Dometic Seastar Front Mount Hydraulic Steering Ordering Guide for Outboard Engines
Dometic Seastar Front Mount Hydraulic Kits
Front mount cylinder part# HC5345-3 is included in the SeaStar outboard steering kits HK6400A-3/HK63XXA-3. If your engine requires the use of a cylinder other than the HC5345-3 (see application guide) you will need to purchase the individual components (helm, cylinder, hoses, etc.) separately.
SeaStar steering kit — SEASTAR-HK6400A-3
Includes: Cylinder (SEASTAR-HC5345-3), Helm (SEASTAR-HH5271-3), two quarts of SeaStar steering fluid (SEASTAR-HA5430[H]).
SeaStar steering kit — SEASTAR-HK63XXA-3
Includes: Hoses (SEASTAR-HO51XX), Cylinder (SEASTAR-HC5345-3), Helm (SEASTAR-HH5271-3), two quarts of SeaStar steering fluid (SEASTAR-HA5430[H]).
SeaStar steering kit – Classic tilt — SEASTAR-HK6400TC-3
Includes: Cylinder (SEASTAR-HC5345-3), Classic Tilt Helm (SEASTAR-HH6541-3), two quarts of SeaStar steering fluid (SEASTAR-HA5430[H]).
SeaStar steering kit – Sport tilt — SEASTAR-HK6400TS-3
Includes: Cylinder (SEASTAR-HC5345-3), Sport Tilt Helm (SEASTAR-HH6191-3), two quarts of SeaStar steering fluid (SEASTAR-HA5430[H]).
Front Mount Outboard Installation Recommendations
Outboard recommendations made in this section are based on our experience with typical installations, applications and usage. Ensure you select the system which provides the best comfort versus performance. It is the boat manufacturer and the installer’s responsibility to ensure the components selected are sufficiently validated on the boat for safe and acceptable operation. Do not use Dometic/SeaStar steering in applications it is not intended for.
For recommendations on the correct hydraulic steering cylinder for specific outboard engines, check our application guide.
| Engine | Normal Use Seastar Front Mount Cylinders |
Aggressive Use Seastar Tournament Series Cylinders |
| Single Engine | SINGLE CYLINDER 350 HP max. 75 MPH max. HC53XX-3 cylinder (see note 2) |
SINGLE CYLINDER 350 HP Max. HC63XX-3 PRO cylinder (See notes 2 & 3) or HC6845S |
| Dual Engine Non-Counter-Rotating | SINGLE CYLINDER 450 HP max. 55 MPH max. HC53XX-3 cylinder HO60XX tie bar |
SINGLE CYLINDER Tournament cylinders (see below) |
| DUAL CYLINDER Tournament cylinders (see below) HC53XX-3 Cylinders HO60XX tie bar |
DUAL CYLINDER Tournament cylinders (see below) |
|
| Dual Engine Counter Rotating | SINGLE CYLINDER 600 HP max. 55 MPH max. HC53XX-3 cylinder HO60XX tie bar |
SINGLE CYLINDER Tournament cylinders (see below) |
| DUAL CYLINDER 600 HP max. 55 MPH max. HC53XX-3 cylinder HO60XX tie bar |
DUAL CYLINDER Tournament cylinders (see below) |
|
| Triple Engine - One with Counter Rotating | DUAL CYLINDER Tournament cylinders (see below) 600 HP max. 55 MPH max. *MAX center engine drop <.75” |
DUAL CYLINDER Tournament cylinders (see below) |
| TRIPLE CYLINDER Tournament cylinders (see below) 900 HP max. 55 MPH max. *MAX center engine drop <.75” |
Consider Optimus EPS or 360 |
1. Dometic has specific steering equipment for boats that are driven aggressively, used in severe conditions or with more than 300 HP per engine.
2. ALL ENGINES over 300 HP and all boats that are driven aggressively must use a high strength tiller bolt, kit part # HA5822. All front mount cylinders built after June 15, 2007 will have this high strength bolt included in the box. High strength tiller bolts can be identified by the marking “DOMETIC ARP” on the head of the bolt.
3. HC63xx PRO Cylinders are designed for all those critical high speed, single outboard engine boats, such as Bass, Flats combo Race/Ski and other performance orientated boats capable of speeds in excess of 65 mph. For optimal performance, the use of SeaStar PRO helms and PRO Hoses are recommended.
