
▶ Pressed into crankcase
※ Reasons to be changed
▷ To secure the package to use the fracture type connecting rod.
▷ To reduce the cost.
▷ Auto press­in and inspection.