Cylinder Head Gasket, Port Side – Fits Suzuki DF300 Series Outboards (Replaces 11142-98J10)
Cylinder Head Gasket, Port Side – Fits Suzuki DF300 Series Outboards (Replaces 11142-98J10) is backordered and will ship as soon as it is back in stock.
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Delivery and Shipping
Delivery and Shipping
Free standard shipping on all orders under 1 KG
Cylinder Head Gasket, Port Side – Fits Suzuki DF300 Series Outboard...
Product Details
This is a replacement Cylinder Head Gasket, Port Side – Fits Suzuki DF300 Series Outboards (Replaces 11142-98J10). It is designed specifically for the port side cylinder bank of Suzuki 4-Stroke 300 HP outboards, including the DF300AP (2012) and DF300T-Z (2007–2011) models.
This part is a direct replacement for Suzuki OEM part numbers 11142-98J00, 11142-98J01, and 11142-98J10.
- For installation on the port (left-hand) side cylinder bank only.
- Engine service requires replacing the corresponding starboard side gasket, which is sold separately.
- Engineered to provide a reliable seal for the engine's combustion chamber.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number | Superseded By | Notes |
|---|---|---|---|
| Suzuki | 11142-98J00 | 11142-98J01 | |
| Suzuki | 11142-98J01 | 11142-98J10 | |
| Suzuki | 11142-98J10 | Current part number |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
Fits select Suzuki DF300 series outboard engines.
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|---|
| Suzuki | DF300AP | 300 | 4-Stroke | 2012 | 11142-98J10 | Port side gasket |
| Suzuki | DF300T-Z | 300 | 4-Stroke | 2007–2011 | 11142-98J10 | Port side gasket |
Technical Specs
- Product Type
- Cylinder Head Gasket (Port Side)
- Installation
- Engine Service - Port Cylinder Bank
- Fuel Type
- Gasoline
- Dimensions
- 45.0 cm L x 27.5 cm W x 0.4 cm H
- Weight
- 0.45 kg (1 lb)
- Warranty
- 1-Year Warranty Against Manufacturing Defects
- Technical Note
- Port side bank gasket only. The starboard side gasket is sold separately (Suzuki P/N 11141-98J10).
What’s in the Box
- 1 x Cylinder Head Gasket, Port Side (11142-98J10)
Installation Notes
- Disconnect the vessel's battery and ensure the engine has completely cooled before beginning work.
- Drain the engine coolant and oil to prevent spills during disassembly.
- Remove the engine cover, intake manifold, camshafts, and any other components obstructing access to the cylinder head bolts.
- Carefully loosen and remove the cylinder head bolts in the sequence specified by the manufacturer's service manual.
- Lift the cylinder head off the engine block and remove the old gasket.
- Thoroughly clean both the cylinder block and head mating surfaces, removing all traces of old gasket material and carbon deposits.
- Position the new gasket correctly on the block, ensuring all passages align perfectly.
- Carefully place the cylinder head back onto the block and install the head bolts.
- Torque the head bolts to the manufacturer's specifications using a calibrated torque wrench, following the correct tightening pattern and stages.
- Reassemble all previously removed components in the reverse order of removal.
- Refill the engine with the correct type and amount of coolant and oil.
- Reconnect the battery, start the engine, and carefully inspect for any leaks (coolant, oil, or exhaust).
Troubleshooting & FAQ
Is this gasket for the port or starboard side?
This is the port side (left-hand) gasket only. The starboard side gasket, part number 11141-98J10, must be purchased separately to service both cylinder banks.
Do I need to use sealant with this gasket?
No. This cylinder head gasket is designed to be installed dry. Applying additional sealants can interfere with its ability to seal properly and may lead to premature failure. Always follow the installation guidelines in your engine's service manual.
What are the common signs of a failed head gasket?
Symptoms of a blown head gasket can include engine overheating, a noticeable loss of power or compression, milky or discolored engine oil (coolant contamination), or white smoke coming from the exhaust. A cylinder compression test is a reliable method for diagnosis.
How often should a head gasket be replaced?
A head gasket is not a routine maintenance item and is typically replaced only when it fails or during a major engine overhaul. Its lifespan depends on operating conditions, maintenance, and preventing engine overheating.
OEM vs. Aftermarket?
This listing is an aftermarket replacement (not OEM). Built to OEM-level specifications with comparable materials. Manufactured in an ISO 9002 facility, batch-inspected for consistency.
Shipping speed & cost?
We ship worldwide quickly—typical transit 5–15 days. Standard shipping is free; expedited options appear at checkout where available.
Warranty & returns?
Covered by a 1-year warranty against manufacturing defects under normal use. If issues arise, contact support with your order details. Returns are accepted within our standard window (unused & in original condition). See our policy page or reach out for instructions.
Safety & Important Info
- Verify images/specifications vs your original part. If anything differs—even if your model appears compatible—do not purchase.
- This is an aftermarket replacement, not an OEM component.
- Professional installation is recommended for safety and performance.
About Sea Sierra
- Pro-Grade Standards — We supply marine parts engineered to OEM-level tolerances and tested for real-world conditions.
- Fast Global Fulfillment — Free standard delivery to most regions in 5–15 days.
- Manufacturer-Direct Value — Fair pricing without compromising on materials or QC.
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