Tournament Series Installation Recommendations
| Configuration | Cylinder | Hardware Kit | Tiebar | Notes | ||||
| Sku # | Qty | Sku # | Qty | Engine Center Distance inches (mm) | Sku # | Qty | ||
| Single Engine / Single Cylinder | HC6845* | 1 | HA6801 | 1 | N/A | N/A | N/A | 1 |
|
Twin Engine† / Single Cylinder (Starboard) |
HC6845* | 1 | HA6802 | 1 | 25.0 – 25.6 (635 – 650) 25.7 – 30.6 (653 – 777 ) 30.7 – 39.4 (780 – 1,001) 39.5 – 54.0 (1,003 – 1,372) |
HO6821 HO6822 HO6823 HO6824 |
1 1 1 1 |
1, 3, 4, 5 1, 3, 4, 5 1, 3, 4, 5 1, 3, 4, 5 |
| Twin Engine† / Dual Cylinder | HC6845* | 2 | HA6804 | 1 | 25.0 – 26.5 (635 – 673) 26.6 – 29.3 (676 – 744) 29.4 – 34.2 (747 – 869) 34.3 – 43.0 (871 – 1092) 43.5 – 58.0 (1,105 – 1,473) |
HO6820 HO6821 HO6822 HO6823 HO6824 |
1 1 1 1 1 |
1, 3, 4, 5 1, 3, 4, 5 1, 3, 4, 5 1, 3, 4, 5 1, 3, 4, 5 |
| Triple Engine† / Dual Cylinder | HC6845* | 2 | HA6806 | 1 | 25.0 – 27.9 (635 – 709) 28.0 – 36.0 (711 – 914) 36.0 – 51.0 (914 – 1,295) |
HO6822 HO6823 HO6824 |
2 2 2 |
1, 2, 3, 4, 5, 6 1, 2, 3, 4, 5, 6 1, 2, 3, 4, 5, 6 |
| Quad Engine† / Dual Cylinder | HC6845* | 2 | HA6811 | 1 | Consult Dometic technical service | 1, 2, 3, 4, 5 | ||
|
Quintuplet Engine |
Consult Dometic technical service | 1, 2, 3, 4, 5 | ||||||
1. Installation may vary according to the following factors: engine mounting height, transom thickness, use of transom savers, tiller bolt location, engine tilt range, and engine size.
2. For center engine drops greater than 3 inches (76 mm), please consult Dometic technical service.
3. Tie Bar length may vary depending on toe in/toe out setup. To allow for toe, add or subtract from your nominal engine center to center distance.
4. Based on recommended engine manufacturer minimum center to center distances. Deviating from these recommendations may require stroke limiting cylinders and/or engine tilt limiting, please consult Dometic technical service.
5. Cylinder’s must be plumbed in parallel only, no series connections. Only exception is if cylinders are utilizing a liquid tie bar.
6. Maximum drop: 3 inches (76 mm).
* HC6850 for Honda V6 or where stroke reduction is desired. Yamaha 3.3L engine requires one cylinder per engine.
† Mercury multi engine applications may require additional parts, contact Dometic technical support.
OXE 300 must use dual cylinder HC6850 for twin engine, no single cylinder option. For triple engine setup two HA6864 bolt kits must be used for center engine.
NOTICE! Required for triple engine installs on Mercury Optimax and PROxs and engines with a single tiller hole. May fit other applications, call Dometic technical support for more information.
| Configuration | Cylinder | Hardware Kit | Tiebar | Notes | ||||
| Sku # | Qty | Sku # | Qty | Engine Center Distance inches (mm) | Sku # | Qty | ||
| Triple Engine / Triple Cylinder | HC6845* | 3 | HA6807 | 1 | 28.0 – 28.8 (711 – 736) 28.9 – 30.5 (737 – 774) 30.6 – 33.3 (775 – 847) 33.4 – 38.3 (848 – 974) 38.4 – 47.0 (975 – 1,194) 47.1 – 62.1 (1,1 95 – 1,578) |
HO6819 HO6820 HO6821 HO6822 HO6823 HO6824 |
2 | 1, 2, 3, 4 1, 2, 3, 4 1, 2, 3, 4 1, 3, 4, 6 1, 3, 5, 6 1, 3, 7 |
1. Installation may vary according to the following factors: engine mounting height, transom thickness, use of transom savers, tiller bolt location, engine tilt range, and engine size.
2. Will require trim limiting at 0” (0 mm) drop.**
3. Tie Bar length may vary depending on toe in/toe out setup. To allow for toe, add or subtract from your nominal engine center to center distance.
4. Maximum drop 1.5” (38 mm) with trim limiting.**
5. Maximum drop 1.5” (38 mm) without trim limiting.
6. Maximum drop 3” (76 mm) with trim limiting.**
7. Maximum drop 3” (76 mm) without trim limiting.
* HC6850 for Honda V6 or where stroke reduction is desired.
** Trim limiting required as interference between the tie bar and support bracket will occur during independent trim/tilt
Sorry, is not an active item in our system. However, we may still be able to help you. Please email us at rajeshk@klizer.com or call us at (866)388-0390 for assistance. Please make sure to have the item number handy when you contact us.
