32-87108 Hose W/2 Fixed Flange Hoop for Mercruiser GM OMC 4.3L 5.0L 5.7L | JLM Marine

Circulation Pump Hose with Fixed Flange Hoop – Fits Mercruiser, GM, OMC 4.3L, 5.0L, 5.7L Engines

This circulation pump hose assembly is designed for use with Mercruiser, GM, and OMC marine engines, specifically the 4.3L, 5.0L, and 5.7L powerplants. Engineered to deliver reliable coolant flow and withstand harsh marine environments, this hose features two fixed flange hoops for secure, leak-free installation.

This part serves as a direct replacement for OEM part number 32-87108 (also referenced as 18-71337 in aftermarket listings), ensuring compatibility with factory mounting points and connections.

• Dimensions: 1-3/4" inner diameter, 12-3/4" tall for precise fitment
• Application: Circulation pump routing on specified V6 and V8 inboard/sterndrive engines
• Complete Assembly: Includes hose clamps as shown for ready installation

Part Number Cross-Reference

Use this table to confirm equivalent part numbers across OEM and aftermarket brands:

Compatible Engine Models

Confirm your engine model/year in the table below.

Technical Specifications

Package Contents

• 1 × Circulation Pump Hose with Fixed Flange Hoops
• Hose Clamps Assembly (as pictured)

Installation Guide

1. Drain the cooling system: Open the drain plugs and allow coolant to empty into a suitable container.
2. Remove old hose: Loosen existing hose clamps and carefully slide the worn hose off the pump and engine connections.
3. Inspect mating surfaces: Clean any debris or old gasket material from the flange mounting points.
4. Position new hose: Align the fixed flange hoops with the mounting holes on the circulation pump and engine block.
5. Install hose clamps: Slide the supplied clamps onto both ends of the hose before final seating.
6. Secure connections: Tighten clamps evenly to manufacturer torque specifications to prevent leaks.
7. Refill coolant: Use fresh marine-grade antifreeze/coolant mixture per your engine manual.
8. Bleed air from system: Run the engine briefly with the cap off (following OEM procedure) to purge trapped air.
9. Inspect for leaks: Check all connections under operating temperature and pressure. Retighten clamps if necessary.

Troubleshooting & FAQ

Q: How do I confirm this hose fits my specific engine model?
A: Verify that your engine is a Mercruiser, GM, or OMC 4.3L, 5.0L, or 5.7L and that your original hose matches the 1-3/4" ID and 12-3/4" tall dimensions. Cross-check the OEM part number 32-87108 against your engine's parts diagram.

Q: Will this hose work if my engine uses a different coolant routing configuration?
A: This hose is engineered for the standard circulation-pump configuration on the listed engines. If your setup has been modified or uses an aftermarket pump, confirm mounting-flange spacing before ordering.

Q: How often should I replace this circulation hose?
A: Inspect hoses annually for cracks, soft spots, or swelling. Replace every 3–5 years or sooner if you notice coolant seepage, reduced flow, or visible deterioration.

Q: What are the signs that this hose is failing?
A: Common indicators include coolant leaks around the flanges, engine overheating, visible cracking or bulging of the rubber, and loss of coolant level without external drips.

Q: OEM vs. Aftermarket?
A: This listing is an aftermarket replacement part (not an OEM component). We build to OEM specifications using comparable-grade materials. Production is done in an ISO9002-certified facility, and each batch is inspected for consistent performance.

Q: How fast do you ship and how much does it cost?
A: We offer fast global shipping—typically 5–15 days worldwide—and standard shipping is free. Expedited options are available at checkout depending on your location.

Q: What is your warranty and return policy?
A: This product includes a 1-year warranty against manufacturing defects under normal use. If something goes wrong, contact our support team with your order details. Returns are accepted within our standard return window (unused & in original condition); please see our policy page or reach out for instructions.

Important Notes

• Verify that the product images and specifications match your original part. If discrepancies exist—even if your model is listed—do not proceed with the purchase.
• This product is an aftermarket replacement part and is not an OEM component.
• Professional installation is recommended to ensure safety and optimal performance.

Why Choose JLM MARINE?

• Quality Assured: As a trusted manufacturer for over 20 years, we supply top marine brands globally.
• Fast Global Shipping: Free delivery worldwide in 5–15 days.
• Direct from Manufacturer: Competitive pricing without compromising quality.