Parts Catalog

Replacements
Home / Mercury / Mercury Marine [Updated: Apr. 10, 2026] / Outboard / 2 Stroke DFI (OptiMax) / 250 HP Pro XS 6 CYL (3.0L) / [1B426561 THRU 1B752546] - USA - Cat.# 90-898101403 / Cylinder Block and End Cap

Cylinder Block and End Cap

Parts (50)

#Part NumberDescriptionQtyStatus
- 841017A52 POWERHEAD ASSEMBLY 1
- 841220A03 GASKET SET Powerhead 1
1 9811T72 CYLINDER BLOCK ASSEMBLY 1
10 8245021   CONNECTOR 1
11 81893435   SCREW (M8 x 35) 14
12 82446180   SCREW (M10 x 80) 8
13 8248577   DEFLECTOR 6
14 82494810 SCREW (M6 x 10) 1
15 856774 WASHER (.406 x .750 x .105) Stainless Steel 10 superseded
16 4013610 NUT (M10) Stainless Steel 10
17 8283582 SENSOR 1 superseded
18 40011107 SCREW (M5 x 16) Stainless Steel 2
19 9787A4 END CAP ASSEMBLY 1
2 81893440   SCREW (M8 x 40) 4
20 62700   O-RING (3.237 x .103) 1
21 8308981   SEAL 2
22 82130020 SCREW (M6 x 20) 4
23 82130012 SCREW (M6 x 12) 1
24 421581 BUSHING 1
25 8215832 PIN Special (1.5 Inches) 1
26 841021A08 CYLINDER HEAD ASSEMBLY Starboard 1
26 841020A08 CYLINDER HEAD ASSEMBLY Port 1
27 818574   SEAL 2
28 884391   SEAL 6
29 891570050 SCREW (M8 x 50) 40 superseded
3 8569662   BRACKET 2 superseded
30 885599004 THERMOSTAT 54 Degree C/130 Degree F 2 superseded
31 8503181 GASKET 2
32 887601 COVER Thermostat (Port) 1 superseded
32 887602 COVER Thermostat (Starboard) 1 superseded
33 82130025 SCREW (M6 x 25) 4
34 328022 PLUG Pipe (.125-27) Brass 1
35 885342002 SENSOR ASSEMBLY 2 superseded
36 896699   O-RING (1.78 mm x .08 mm) 2
37 857186A1 PLATE ASSEMBLY 1 superseded
38 855729   MOUNT 3
39 82130145 SCREW (M10 x 45) 3
4 903509   STUD (M10 x 1.5 x 64) 4
40 19565002 GROMMET 1
41 855725 WASHER 6
42 65292 J CLIP 1 superseded
43 858424 CLAMP 1
44 29245 WASHER (.281 x .500 x .060) Stainless Steel 1 superseded
45 82130016 SCREW (M6 x 16) 2
46 858951 J CLIP 1
5 8154431   STUD (M10 x 1.5 x 155) 6
6 63779   PIN Dowel (.250 x .625) 4
7 8781051   CHECK VALVE 1
8 67296   PIN 3 superseded
9 43044   PIN Dowel - Without Hole (.375 x .625) 1