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Crankcase & Fittings

Triumph Bonneville · Crankcase, Engine Covers, Lubrication System · 35 parts · 3 on the shelf in Brea

Exploded parts diagram — Crankcase & Fittings, Triumph Bonneville

Open this diagram in the interactive viewer → Click any callout on the drawing to jump to the part.

Triumph lists this drawing for the Bonneville, Bonneville Black Engine, Bonneville T100, Bonneville T100 EFI, Bonneville T100 A1, Bonneville T100 A2, Bonneville T100 50th Anniv, Bonneville T100 A2 McQueen, Bonneville T100 Black A2, Bonneville T100 1960 A2, Bonneville T100 A2 110th, Bonneville EFI, Bonneville Black Engine EFI, Bonneville SE A1, Bonneville A1, Bonneville SE A2, Bonneville A2, Bonneville SE2 A2, Bonneville A3, Bonneville Newchurch, Bonneville T100 A3, Bonneville T100 Black A3, Bonneville T100 SE, Bonneville T214 SE, Bonneville T100 Spirit. Triumph builds more than one machine in this book and they do not all take the same parts. Tell us which one you ride →

Motorcycles this catalogue covers

Bonneville T100
2008–2026
Bonneville T120
2016–2026
Bonneville T120 Black
2020–2026
Bonneville T100 Black
2017–2020

Our parts team checks fitment against your motorcycle before any order ships.

Every part on this diagram

1
T1160118
Crankcase Assy, Black
Qty 1
Bonneville SE > 436003 & Bonneville > 442346 **See Tech News 118**
Backordered at Triumph · we’ll confirm the ship date after you order
$339.31
On backorder Order through the parts desk
1
T1160143
Crankcase Assy, Black
Qty 1
Bonneville SE 436004 > & Bonneville 442347 > **See Tech News 118**
Backordered at Triumph · we’ll confirm the ship date after you order
$525.87
On backorder Order through the parts desk
2
T3000102
Dowel, Hollow, 10 x 14
Qty 4
Backordered at Triumph · expected Nov 20
$1.99
On backorder
3
T1160750
Main Bearing Shell, Grooved
Qty -1
White
$11.76
Available
3
T1160751
Main Bearing Shell, Grooved
Qty -1
Red
$11.76
Available
3
T1160752
Main Bearing Shell, Grooved
Qty -1
Blue
$11.76
Available
3
T1160753
Main Bearing Shell, Grooved
Qty -1
Green
$11.76
Available
4
T3000101
Dowel, Hollow, 8 x 14
Qty 2
$3.61
Available
5
T3700015
Cable Tie, 185.7 Long
Qty 1
$1.99
Available
6
T3450005
Plug, NPSI 3/8 Dryseal
Qty 4
If your engine number is 731974 or lower
$6.16
Available
6
T3450000
Plug, PTF-SAE Short, 3/8-18, Enc
Qty 4
If your engine number is 731975 or higher
Backordered at Triumph · we’ll confirm the ship date after you order
$6.16
On backorder
7
T2056859
Bush, S/Arm Pivot, 230M07
Qty 2
$13.26
Available
8
T1160665
Sightglass, Oil, Dia 20
Qty 1
$20.96
Available
9
T1261488
Oil Filler Plug, Chromed
Qty 1
$28.07
Available
10
T3600028
O Ring, Filler Cap
Qty 1
$1.99
Available
11
T1162010
Stud, Cylinder Head
Qty 8
$4.85
Available
12
T1169022
Barrels, 2 Cyl, Dia 90.0
Qty 1
If your engine number is 589887 or lower
$206.88
Available
12
T1169033
Barrels, 2 Cyl, Dia 90.0
Qty 1
If your engine number is 589888 or higher
$214.18
Available
13
T1161100
Tube, Air
Qty 1
$25.63
Available
14
T3600915
O Ring, ID 18 x 3
Qty 2
$2.73
Available
15
T1160127
Gasket, Base, 2 Cyl, Dia 90
Qty 1
$34.02
Available
16
T1161037
Gasket, Breather Plate
Qty 1
$2.64
Available
17
T3331044
Screw, Pan/Hd, Tx, M6 x 16, Slv
Qty 7
$1.99
In stock in Brea
18
T1160274
Spout
Qty 1
$10.63
Available
19
T1161036
Pipe, Breather Drain
Qty 1
Bonneville SE > 436003 & Bonneville > 442346 **See Tech News 118**
$11.08
Available
19
T1160137
Pipe, Breather Drain
Qty 1
Bonneville SE 436004 > & Bonneville 442347 > **See Tech News 118**
$11.26
Available
20
T3700440
Clip, Hose, 11-12.5mm
Qty 1
Bonneville SE > 436003 & Bonneville > 442346 **See Tech News 118**
$5.02
In stock in Brea
20
T3700030
Clip pipe
Qty 1
Bonneville SE 436004 > & Bonneville 442347 > **See Tech News 118**
$1.99
Available
21
T1161038
Hose, Breather Drain Extension
Qty 1
Bonneville SE > 436003 & Bonneville > 442346 **See Tech News 118**
$3.32
Available
21
T1160136
Hose, Breather Drain Extension
Qty 1
Bonneville SE 436004 > & Bonneville 442347 > **See Tech News 118**
$3.42
Available
22
T1161024
Plate, Upper, Breather
Qty 1
Backordered at Triumph · expected Nov 6
$41.72
On backorder
23
T1161025
Plate, Lower, Breather
Qty 1
Backordered at Triumph · we’ll confirm the ship date after you order
$5.35
On backorder Order through the parts desk
25
T1160209
Breather Drain Assy
Qty 1
Bonneville SE 436004 > & Bonneville 442347 > **See Tech News 118**
$47.51
Available
26
T3331044
Screw, Pan/Hd, Tx, M6 x 16, Slv
Qty 1
Bonneville SE > 436003 & Bonneville > 442346 **See Tech News 118**
$1.99
In stock in Brea
26
T3051063
Screw, Cap/Hd, M6 x 16, Enc, Raw
Qty 1
Bonneville SE 436004 > & Bonneville 442347 > **See Tech News 118**
$1.99
Available

Diagram and part data from Triumph’s own parts catalogue. Prices and availability are a dated snapshot, not a reservation. Fitment is Triumph’s data — send us the last six of your VIN if you want it checked before you order.

Southern California Motorcycles, 515 W Lambert Rd, Brea, CA 92821 · 714-256-6700

Triumph supply checked Oct 15, 2026.