71904A1 Mercruiser Water Inlet Cover | Genuine Used Part
71904A1 Mercruiser Water Inlet Cover | Genuine Used Part
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🔧 Product Description
Genuine MerCruiser 3.7L Front Water Inlet Cover - Part Number: 71904A1
A genuine MerCruiser water-inlet and front water-pump impeller cover for selected 3.7-litre / 224 CID inline-four engines.
The cover closes the water-inlet section of the engine front cover and directs raw cooling water into the engine-mounted water pump.
⚙️ Key Features
- Genuine MerCruiser cooling-system cover
- Correct current part number 71904A1
- Supersedes original cover 71904
- Fits the MerCruiser 3.7L inline-four engine family
- Mounts to the engine front-cover water inlet
🚤 Compatibility
Commonly used on
- MerCruiser 3.7L engine-mounted raw-water pump assemblies
Typically suits
- Engine models:
- MerCruiser 470 2-barrel
- MerCruiser 470 MIE
- MerCruiser 485
- MerCruiser 488 / 488R
- MerCruiser 165 3.7L
- MerCruiser 170 3.7L
- MerCruiser 180 3.7L
- MerCruiser 190 3.7L
- MerCruiser 3.7L and 3.7LX
- HP Range: Approximately 165HP - 190HP
- Engine Type: MerCruiser 224 CID / 3.7L inline-four petrol engine
- Year Range: Approximately 1976-1989
🔌 Function
The cover forms part of the engine-mounted raw-water pump inlet. It seals the impeller chamber and directs incoming cooling water through the engine cooling system.
⚠️ Common Signs of Failure
- Cooling water leaks from the front cover
- Cover is corroded or pitted internally
- Gasket surface is warped
- Pump loses prime or delivers reduced water flow
- Mounting screws or threads are damaged
🔄 Supersession & Cross Reference
OEM Supersession Chain
- 71904A1 → Supersedes 71904
- 71904 earlier water-inlet cover reference
OEM / Related Numbers
- 71904A1
- 71904
- 745061173507
- Related front-cover water-pump impeller
- Related cover gasket and attaching hardware
Aftermarket / Verified Equivalents
- Specialist used or remanufactured 71904A1 cover
- No aftermarket equivalent
📦 Condition
- Genuine used part
- Removed from running engine where applicable
- In good working condition unless otherwise stated
Shipping & Delivery
Shipping & Delivery
Flat-rate shipping Australia-wide — $14.99 per order, no matter how many parts you add. Orders dispatch from our Kadina, South Australia store. Need it urgently or want to collect in person? Call us on 0412 532 984 before ordering.
Returns & Warranty
Returns & Warranty
14-day returns — if it's not right or you ordered the wrong part, tell us within 14 days of delivery and send it back in the condition you received it (return freight is at your cost; fitted parts can't be returned). Used parts are sale items, so a return may be limited to store credit. Full details in our Refunds & Returns policy.
What you get with this used part
What you get with this used part
- A genuine part removed from an engine, drive or jet ski dismantled in our Kadina workshop, inspected before listing. The photos show the actual part on our shelf.
- A 14-day return period if it is not right or you ordered the wrong part.
- Used gearboxes are pressure-tested before dispatch and carry a 30-day repair warranty. Propellers are sold as-is and priced accordingly.
- Not sure it fits? Send us your engine model and serial number or call 0412 532 984 and we will check before you buy.
Not sure this fits?
Not sure this fits?
Ask us before you buy — we check part numbers and fitment every day. Call 0412 532 984 (Mon–Fri 8.30am–4.30pm) or message us through the contact page with your engine or vehicle details.
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